CN104254296A - Head fixation system and method - Google Patents

Abstract

A head fixation system comprising: a platform; a retaining ring rotatably coupled to a ring mount extending from an upper surface of the platform, wherein the retaining ring includes a plurality of slots extending along a circumference of the retaining ring; a head support configured to be inserted into a first one of the plurality of slots in the retaining ring; a first fixation post having a first fixation pin that engages the skull of the patient, wherein the first fixation post is configured to be inserted into a second of the plurality of slots in the fixation ring; a second fixation post having a second fixation pin that engages the skull of the patient, wherein the second fixation post is configured to be inserted into a third groove of the plurality of grooves in the fixation ring; and an MRI coil including a top coil member and a bottom coil member movably mounted to a platform, wherein the MRI coil is rotatable relative to and independent of the stationary ring.

Description

Head fixation systems and methods

technical field

The present invention relates to a surgical work platform. More particularly, the present invention relates to head fixation systems and methods of use thereof that facilitate alignment of surgical and viewing instruments with a patient.

Background technique

In the United States, approximately 200,000 patients are diagnosed with brain tumors each year. Roughly 17,000 of these brain tumors are "benign," meaning that the tumor mass is not cancerous. However, the other approximately 183,000 of these brain tumors are "malignant" (ie, cancerous), meaning they cause or contribute to the patient's death. About 10% of cancerous brain tumors are "primary" tumors, which means the tumor originated in the brain. Primary tumors usually consist of brain tissue with mutated DNA that grows rapidly and replaces or replaces normal brain tissue. The most common primary tumor is considered to be a glioma, which portends a cancer of the glial cells of the brain. In most cases, primary tumors appear as single masses. Often, however, these monoliths may be large, irregular, multi-lobed, and/or infiltrate into surrounding brain tissue. Primary tumors are often not diagnosed until patients experience symptoms such as headaches, altered behavior, or sensory disturbances. However, by the time symptoms appear, the tumor may already be large and aggressive.

A well-known method of treating cancerous brain tumors is surgery. Specifically, surgery includes craniotomy (ie, removal of a portion of the skull), dissection, and total or partial tumor resection. The goals of surgery include removing or reducing the number of active malignant cells in the brain, and reducing pain or functional impairment caused by the action of the tumor on adjacent brain structures. However, by itself, surgery is invasive and risky. Also, surgery is often only partially effective for some tumors. In other tumors, surgery itself may not be feasible, it may risk injury to the patient, it may not be tolerated by the patient, and/or it may involve significant costs and rehabilitation.

Another well-known method of treating cancerous brain tumors is stereotaxic radiosurgery (SRS). In particular, SRS is a treatment in which multiple intersecting beams of radiation are directed at the tumor such that the intersection of these beams receives a lethal dose of radiation while leaving tissue in the path of either beam undamaged. SRS is noninvasive and is usually performed as an outpatient procedure. However, after several months of treatment, it is often not confirmed that the tumor has been killed or neutralized. Furthermore, in cases where high doses of radiation may be required to kill tumors, for example, in the presence of multiple or recurrent tumors, the "safe threshold" is often reached for patients before all tumors are killed. ", here, too much radiation is not advisable.

In recent years, methods of treating tumors by "heating" (also known as hyperthermia or hyperthermia) have emerged. In particular, it is well known that above 57°C, almost all living tissue is damaged or killed almost immediately and irreversibly by a procedure known as coagulation necrosis or amputation. Malignant tumors, due to their hypervascularization and mutated DNA, are more susceptible to heat-induced damage than normal tissues. Various energy sources can be used, such as laser, microwave, radio frequency, electricity, and ultrasonic sources. Depending on the application and technique, the heat source can be extracorporeal (ie, outside the body), extra-tissue (ie, outside the tumor) or intra-tissue (ie, inside the tumor).

Intra-tissue hyperthermia (ITT) is a treatment designed to heat and destroy tumors from within them. The advantage of this type of treatment is that energy is applied directly to the tumor without passing through the surrounding normal tissue. Another advantage of this type of treatment is that energy deposition is more likely to extend throughout the tumor.

An exemplary ITT procedure begins with the insertion of an optical fiber into a tumor with an element at its "insertion" end that redirects laser light from an external source in a direction approximately at right angles to the length of the fiber. The energy of the laser thus extends to the tissue surrounding the tip or tip and effects heating. Energy is directed in the beam that is confined to a relatively small angle such that as the fiber rotates, the beam also rotates about the axis of the fiber to affect the heating of different parts of the tumor at different locations around the fiber. Thus, the fibers can be moved longitudinally and rotated to affect the heating of the tumor over all volumes of the tumor and heat the tumor to a desired temperature without appreciable effects on surrounding tissue.

In addition to a surgeon with knowledge of the patient's anatomy and tumor location, the fibers used in ITT procedures can also be controlled or manipulated by a surgeon with little or no instruction. Therefore, it is difficult for the surgeon to influence the controlled heating that heats the entire tumor to the desired level while also minimizing damage to surrounding tissue.

It is known to use magnetic resonance imaging systems to determine the location of tumors and other lesions to be resected. Although these imaging systems have aided surgeons in locating tumors to be resected, their use has ceased once the tumor's location has been mapped for the surgeon. Specifically, previous resection steps required removal of the patient from the imaging system prior to initiating treatment. However, patient movement, as well as partial resection or coagulation of some tissue, can significantly alter the location of the tumor to be resected. As a result, any possibility of providing controllable precision during resection is eliminated.

It is well known that magnetic resonance imaging systems can be used to determine the temperature of tissue within an image by modifying the imaging sequence, and to determine changes in temperature over time.

US Patent No. 4,914,608 (LeBiahan), issued April 3, 1990, assigned to the US Department of Health and Human Resources Services, discloses a method of determining tissue temperature.

U.S. Patent No. 5,284,144 (Delannoy), issued February 8, 1994, assigned to the U.S. Department of Health and Human Services, discloses a device for hyperthermia treatment in which an external noninvasive heating system is installed Inside the coils of an MRI system. The disclosure is purely theoretical and involves first experiments with the feasibility of MRI measurements of temperature and external heating systems. The disclosure of this patent did not result in a commercially viable hyperthermia system.

U.S. Patent Nos. 5,368,031 and 5,291,890 assigned to General Electric relate to MRI controlled heating systems in which a point heat source produces a predetermined heat distribution which is then monitored to ensure actual The heat distribution is consistent with the expected heat distribution. The patented configuration has yet not resulted in a commercially viable hyperthermic surgical system.

U.S. Patent No. 4,671,254 (Fair), issued on June 9, 1987 and assigned to Memorial Hospital for Cancer and Allied Diseases, discloses a method for non-surgical treatment of tumors by subjecting them to shock waves. This type of treatment does not include monitoring systems to monitor and control the effects of the shock waves.

Co-assigned US Patent No. 5,823,941 (Shaunnessey), issued October 20, 1998, discloses a specially modified endoscope designed to support optical fibers. The fiber emits light energy and can be moved longitudinally and rotated axially along its axis to direct energy. The device is used to resect a tumor, and the energy is configured to be sufficient to affect the vaporization of the tumor to be resected. The gas formed during this process can be expelled by suction through the endoscope. Images of the tumor are obtained by MRI, which are then used to program the path of movement of the fiber to be removed during surgery. Again, there is no feedback in controlling the movement of the fiber, and the operation is entirely dependent on up-front analysis. This configuration has also not achieved commercial or medical success.

U.S. Patent No. 5,454,807 (Lennox), issued October 3, 1995, assigned to Boston Scientific Corporation, discloses a device for irradiating tumors with light energy from optical fibers. Cooling fluid is provided through a catheter within the fiber optic to apply surface cooling and prevent surface damage while allowing increased energy to be applied deeper into the tissue. Again, this configuration provides no feedback control of the heating effect.

US Patent 5,785,704 (Lennox), issued Jul. 28, 1996, assigned to MRC System GmbH, also discloses a specific arrangement for irradiating brain tumors using a laser beam and a lens. Specifically, this configuration uses high-speed pulsed laser energy to achieve a photo-disruption effect, but does not disclose a method of feedback control of the energy.

Kahn et al. in Journal of Computer Assisted Tomography 18(4):519-532, July/August 1994; Kahn et al. in Journal of Magnetic Resonance Imaging 8:160-164, 1998; and Vogl et al. in Radiology 209:381-385, 1998 both disclosed a method of applying thermal energy of a laser to a tumor through an optical fiber, wherein the temperature of the periphery of the tumor was monitored using MRI during the application of the thermal energy. McNichols, RJ et al., Lasers in Surgery and Medicine, 34:48-55, 2005, in an article entitled "MR Thermometry-Based Feedback Control of LITT at 980nm" disclose energy control configured by MRI feedback monitoring. In addition, the Vogl article discloses a cooling system for cooling tissue at the tip of a probe that is commercially available from Somatex, Berlin, Germany. The system is formed by installing an inner tube containing optical fibers within an outer tube. Coolant passes between the two tubes and forms a continuous flow within the inner tube.

Although ITT is highly efficient in some applications, the use of ITT to treat brain tumors has been limited due to the inability of ITT to focus energy specifically and precisely on the tumor to avoid damage to surrounding normal brain tissue. In fact, the above issues are compounded by the highly irregular shape of many brain tumors.

Focused laser interstitial thermotherapy (f-LITT) is the next general improvement in laser-based hyperthermia technology. In particular, f-LITT enables precise control of the deposition of thermal energy, allowing physicians to specifically control cellular damage within tumor masses of virtually any size and shape. However, this requires a device that enables the physician to precisely fix the position of the patient's head while avoiding interference with the trajectory guide tool that is typically used to guide the exothermic treatment probe into the tumor mass.

Therefore, there is a heretofore unresolved need for a head immobilization device capable of accurately immobilizing the position of a patient's head such that the access point of the patient's head is unobstructed regardless of where the access point is located. The head fixation device should preferably be independently rotatable relative to the MRI coil surrounding the patient's head. Furthermore, the head fixation system should preferably be usable with customizable MRI coils having two or more replaceable coil sections to accommodate various trajectories and entry points to the patient's head.

Contents of the invention

The present invention solves the above problems by providing a head restraint system comprising a platform; a retainer ring rotatably coupled to a ring mount extending from an upper surface of the platform, wherein the retainer ring including a plurality of slots extending along the circumference of the fixation ring; a head support configured to be inserted into a first slot of the plurality of slots in the fixation ring; a first fixation post having a an engaged first fixation pin, wherein the first fixation post is configured to be inserted into a second slot of the plurality of slots in the fixation ring; a second fixation post having a second fixation pin engaged with the patient's skull, wherein the second fixation post is configured to be inserted into a third slot of the plurality of slots in the fixation ring; and an MRI coil comprising a top coil member and a bottom coil member movably mounted to a platform, wherein the MRI The coil is rotatable relative to and independent of the stationary ring.

Description of drawings

1 is a perspective view of an exemplary trajectory guide that may be used in conjunction with the head restraint system of the present invention.

Figure 2 shows the first step of the planning process, where an MRI scan depicts the identification of a tumor in the patient's brain.

FIG. 3 shows a second step of the planning process, depicting the visual display produced by the planning software showing the patient's head and the tumor location identified in FIG. 2 .

Figures 4A-D illustrate the third step of the planning process, in which a virtual trajectory guide is placed over a user-selected entry point.

Figures 5A-D illustrate the fourth step of the planning process, in which the virtual trajectory guides are adjusted to establish the desired trajectory.

6A-D illustrate a fifth step of the planning process in which the patient's head is displayed with trajectory guides within a virtual head fixation system.

7A is a perspective view of an exemplary embodiment of a head system according to the present invention.

7B is a perspective view of an exemplary embodiment of a head fixation system including a head fixation device, an MRI coil, and a transfer couch.

7C is a perspective view of an MRI coil that may be incorporated with the head fixation device of the present invention.

8A-8D illustrate a head fixation device operably coupled to a patient's head.

9-13 illustrate the head fixation system of Figs. 7A-7C in use during surgery.

Detailed ways

Generally, the present invention includes methods and systems for orienting and immobilizing a patient's head in preparation for performing a surgical procedure requiring trajectory alignment. More specifically, the present invention includes an adjustable head fixation system that enables the surgeon to select virtually any point of entry (and thus, any trajectory) on the patient's head, without interfering with the MRI coil surrounding the patient's head. Attach suitable track guides without risk of interference. Although reference is made to brain tumors and brain surgery, those skilled in the art will appreciate that the systems and methods according to the present invention are designed for use in any surgery requiring head fixation.

Before describing the head fixation system in detail, an exemplary embodiment of a trajectory guide that may be used with the head fixation system during a surgical procedure will be discussed. Several optional "planning" steps in preparation for the process will also be discussed.

1 is a perspective view of an exemplary embodiment of a trajectory guide 10, which generally includes a base plate 11, a plurality of feet 12 attachable to a patient's skull or other body parts, and as many feet as the number of feet 12. 14 adjustable telescopic legs. As shown in FIG. 1 , the trajectory guide 10 may be oriented such that the tool or instrument to be aligned defines a trajectory T. As shown in FIG. These tools or devices may include, but are not limited to, probes, catheters, biopsy needles, drills, and the like.

The base plate 11 of the track guide 10 includes a top clip 16 and a bottom clip 18 that are hingedly coupled together by a hinge arrangement 19, which may include a second clip extending from the top clip 16 configured to extend from the bottom clip 18. The hinge portion 22 cooperates with the first hinge portion 20 . The first hinge portion 20 and the second hinge portion 22 may be coupled together via any suitable connecting means, such as a pin 24 or similar connecting device. Furthermore, the top clip 16 and the bottom clip 18 can be locked together in the closed position with the clip lock 25 after the trajectory is determined.

The top clamp 16 and the bottom clamp 18 each include an opening configured to allow the ball joint moveable member 26 to be movably and rotatably seated therebetween. The ball joint moveable member 26 may include an adapter receiving member 28 and a central receiving cavity (not shown in FIG. 1 ) extending through the adapter receiving member 28 and the ball joint moveable member 26 . The adapter receiving member 28 of the ball joint moveable member 26 may be configured to receive a central ball adapter 30 which in turn may be configured to receive and connect various tools.

As shown in FIG. 1 , central ball adapter 30 passes over ball joint moveable member 26 from the top and includes tubular portion 32 and connecting portion 34 configured to mate with adapter receiving member 28 of ball joint moveable member 26 . First fastening means 36 may be coupled to the adapter receiving member 28 for securing the central ball adapter 30 to the ball joint movable member 26 after the central ball adapter 30 has been inserted into the ball joint movable member 26 . In particular, the first fastening means 36 may be any suitable fastening means including, but not limited to, thumb screws and the like. After the central ball adapter 30 is fully inserted into the adapter receiving member 28 of the ball joint moveable member 26, the thumb screw may be tightened to lock the central ball adapter 30 in place. Thereafter, the user may remove the central ball adapter 30 from within the adapter receiving member 28 by simply loosening the thumbscrew and sliding the adapter 30 .

The central ball adapter 30 may include a lumen 38 extending through the tubular portion 32 and the connecting portion 34 configured to receive a surgical tool. The diameter of the lumen within the various hub adapters can vary with the size of the stylet and/or instrument that the lumen is designed and configured to accommodate. Additionally, the central ball adapter 30 may include a second fastening means 40 for securing the tool in place once the tool has been deployed within the lumen 38 . As will be appreciated by those of ordinary skill in the art, the second fastening device 40 is similar to the first fastening device 36 previously described.

As shown in FIG. 1 , each adjustable telescoping leg 14 may include a ball joint end 42 and a hinged end 43 . The length of each leg 14 can be adjusted, and after the trajectory is determined, the leg cam lock 44 can be used to lock the leg at the desired length.

In addition, as shown in FIG. 1 , trajectory guide 10 may optionally include a mesh assembly 45 designed to assist feet 12 with proper fit during placement of trajectory guide 10 on a patient. gap and orientation.

In order to determine proper placement of the trajectory guide 10 on the patient and the desired trajectory of the guide (ie, the length/orientation of the legs and the orientation of the ball joint movable member), several planning steps may be performed. Exemplary but non-limiting planning steps to be performed using a custom software program will now be described.

In the first planning step shown in Figure 2, various MRI scans are taken and uploaded into the planning software. Then, in a second planning step, the desired entry point is determined by the surgeon. As shown in Figures 3A-3D, the planning software can be designed to display a depiction of a tumor 300 on and within the patient's head. Various possible entry points 310 are also shown. The planning process continues, as shown in Figures 4A-4D, in step 3, a "virtual" trajectory guide is placed over the user-selected entry point and displayed to the surgeon. Next, as shown in Figures 5A-5D, in a fourth planning step, the legs and ball joint movable members on the virtual trajectory guide are adjusted to establish the desired trajectory to the tumor. Finally, in a fifth planning step, as shown in Figure 6, the patient's head and trajectory guide can be visualized within a "virtual" head fixation system to determine the desired position of the fixation posts/pins and desired fixation rings Orientation, as described in further detail below.

As one of ordinary skill in the art understands, because surgical planning is performed in a "virtual" environment using software, it can be done days or weeks before the actual surgery.

After the surgical planning is complete, the surgeon can then, or at any time thereafter, proceed to the actual surgical procedure by physically placing the patient in the head fixation system.

Figure 7A is an exemplary but non-limiting embodiment of a head fixation system 100 in accordance with the present invention. As shown in FIG. 7A, the head fixation system 100 generally includes a platform 102, a head fixation ring 104 rotatably coupled to a ring support 106 extending from an upper surface of the platform 102, a head support 108, and a plurality of fixation posts. 110. The head retainer ring 104 includes a plurality of grooves 112 extending along its circumference. As shown in FIG. 7A, the head support 108 is movably received by a first slot 112, the first fixed post 110A is movably received by a second slot 112, and the second fixed post 110B is movably received by a third slot 112. Move to accommodate. The first, second and third slots 112 may be any slots along the circumference of the head fixation ring 104 according to the desired trajectory and may be selectively selected during the software planning process described above. As understood by those of ordinary skill in the art, the head restraint system 100 may include fewer or more fixation posts than shown. For example, in one exemplary alternative embodiment, head fixation system 100 includes four fixation posts.

The first securing post 110A includes a plurality of securing pin apertures 116A along its length adapted to receive one or more securing pins 114A, 114B. The retaining pins 114A, 114B may be threadedly received by retaining pin holes 116A, 116B, respectively, thereby providing various "penetration depths" for setting the retaining pins. The first adjustable retaining pin 114A extends inwardly toward the center of the head retaining ring 104 after being received by the retaining pin hole. In addition to the adjustable "penetration depth" of the fixation pin 114A, the multiple fixation pin holes 116A, 116B on the fixation posts 110A, 110B provide the surgeon with various fixation pin placement options. Similarly, the second fixed post 110B includes a second adjustable fixed pin 114B that is movably and adjustably received by one of a plurality of fixed pin holes 116B along the length of the post 110B. As mentioned above, any number of fixation posts may be utilized depending on the nature of the procedure.

Head fixation ring 104 is movably and rotatably disposed within ring mount 106 . Head retaining ring 104 is rotatable relative to platform 102 (as indicated by arrow 118) to adjust the angular position of the patient's head. The head fixation ring 104 can be locked in a desired position by one or more ring locking devices 120 . In an exemplary embodiment, the ring locking device 120 may include one or more retractable pins (not shown) that are inserted into one of the plurality of holes 122 along the peripheral edge of the head securing ring 104 . One or more are accommodated.

Platform 102 may be integrally coupled to patient board 105 . Additionally, platform 102 may be detachably coupled to patient board 105 by hinges or similar mechanisms known to those skilled in the art. Additionally, the platform 102 can be placed adjacent to the patient board 105 depending on the desired procedure. The handle 107 facilitates moving the patient and the system according to the invention during use.

Additionally, as shown in FIG. 7A , the head fixation system 100 includes a coil support 124 integrally or non-integrally/removably coupled to the platform 102 . The coil support 124 is configured to removably receive an MRI coil thereon. An exemplary coil 125 is shown in Figures 7B and 7C. Coil 125 includes a bottom coil member 127 and a replaceable top coil member, such as top coil members 129A and 129B shown in FIG. 7C . As will be understood by those of ordinary skill in the art, the top coil member 129A is preferably used for tracks extending from the top of the head, while the top coil member 129B is preferably used for tracks extending from the forehead or the sides of the head. In order to operatively couple the top coil member 129A or 129B to the bottom coil member 127, the top coil members 129A and 129B are provided with alignment pins 131 and electrical connectors 133 configured to mate with the bottom coil member. Corresponding pin groove 135 on 127 cooperates with electric socket 137. The bottom coil member 127 includes a connector 143 operatively coupled to an MRI cable to connect the coil 125 to an MRI system.

Referring to FIGS. 7A and 7B , the first end 139 of the bottom coil member 127 is configured to engage the first coil track portion 126 and the second end 141 of the bottom coil member is configured to engage the second coil track portion 128 . The first coil track portion 126 and the second coil track portion 128 enable the coil 125 to rotate relative to the head retainer ring 104 and independently of the head retainer ring 104 . When rotated into a desired position, coil 125 may be locked by one or more coil locking devices 130 (eg, by exemplary friction locks, pins, screws, or other means known to those skilled in the art).

8-13 illustrate one exemplary process for physically placing a patient's head into the head fixation system 100 described above. Specifically, as shown in FIG. 8 , the process begins by placing the head fixation ring 104 around the head of the patient P. As shown in FIG. This may be performed by coupling the fixation ring 104 to the ring support 106 with the patient lying on the patient transfer board 105 or by detaching the fixation ring 104 from the ring support 106 with the patient standing or sitting. Then, as shown in FIG. 9, the first fixing post 110A and the second fixing post 110B are inserted into the appropriate slots 112 in the head fixing ring 104, and the first fixing pin 114A and the second fixing pin 114B are attached to the patient head. As will be appreciated by those of ordinary skill in the art, the securing pin may comprise any suitable attachment means, such as a threaded shaft. If the head fixation ring 104 was not previously coupled to the ring support 106 (i.e., the fixation ring 104 was not detached from the ring support 106 when the fixation ring 104 was attached to the patient's head), the next step involves attaching the fixation ring 104 to the patient's head. The patient P is placed on the platform 102 and the fixation ring 104 is locked in the ring holder 106 . Subsequently, as shown in FIG. 10 , the head retainer ring 104 is rotated to provide the path guide 10 with access (and entry point) to the installation location.

In the next step of the process, as shown in FIG. 11 , the surgeon attaches the trajectory guide 10 to the head of the patient P based on the information acquired during the surgery planning step. As will be understood by those of ordinary skill in the art, the head fixation ring 104 may be further rotated if necessary to avoid any potential interference between the treatment probe/instrument to be used and the MRI bore. Once the trajectory guide 10 is attached to the patient's head, the patient can be transported into the MRI room and moved to the MRI table.

The process continues with attaching the MRI coil 125 to the patient platform 102 as shown in FIG. 12 . As will be understood by those of ordinary skill in the art, due to the orientation of the trajectory guide 10 on the patient's head, in the example shown, the top coil member 129B is required. As shown in Figure 13, once the coil 125 is assembled, the surgeon can visually verify that the minimum distance D between the trajectory guide 10 and the MRI bore B is maintained. Finally, the surgeon can perform an MRI scan to confirm the trajectory and continue the treatment/procedure.

The foregoing description of exemplary embodiments of the present invention has been presented for purposes of illustration and description only, and is not intended to be comprehensive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the above disclosure.

The embodiments were chosen and described in order to explain the principles of the invention and its practical application, to enable others skilled in the art to utilize the invention and embodiments with various modifications as are suited to the particular use contemplated. Alternative embodiments will be apparent to those skilled in the invention without departing from the spirit and scope of the invention.

Claims (31)

1. a head fixed system, comprising:

Platform, it has upper surface and lower surface;

Ring bearing, it is operationally coupled to the described upper surface of described platform;

Retainer ring, it is rotatably coupled to described ring bearing, and described retainer ring comprises the multiple fixing annular groove of the circumferential extension along described retainer ring;

First fixed leg, it can be received in first fixing annular groove in described fixing annular groove; And

Second fixed leg, it can be received in second fixing annular groove in described fixing annular groove.

2. head fixed system according to claim 1, also comprises and is constructed to be inserted into the head support in the 3rd fixing annular groove in described fixing annular groove.

3. head fixed system according to claim 1, wherein, described fixed leg also comprises at least one the fixing post holes running through described fixed leg.

4. head fixed system according to claim 3, also comprises and can be received with at least one steady pin engaged with patient's skull by least one fixed leg pore volume described.

5. head fixed system according to claim 3, wherein, at least one fixing post holes described comprises multiple fixing post holes.

6. head fixed system according to claim 5, also comprises multiple steady pins that can be held by least one in described multiple hole.

7. head fixed system according to claim 1, also comprises the take-off plate being removably coupled to described platform.

8. head fixed system according to claim 1, also comprises the coil supports being coupled to described platform.

9. head fixed system according to claim 1, wherein, described ring bearing also comprises the first coil guide rail and the second coil guide rail.

10. head fixed system according to claim 1, also comprise MRI coil, described MRI coil has top winding component and is coupled to the bottom coil component of described platform movably, and wherein, described MRI coil can relative to described retainer ring rotation and independent of described retainer ring.

11. head fixed systems according to claim 9, also comprise MRI coil, and described MRI coil has the top winding component rotatably engaged with described first coil guide rail, and the bottom coil component rotatably engaged with described second coil guide rail.

12. head fixed systems according to claim 1, wherein, described head retainer ring comprises the multiple fixing annular distance on the edge being arranged in described head retainer ring circumferentially.

13. head fixed systems according to claim 12, also comprise one or more ring lock that can be held by the one in described multiple fixing annular distance or many persons.

14. head fixed systems according to claim 10 and 11, wherein, described top winding component comprises one or more alignment pin that can match to the corresponding cotter way on described bottom coil component.

15. head fixed systems according to claim 10 and 11, wherein, described bottom coil component comprises the electrical connector in order to described MRI coil to be connected to MRI system.

16. head fixed systems according to claim 10, wherein, described coil supports also comprises one or more coil lock locking equipment in order to described MRI coil lock to be fixed on correct position.

17. 1 kinds of head fixed systems, comprising:

Platform, it has upper surface and lower surface;

Ring bearing, it is operationally coupled to the described upper surface of described platform;

Retainer ring, it is rotatably held by described ring bearing, and described retainer ring comprises the multiple fixing annular groove of the circumferential extension along described retainer ring;

First fixed leg, it can be contained in first fixing annular groove in described fixing annular groove, and described first fixed leg comprises the first steady pin engaged with patient's skull;

Second fixed leg, it can be contained in second fixing annular groove in described fixing annular groove, and described second fixed leg comprises the second steady pin engaged with patient's skull; And

MRI coil, it is rotatably held by described platform and is installed to described platform movably, and wherein, described MRI coil can relative to described retainer ring rotation and independent of described retainer ring.

18. head fixed systems according to claim 17, also comprise and are constructed to be inserted into the head support in the 3rd fixing annular groove in described fixing annular groove.

19. head fixed systems according to claim 17, wherein, described fixed leg also comprises at least one the fixing post holes running through described fixed leg.

20. head fixed systems according to claim 19, also comprise and can be received with at least one steady pin engaged with patient's skull by least one fixed leg pore volume described.

21. head fixed systems according to claim 19, wherein, at least one fixing post holes described comprises multiple fixing post holes.

22. head fixed systems according to claim 21, also comprise multiple steady pins that can be held by least one in described multiple hole.

23. head fixed systems according to claim 17, also comprise the take-off plate being removably coupled to described platform.

24. head fixed systems according to claim 1, also comprise the coil supports being coupled to described platform.

25. head fixed systems according to claim 17, wherein, described ring bearing also comprises the first coil guide rail and the second coil guide rail.

26. head fixed systems according to claim 25, wherein, described MRI coil comprises the top winding component and bottom coil component that are rotatably held by described first coil guide rail and described second coil guide rail.

27. head fixed systems according to claim 17, wherein, described head retainer ring comprises the multiple fixing annular distance on the edge being arranged in described head retainer ring circumferentially.

28. head fixed systems according to claim 27, also comprise one or more ring lock that can be held by the one in described multiple fixing annular distance or many persons.

29. head fixed systems according to claim 10, wherein, described coil supports also comprises one or more coil lock locking equipment in order to described MRI coil lock to be fixed on correct position.

30. 1 kinds of methods using head fixed system, described method comprises:

Head fixed system is provided, described head fixed system comprises retainer ring, the first fixed leg and the second fixed leg, described retainer ring has the multiple fixing annular groove of the circumferential extension along described retainer ring, described first fixed leg can be received in first fixing annular groove in described fixing annular groove, described first fixed leg comprises at least one steady pin, described second fixed leg can be received in second fixing annular groove in described fixing annular groove, and described second fixed leg comprises at least one steady pin;

Described head retainer ring is placed into around patients head;

Described first fixed leg adjustable ground is inserted in described first the fixing annular groove in described fixing annular groove;

Described second fixed leg adjustable ground is inserted in described second the fixing annular groove in described fixing annular groove;

Described steady pin is placed to be fixed into described retainer ring against patients head against patients head.

31. 1 kinds of methods using head fixed system, described method comprises:

Locus guiding part is placed on patients head to set up the track of inlet point;

There is provided head fixing device, described head fixing device comprises:

Platform, it has upper surface and lower surface, and described platform comprises MRI receive coil guide rail;

Ring bearing, it is operationally coupled to the described upper surface of described platform;

Retainer ring, it is rotatably coupled to described ring bearing, and described retainer ring comprises the multiple fixing annular groove of the circumferential extension along described retainer ring;

First fixed leg, it can be received in first fixing annular groove in described fixing annular groove; With

Second fixed leg, it can be received in second fixing annular groove in described fixing annular groove, and described fixed leg comprises one or more steady pin;

Described retainer ring is placed on around patients head;

Regulate described first fixed leg in described fixing annular groove and described second fixed leg;

Utilize described steady pin that described fixed leg is fixed to patients head;

Described retainer ring is locked in described ring bearing;

Rotate described retainer ring to provide the path towards described inlet point;

By being placed in described MRI receive coil guide rail by described MRI coil, described MRI coil is attached to described platform;

Carry out MRI scanning to determine described track.