KR200321814Y1 - Heterogeneous phantom for radiation dosimetry - Google Patents

Abstract

The present invention relates to a heterogeneous phantom for radiation dose measurement. This is to take the radiation irradiated from the radiation emitting part and measure the dose. The radiation has the predetermined thickness and passes the radiation irradiated from the outside, but has the electron density corresponding to the tissue density of the predetermined part of the body. A plate stack comprising a plurality of unit plates stacked so as to be equal to an energy level after passing through a predetermined portion of the tissue; Measuring means installed at a desired position of the plate stack and measuring an energy level of radiation passing through a unit plate; It characterized in that it comprises a frame for supporting the plate stack.

The non-homogeneous phantom for radiation dose measurement of the present invention made as described above has a simple structure and low cost, and in particular, by applying a plurality of plate members having a tissue density corresponding to the density of a tissue of a predetermined part in the human body, all depths in the body And it is possible to accurately predict the radiation dose at the site and using these results can be used for the purpose of quality control, such as radiation therapy device, as well as has an effect that can be applied to other experiments to evaluate the human heterogeneous effect.

Description

Heterogeneous phantom for radiation dosimetry

The present invention relates to a measuring device for measuring the radiation dose generated in various radiation output devices, in particular the radiation dose for measuring the dose of radiation output from a medical linear accelerator for outputting high energy radiation It relates to a heterogeneous phantom for measurement.

Among the radiations used for medical treatment, radiation is applied to cancer patients' tumors so that cancer cells can no longer reproduce and are used to kill cancer cells at the end of their life or to relieve pain.

Such radiation therapy can be used to prevent recurrence, for example, in cases where cancer cells are more likely to remain after surgery, or when surgery is not possible, or when radiation therapy is more effective than surgery, or a combination of surgery and radiation therapy If the patient wants to improve the quality of life, or in combination with chemotherapy to maximize the anti-cancer effect.

On the other hand, the radiation treatment is made by expensive medical equipment called a linear accelerator (linear accelerator). The linear accelerator is capable of outputting X-rays and electron beams, and is capable of output energy control and high dose rate.

When performing radiation treatment with the linear accelerator, the most important thing is to ensure that the linear accelerator outputs radiation of suitable energy. It is very important to ensure that the linear accelerator outputs the radiation with the optimal energy because the maximum therapeutic effect can be achieved only by irradiating the radiation with the optimal energy corresponding to the condition, size, or depth of the tumor.

Therefore, before using the linear accelerator, it is necessary to check the operation precision such as whether the linear accelerator operates properly, in particular, the radiation dose is properly adjusted to output the required energy radiation. This is called quality control, and the hospital performs quality control periodically or aperiodically.

Various kinds of radiation dose measuring apparatuses are used for the quality control. The radiation dose measuring apparatus has a basic mechanism that receives radiation from the lower portion of the radiation emitting unit and generates a signal corresponding to the magnitude of the irradiated energy to inform the outside.

However, conventional radiation dose measuring instruments are mostly dependent on imports, and furthermore, their price ranges from tens of thousands to hundreds of thousands of dollars, so it is virtually difficult to own and operate such measuring instruments in hospital finance. Without such a measuring device, it is impossible to optimize the radiation energy size according to the characteristics of the patient's tumor. Therefore, it is impossible to prescribe optimal radiation, resulting in a very low therapeutic effect. It may cause an accident.

In addition, most conventional radiation dose measuring apparatus has a problem that it takes a long time to set the device. Therefore, it is not easy to manage the quality of the device every busy morning, it takes a long time and hassle has a problem that the quality control itself can be neglected.

The present invention has been made to solve the above problems, and the structure is simple and inexpensive, and especially at all depths and parts of the body by applying a plurality of plate members having a tissue density corresponding to the density of the tissue of a predetermined part in the human body. It can be used to accurately predict the radiation dose of radiation, and can be used for the quality control of radiation therapy devices, etc., as well as providing a non-homogeneous phantom for radiation dose measurement that can be applied to other experiments to evaluate the non-homogeneous effects of human body There is a purpose.

1 is a view showing for explaining the use example of the heterogeneous phantom for radiation dose measurement according to an embodiment of the present invention.

Figure 2 is a perspective view of the heterogeneous phantom for measuring radiation dose according to an embodiment of the present invention.

3 is an exploded perspective view of the heterogeneous phantom shown in FIG.

4 is a perspective view showing an example of a plate laminate applied to the heterogeneous phantom for radiation dose measurement shown in FIG.

5 is a perspective view of a plate laminate applicable to the heterogeneous phantom for radiation dose measurement shown in FIG.

Figure 6 is a perspective view of a teflon plate that can be applied to the heterogeneous phantom for radiation dose measurement according to an embodiment of the present invention.

Figure 7 is a perspective view of the cork plate applicable to the heterogeneous phantom for radiation dose measurement according to an embodiment of the present invention.

Figure 8 is a perspective view of a space plate that can be applied to the heterogeneous phantom for radiation dose measurement according to an embodiment of the present invention.

9 to 11 are perspective views sequentially showing a cork plate, a teflon plate and a titanium plate which can be applied to a heterogeneous phantom for measuring radiation dose according to an embodiment of the present invention.

12 is a perspective view showing a TLD support plate that can be used in the heterogeneous phantom for radiation dose measurement according to an embodiment of the present invention.

Figure 13 is a perspective view of the ion chamber installation plate that can be used in the heterogeneous phantom for radiation dose measurement according to an embodiment of the present invention.

14 and 15 are views for explaining various uses of the heterogeneous phantom for measuring radiation dose according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

11: Linear accelerator 13: Body

15: Rotating Gantry 16: Radiation Emission

19: Table 21: Inhomogeneous phantom

23: upper frame 25: lower frame

27: connecting rod 27a: male thread

29: fixing nut 31: plate laminated body

33: Through-hole 35: Fixture

37: support groove 39: first plate

41: 2nd plate 42: Middle plate

43: third plate 43a, 47a: through hole

45: fourth plate 47: fifth plate

49: teflon plate 51: cork plate

53: space plate 53a: space part

55: Cork board 57: Teflon board

59: titanium plate 61: TLD support plate

61a: receiving groove 63: ion chamber mounting plate

63a: Mounting port 67: Thermal fluorescent detector (TLD)

69: ion chamber 71: film

73: support bracket 75: bracket support groove

77: Bracket through hole

In order to achieve the above object, the present invention receives radiation irradiated from a radiation emitting unit and measures a dose thereof, and has a predetermined thickness to pass radiation irradiated from the outside, but at a tissue density of a predetermined portion of the body. A plate stack comprising a plurality of unit plates laminated with a plurality of unit plates having a corresponding electron density such that radiation is equal to an energy level after passing through a predetermined portion of body tissue; Measuring means installed at a desired position of the plate stack and measuring an energy level of radiation passing through a unit plate; It characterized in that it comprises a frame for supporting the plate stack.

In addition, each unit plate is a square plate of the same width, acrylic plate made of acrylic, Teflon plate made of Teflon, cork plate made of cork (cork), and the center portion made of acrylic except the edge Is penetrated to include a space plate for providing a space in the center, wherein at least one or more types of unit plates are selectively used in the plate laminate, and at least one or more types of unit plates are used. do.

In addition, the unit plate is a rectangular acrylic plate, characterized in that at least one acrylic plate is formed with at least one through hole for providing a space therein.

In addition, the through hole of the acrylic plate is characterized in that the selected one of the cork plate, Teflon plate, titanium plate of a predetermined thickness is inserted.

In addition, the measuring means is a acrylic plate of a predetermined thickness characterized in that it comprises a TLD support plate formed with a plurality of receiving grooves on one side thereof, and a thermofluorescence dosimeter (TLD) is inserted into each of the receiving grooves .

In addition, the measuring means is an acrylic plate of a predetermined thickness, characterized in that it comprises an ion chamber mounting plate is formed in the mounting hole for inserting the tubular ion chamber therein, and the ion chamber is inserted into the mounting hole, characterized in that do.

In addition, the frame; An upper frame positioned on the plate laminate and covering the upper edge portion of the plate laminate, a lower frame positioned below the plate laminate and supporting the lower edge portion of the plate laminate, and the upper frame and the lower frame It characterized in that it comprises a connector for connecting and pressing the upper frame and the lower frame in a direction close to each other.

Hereinafter, one embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an example of the use of the non-homogeneous phantom for radiation dose measurement according to an embodiment of the present invention, the linear accelerator 11 is taken as an example of the radiation emitting device in this embodiment.

As is known, the linear accelerator 11 is usually composed of a body 13 and a rotating gantry 15 connected to the body 13 and axially rotatable with respect to the body 13. The main body 13 has a high voltage generator, a microwave generator, and the like, and the inside of the rotating gantry 15 has an acceleration tube, a magnetic field generator, and a radiation emitter 16 for accelerating electrons. have. In addition, the table 19 is located on the side of the rotary gantry (15). The table 19 is a place where the patient to be treated is exposed, and horizontal and vertical positioning is free.

On the other hand, the non-homogeneous phantom 21 for measuring the radiation dose according to the present embodiment is located in the vertical lower portion of the radiation emitting portion 16 passes the radiation irradiated downwards therein and grasps the energy level of the radiation. To this end, a measuring mechanism for measuring the energy level of radiation is installed inside the heterogeneous phantom 21.

2 is a perspective view of a heterogeneous phantom for measuring radiation dose according to an embodiment of the present invention.

Basically, the heterogeneous phantom 21 for radiation dose measurement according to the present embodiment includes a plate stack 31 formed by stacking a plurality of square acrylic plates, and a plate stack 31 below the plate stack 31. A lower frame 25 supporting the lower edge portion of the plate), an upper frame 23 positioned on the plate laminate 31 and covering an upper edge portion of the plate laminate 31, and the plate laminate ( 31, a pair of support brackets 73 which are perpendicular to the diagonal direction and support the plate stack 31 so that the plate stack 31 is aligned, the upper frame 23 and the lower frame ( 25 is configured to include four connecting rods 27 and fixing nuts 29 for connecting.

The plate laminate 31 is a laminate formed by stacking a plurality of unit plates (39 to 47 of FIGS. 4 and 5) having various thicknesses. Each unit plate is a rectangular plate, the width of which is the same, but the thickness is different.

The unit plate is made of transparent acrylic to receive the radiation irradiated from the outside to pass through. As is well known, acrylic is a material that is mainly used to simulate human tissue because its density is similar to that of general tissues in the human body. As the unit plate is made of acrylic in this way, the dose of radiation that will reach a predetermined depth in the human body can be known through the dose of radiation that reaches the same depth of the plate stack 31.

Although the thickness of the unit plates 39 to 47 is not particularly determined, in the present embodiment, the thickness of the first plate (39 in FIG. 4) is 5 cm, the thickness of the second plate 41 is 2 cm, and the third plate 43 is 1 cm, the fourth plate 45 was 0.5 cm, and the thickness of the teflon plate (49 in FIG. 6), the cork plate (51 in FIG. 7) and the space plate (53 in FIG. 8) to be described later was set to 1 cm. .

However, as described above, the thickness of each unit plate may vary depending on the case, and may have a thickness other than the thickness. For example, in order to more precisely control the depth of the plate stack 31, 0.1mm or 0.2mm thick unit plate may be used. Of course, the number of unit plates of the same thickness can be added or subtracted as needed.

When the radiation dose is measured, the overall height of the plate stack 31 is, of course, changed if the number of use of each unit plate is changed. The stacking order of the unit plates constituting the plate stack 31 can be changed as necessary. In order to cope with the height change of the plate stack 31 as described above, a male thread 27a was formed on the outer circumferential surface of the connecting rod 27, and the connecting rod 27 penetrated upwardly through the upper frame 23 to fix the nut. To (29).

3 is an exploded perspective view of the heterogeneous phantom shown in FIG.

As shown, the lower frame 25 is in contact with the bottom edge of the plate laminated body 31 has a form of a rectangular plate through which the center portion is penetrated to provide a support force. On the upper surface of the lower frame 25, the support groove 37 and the support bracket for accommodating the edge portion of the lower unit plate to prevent the plate stack 31 from moving forward, backward, left and right relative to the lower frame 25 Bracket support groove 75 and the fastener 35 for supporting the lower end of the) is formed.

The bracket support groove 75 is a groove formed at four corners of the lower frame 25, and when the plate stack 31 is seated on the lower frame 25, the bottom outer surface of the edge of the plate stack 31 is formed. And forming a groove between its inner wall to insert and fix the lower end of the support bracket 73 therein.

The support bracket 73 is one support column having a cross-sectional shape of the letter "A". The support bracket 73 is positioned in a diagonal direction with the plate stacking body 31 interposed therebetween. The support bracket 73 supports the plate stack 31 on its inner side so that the plate stack 31 is always neatly positioned. The support bracket 73 is extended to the upper end of the support bracket 73 is supported by the bracket support groove 75 is inserted and fixed to the bracket through-hole 77 of the upper frame (23).

The fastener 35 is a cylindrical groove having a predetermined depth and is positioned at four corners of the lower frame 25 like the bracket support groove 75 and accommodates and fixes the lower end of the connecting rod 27 therein.

The connecting rod 27 is a rod-shaped member having a constant diameter, and a male thread 27a is formed on an outer circumferential surface of approximately half in the longitudinal direction. The connecting rod 27 extends vertically with its lower end fixed to the inside of the fixture 35 so that the upper end of the male thread 27a is formed upward of the through hole 33 of the upper frame 23. To pass. The fixing nut 29 is screwed to the connecting rod 27 passing through the through hole 33.

The upper frame 23 is a rectangular frame having an empty central portion, such as the lower frame 25, and a supporting groove (not shown) is formed on the bottom thereof to support the upper edge portion of the plate stack 31. The bracket is provided with a bracket through hole 77 and a through hole 33. The through hole 33 is located in the vertical upper portion of the fastener 35 and the bracket through-hole 77 is located in the vertical upper portion of the bracket support groove 75, of course.

The through hole 33 is a hole for passing through the upper end of the connecting rod 27, the bracket through-hole 77 is a hole for receiving and supporting the upper end of the support bracket (73). The bracket through hole 77 takes the shape of the letter A corresponding to the cross section of the support bracket (73).

The upper frame 23 is fixed to the lower frame 25 through the connecting rod 27 in a state in which the upper frame 23 is placed on the upper end of the plate stack 31. The upper frame 23 in a state where the plate stack 31 is sandwiched by screwing the fixing nut 29 to the male thread 27a of the connecting rod 27 passing through the through hole 33 upwardly. Combination of the lower frame 25 is made. Of course, if the fixing nut 29 is tightened more strongly against the male thread 27a, the plate stack 31 is compressed as much as that.

Figure 4 is a view showing an example of a plate laminate that can be applied to the heterogeneous phantom for radiation dose measurement according to an embodiment of the present invention.

Referring to the drawings, the unit plate that can be applied to the plate stack 31 according to the present embodiment, the first plate 39, the second plate 41, the third plate 43, It consists of a 4 plate 45 and a 5th plate (47 of FIG. 5), and the intermediate plate 42. As shown in FIG. The first plate 39 to the fifth plate 47 and the intermediate plate 42 are all made of acrylic.

In addition, as described above, the number of unit plates of the same size can be appropriately added or subtracted as necessary. In this drawing, two first plates 39 are applied, but for example, three or five may be applied. For example, the plate 41 may use only one or ten may be used. The same applies to other unit plates.

The through hole 43a is formed at a predetermined position of one side of the third plate 43. The through hole 43a may be empty as necessary as a rectangular through hole and may accommodate a cork plate 55, a teflon plate 57, or a titanium plate 59 to be described later. The cork plate 55, teflon plate 57 and titanium plate 59 will be described later.

The intermediate plate 42 is a plate having the same size as the third plate 43, but the through hole 43a is not formed. Therefore, the cork plate 55, the Teflon plate 57, or the titanium plate 59 positioned in the lower portion of the third plate 43 and accommodated in the through hole 43a of the third plate 43 may be supported. However, since the fourth plate 45 is half of the thickness of the intermediate plate 42, the fourth plate 45 may be overlapped without using the intermediate plate 42.

The fourth plate 45 is a rectangular acrylic plate that can be used at any position of the plate stack 31, for example, at the top layer of the plate stack 31 or in the middle.

FIG. 5 is a perspective view illustrating a fifth plate applicable to the heterogeneous phantom for measuring radiation dose shown in FIG. 2.

The fifth plate 47 has the same size as the third plate 43 and has only two through holes 47a. The through hole 47a may be empty as in the third plate 43, and may accommodate the cork plate 55, the Teflon plate 57 or the titanium plate 59.

On the other hand, the tissue density of the cork (cork) forming the cork plate 55 corresponds to the tissue density of the lungs of the human body, for example, stacking the fifth plate 47 by a predetermined height and in each through hole 47a. When radiation is applied from the top with the cork plate 55 filled, the energy level at the desired depth of the radiation passing through the cork plate 55 in the thickness direction can be known. It is possible to know the intensity of radiation and to make an accurate radiotherapy plan.

In addition, the Teflon material constituting the Teflon plate 57 corresponds to the tissue density of bone in the human body, and the titanium material constituting the titanium plate 59 corresponds to the tissue density of various prostheses. The prosthesis refers to various metallic members inserted into the human body through surgical operations.

Installing a teflon plate (49 in FIG. 6) in the plate laminate 31 is to know the dose of radiation passing through the teflon plate. For example, if the cancer patient's tumor is hidden in the lower part of the bone, the required amount of radiation must pass through the bone to reach the tumor, so that the Teflon plate is irradiated with the thickness of the Teflon plate laminated to the thickness of the bone. By knowing the radiation dose after passing through, it is possible to find out the radiation dose to the tumor through the bone during the actual procedure, so that the power of the linear accelerator can be accurately set according to the treatment plan.

Of course, the titanium plate (59 in Figure 11) also has the same function as the Teflon plate 57. That is, the titanium plate (59 in Fig. 11) is also passed through the radiation in the state installed in the required position of the plate stack 31 so that the radiation dose of the lower portion can be known. Since the titanium plate 59 has a density corresponding to that of the prosthesis in the body, if there is a prosthesis in the patient's body and the tumor is located below the prosthesis, the titanium plate 59 uses the titanium plate 59 to form a prosthesis. It is possible to know in advance the dose to be applied.

6 is a perspective view of a teflon plate applicable to the heterogeneous phantom for measuring radiation dose according to an embodiment of the present invention.

The Teflon plate 49 is a square plate made of Teflon, and the size thereof may be the same as that of the third plate 43. The teflon plate 49 is interposed at a desired position of the plate stack 31 to pass the radiation, if necessary. The basic function of the Teflon plate 49 is the same as the Teflon plate 57.

In addition, the thickness of the teflon plate may be variously modified, and a plurality of teflon plates having different thicknesses or the same thickness may be used in appropriate combination.

7 is a perspective view of a cork plate 51 that can be applied to a heterogeneous phantom for measuring radiation dose according to an embodiment of the present invention.

The cork plate 51 also has the same size as the teflon plate 49. In addition, it is a matter of course that a plurality of cork plates having a different thickness or the same thickness as necessary may be used in combination as appropriate.

8 is a perspective view of a space plate 53 applicable to a heterogeneous phantom for measuring radiation dose according to an embodiment of the present invention.

As shown, the space plate 53 is a plate that penetrates the center portion excluding the edge thereof to provide the space portion 53a. The space plate 53 is made of acryl as a plate that simulates the empty space in the body by separating the plate stacked above and below their thickness.

The size of the space plate 53 may be the same as the third plate 43. In addition, a plurality of space plates having a different or the same thickness as in the above-described Teflon plate can be used in combination as appropriate as appropriate.

Meanwhile, the Teflon plate 49, the cork plate 51, or the space plate 53 is not used one by one but is used in combination of at least two or more. This is because the internal structure of the human body is heterogeneous. Positions of the plates 49, 51 and 53 with respect to the plate stack 31 and combination examples of each plate are numerous and one example is shown in FIG.

9 to 11 are perspective views sequentially showing a cork plate, a teflon plate and a titanium plate which can be applied to a heterogeneous phantom for measuring radiation dose according to an embodiment of the present invention.

As shown, the cork plate 55, the teflon plate 57 and the titanium plate 59 take the form of a rectangular plate and the through-holes 43a of the third plate 43 or the fifth plate 47, 47a). The thickness of the cork plate 55, the teflon plate 57 and the titanium plate 59 may be the same as the thickness of the third and fifth plates 43 and 47, or may be differently manufactured.

The basic functions of the cork plate, teflon plate and titanium plate are as described above, and in most cases, they are not used alone but in combination with each other.

On the other hand, a measuring device for measuring the dose of radiation incident on the inside of the plate stack 31 is provided inside the plate stack 31. In this embodiment, a thermofluorescence dosimeter (TLD) or an ion chamber is used as the measuring device. An instrument fixing plate is provided to install the thermofluorescence dosimeter or ion chamber at a predetermined position in the plate stack 31.

As the mechanism fixing plate, a TLD support plate 61 or an ion chamber mounting plate (63 in FIG. 13) is used. The instrument fixing plate has a predetermined thickness and is interposed at a desired position of the plate stack 31 to fix and support a measuring instrument for measuring the energy level of radiation passing through each unit plate, Teflon, cork, or titanium layer. .

12 is a perspective view showing a TLD support plate that can be used for the heterogeneous phantom for measuring radiation dose according to an embodiment of the present invention.

Referring to FIG. 12, the TLD support plate 61 takes the form of a square plate like other plates and has a plurality of receiving grooves 61a on its upper surface. The accommodating groove 61a is a cylindrical groove and accommodates the thermofluorescence detector A therein. The receiving groove 61a is arranged in the form of a crisscross pattern based on the center of the TLD support plate 61.

By arranging the thermofluorescence detector 67 in the above manner, the radiation dose can be known over a wide range, and the relative energy level distribution in the same plane of the radiation passing through the plate stack 31 can be identified. .

The thickness of the TLD support plate 61 is as thin as possible to minimize the effect of heterogeneity. The thickness of the TLD support plate 61 may be thinner than approximately 0.1 cm.

Figure 13 is a perspective view of the ion chamber installation plate that can be used in the heterogeneous phantom for radiation dose measurement according to an embodiment of the present invention.

As shown, the ion chamber mounting plate 63 is a square plate made of acryl, and an installation hole 63a is formed at the center thereof. The installation port 63a is a tubular space having a circular cross section into which a known ion chamber is inserted. The mounting tool 63a extends horizontally from one side of the ion chamber mounting plate 63 to the inside of the ion chamber mounting plate 63.

14A, 14B, 14C and 15A, 15B, and 15C are diagrams for explaining various uses of the heterogeneous phantom for measuring radiation dose according to an embodiment of the present invention.

Referring to FIG. 14A, the first plate 39, the second plate 41, the ion chamber mounting plate 63, the second plate 41, the cork plate 51, and the space plate 53 are shown. ), The second plate 41, the teflon plate 49, and the fourth plate 45 are laminated in this order to form the plate stack 31.

As described above, the stacking order of the plate stack 31 and the type of plate applied are changed according to the required conditions. In addition, an ion chamber 69 is installed inside the installation port 63a of the ion chamber mounting plate 63.

When radiation is irradiated onto the plate stack 31 which is laminated as described above, the radiation moves downward in the reverse order. That is, the radiation passing through the fourth plate 45 passes through the teflon plate 49 and passes through the second plate 41, and then passes through the space part 53a and the cork plate 51 to the other second plate 41. After passing, the ion chamber 69 is reached.

The ion chamber 69 detects the dose of irradiated radiation and informs the worker of its contents. In the drawing, the radiation dose sensed by the ion chamber 69 is radiation having energy corresponding to the dose of radiation after passing through the general tissues of the human body and bones and lung tissues.

Similarly, referring to FIG. 14B, after the radiation passes through the fourth plate 45, the cork plate 51, the teflon plate 49, and the space plate 53 pass through the second plate 41 to support the TLD. It can be seen that the plate 61 has been reached. The thermal fluorescence detector 67 distributed over the entire surface of the TLD support plate 61 stores the dose of radiation at the corresponding position and informs the user through a known method.

The stacked pattern as described above is of course designed to correspond to the configuration of the heterogeneous tissue in the body surrounding the target site to be irradiated.

14C, it can be seen that the film 71 is interposed between the first plate 39 and the second plate 41. Accordingly, the film 71 passes through the fourth plate 45, the cork plate 51, the fourth plate 45, the teflon plate 49, the space plate 53, and the two second plates 41 in this order. One radiation arrives.

The film 71 is subsequently developed to indicate the planar level of radiation energy at the depth at which the film is located.

The above-mentioned third plate 43, cork plate 55, Teflon plate 57 and titanium plate 59 were applied to the plate stack 31 shown in FIGS. 15A, 15B and 15C. As an ion chamber 69, a thermal fluorescence detector 67 and a film 71 were provided, respectively.

15A, 15B, and 15C, the stacked structure of each plate laminate 31 is combined to correspond to the tissue structure surrounding the site to be irradiated as described with reference to FIG. Therefore, the pattern combination of the laminated structure of the plate laminated body 31 may vary innumerably.

In particular, in the plate laminate 31 shown in Figs. 15A, 15B, and 15C, the cork plate 55, the Teflon plate 57, or the titanium plate 59 do not cover the entire surface of the plate laminate 31 partially. Since the part of the radiation reaches the radiation dose measuring instrument directly through the fourth plate 45, the third plate 43, etc., it is possible to grasp the planar energy distribution in the plane.

The present invention has been described in detail through specific embodiments, but the present invention is not limited to the above embodiments, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. .

The non-homogeneous phantom for radiation dose measurement of the present invention made as described above has a simple structure and low cost, and in particular, by applying a plurality of plate members having a tissue density corresponding to the density of a tissue of a predetermined part in the human body, all depths in the body And it is possible to accurately predict the radiation dose at the site and using these results can be used for the purpose of quality control, such as radiation therapy device, as well as has an effect that can be applied to other experiments to evaluate the human heterogeneous effect.

Claims (7)

By taking the radiation irradiated from the radiation emitter and measuring its dose, By stacking a plurality of unit plates having a predetermined thickness and passing the radiation irradiated from the outside, having an electron density corresponding to the tissue density of a predetermined part of the body so that the radiation is the same as the energy level after passing through a predetermined part of the body tissue. A plate laminate comprising the plate; Measuring means installed at a desired position of the plate stack and measuring an energy level of radiation passing through a unit plate; Heterogeneous phantom for radiation dose measurement comprising a frame for supporting the plate stack. The method of claim 1, Each unit plate is a square plate of the same width, an acrylic plate made of acrylic, a teflon plate made of Teflon, a cork plate made of cork, and an acrylic penetrating the center part except the edge portion thereof. And a space plate for providing a space in the center, wherein at least one kind of unit plate is selectively used in the plate laminate, and at least one kind of unit plate is used. Homogeneous phantom for volume measurement. The method of claim 1, The unit plate is a square acrylic plate, At least one acrylic plate is a non-homogeneous phantom for radiation dose measurement, characterized in that at least one through hole for providing a space therein. The method of claim 3, wherein The inhomogeneous phantom for radiation dose measurement, characterized in that the through hole of the acrylic plate is selected one of the cork plate, Teflon plate, titanium plate of a predetermined thickness is inserted. The method according to any one of claims 1 to 4, The measuring means is an acrylic plate having a predetermined thickness, the TLD support plate having a plurality of receiving grooves formed on one side thereof, and a radiation dose meter (TLD) inserted into each of the receiving grooves. Inhomogeneous phantom for measurement. The method according to any one of claims 1 to 4, The measuring means is an acrylic plate having a predetermined thickness, and an ion chamber mounting plate having an installation hole for inserting and installing a tubular ion chamber therein, and an ion chamber inserted and mounted in the installation hole. Homogeneous phantom for volume measurement. The method of claim 1, The frame; An upper frame positioned on the upper part of the plate stack and covering the upper edge of the plate stack; A lower frame positioned below the plate stack and supporting a lower edge of the plate stack; And a connector that connects the upper frame and the lower frame and presses the upper frame and the lower frame in a direction proximate to each other.