TWI504381B - Diagnostic apparatus using radiation - Google Patents

Description

Radiation diagnostic device

The present invention relates to a radiation diagnostic apparatus for performing inspection of a subject by a radiation beam (fan beam) having a fan shape.

A radiation diagnostic apparatus that irradiates a subject with radiation such as X-rays for measurement or imaging, in order to appropriately measure the measurement range of the subject, and to reduce radiation outside the measurement range, it is necessary to accurately position the irradiation range of the subject with respect to the radiation.

Therefore, for example, the conventional X-ray bone mineral content (bone density) measuring apparatus disclosed in Fig. 12 depicts the outer circumference 112 and the center line 114 outside the measurement range on the top plate 110 of the main body unit 100.

In the apparatus, the main body unit 100 is inserted under a bed called a bucky stand (see, for example, FIG. 3), and the subject lying on the photographing table, for example, X-rays from the body portion 100. The generator irradiates a vertically slit-shaped rectangular slit-shaped X-ray beam extending in the longitudinal direction of the detecting portion 120, and detects the transmitted beam by the detecting portion 120 located above the main body portion 100 (and the subject). By moving the X-ray generator and the detecting unit 120 in a direction perpendicular to the slit surface, measurement of the entire area in the measurement range can be performed. The operator, for example, identifies the circumference 112 and the centerline 114 outside the measurement range by the transparent top plate of the movable bed, and positions the subject in the measurement range.

Patent Document 1 discloses a method in which an operator recognizes the position of a flat-plate type X-ray detector located under a top plate, and a light-emitting member is disposed on the upper surface of the X-ray detector, and a radiographic apparatus that transmits the top plate of the light is used.

The MRI (Nuclear Magnetic Resonance Imaging) device disclosed in Patent Document 2 has an LED that emits fan-shaped planar light in the lumen of the device, and displays the position of the MRI photographing surface by the intersecting line of the LED light and the patient.

Further, for example, in the bone density measuring apparatus using X-rays, X-rays that expand from the shape of the X-ray generator fan are transmitted through the subject (for example, Patent Document 1).

[Previous Technical Literature]

[Patent Literature]

(Patent Document 1) Japanese Patent Laid-Open Publication No. 2005-296499

(Patent Document 2) Japanese Patent Publication No. 2005-517487

(Patent Document 3) Japanese Patent Laid-Open Publication No. 2000-116636

When the radiation beam of the fan shape is irradiated from the radiation generator, since the beam width varies depending on the distance from the radiation generator, the object pair is used when a beam such as a rectangular slit shape having no change in beam width is used. Correct positioning of the beam illumination range is difficult to achieve. For example, the height of the photographing table varies, and the beam width at the height of the subject lying on the photographing table varies depending on the height of the photographing table. Therefore, even if the range of the beam is displayed on the top plate of the radiation generator, it is impossible to understand the beam width at the height of the subject from the range, so that it is difficult to perform the positioning of the measurement site of the subject in accordance with the beam width. Achieved.

It is an object of the present invention to easily perform positioning of a subject on an irradiation range of a fan beam of radiation.

A radiation diagnostic apparatus according to the present invention includes: a radiation generator that irradiates a fan beam of radiation; and a radiation detector that detects the fan beam at intervals in the radiation generator; In the first direction in which the sector surface is perpendicular, a connection member that connects the radiation generator to the radiation detector is provided on one side of the irradiation range of the fan beam of the radiation generator, and the other side is inserted and disposed in order to insert the subject Since the radiation generator is disposed between the radiation detector and the radiation detector, the radiation generator and the radiation detector are kept open, and the other side of the irradiation range of the fan beam of the radiation generator is When the connecting member is viewed in one direction, the connecting member has a shape in which the shape of the sector of the fan beam is displayed, a display, or a three-dimensional shape.

One aspect is that the joining member has a light-emitting display as a display that displays the shape of the sector.

Another aspect further includes an illumination control unit that controls the illumination state of the illumination display according to the state of the radiation diagnostic apparatus.

In another aspect, the illuminating display has a plurality of illuminating elements arranged from the radiation generator toward the radiation detector, the radiation diagnosing device further having a second illuminating control unit that starts to illuminate according to the fan beam The elapsed time causes the position of the illuminator in the plurality of illuminating elements to move from the radiation generator toward the radiation detector or in the opposite direction.

According to the present invention, the position of the subject can be easily performed on the irradiation range of the fan beam.

1 to 4 are diagrams showing an X-ray bone mineral content measuring device 10 which is an example of the radiation diagnostic apparatus of the present invention. Here, a device for measuring the bone mineral content of the human lumbar vertebra is taken as an example, but the X-ray bone mineral content measuring device 10 and the radiation diagnostic device of the present invention are not limited to such a device.

Figs. 1 and 2 show schematic views of the X-ray bone mineral content measuring device 10 viewed obliquely from above and below. 3 is a front view of the X-ray bone mineral content measuring device 10 for inserting the camera table 30 into the body portion 12 from the front side (i.e., the open end side of the insertion table) toward the support arm 16. Fig. 4 is a view showing the position of the lumbar vertebra 42 of the subject 40 and the fan beam emitted from the X-ray generator 20 when the subject 40 (inspected person) is lying on the photographing table 30 in the state of Fig. 3. Positional relationship diagram. The following description refers to Figs. 1 to 4 as appropriate.

As shown in these figures, the X-ray bone mineral content measuring device 10 is basically constituted by the main body portion 12, the detecting portion 14, and the supporting arm portion 16 that connects the two.

The X-ray generator 20 is housed in the body portion 12. The X-ray generator 20 (refer to FIG. 4) is disposed under the top plate 13 of the body portion 12. A wheel 11 for movement is provided at a lower portion of the main body portion 12. By the wheels 11, the operator pushes the X-ray bone mineral content measuring device 10, and the body portion 12 can be inserted under the photographing table 30 (for example, refer to the third portion). Figure and Figure 4). The shape of the main body portion 12 of the present example viewed from directly above is a rectangle, and the direction indicated by the arrow A in the figure parallel to one side of one of the rectangles is referred to as the "front-rear direction" of the device. The front-rear direction A is also a direction perpendicular to a sector plane (a plane of a sector) perpendicular to the fan beam 22 radiated from the X-ray generator 20 toward the detecting portion 14 (the outline of the sector shape is indicated by a broken line in the figure). Further, in the front-rear direction A, the direction toward the support arm portion 16 viewed from the fan beam 22 is referred to as "rear direction" for convenience, and the opposite direction is referred to as "front direction". Further, a direction parallel to the side perpendicular to the front-rear direction A from the side of the rectangular portion of the main body portion 12 is referred to as a "left-right direction", and is indicated by an arrow B in the drawing. The left-right direction B is perpendicular to both the front-rear direction A and the vertical direction.

A height adjustment mechanism is provided in the main body portion 12, but the drawing is omitted, and the height of the entire X-ray bone mineral content measuring device 10 can be adjusted by the mechanism. That is, the mechanism can move the main body portion 12 and the detecting portion 14 up and down while maintaining the interval therebetween.

The X-ray generator 20 has a general structure of an X-ray tube and a collimator that defines an irradiation range of X-rays radiated from the X-ray tube. The X-ray generator 20 is thin slit-shaped radiation in the front-rear direction A, and is radiated in the left-right direction B by the fan beam 22 that is diffused from the X-ray tube toward the upper fan shape. The X-ray generator 20 of the present example is located at the center of the main body portion 12 in the left-right direction B, and is movable in the front-rear direction A. That is, in the present example, a scanning mechanism for moving the X-ray generator 20 in the front-rear direction A is housed in the main body portion 12, and the X-ray generator 20 is moved in the front-rear direction A by the scanning mechanism to form a fan shape. The beam 22 is scanned along a direction A that is perpendicular to its sector. The first figure shows the outline of the range in which the intersection of the fan beam 22 and the top surface of the top plate 13 is moved by scanning, with a rectangle 19. The rectangle 19 can also be actually depicted on the top plate 13. At this time, the operator can refer to the rectangle 19 drawn by the operator to position the subject 40 on the imaging table 30 to the illumination range of the fan beam 22.

The support arm portion 16 extends from one end portion of the body portion 12 in the front-rear direction A to directly above. In the present example, the surface 17 on the top plate 13 side of the support arm portion 16 becomes a surface perpendicular to the front-rear direction A. The support arm portion 16 cantileverly supports the detecting portion 14.

The detecting portion 14 is disposed directly above the main body portion 12 at a distance from the top plate 13 of the main body portion 12. The detecting portion 14 is cantilevered by the supporting arm portion 16, and protrudes from the upper end of the supporting arm portion 16 toward the top plate 13 in the forward direction, partially or entirely covering the top plate 13. The surface of the bottom plate 15 of the detecting portion 14 is parallel to the surface of the top plate 13 of the body portion 12. The X-ray detector (not shown) is built in the detecting unit 14. In performing the bone mineral content measurement, the X-ray detector has a linear array in which a plurality of X-ray detecting elements are aligned along the left-right direction B. The width in the left-right direction B of the X-ray detector is, for example, greater than the width in the left-right direction B of the fan beam 22 at the height of the X-ray detector. In this example, a scanning mechanism that moves the X-ray detector in the front-rear direction A is built in the detecting portion 14. The scanning mechanism moves the X-ray detector in synchronization with the scanning mechanism in the main body portion 12 so that the X-ray detector comes to a position corresponding to the position of the X-ray generator 20 in the front-rear direction A in the main body portion 12. Thereby, the fan beam 22 irradiated from the X-ray generator 20 can be detected by the X-ray detector in the detecting portion 14 even at any scanning position.

In the X-ray bone mineral content measuring device 10 of Fig. 1, the main body portion 12 and the detecting portion 14 are arranged vertically in parallel with each other, and the ends of the both sides in the front-rear direction A and the direction side are supported by the arm portion 16. link. Further, the end portion on the side of the front side of the main body portion 12 and the detecting portion 14 is not provided with a support arm, and is an open end. The X-ray bone mineral content measuring device 10 is inserted into the photographing stage 30 from the open end side.

As shown in Fig. 3, the X-ray bone mineral content measuring device 10 is inserted into the imaging table 30 at a right angle to the longitudinal direction of the imaging table 30 (the connecting head portion of the subject when lying horizontally and the body axis direction of the toe). In this state, the left-right direction B of the X-ray bone mineral content measuring device 10 is parallel to the longitudinal direction of the imaging table 30. Further, in this state, the top plate of the photographing table 30 is sandwiched between the main body portion 12 and the detecting portion 14. The top plate of the table 30 can also be made of a transparent or translucent material, and a display (rectangular 19, etc.) indicating the scanning range of the fan beam 22 drawn on the top plate 13 of the body portion 12 can be seen.

As shown in Fig. 4, the subject 40 is placed on the top plate of the photographing table 30 along the longitudinal direction of the photographing table 30, that is, along the left-right direction of the X-ray bone mineral content measuring device 10. In the example of Fig. 4, the subject 40 is lying on its back in a state in which the head is directed in the right direction of the figure. In this state, the positional relationship between the subject 40 and the X-ray bone mineral content measuring device 10 needs to be adjusted so that the lumbar vertebra 42 of the subject 40 to be measured enters the range of the fan beam 22.

Therefore, the X-ray bone mineral content measuring device 10 is provided on the top plate 13 side of the support arm portion 16, that is, a pair of indicator lines 18 are provided on the front surface side surface 17 (see FIGS. 1 to 3). A pair of indicator lines 18 display the outlines on the left and right sides of the fan beam 22 radiated from the X-ray generator 20. That is, when the surface 17 of the support arm portion 16 is viewed from the front side (open end) of the X-ray bone mineral content measuring device 10 toward the rear direction, the fan beam 22 passes between the pair of indicator lines 18.

The form of the indicator line 18 is not limited as long as it represents the outline of the sector of the fan beam 22. That is, for example, the surface 17 may be painted with a paint, or the surface 17 may be attached to a sticker.

The operator inserts the X-ray bone mineral content measuring device 10 into the imaging table 30 as shown in Fig. 4, for example, in a state where the subject 40 is lying on the imaging table 30. Then, by observing the surface 17 of the support arm portion 16 from the front side of the X-ray bone mineral content measuring device 10, it is judged whether or not the lumbar vertebra 42 portion of the subject 40 to be measured is just between the pair of indicator lines 18. When the portion of the lumbar vertebra 42 is offset from the range between the pair of indicator lines 18 to the left or right direction in the drawing, the operator shifts the X-ray bone mineral content measuring device 10 to the left or right, or moves the subject. 40. The position of the lumbar vertebra 42 can be accurately incorporated between a pair of indicator lines 18. Further, the lumbar vertebra 42 of the subject 40 sometimes protrudes from the pair of indicator lines 18 to the left and right due to the height of the photographing table 30, or otherwise the lumbar vertebra 42 is entirely enclosed between the pair of indicator lines 18 and left on both sides. Void. In any of the above cases, the bone mineral content of the lumbar vertebra 42 cannot be accurately measured. In the latter case, the portion outside the measurement object of the subject 40 is subjected to radiation increase. In this case, the operator moves the entire X-ray bone mineral content measuring device 10 up and down by the height adjusting mechanism of the main body portion 12, so that the lumbar vertebra 42 can be accurately incorporated between the pair of indicator lines 18. Further, in addition to the height adjustment mechanism, the height of the photographing table 30 may be adjusted instead of adjusting the height of the X-ray bone mineral content measuring device 10.

Thus, the example shown in FIGS. 1 to 4 discloses a pair of indicator lines 18 on the front surface 17 of the support arm portion 16, which indicates that the fan beam 22 is projected in the back and forth direction A in the rear direction. The outline of the time. By the indicator line 18, the operator can adjust the positional relationship between the subject 40 and the X-ray bone mineral content measuring device 10, and the measurement target portion (lumbar vertebra 42) of the subject 40 can be accurately incorporated into the fan beam 22. .

Additionally, the extent to which the fan beam 22 is represented by a pair of indicator lines 18 is merely an example. For example, it may be replaced by a method in which the entire range (trapezoidal) is represented by a color different from the outside of the range except for the outline of the range of the fan beam 22.

Further, as shown in Fig. 5, the shape of the sector surface of the fan beam 22 can be displayed when the shape of the support arm portion 16A itself is viewed from the front direction of the X-ray bone mineral content measuring device 10 in the rear direction.

Further, as shown in FIG. 6, the indicator line indicating the range of the fan beam 22 may be represented by a row 50 of light-emitting elements 52 such as LEDs. That is, the example of Fig. 6 is on the surface 17 of the support arm portion 16, and a plurality of light-emitting elements 52 are arranged along the right and left contour lines of the sector faces of the fan beam 22. These light-emitting elements 52 receive power from the power source in the X-ray bone mineral content measuring device 10 to emit light. Since the surface 17 will form the shadow of the inspection portion 14 and is generally dark, the indicator line is thus represented by the row 50 of light-emitting elements 52, which is convenient for the operator to view.

In addition, the light-emitting element 52 may also use a light-emitting element that can switch the light-emitting color (for example, an LED having a plurality of different colors in the element, such that one or more of the LEDs is a selective light-emitting body), and the light-emitting color of the column 50 is expressed. The state of the X-ray bone mineral content measuring device 10. For example, an example is to express the state to be measured (the alignment of the X-ray bone mineral content measuring device 10 and the subject 40 between them) and the measurement state (in the X-ray irradiation) by the luminescent color of the light-emitting element 52. )Wait. The operation sequence of the X-ray bone mineral content measuring device 10 at this time can be, for example, shown in Fig. 7.

That is, in the sequence of Fig. 7, after the X-ray bone mineral content measuring device 10 is inserted into the imaging table 30, the operator carries the subject 40 on the imaging table 30 (S10). Next, when the operator presses the preparation measurement switch on the operation panel (not shown) of the X-ray bone mineral content measuring device 10, the control device in the X-ray bone mineral content measuring device 10 (the drawing is omitted) Each of the light-emitting elements 52 of the column 50 emits light of a first color (for example, green) (S12). The operator views the indicator line of the first color indicated by the light-emitting elements 52 from the front direction of the X-ray bone mineral content measuring device 10, and the measurement portion of the body axis direction of the subject 40 (Fig. 4) In the example, the lumbar vertebra 42 is accurately incorporated into the inner side of the fan beam 22, and the relative positional relationship between the subject 40 and the X-ray bone mineral content measuring device 10 in the up-down direction and the left-right direction is adjusted (S14). When the positional relationship adjustment is completed, the operator instructs the X-ray bone mineral content measuring device 10 to start the measurement by turning on the start measurement switch or the like on the operation panel. The control device in the X-ray bone mineral content measuring device 10, according to the instruction, causes the X-ray generator 20 to illuminate the fan beam 22, and causes the X-ray detector in the detecting portion 14 to detect the fan beam passing through the subject 40. 22 (S16). When the fan beam 22 is scanned in the front-rear direction A, the control device controls the scanning mechanism in the main body portion 12 and the inspection portion 14 to move the X-ray generator 20 in the front-rear direction A in synchronization with the X-ray detector. In the X-ray irradiation, each of the light-emitting elements 52 of the column 50 emits light of a second color (for example, yellow) (S18).

In the above, the two device states of "preparation measurement" and "measurement" are expressed by the light-emitting state of the color of the light-emitting element 52. However, other device states may be expressed by other light-emitting states of the light-emitting elements 52. . For example, in the measurement (in X-ray irradiation), when an error occurs in the X-ray bone mineral content measuring device 10, the type of the error may be expressed by the light-emitting state of the light-emitting elements 52. The example of Fig. 8 shows the type of error by the temporal flicker pattern of the illuminating element 52. For example, when the X-ray tube enters the non-irradiation period, the control device in the X-ray bone mineral content measuring device 10 flashes the light-emitting element 52 in a blinking pattern of turning off the light and extinguishing the light every second in yellow, and the tube of the X-ray tube is flashed. When an abnormality occurs in the voltage, it flashes in a flashing pattern that is turned on for one second to turn off the light for two seconds.

Further, by individually controlling the light emission of the left and right side rows 50, more light emitting states can be expressed, but the drawings are omitted. For example, it is possible to express only three states in the case where the left side row 50 emits light, the case where only the right side row 50 emits light, and the case where the both rows 50 are illuminated. A plurality of states can be represented by combining the illuminating colors of the columns 50 and the scintillation patterns of the columns 50. The operating state (operation mode, etc.) and the error state of the X-ray bone mineral content measuring device 10 can be expressed by such various light-emitting states.

Further, the elapsed time from the start of the measurement can also be indicated by the position of the illuminator in the illuminating elements 52. The example of Fig. 9 is before the measurement (preparation of the measurement state), and the control device in the X-ray bone mineral content measuring device 10 causes all of the light-emitting elements of the column 50 to emit light in green. When the measurement (irradiation of X-rays) is started, the light-emitting elements 52 on the lower side of the column 50 are sequentially illuminated in yellow in accordance with the passage of time. For example, after the measurement is started, only the light-emitting elements 52 at the lowermost side of the left and right side columns 50 are illuminated in yellow. Thereafter, the control device sequentially lights the light-emitting element 52 from the bottom in accordance with the passage of time. For example, at half the stage during the measurement, the light-emitting elements 52 from the lower end of the column 50 to the center are illuminated in yellow, and at the end of the measurement period, all of the light-emitting elements 52 from the lower end to the upper end are illuminated. By means of such an elapsed time, the operator can obtain a reference to what extent the measurement period has passed.

In the example of FIG. 6 and the like, the column 50 for displaying the left and right contours of the fan beam 22 is provided on the support arm portion 16, but the planar light-emitting portion for displaying the trapezoidal range of the fan beam 22 may be provided on the support arm portion 16. Replace.

Further, in the example of Fig. 10, the column 60 of the light-emitting elements is disposed on the side surface of the inspection portion 14 along the front-rear direction A, thereby displaying the scanning position of the fan beam 22. That is, the example is to control the light-emitting elements in the X-ray bone mineral content measuring device 10 by only the light-emitting elements of the light-emitting elements on the column 60 corresponding to the positions (scanning positions) of the sector faces of the fan beams 22. To display the scan position. The operator can know the scanning position in the measurement by the display.

The example of Fig. 11 is on the surface 17 of the support arm portion 16, and in addition to the column 50 of the light-emitting elements 52 showing the range of the fan beam 22, the light-emitting element row 70 in the horizontal direction and the light-emitting element column in the vertical direction are provided. An example of 75.

The light-emitting element row 70 in the horizontal direction shows the reference height of the plane on the photographing stage 30. The reference height is defined as a width in the left-right direction of the measurement target portion (lumbar vertebra 42) of the subject 40 and the fan beam 22 when the plane above the imaging table 30 coincides with the reference height. The width matches. The operator views the positional relationship between the light-emitting element row 70 and the plane above the imaging table 30 from the front side of the X-ray bone mineral content measuring device 10 to confirm whether the height of the plane on the photographing table 30 matches the reference height, and the photographing table. 30 is whether the X-ray bone mineral content measuring device 10 is relatively inclined (whether the plane above the photographing table 30 is horizontal). Then, when the height is not consistent or inclined, the operator can adjust the height or the inclination of the X-ray bone mineral content measuring device 10 or the photographing table 30 to make the upper plane of the photographing table 30 along the light-emitting element column. 70.

The light-emitting element row 75 in the vertical direction extends along a center line in the left-right direction B of the surface 17 of the support arm portion 16 upward from the reference height displayed by the light-emitting element row 70, and has a constant height range. The light-emitting element row 75 is used to determine the body thickness of the subject 40. That is, the thicker the body thickness of the subject 40, the more the amount of X-rays transmitted through the subject 40 is attenuated. Therefore, in the case of measuring the bone mineral content of the subject 40 which is thicker than the standard body thickness, it is required. Enhance the intensity of X-rays, etc., for the measurement mode of people with thicker body thickness. Therefore, in the example of Fig. 11, the body thickness of the standard measurement mode or the threshold for the thicker body is expressed by the light-emitting element array 75. The operator views the surface 17 from the front side of the X-ray bone mineral content measuring device 10, and if the light-emitting elements of the light-emitting element row 75 are not covered by the subject 40, the X-ray bone mineral content is determined. The measurement mode of device 10 is switched to be used for thicker body thicknesses.

The embodiments are described above, but the present invention is not limited to the various embodiments described above, and various modifications, improvements, and the like can be made within the scope of the invention described in the claims.

For example, in each of the above examples, the front surface 17 of the support arm portion 16 is perpendicular to the front-rear direction A, but it is not essential. Even if the surface 17 is not perpendicular to the front-rear direction A, the indicator lines 18 and 50 are oriented parallel to the left and right sides of the fan beam 22 from the front side of the X-ray bone mineral content measuring device 10 toward the rear. When projected on the surface 17, the line through which the contours are projected through the surface 17 may be used as the indicator line 18 or the column 50.

Further, the above measurement targets are exemplified by the lumbar vertebrae, but the above-described examples can be applied even in the case of measuring the situation or the device of other parts such as the femur. Further, in addition to the bone mineral content measuring device, any of the above-described examples can be applied to any device that needs to accurately position the fan beam of the radiation to the target portion of the subject.

Further, the above example is that the X-ray generator 20 is below and the X-ray detector is above, but the arrangement relationship between the two may be reversed. In addition, the above example can be applied even if the arrangement relationship between the two is not up and down.

10. . . X-ray bone mineral content measuring device

11. . . wheel

12. . . Body part

13. . . roof

14. . . Detection department

15. . . Bottom plate

16, 16A. . . Support arm

17. . . surface

18. . . Indicator line

19. . . rectangle

20. . . X-ray generator

twenty two. . . Fan beam

30. . . Camera station

40. . . Subject

42. . . Lumbar spine

50. . . Column

52. . . Light-emitting element

60. . . Column

70. . . Light-emitting element column

75. . . Light-emitting element column

100. . . Body part

110. . . roof

112. . . Peripheral line

114. . . Center line

120. . . Detection department

A. . . Front and rear direction

B. . . Left and right direction

S10-S18. . . step

Fig. 1 is a schematic view showing an X-ray bone mineral content measuring apparatus for drawing a fan-shaped display line on a support arm portion as an example of an embodiment of the present invention viewed obliquely from above.

Fig. 2 is a schematic view showing the X-ray bone mineral content measuring apparatus of Fig. 1 viewed obliquely from below.

Fig. 3 is a schematic view showing that the main body portion of the X-ray bone mineral content measuring device of Fig. 1 is inserted into the lower portion of the photographing table when viewed from the front side.

Fig. 4 is an explanatory view showing the positional relationship between the X-ray fan beam and the subject (lumbar spine).

Fig. 5 is a schematic view showing an X-ray bone mineral content measuring device in which the support arm portion is fan-shaped as viewed from the front side.

Fig. 6 is a schematic view showing an X-ray bone mineral content measuring device in which a light-emitting element row in which a fan shape is displayed in a support arm portion is viewed from the front side.

Fig. 7 is a flow chart showing the measurement operation using the apparatus of Fig. 6.

Fig. 8 is a view showing a state of light emission of a column of light-emitting elements according to an error type.

Fig. 9 is a view showing a state of light emission in which the light-emitting element rows are switched in accordance with the elapse of the measurement time.

Fig. 10 is a schematic view showing an X-ray bone mineral content measuring apparatus having a light-emitting element row showing a scanning position of a fan beam.

Fig. 11 is a schematic view showing an X-ray bone mineral content measuring device having a light-emitting element row for displaying a reference surface of a photographing table and a light-emitting element row for determining the thickness of a subject, viewed from the front side.

Fig. 12 is a schematic view showing a conventional X-ray bone mineral content measuring device.

10. . . X-ray bone mineral content measuring device

11. . . wheel

12. . . Body part

13. . . roof

14. . . Detection department

16. . . Support arm

17. . . surface

18. . . Indicator line

19. . . rectangle

twenty two. . . Fan beam

A. . . Front and rear direction

B. . . Left and right direction

Claims (4)

A radiation diagnostic apparatus comprising: a radiation generator that irradiates a fan beam of radiation; and a radiation detector that detects the fan beam at intervals in the radiation generator; In the first direction in which the sector surface is perpendicular, a connection member that connects the radiation generator to the radiation detector is provided on one side of the irradiation range of the fan beam of the radiation generator, and the other side is inserted and disposed in order to insert the subject Since the radiation generator is disposed between the radiation detector and the radiation detector, the radiation generator and the radiation detector are kept open, and the other side of the irradiation range of the fan beam of the radiation generator is When the connecting member is viewed in one direction, the connecting member has a shape in which the shape of the sector of the fan beam is displayed, a display, or a three-dimensional shape. A radiation diagnostic apparatus according to claim 1, wherein the connecting member has a light-emitting display as a display for displaying the shape of the sector. The radiation diagnostic apparatus according to claim 2, further comprising an illumination control unit that controls an illumination state of the illumination display according to a state of the radiation diagnostic apparatus. The radiation diagnostic apparatus of claim 2, wherein the illuminating display has a plurality of illuminating elements arranged from the radiation generator toward the radiation detector, the radiation diagnosing device further having a second illuminating control unit The time elapsed after the fan beam starts to be illuminated, and the position of the illuminator in the plurality of illuminating elements is moved from the radiation generator toward the radiation detector or in the opposite direction.