JP2012040072A - Portable radiation image detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable radiation image detector capable of suppressing a rise in the surface temperature of a contact housing with an examinee in addition to the temperature rise of FPD even in the case of long-time operation without losing handleability.SOLUTION: The housing 26 of an electronic cassette 13 comprises two housings of a main housing 28 in which the FPD 30 is housed and a sub-housing 29 in which a battery unit 27 for feeding power to the FPD 30 is housed. The sub-housing 29 is connected to the main housing 28 in a freely revolvable manner at one end part thereof through a hinge 31 and arranged at a housing position in a state that one end part on the side opposite to the hinge 31 of the sub-housing 29 approaches the main housing 28. The sub-housing 29 is revolved on the hinge 31 in a direction wherein one end part on the side opposite to the hinge 31 is separated from the main housing 28. By this constitution, the heat transferred to the main housing 28 from the sub-housing 29 is reduced.

Description

  The present invention relates to a portable radiological image detection apparatus that detects a radiographic image by receiving radiation that has passed through a subject.

  In the medical field, an X-ray imaging apparatus using radiation, for example, X-rays, is known for performing image diagnosis. The X-ray imaging apparatus includes an X-ray source that generates X-rays and an X-ray image detection apparatus that detects an X-ray image by receiving X-rays generated by the X-ray source and transmitted through a subject. As an X-ray image detection apparatus, an X-ray sensitive layer is arranged on a TFT (Thin film transistor) active matrix substrate, and irradiated X-rays representing image information of a subject (patient, etc.) undergoing an X-ray examination. Those using an FPD (flat panel detector) that converts the intensity distribution of the image into digital image data have been put into practical use. The X-ray image detection apparatus is a stationary type in which an FPD is built in an upright photographing stand for photographing a subject in a standing posture or a standing photographing stand for photographing a subject in a prone posture. In addition to the above, a portable X-ray image detection apparatus (hereinafter also referred to as “electronic cassette”) in which an FPD is built in a flat, substantially rectangular parallelepiped cassette type casing has been developed.

  The electronic cassette is used to shoot parts that are difficult to shoot with the stationary type (for example, joints such as elbows and knees), and the subject who is difficult to move to the photographic room is laid on the bed in the patient's room It can be used for shooting in a wheelchair in an emergency. In preparation for imaging, the electronic cassette and the subject are positioned relative to each other by applying the electronic cassette to the subject's imaging region and adjusting the posture of the subject according to the position and orientation of the electronic cassette ( Positioning). If a power cable or a communication cable is attached to the electronic cassette, positioning is difficult and the degree of freedom in positioning also decreases. Therefore, a wireless electronic cassette has been proposed that can be driven by a battery and wirelessly communicates with an external device such as a console so that a power cable and a communication cable are not required (for example, patents). References 1-3).

  In a wireless type electronic cassette, a battery is housed in a housing, but the battery generates a large amount of heat. Therefore, in the electronic cassettes described in Patent Documents 1 to 3, measures are taken to suppress a temperature rise due to heat generated by the battery of the FPD accommodated in the housing. The FPD has a drive circuit that drives an active matrix substrate, and a signal processing circuit that reads an image signal from the active matrix substrate and processes the read image signal. In particular, since the signal processing circuit causes noise when the temperature rises, it is necessary to take measures to suppress the temperature rise.

  Patent Document 1 describes an additional function module including a battery, a cooling element for cooling the signal processing circuit, and a heat radiating plate for radiating heat inside the housing to the outside. The electronic cassette is detachably attached to the casing or connected to the casing by a cable. The additional function module is used, for example, when performing moving image shooting that consumes more power and generates more heat than still image shooting, and suppresses the temperature rise of the FPD by a cooling element or a heat sink. In addition, the electronic cassettes described in Patent Documents 2 and 3 suppress a local temperature increase in the casing by distributing a plurality of batteries arranged in the casing around the FPD.

JP 2008-83031 A JP 2008-170212 A JP 2009-104043 A

  As described in Patent Document 1, in moving image shooting, since the amount of heat generated per unit time is longer and the operation time is longer than in still image shooting, the temperature is higher than that of an electronic cassette that performs only still image shooting. Measures to suppress the rise are required.

  In addition, in the case of moving image shooting, it is highly necessary to consider not only the temperature of the FPD but also the surface temperature of the housing. This is because the surface of the electronic cassette housing and the body of the subject are in contact with each other at the time of imaging, so the subject is painful when the surface temperature of the housing is high, and the subject's pain is This is because the longer the contact time is, the larger the time is, and in moving image shooting, it is required to keep the surface temperature of the housing as low as possible as compared to still image shooting.

  As in the electronic cassettes described in Patent Documents 2 and 3, if the batteries are distributed in the casing, a local temperature increase of the casing can be avoided, so that an effect of suppressing the temperature increase of the FPD can be expected. However, since the heat generated by the battery is radiated to the outside through the casing, it is difficult to keep the surface temperature of the casing in contact with the subject low.

  The electronic cassette described in Patent Document 1 can also be expected to have an effect of suppressing the temperature rise of the FPD by using an additional function module with a cooling element. However, since the heat absorbed by the cooling element is dissipated through the housing when the additional function module is arranged in the housing, the subject contacts the electronic cassette as described in Patent Documents 2 and 3. It is difficult to keep the surface temperature of the housing low. In addition, this method leads to an increase in the size of the casing and an increase in weight due to securing the installation space for the cooling device. Since portable electronic cassettes are required to be smaller and lighter than stationary types, it is not preferable to increase the size and weight of the housing.

  Further, as described in Patent Document 1, if the additional function module with a battery that generates a large amount of heat is not provided in the casing, but connected to the casing with a cable, an effect of suppressing the surface temperature of the casing can be expected. However, in this method, there arises a problem that the handling property obtained by wirelessly changing the electronic cassette is impaired.

  In Patent Documents 1 to 3, only the problem of suppressing the temperature rise of the FPD in the casing is described, and the problem of reducing the suffering of the subject caused by the increase of the surface temperature of the casing is clearly indicated or suggested. There is no consideration.

  The present invention has been made in view of the above problems, and an object of the present invention is to improve the temperature of the FPD, in addition to the rise in the temperature of the FPD, even when operated for a long time without impairing the handleability. It is an object of the present invention to provide a portable radiological image detection apparatus capable of suppressing an increase in surface temperature.

  The portable radiological image detection apparatus of the present invention includes a detection unit that receives radiation irradiated through a subject and detects a radiographic image, a main housing that houses the detection unit, and a battery that supplies power to the detection unit. It is a sub-housing to be accommodated, and is connected to the main housing, and maintains one state where power can be supplied to the detection unit, and the one end from the housing position close to the main housing. And a sub-case that is displaceable in a direction away from the main case.

  Displacement of the sub housing that houses the battery with respect to the main housing prevents the heat of the sub housing from being transmitted to the main housing. Thereby, the temperature rise of the temperature in the main housing or the surface temperature of the main housing is suppressed. Further, since the sub housing is connected to the main housing, it can be handled as one body with the main housing, so that the handling property is not impaired.

  The main housing and the sub-housing have a substantially rectangular irradiation surface that receives the irradiation of radiation and a back surface opposite to the irradiation surface in a state where the sub-housing is in the storage position. It is preferable that it is a flat substantially rectangular parallelepiped shape which has a surface and four side surfaces arrange | positioned along four sides of the said back surface.

  The sub-housing is preferably displaced in a plane parallel to the irradiation surface and the back surface. Moreover, it is preferable that the heat insulating material is arrange | positioned at the surface by the side of the said irradiation surface among the outer peripheral surfaces of the said sub housing | casing.

  The sub-housing may be attached to the main housing so as to be rotatable, or may be attached to the main housing so as to be slidable.

  The sub-housing preferably has an elongated shape with a long side extending along one side of the main housing at the storage position.

  It is preferable that a heat insulating material is disposed at a boundary between the main housing and the sub housing approaching at the storage position.

  On the outer peripheral surface of the main casing exposed to the outside when the sub casing is displaced in a direction away from the main casing, a slit for discharging the air in the main casing to the outside to dissipate heat is provided. Preferably it is formed.

  It is preferable that a signal processing unit that reads a signal representing the radiographic image from the detection unit is provided, and the signal processing unit is disposed near the slit.

  A plurality of the sub-housings may be provided. In addition, when there are two first and second sub-casings, both the first and second sub-casings have rotation centers arranged at one corner of the main housing. Also good. Further, when there are a plurality of sub-casings, a position detection unit that detects whether each of the plurality of sub-casings is in the storage position, and the storage according to the detection result of the position detection unit. It is preferable to include a control unit that performs control so that the battery in the sub-casing that is not located is used preferentially.

  It is preferable that the detection unit is capable of shooting a moving image. It is preferable that wireless transmission means for wirelessly transmitting the radiation image detected by the detection unit to the outside is provided, and the wireless transmission means is accommodated in the sub casing in addition to the battery.

  According to the present invention, the sub-housing containing the battery is movably connected to the main housing containing the detection unit while maintaining a state where power can be supplied to the detection unit, so that the handling property is not impaired. In addition to the increase in the temperature of the FPD, a portable radiographic image detection device that can suppress the increase in the surface temperature of the housing that the subject contacts can be provided even when operated for a long time.

It is the schematic which shows the structure of a X-ray imaging system. It is a perspective view of a supine photography stand. It is a perspective view which shows the electronic cassette (portable radiographic image detection apparatus) of this invention. It is a block diagram which shows the structure of FPD. It is explanatory drawing which shows the outline of the electrical structure of an electronic cassette. It is explanatory drawing which shows the positional relationship of an electronic cassette and a subject at the time of imaging | photography of a knee. It is explanatory drawing which shows the positional relationship of an electronic cassette and a subject at the time of image | photographing an elbow. It is sectional drawing of the electronic cassette which provided the heat insulating material in the outer peripheral surface. It is sectional drawing of the electronic cassette which provided the heat insulating material and the heat sink on the outer peripheral surface. It is a perspective view of the electronic cassette of another embodiment. It is sectional drawing of the electronic cassette shown in FIG. It is sectional drawing which shows the slit for ventilation | gas_flowing. It is a top view of the electronic cassette of FIG. It is a top view of the electronic cassette of a comparative example. It is explanatory drawing of the electronic cassette which has two sub housing | casings. It is explanatory drawing of the priority setting function of a battery. It is explanatory drawing of the electronic cassette with which the sub housing | casing was slidably connected. It is explanatory drawing of the electronic cassette which provided the wireless communication part in the sub housing | casing.

[First embodiment]
As shown in FIG. 1, an X-ray imaging system 10 includes an X-ray generator 11, a lying position imaging table 12, an electronic cassette 13 that is a portable radiographic image detection device of the present invention, a console 14, and a monitor 15. And. The X-ray generator 11 emits X-rays toward the subject H placed on the supine imaging table 12 based on the irradiation start signal input from the console 14. The electronic cassette 13 receives X-ray irradiation transmitted through the subject H, detects an X-ray image representing the image information of the subject H, and transmits X-ray image data to the console 14. The electronic cassette 13 can shoot moving images as well as still images. The console 14 performs various types of image processing on the X-ray image received from the electronic cassette 13 and displays the image on the monitor 15.

  The recumbent photographing stand 12 is provided with a tray 21 to which an electronic cassette 13 is attached. In the X-ray imaging system 10, imaging is performed with the electronic cassette 13 attached to the tray 21, and imaging sites (such as elbows and knee joints) that are difficult to capture with the electronic cassette 13 attached to the tray 21. As shown in FIG. 2, the electronic cassette 13 is removed from the tray 21, and the electronic cassette 13 is placed on the recumbent photographing table 12, and the electronic cassette 13 and the subject H are positioned to perform photographing. Is called.

  As shown in FIG. 2, the X-ray generator 11 operates an X-ray tube 11 a that emits X-rays, a collimator 11 b that is an irradiation field limiter that limits an X-ray irradiation range (irradiation field), and these components. It consists of the operation part 11c. The X-ray generator 11 is held, for example, on a support column that is movable and telescopically installed on the ceiling of the X-ray imaging room, and is disposed above the supine imaging table 12.

  The recumbent photographing stand 12 includes a top plate 16 and a photographing stand main body 17 provided under the top plate 16. The top plate 16 has a rectangular shape having a length and a width with which the subject H can lie down, and is arranged on the imaging base body 17 so that the top surface on which the subject H is placed is horizontal. . The top plate 16 is made of carbon or the like having a high X-ray transmittance.

  The photographic stand main body 17 includes a top plate support part 20, a tray 21, and an elevating part 22. The top plate support unit 20 includes a floating mechanism (not shown) that supports the top plate 16 so as to be movable in the XY directions. The floating mechanism includes a manual type in which an operator manually moves the top plate and an automatic type in which the operator automatically moves the top plate using an electric mechanism or the like. In this embodiment, the floating type is an automatic type. In addition, an operation panel 23 for operating the top support 20 is provided on the front side of the supine position stand 12 when the operator performs a photographing operation on the supine position stand 12.

  The tray 21 is provided below the top plate 16 and between the top plate support portions 20. The tray 21 can be pulled out from under the top plate 16 by pulling a handle 21 a provided on the front side to the front side. The tray 21 is moved in the X direction by a slide mechanism (not shown). The slide mechanism includes a manual type and an automatic type as in the above-described floating mechanism, but is an automatic type in this embodiment. The operation panel 23 is also used for the operation of the slide mechanism.

  The elevating unit 22 includes a top plate 16, an electric elevating mechanism (not shown) for elevating the top plate support unit 20 and the tray 21, and a telescopic bellows type cover 22 a that covers the periphery of the elevating mechanism. Yes. This lifting mechanism is also operated by the operation panel 23.

  As shown in FIG. 3, the electronic cassette 13 includes an FPD 30 (detection unit) and a casing 26 that houses the FPD 30. A lead plate 72 that absorbs X-ray backscattered rays is disposed on the back side of the FPD 30, and a circuit board 73 is disposed on the back side of the lead plate 72 (see FIG. 11).

  The casing 26 has a flat and substantially rectangular parallelepiped shape, and has a substantially rectangular irradiation surface 26a that receives radiation irradiation, a back surface 26b on the opposite side, and four along the four sides of the irradiation surface 26a and the back surface 26b. It has two side surfaces 26c. The housing 26 includes a main housing 28 that houses the FPD 30 and a sub housing 29 that functions as a battery holder that houses a battery unit 27 that supplies power to the FPD 30. The space in which the FPD 30 is housed and the space in which the battery unit 27 is housed are separated by being partitioned by the wall surfaces of the main housing 28 and the sub housing 29.

  The main housing 28 is a main part of the housing 26 in which the FPD 30 is accommodated, and has a flat and substantially rectangular parallelepiped shape like the housing 26. The upper surface and the lower surface of the main housing 28 are substantially rectangular, and constitute an irradiation surface 26a and a back surface 26b of the housing 26, respectively. The main housing 28 is formed of a case body made of stainless steel or aluminum having a region corresponding to the detection surface (surface on which X-rays are incident) of the FPD 30 and a material (such as carbon) that can transmit X-rays. It consists of a flat plate that is fitted into the opening of the main body and constitutes the irradiation surface 26a.

  The sub housing 29 has an elongated rectangular tube shape, and the length in the long side direction is substantially the same as the long side of the main housing 28. The sub housing 29 is rotatably connected to the main housing 28. The hinge 31 having the rotation shaft 31 a is a connecting portion that connects the sub housing 29 and the main housing 28. The hinge 31 connects one end portion in the long side direction of the sub housing 29 and one corner portion of the main housing 28. The rotation shaft 31a extends in the thickness direction of the main housing 28 (the direction from the irradiation surface 26a toward the back surface 26b), and the sub housing 29 is parallel to the irradiation surface 26a and the back surface 26b with the rotation shaft 31a as the rotation center. It can rotate freely in a plane. For this reason, it is possible to rotate the sub casing 29 in a state where the casing 26 is placed on the top plate 16 with the irradiation surface 26a facing upward.

  As shown in FIG. 3A, the initial position of the sub housing 29 is one side surface 29 a in the long side direction, which is a part of the peripheral surface of the sub housing 29, and one of the peripheral surfaces of the main housing 28. It is a storage position where one side 28a in the long side direction which is a part faces. The side surfaces 28a and 29a form a boundary between the main housing 28 and the sub housing 29 and come into contact with each other at the storage position. And in the storage position, since the side surfaces 28a and 29a are mutually covered, they are not exposed to the outside. In the storage position, the shape of the entire casing 26 including the main casing 28 and the sub casing 29 is substantially a rectangular parallelepiped shape.

  In the storage position shown in FIG. 3 (A), the sub housing 29 has one end opposite to the hinge 31 close to the main housing 28, and rotates from the storage position about the rotation shaft 31a as a fulcrum. As shown in FIG. 3B, one end portion on the opposite side to the hinge 31 is displaced in a direction away from the main housing 28.

  When the sub housing 29 rotates, the side surface 28a of the main housing 28 and the side surface 29a of the sub housing 29 are not in contact with each other, and both are exposed to the outside. As the angle at which the sub housing 29 rotates increases, the area exposed to the outside on the side surface 28a increases. The maximum value (maximum angle) of the rotation angle with respect to the storage position of the sub housing 29 is, for example, about 90 °, and when the sub housing 29 rotates to the maximum angle, the side surface 29a of the sub housing 29 The side surface 28a of the main housing 28 is almost orthogonal. The sub housing 29 can be stopped at any position within the range of the maximum angle from the storage position.

  In addition, the power supply wiring from the battery unit 27 in the sub casing 29 to the main casing 28 is inserted into the hinge 31, and the sub casing 29 maintains the power supply state while maintaining the main casing. It rotates with respect to the body 28.

  The sub housing 29 is made of, for example, a plastic material. The sub housing 29 holds the battery unit 27 in a detachable manner. On one end face in the long side direction of the sub housing 29, a take-out port 35 for taking out and attaching the battery unit 27 from the sub housing 29 is formed. A substantially rectangular tube-shaped storage chamber corresponding to the shape of the battery unit 27 is formed in the back of the take-out port 35.

  The battery unit 27 is a battery pack that houses a plurality of batteries 58 (see FIG. 5) having a power supply capacity capable of capturing a plurality of still images and moving images. The battery 58 is a rechargeable secondary battery, and can be charged by connecting the battery unit 27 to a charger such as a cradle.

  Reference numeral 40 denotes an indicator 40 that displays a power on / off state of the electronic cassette 13, a communication state, a remaining amount of the battery unit 27, and the like. The indicator 40 includes an indicator lamp composed of a plurality of LEDs, a liquid crystal panel, and the like.

  As shown in FIG. 4, the FPD 30 is configured by laminating a charge generation layer that absorbs X-rays and converts them into charges on a TFT active matrix substrate 43. The charge generation layer is made of amorphous a-Se (amorphous selenium) containing, for example, selenium as a main component (for example, a content rate of 50% or more). When X-rays are irradiated, the charge corresponding to the irradiated X-ray dose By generating a certain amount of charge (electron-hole pairs) internally, the irradiated X-rays are converted into charges. Of course, the FPD 30 may be an indirect conversion type in which X-rays are converted into visible light after being converted into visible light by a scintillator.

  On the TFT active matrix substrate 43, a large number of pixels 44 each having a storage capacitor for storing the charge generated in the charge generation layer and a TFT for reading out the charge stored in the storage capacitor are arranged in a matrix. These pixels 44 constitute a detection surface for detecting incident X-rays. Charges generated in the charge generation layer in accordance with the amount of X-rays incident on the detection surface are accumulated in the storage capacitors of the individual pixels 44. Thereby, the image information of the subject H carried by the X-rays incident from the irradiation surface 26 a is converted into charge information and held on the TFT active matrix substrate 43.

  The TFT active matrix substrate 43 has a plurality of gate wirings 45 extending in a certain direction (row direction) for turning on and off the TFT gates of the individual pixels 44, and a direction orthogonal to the gate wiring 45 (column direction). A plurality of data wirings 46 are provided for reading out stored charges from the storage capacitors via the TFTs that are extended and turned on. Individual gate lines 45 are connected to a gate driver 47, and individual data lines 46 are connected to a signal processing unit 48. When charges are accumulated in the storage capacitors of the individual pixels 44, the TFTs of the individual pixels 44 are sequentially turned on in units of rows by a signal supplied from the gate driver 47 through the gate wiring 45, and the TFTs are turned on. The charge accumulated in the storage capacitor of the pixel 44 is transmitted as a charge signal through the data wiring 46 and input to the signal processing unit 48.

  The signal processing unit 48 includes an amplifier and a sample hold circuit provided for each data line. The charge signal transmitted through each data line is amplified by the amplifier and then held in the sample hold circuit. In addition, a multiplexer and an A / D converter are connected in order to the output side of the sample and hold circuit, and the charge signals held in the individual sample and hold circuits are input to the multiplexer in order (serially) for A / D conversion. The digital image data is converted by the device. Image data output from the A / D converter of the signal processing unit 48 is sequentially stored in the image memory 49 shown in FIG. The image memory 49 has a storage capacity capable of storing a plurality of X-ray images.

  As shown in FIG. 5, a control unit 53, a power supply circuit 52, an operation unit 54, and a wireless communication unit 59 are provided in the main casing 28 of the electronic cassette 13 in addition to the FPD 30. The control unit 53 is a CPU that controls the entire electronic cassette 13, a ROM that stores a program executed by the CPU, and a work memory that is used for the CPU to execute a process by developing a program loaded from the ROM. The microcomputer includes a RAM and an EEPROM that stores various setting information. The operation unit 54 includes a power button and the like.

  The power supply circuit 52 includes a DC-DC converter that converts a voltage supplied from the battery unit 27 into a voltage required by each unit of the electronic cassette 13, and supplies power from the battery unit 27 to each unit of the electronic cassette 13. . Further, the power supply circuit 52 outputs the voltage level supplied by the battery unit 27 to the control unit 53. The control unit 53 detects the remaining amount of each battery unit 27 based on the voltage value output from the power supply circuit 52, and operates each indicator 40 so as to display the detected remaining amount. For example, when the voltage value falls below the threshold value, the control unit 53 determines that the remaining amount has run out, and causes each indicator 40 to display that effect.

  The wireless communication unit 59 is a communication unit that communicates with the console 14 and includes an antenna and a communication circuit that generate radio waves for communication. The wireless communication unit 59 receives control signals such as an X-ray irradiation start signal and an irradiation time from the console 14, and transmits image data in the image memory 49 to the console 14. Note that the wireless communication unit may be an optical communication unit such as an infrared ray.

  In the case of still image shooting, the electronic cassette 13 receives an X-ray irradiation start signal from the console 14 through the wireless communication unit 59, operates the FPD 30 in accordance with the timing, and displays an image of one X-ray image. Data is temporarily stored in the image memory 49. The wireless communication unit 59 transmits the image data read from the image memory 49 to the console 14. When a plurality of still images are taken continuously, the above operation is repeated.

  In the case of moving image shooting, X-rays are continuously or intermittently pulsed from the X-ray tube 11a (see FIG. 2) during shooting, and the FPD 30 repeats the X-ray image detection operation at a predetermined frame rate. The detected plurality of X-ray images are sequentially written in the image memory 49 according to the frame rate, transmitted to the console 14 by the wireless communication unit 59, and displayed on the monitor 15 in real time.

  The effect | action by the said structure is demonstrated referring FIG.6 and FIG.7. When the electronic cassette 13 is attached to the imaging stand, it is difficult to take an image, and when photographing an elbow or knee joint, the positioning of the subject H and the electronic cassette 13 on the top plate 16 of the supine position imaging stand 12 is performed. Is done. As shown in FIG. 6, when photographing the knee, the electronic cassette 13 is placed between the top plate 16 and the leg of the subject H lying on the top plate 16 with the irradiation surface 26 a facing upward. Inserted between. The position of the leg is adjusted so that the leg of the subject H is positioned approximately at the center of the main housing 28. As shown in FIG. 7, when photographing the elbow, the arm of the subject H is placed on the electronic cassette 13 placed on the top 16. The position of the arm is adjusted so that the elbow comes to approximately the center of the main housing 28.

  As shown in FIGS. 6A and 7A, in the case of still image shooting for shooting several X-ray images, shooting is performed with the sub housing 29 set in the storage position. Is called. The internal temperature of the main casing 28 rises due to the heat generated by the FPD 30, particularly the heat generated by the A / D converter of the signal processing unit 48 that generates a large amount of heat. Along with this, the surface temperature of the main casing 28 with which the legs and arms of the subject H are in contact increases. The internal temperature of the sub casing 29 also increases due to the heat generated by the battery unit 27, and the surface temperature of the sub casing 29 also increases accordingly.

  Since the heat generation of the battery unit 27 is larger than the heat generation of the FPD 30, the surface temperature of the sub housing 29 is higher than the surface temperature of the main housing 28. In the storage position, since the side surface 29a of the sub housing 29 is in contact with the main housing 28a, the heat generated by the battery unit 27 is transmitted from the sub housing 29 to the main housing 28 through the side surfaces 28a and 29a. The surface temperature of the main housing 28 rises due to heat transmitted from the sub housing 29 in addition to the heat generated by the FPD 30.

  The surface temperatures of the main housing 28 and the sub housing 29 rise according to the operation time of the FPD 30. In the case of still image capturing for capturing several X-ray images, the operation time of the FPD 30 is short, and therefore the rise in the surface temperature of the main housing 28 is relatively small. Therefore, the subject H who puts his legs and arms on the surface of the main housing 28 does not feel pain.

  Further, if the operation time is short, the temperature rise of the signal processing unit 48 in the main housing 28 is small. Moreover, since the space in the main housing 28 and the space in the sub housing 29 are separated by the respective wall surfaces, the battery unit 27 is compared with the conventional technology in which the FPD and the battery unit are arranged in one space. Is less affected by the temperature rise of the signal processing unit 48. Therefore, no noise is generated due to the temperature rise of the signal processing unit 48.

  The main casing 28 and the sub casing 29 generate heat while the FPD 30 is operating, but the heat is dissipated to the atmosphere through the respective outer peripheral surfaces that are in contact with the atmosphere. For this reason, even when a plurality of images are taken, if the images are taken at intervals, the heat dissipation proceeds during a photography pause period in which the amount of heat generated per unit time decreases, so the temperature of the main casing 28 and the sub casing 29 The rise is relatively small.

  On the other hand, in the case of performing moving image shooting or continuous shooting for shooting a plurality of still images without intervals, as shown in FIG. 6B, the sub casing 29 is moved from the storage position to the sub casing 29. When the one end portion rotates in a direction away from the main housing 28, the side surface 28a of the main housing 28 and the side surface 29a of the sub housing 29 that are facing each other at the storage position are separated from each other, and the side surfaces 28a, 29a are separated. Is exposed to the outside. In the case of moving image shooting or continuous shooting, since the operation time of the FPD 30 is long, the temperature rise of the surface temperature of the main casing 28 and the sub casing 29 is larger than that of several still images.

  However, by rotating the sub-case 29, the contact area between the main case 28 and the sub-case 29 is reduced compared with the case where the sub-case 29 is in the storage position. Since the amount of heat transferred to the housing 28 is reduced, an increase in the surface temperature of the main housing 28 is suppressed.

  Further, as the rotation angle of the sub housing 29 increases and the space between the side surface 29a of the sub housing 29 and the side surface 28a of the main housing 28 increases, the amount of air flowing between the side surfaces 29a and 28a increases. The amount of heat transfer from the sub housing 29 to the main housing 28 through the atmosphere is also reduced, and an increase in the surface temperature of the main housing 28 is suppressed.

  Even if the amount of heat transfer from the sub housing 29 to the main housing 28 decreases, the surface temperature of the main housing 28 rises due to the heat generated by the FPD 30. However, since the FPD 30 generates less heat than the battery unit 27, the surface temperature of the main housing 28 does not reach the temperature at which the subject H feels painful. Therefore, the subject H who puts his / her legs on the main housing 28 does not feel pain even when the imaging time is long.

  Further, since the increase in the temperature of the signal processing unit 48 of the main casing 28 is suppressed due to the decrease in the heat transfer amount from the sub casing 29, no noise is generated due to the temperature increase of the signal processing unit 48.

  Further, when the sub housing 29 is rotated, the side surfaces 28a and 29a are exposed to the outside, so that substantially the entire peripheral surfaces of the main housing 28 and the sub housing 28 are exposed to the outside. Compared with the case where the sub housing 29 is in the storage position, the external exposed areas of the outer peripheral surfaces of the main housing 28 and the sub housing 29 are increased. For this reason, since the area which contacts air | atmosphere increases, the heat dissipation effect also goes up.

  Further, the surface temperature of the sub housing 29 is higher than the surface temperature of the main housing 28, but when the sub housing 29 rotates, the sub housing 29 and the main housing 28 in contact with the body of the subject H are in contact with the sub housing 29. Since the space | interval of the housing | casing 29 opens, there is also little possibility that the subject's H body contacts the sub housing | casing 29. FIG.

  Furthermore, since the sub casing 29 and the main casing 28 are connected to each other via a hinge 31 that is a connecting portion, both can be handled as a unit. For this reason, compared with the prior art which connects an electronic cassette and the additional function module with a built-in battery via a cable like patent document 1, the favorable handling property obtained by the wireless conversion of the electronic cassette 13 is not impaired. .

  Even when the sub housing 29 is rotated away from the main housing 28, the connection through the hinge 31 is maintained between the sub housing 29 and the main housing 28, so that the hinge 31 is provided. In order to suppress heat transfer through the connected portion, a material having low thermal conductivity is used as a material constituting the connected portion to enhance the heat insulation effect, or a heat insulating material other than the hinge 31 is provided at the connected portion. It is preferable to take measures for heat insulation.

[Second Embodiment]
As shown in FIG. 8, the heat insulating material 61 may be provided on the upper surface constituting the irradiation surface 26 a and the side surface 29 a serving as a boundary surface with the main housing 28 at the storage position, among the outer peripheral surfaces of the sub-housing 29. . The heat insulating material 61 has an L-shaped cross section, and a portion disposed on the upper surface and a portion disposed on the side surface 29a are integrally formed. As a material of the heat insulating material 61, a material having a low thermal conductivity such as urethane or polystyrene is used.

  Since the upper surface of the sub-housing 29 is located on the irradiation surface 26a side of the housing 26, the possibility of coming into contact with the body of the subject H is higher than the lower surface and side surfaces on the back surface 26b side. By providing the heat insulating material 61 on the upper surface of the sub housing 29, an increase in the surface temperature of the upper surface of the sub housing 29 is suppressed. Therefore, even when the body of the subject H comes into contact with the upper surface of the sub-housing 29, it is safer than when the heat insulating material 61 is not provided.

  Since the side surface 29 a of the sub housing 29 is a surface that contacts the side surface 28 a of the main housing 28 in the storage position, even if the sub housing 29 is rotated in a direction away from the main housing 28, the main housing 28. Like the top surface, the side surface 29a is also concerned about contact with the body of the subject H. Therefore, the safety is further improved by providing the heat insulating material 61 on the side surface 29a.

  Further, since the side surface 29a serves as a boundary surface with the main casing 28 at the storage position, the heat transfer from the sub casing 29 to the main casing 28 can be suppressed by providing the heat insulating material 61.

  The heat insulating material disposed between the main housing 28 and the sub housing 29 is provided on the side surface 28 a of the main housing 28 from the viewpoint of suppressing heat transfer from the main housing 28 to the sub housing 29. It may be. However, in consideration of the safety when the subject H comes into contact with the side surface 29a of the sub housing 29 that is hotter than the main housing 28, it may be provided on the side surface 29a of the sub housing 29 as in this example. preferable. Of course, the heat insulating material 61 may be provided on both the side surface 28 a of the main housing 28 and the side surface 29 a of the sub housing 29.

  When the heat insulating material 61 is provided on the outer peripheral surface of the sub housing 29, the heat dissipation efficiency of the sub housing 29 is lowered. Therefore, as shown in FIG. 9, a heat radiating plate 62 may be provided on the lower surface of the sub housing 29. The heat radiating plate 62 is made of a material having high thermal conductivity such as metal. The heat radiating plate 62 has a convex portion that enters the sub housing 29 and comes into thermal contact with the outer peripheral surface of the battery unit 27 in the sub housing 29. Since the heat generated by the battery unit 27 is radiated to the outside of the sub casing 29 through the heat radiating plate 62, a high heat radiating effect is obtained. Since the lower surface of the sub housing 29 is located on the back surface 26b side, there is no concern that the body of the subject H will come into contact with the temperature of the heat radiating plate 61 located on the lower surface compared to the other surfaces of the sub housing 29. It is safe even if the price increases.

  In this example, the heat radiating plate 62 is provided only in the sub housing 29, but in addition to this, a heat radiating plate may be provided on the lower surface of the main housing 28. Thereby, the temperature rise of the signal processing part 48 in the main housing | casing 28 is further suppressed.

[Third Embodiment]
The electronic cassette 66 shown in FIG. 10 is disposed on the outer peripheral surface of the main casing 67 exposed to the outside when the sub casing 68 comes into contact with the storage position and the sub casing 68 is separated from the main casing 67 to the outside. A slit 71 functioning as a vent hole for discharging air is formed. By providing the slit 71, the heat dissipation effect of the main casing 67 is improved, and the temperature rise of the signal processing unit 48 can be further suppressed. Since the electronic cassette of the following embodiment including the electronic cassette 66 of the present embodiment is basically the same as the electronic cassette 13 of the above-described embodiment, the same parts are denoted by the same reference numerals and the differences are described. The explanation is centered.

  The electronic cassette 66 includes a main case 67 and a sub case 68, and a case 69 is formed. The case 69 has a flat, substantially rectangular parallelepiped shape. As shown in FIG. 10A, the sub housing 68 has a long and narrow shape extending along one side of the main housing 67, and the side end portion of the housing 69 is the same as the electronic cassette 13 in the storage position. Placed in. As shown in FIG. 10B, the sub casing 68 is connected to the main casing 67 by a hinge having a rotation axis 70 at one end in the long side direction, and is a plane parallel to the irradiation surface 69a and the back surface 69b. The rotary shaft 70 is rotatable around the rotary shaft 70. Similar to the electronic cassette 13, when the sub casing 68 is in the storage position, one end portion on the side opposite to the rotation shaft 70 approaches the main casing 67, and rotates about the rotation shaft 70. The opposite end is separated from the main casing 67.

  The main casing 67 and the sub casing 68 are slightly different in shape from the electronic cassette 13 of the above embodiment, and the thickness of the sub casing 68 is about half that of the main casing 67. A storage recess for storing the sub-casing 68 is formed at the end of the main casing 67. The housing recess is formed in an L-shaped cross section by cutting out from the side surface of the main housing 67 to the lower surface on the back surface 69b side. The orthogonal surfaces 67a and 67b of the storage recesses face and come into contact with the upper surface and side surfaces of the sub housing 68 when the sub housing 68 is stored. A slit 71 is formed in a surface 67 b facing the upper surface of the sub housing 68.

  When the sub housing 68 is in the storage position, the slit 71 is closed by the sub housing 68. When the one end of the sub housing 68 shown in FIG. 10B rotates away from the main housing 67 from the state where the sub housing 68 shown in FIG. The exposed surface 67b is exposed. The case where the sub casing 68 is rotated to expose the slit 71 to the outside is when performing moving image shooting or continuous shooting that requires a high heat dissipation effect. Since the high-temperature air in the main casing 67 is released to the outside through the slit 71, a higher heat dissipation effect can be obtained as compared with the case without the slit 71.

  The slit 71 is closed when the sub casing 68 is in the storage position, but the sub casing 68 is in the storage position when shooting several still images and the main casing 67 generates heat. Therefore, there is no problem even if there is no heat dissipation effect by the slit 71.

  Further, as shown in FIG. 11, in order to further suppress the temperature rise of the signal processing unit 48, the signal processing unit 48 may be arranged in the vicinity of the slit 71 in the main housing 67.

  Although the slit 71 is useful for improving the heat dissipation of the main casing 67, there is a concern that light enters the main casing 67 from the slit 71. The approach of light becomes a problem when an indirect conversion type FPD that converts the X-rays into visible light with a scintillator and photoelectrically converts the converted visible light with a photodiode is used as the FPD 30. This is because if light entering from the slit 71 is detected by the photodiode, it causes an artifact in the X-ray image.

  Therefore, when the slit 71 is provided, it is preferable to take a light shielding measure against the FPD 30. As shown in FIG. 11, on the back side of the FPD 30, there is a lead plate 72 that absorbs X-ray backscattered rays, and on the back side of the lead plate 72 is a circuit board 73 on which a control unit 53 and a power supply circuit 52 are formed. Be placed.

  The lead plate 72 is formed in an L shape so as to surround the end of the FPD 30 on the slit 71 side. Since the lead plate 72 has a light shielding property, as indicated by a cross, the light entering the slit 71 formed on the surface 67b and traveling toward the FPD 30 is blocked, and the FPD 30 is shielded. If the lead plate 72 that absorbs backscattered rays is used as a light shielding member as in this example, there is no need to provide a dedicated light shielding member, which is advantageous in terms of cost and the number of parts.

  However, as long as the cost and the number of parts are not increased, a dedicated light shielding member 74 may be used in the vicinity of the slit 71 as shown in FIG. The light blocking member 74 has a substantially U-shaped cross section, and is disposed at a position facing the slit 71 in the main housing 67. The tongue pieces formed at both end edges of the slit 71 protrude toward the light shielding member 74, and together with the light shielding member 74, a communication path from the slit 71 toward the inside of the main housing 67 is formed in a crank shape. As a result, as shown by the x mark, the light entering from the slit 71 is blocked by the light blocking member 74, while the air flow through the slit 71 is allowed.

  As described above, the slit 71 has an advantage of improving heat dissipation. On the other hand, in the case of an indirect conversion type FPD, it is necessary to take a light shielding measure. Since it increases, it is not preferable. Therefore, like the electronic cassette 66, the slit 71 is preferably provided at a position that is covered when the sub housing 68 is in the storage position. In this way, as in the case of moving image shooting or continuous shooting, a sufficient effect is exhibited when a high heat dissipation effect is required, while an increase in cost and the number of parts can be suppressed, which is optimal.

  In FIG. 13, unlike the electronic cassette 13 of the first and second embodiments, the rotation shaft 70 of the sub housing 68 is arranged in the width direction (short side) of the sub housing 68 as in the electronic cassette 66 of the third embodiment. Direction), the sub casing 68 is preferably narrower in width (on the opposite side of the interface with the main casing 67). The electronic cassette 76 of the comparative example shown in FIG. 14 includes a main casing 77 and a sub casing 78 as in the electronic cassette 66, and the only difference is the width of the sub casing 78. Like the electronic cassette 76, the sub casing 78 may be wide. However, if the width is wide, there is a disadvantage as described below.

  The width W2 of the sub casing 78 of the electronic cassette 76 is larger than the width W1 of the sub casing 68 of the electronic cassette 66. As shown in FIGS. 13 (B) and 14 (B), even when the body size and position of the subject H placed on the irradiation surface are the same, the sub-casings 68 and 78 are respectively attached to the subject H. The rotation angle when rotating to a position that avoids contact with the body is such that the rotation angle α of the narrow sub-casing 68 is smaller than the rotation angle β of the wide sub-casing 78. . Depending on the shape of the hinge connecting the sub housing and the main housing, the rotation angle of the sub housing may not be large. The width of the sub housing is preferably narrow so that the rotation angle for avoiding the body of the subject H may be small.

[Fourth Embodiment]
In the above embodiment, there is one sub-housing that accommodates the battery unit 27, but a plurality of sub-housings may be used as in the electronic cassette 81 shown in FIG. The electronic cassette 81 includes two sub-housings 83 and 84 that respectively accommodate the battery units 27, and the sub-housings 83 and 84 are rotatably attached to the main housing 82.

  If there are two battery units 27, the battery capacity is increased compared to the case of one, so that it can be driven for a longer time, and hot swap (hot-swap) function to replace the battery while starting up the electronic cassette It becomes possible to cope with. If the hot swap function is provided, when one battery unit 27 runs out of power and needs to be replaced, power is supplied from the other battery unit 27, so the electronic cassette 81 remains powered on. The out-of-volume battery unit 27 can be replaced. Since it is not necessary to turn off the power supply for battery replacement, restarting is unnecessary, and quick battery replacement is possible.

  In the electronic cassette 81, the rotation axes of the two sub cases 83 and 84 are arranged at one corner of the main case 82. As shown in FIG. 15B, in the electronic cassette 81, a slit 71 similar to the electronic cassette 66 of the above-described embodiment is formed in the storage recess in which the sub-housings 83 and 84 are stored. When the two sub-cases 83 and 84 are rotated in a direction away from the main case 82, the slits 71 of the storage recesses of the sub-case 83 and the sub-cases are provided near two orthogonal side surfaces of the main case 82. The slits 71 in the 84 storage recesses are respectively exposed. Therefore, air flows in the diagonal direction of the main casing 82 inside the main casing 82 as indicated by arrows. Since the air flowing in the diagonal direction crosses the FPD 30, it is possible to efficiently dissipate the FPD 30.

  As shown in FIG. 16, when two sub-casings 83 and 84 are provided, it is detected whether or not each sub-casing 83 and 84 is in the storage position, and the storage position is determined according to the detection result. Control may be performed so that the battery unit of the sub-casing that is not present is used preferentially.

  The power supply circuit 52 is provided with a selector 52 a that selects each power supply path from the battery unit 27 in the sub-housings 83 and 84. The selector 52a is controlled by the control unit 53. Reference numeral 86 denotes a position detector that detects whether or not the sub-housings 83 and 84 are in the storage position. The position detection unit 86 is configured by, for example, a micro switch or a photo sensor. When one of the sub cases 83 and 84 is in the storage position and the other is not in the storage position, the control unit 53 operates the selector 52a to supply power from the battery unit 27 in the sub case that is not in the storage position. Select a route.

  As described above, when the sub housing is not in the storage position and the sub housing is rotating in a direction away from the main housing 82, the heat of the sub housing is not easily transmitted to the main housing 82, and the main housing An increase in the surface temperature of the body 82 is suppressed. In accordance with the detection result of the position detection unit 86, the control unit 53 automatically selects the battery unit of the sub casing that is not in the storage position, so that an increase in the surface temperature of the main casing 82 is minimized.

  When both the sub housings 83 and 84 are in the storage position or when both are not in the storage position, the control unit 53 switches the two power feeding paths alternately by the selector 52a so that the usage amount of each battery unit is reduced. Control to be the same, or preferentially use the battery unit with the less remaining amount. In the present embodiment, the example in which two sub-casings are provided has been described, but two or more sub-casings may be provided.

[Fifth Embodiment]
In the above-described embodiment, the sub-housing is rotated with respect to the main housing. However, the electronic cassettes 91 and 92 shown in FIGS. The sub housing may slide. An electronic cassette 91 shown in FIG. 17A includes a main casing 91a and an elongated sub casing 91b disposed along the long side direction of the main casing 91a. The sub housing 91b is slidably attached to the side surface in the long side direction of the main housing 91a. The length in the longitudinal direction of the sub housing 91b is the same as the length in the long side direction of the main housing 91a. When the sub housing 91b is in the storage position, the side surface in the long side direction of the main housing 91a The side surfaces in the long side direction of the casing 91b face each other.

  When the sub casing 91b is slid, the sub casing 91b moves along the long side of the main casing 91a. One end portion in the long side direction of the sub casing 91b, which has approached the main casing 91a at the storage position, is separated from the main casing 91a by movement. In addition, the outer peripheral surfaces of the main casing 91a and the sub casing 91b facing each other at the storage position have a reduced contact area with each other according to the amount of sliding, and an increased external exposed area exposed to the outside. As a result, heat transmitted from the sub housing 91b to the main housing 91a is reduced, so that the same effect as in the above-described embodiment in which the sub housing rotates is obtained.

  In the electronic cassette 92 shown in FIG. 17B, similarly to the electronic cassette 91, an elongated sub-housing 92b is disposed along the long side direction of the main housing 92a. The electronic cassette 92 has a sliding direction different from that of the electronic cassette 91, and the sub casing 92b is provided to be slidable in the short side direction of the main casing 92a. When the sub housing 92b slides, one end portion in the width direction (short side direction) of the sub housing 92b moves in a direction away from the main housing 92a. Even if it is slid in this way, the outer peripheral surfaces of the main casing 92a and the sub casing 91b that face each other in the storage position have a contact area that decreases according to the amount of sliding, and are exposed to the outside. Since the area increases, the same effect as the electronic cassette 91 can be obtained.

  In the above embodiment, with respect to how the sub casing is displaced with respect to the main casing, as in the electronic cassettes 13 and 66 shown in FIG. 3 and FIG. When rotating relative to the main casing in a plane parallel to the main casing, and when sliding the sub casing in a direction parallel to one side of the main casing as in the electronic cassettes 91 and 92 shown in FIG. Explained. Comparing the two, it is considered that both effects are comparable from the viewpoint of suppressing heat transfer from the sub housing to the main housing, but avoids contact between the body of the subject H and the sub housing. In view of the above, it is preferable to rotate the electronic cassettes 13 and 66.

  This is because the sub-case is easier to move away from the body of the subject H placed in the main case when rotating. When sliding like the electronic cassette 91, since the sub casing slides along the long side direction of the main casing, the distance between the main casing and one end of the sub casing is separated in the sliding direction. Does not leave in the short side direction. On the other hand, when rotating like the electronic cassettes 13 and 66, the distance between the main casing and the one end opposite to the end serving as the pivot of the sub casing is long. Separated in two directions: side direction and short side direction. Therefore, in the case of rotating, the sub-housing can be moved away from the body of the subject H, so that contact with the subject H is easily avoided.

  In the above embodiment, the rotation direction of the sub case has been described as an example of turning in a plane parallel to the irradiation surface and the back surface. However, the rotation is performed so that one end of the sub case jumps up to the irradiation surface side. It may be moved. Even in this case, the effect of suppressing heat transfer from the sub housing to the main housing can be expected. However, since one end of the sub-housing approaches the irradiation surface side where the body of the subject H exists, considering the viewpoint of avoiding contact between the body of the subject H and the sub-housing, It is preferable to rotate in a plane parallel to the irradiation surface and the back surface.

[Sixth Embodiment]
Further, when the sub case is rotated, instead of connecting the sub case and the main case with a single axis of rotation, the main case 97 and the sub case are arranged like an electronic cassette 96 shown in FIG. The body 98 may be connected by a universal joint 99 such as a ball joint, and the rotation direction may be freely changed, for example, by rotating in the Z direction other than in the XY plane parallel to the irradiation surface. In this way, the degree of freedom of changing the posture of the sub case is increased, and further, it is easy to avoid contact between the subject H and the sub case.

  Further, in the above-described embodiment, the example in which only the battery unit is accommodated in the sub-housing has been described, but components other than the battery unit may be accommodated. For example, the wireless communication unit 59 may be accommodated in the sub-case 98 like an electronic cassette 96 shown in FIG. It is better that there are few shields around the wireless communication unit 59 that cause communication failure. By providing the wireless communication unit 59 in the sub-case displaceable with respect to the main case 97, the position of the wireless communication unit 59 can be adjusted to a position where the communication state is good. The wireless communication unit 59 is particularly effective when an optical communication unit such as an infrared ray having higher directivity than radio waves is used. When combined with the universal joint 99, the posture of the sub casing 98 can be changed more freely, which is effective.

  In the above embodiment, the outer peripheral surfaces of the main housing and the sub housing facing each other when the sub housing is in the storage position may be arranged with a slight gap so as not to contact each other even in the storage position. Good. If it is not in contact, the heat transferred from the sub housing to the main housing is reduced, so that an increase in temperature of the main housing when the sub housing is in the storage position can be suppressed.

  Moreover, you may combine said each embodiment. In each of the above embodiments, X-rays have been described as an example of radiation. However, the present invention may use radiation other than X-rays, such as γ-rays. The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 10 X-ray imaging system 12 臥 position imaging stand 13,66,76,81,91,92,96 Electronic cassette (portable radiographic image detection apparatus)
26, 69 Housing 28, 67, 77, 82, 91a, 92a, 97 Main housing 29, 68, 78, 83, 84, 91b, 92b, 98 Sub housing 26a Irradiation surface 26b Rear surface 26c Side surface 27 Battery unit 30 FPD (detection unit)
48 Signal Processing Unit 59 Wireless Communication Unit 61 Heat Insulating Material 62 Heat Dissipating Plate 71 Slit 86 Position Detection Unit 99 Universal Joint

Claims (15)

A detection unit that detects radiation images by receiving radiation that has passed through the subject;
A main housing that houses the detection unit;
A sub-housing that houses a battery that supplies power to the detection unit, and is connected to the main housing, and is maintained from a state where one end is close to the main housing while maintaining a state where power can be supplied to the detection unit. A portable radiographic image detection apparatus comprising: a sub-housing that is displaceable in a direction in which the one end portion is further away from the main housing than the storage position.   The main housing and the sub-housing have a substantially rectangular irradiation surface that receives the irradiation of radiation and a back surface opposite to the irradiation surface in a state where the sub-housing is in the storage position. The portable radiographic image detection apparatus according to claim 1, wherein the portable radiographic image detection apparatus has a flat and substantially rectangular parallelepiped shape having a surface and four side surfaces arranged along four sides of the back surface.   The portable radiographic image detection apparatus according to claim 2, wherein the sub casing is displaced in a plane parallel to the irradiation surface and the back surface.   The portable radiographic image detection apparatus according to claim 2, wherein a heat insulating material is disposed on a surface on the irradiation surface side of the outer peripheral surface of the sub casing.   The portable radiographic image detection apparatus according to claim 1, wherein the sub-housing is rotatably attached to the main housing.   The portable radiographic image detection apparatus according to claim 1, wherein the sub casing is slidably attached to the main casing.   The portable radiographic image detection according to any one of claims 1 to 6, wherein the sub-housing has an elongated shape with a long side extending along one side of the main housing at the storage position. apparatus.   The portable radiographic image detection according to any one of claims 1 to 7, wherein a heat insulating material is disposed at a boundary between the main housing and the sub housing approaching at the storage position. apparatus.   On the outer peripheral surface of the main casing exposed to the outside when the sub casing is displaced in a direction away from the main casing, a slit for discharging the air in the main casing to the outside to dissipate heat is provided. It forms, The portable radiographic image detection apparatus of any one of Claims 1-8 characterized by the above-mentioned.   The portable radiographic image detection according to claim 9, further comprising: a signal processing unit that reads a signal representing the radiographic image from the detection unit, wherein the signal processing unit is disposed near the slit. apparatus.   The portable radiographic image detection apparatus according to claim 1, comprising a plurality of the sub-housings. In the portable radiographic image detection apparatus according to claim 11, which refers to claim 5,
Comprising at least first and second sub-housings;
Both the first and second sub-housings have a rotation center at one corner of the main housing. Position detecting means for detecting whether or not each of the plurality of sub-casings is in the storage position;
The control unit according to claim 11 or 12, further comprising: a control unit configured to control the battery in the sub-case not in the storage position to be used preferentially according to a detection result of the position detection unit. Portable radiological image detection device.   The portable radiographic image detection apparatus according to claim 1, wherein the detection unit is capable of capturing a moving image. A wireless transmission means for wirelessly transmitting the radiation image detected by the detection unit to the outside;
The portable radiographic image detection apparatus according to claim 1, wherein the sub-housing accommodates the wireless transmission unit in addition to the battery.

Images