JP2015051206A - Electronic cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic cassette capable of preventing attenuation of an electric wave attributed to a human body, and capable of sending electric waves to a plurality of directions while securing rigidity of a casing.SOLUTION: A casing 32 of an electronic cassette 16 is formed with anti-slipping parts 51 and opening parts 41 in positions corresponding to two corresponding long sides SY in a rear face 34 one set by one set. The opening parts 41 are formed one in each of side faces 36C, 36D corresponding to the two long sides SY. The two opening parts 41 are disposed in diagonal positions of the rear face 34. Therefore, the electronic cassette 16 can send electric waves to a plurality of directions while securing rigidity. In a direction in which the long side SY extends, a gap DY is formed between the anti-slipping part 51 and the opening part 41. Therefore, a hand laid on the anti-slipping part 51 does not close the opening part 41.

Description

  The present invention relates to an electronic cassette that detects a radiation image.

  In radiography, for example, X-ray imaging, electronic cassettes are becoming popular in place of film cassettes using X-ray films and IP cassettes using IP (imaging plates). The electronic cassette is a portable X-ray image detection device that detects an X-ray image representing image information of a subject based on X-rays transmitted through the subject. The electronic cassette is a flat rectangular parallelepiped portable case, and a sensor panel (also called FPD (Flat Panel Detector)) that is housed in the case and can output X-ray image data as digital data. Consists of.

  The electronic cassette can be used by attaching it to a stationary imaging table that captures a subject (patient) in a standing or lying position, or a part (eg, extremities) that is difficult to capture with a stationary imaging table. It is used by taking it on the bed or holding it by the patient. Also, to take pictures of patients who cannot come to the radiology room, take them to a hospital room that does not have an imaging stand, or take them out of the hospital to take pictures of elderly people who are being treated at home, accidents, disasters, etc. Sometimes used.

  An electronic cassette includes a wireless type that eliminates the need for a communication cable or a power cable by providing a wireless communication unit for wirelessly transmitting a detected X-ray image to the outside or a battery (see, for example, Patent Document 1). By making it wireless, it is not necessary to route the cable and the handling is improved. The wireless communication unit includes an antenna and a communication control circuit.

  In the electronic cassette described in Patent Document 1, an antenna is provided in a housing. The electronic cassette is designed to prevent external electromagnetic noise from other electronic devices from entering the housing and radiating electromagnetic noise generated by circuits inside the housing to the outside of the housing. have. For this reason, the electronic cassette of Patent Document 1 is provided with an opening for transmitting the antenna radio wave to the outside of the housing. A plurality of antennas are provided, and the opening is provided at the position of each antenna. The plurality of openings are provided on two orthogonal side surfaces of the housing and two orthogonal surfaces such as the side surface and the back surface, so that radio waves can be transmitted in a plurality of directions.

JP 2011-112923 A

  However, the electronic cassette may be used while being held by a patient. Since the human body attenuates radio waves, if the opening is blocked by a hand holding the housing, the radio wave is attenuated by the hand, so even if the number of openings is increased, the effect of sending radio waves in multiple directions There was a problem that could not be obtained sufficiently.

  In addition, a patient is often placed on the housing, and the housing is required to have rigidity capable of withstanding the patient's load. There is also a problem that the rigidity decreases as the number of openings provided in the housing increases.

  The present invention provides an electronic cassette capable of preventing radio waves from being attenuated by a human body blocking an opening, and capable of transmitting radio waves in a plurality of directions while ensuring the rigidity of the housing. Objective.

  In order to achieve the above object, an electronic cassette according to the present invention includes a sensor panel, a plurality of antennas, a housing, a plurality of openings, and a plurality of anti-slip portions. The sensor panel detects a radiographic image of the subject. The plurality of antennas transmit radiation images detected by the sensor panel. The housing houses a sensor panel and a plurality of antennas, and has a rectangular parallelepiped shape having a front surface on which radiation is incident, a rear surface facing the front surface, and four side surfaces. The plurality of openings are provided one on each of two or more of the four side surfaces, and transmit the radio waves of the antenna to the outside. The plurality of anti-slip portions are provided on the back surface and are disposed with a space between the opening portions and function as anti-slip of the hand hung on the back surface.

  The interval is preferably equal to or longer than a half wavelength of the radio wave.

  The plurality of openings have at least first and second openings, and the plurality of anti-slip parts have at least first and second anti-slip parts.

  Each of the first and second openings is preferably arranged on each of two side surfaces corresponding to two opposing first and second sides on the back surface.

  It is preferable that the first and second openings are arranged at positions that are separated by an equal distance in the opposite direction from the centers of the first side and the second side in the direction in which the first side and the second side extend.

  The first and second openings are preferably arranged at diagonal positions on the back surface.

  The first and second anti-slip portions are preferably provided one by one at positions corresponding to two sides of the first side to the fourth side of the back surface.

  The first set of the first anti-slip portion and the first opening is arranged at a position corresponding to the first side, and the second set of the second anti-slip portion and the second opening corresponds to the second side. It is preferable that it is arrange | positioned in the position to do.

  It is preferable that the first interval between the first anti-slip portion and the first opening and the second interval between the second anti-slip portion and the second opening are each not less than a half wavelength of the radio wave.

  It is preferable that the first and second anti-slip portions are arranged at the center of each of the first side and the second side.

  In the direction in which the first side and the second side extend, it is preferable that the centers of the first side and the second side coincide with the centers of the first and second anti-slip portions.

  The first anti-slip part corresponding to the first side and the second opening part corresponding to the second side face each other, the second anti-slip part corresponding to the second side, and the first opening part corresponding to the first side May be opposed to each other.

  In addition to the first and second anti-slip parts, it has third and fourth anti-slip parts, and the third and fourth anti-slip parts are respectively provided on two opposite third and fourth sides on the back surface. It is preferable that they are arranged.

  It is preferable that the openings are respectively arranged at positions corresponding to the third side and the fourth side.

  The first anti-slip portion and the first opening are respectively disposed at positions corresponding to the two first and second sides facing each other on the back surface, and correspond to the two third and fourth sides facing each other on the back surface. The second anti-slip part and the second opening part may be respectively arranged at the position.

  It is preferable that the first and second anti-slip portions are respectively disposed on the peripheral edge of the back surface. It is preferable that the first and second anti-slip portions have an elongated shape and the longitudinal direction extends along the side of the back surface.

  According to the present invention, an antenna opening is provided on each of two or more side surfaces of the housing, and a space is provided between the plurality of anti-slip portions provided on the back surface and the opening. It is possible to provide an electronic cassette that can prevent the radio wave from being attenuated by the human body when it is held and can transmit the radio wave in a plurality of directions while ensuring the rigidity of the housing.

It is the schematic which shows the structure of the X-ray imaging system using an electronic cassette. It is an external appearance perspective view of an electronic cassette. It is an external appearance perspective view of the housing | casing of an electronic cassette. It is sectional drawing of an electronic cassette. It is an external appearance perspective view from the back surface of an electronic cassette. It is sectional drawing of a non-slip | skid part. It is explanatory drawing of arrangement | positioning of a non-slip | skid part. It is explanatory drawing of how to hold an electronic cassette. It is explanatory drawing which shows the positional relationship of a non-slip | skid part and an opening part. It is explanatory drawing of the use condition of an electronic cassette. It is explanatory drawing of another use condition of an electronic cassette. It is explanatory drawing of a non-slip | skid part and opening part of 2nd Embodiment. It is explanatory drawing of a non-slip | skid part and opening part of 3rd Embodiment. It is explanatory drawing of the anti-slip | skid part and opening part of 4th Embodiment. It is explanatory drawing of the anti-slip | skid part and opening part of 5th Embodiment. It is explanatory drawing of the modification of a non-slip | skid part. It is explanatory drawing of another modification of a non-slip | skid part. It is an external appearance perspective view of the electronic cassette which provided the band in the back. It is sectional drawing of the electronic cassette which provided the band.

“First Embodiment”
In FIG. 1, an X-ray imaging system 10 includes an X-ray generation device 11 and an X-ray imaging device 12. The X-ray generator 11 includes an X-ray source 13, a radiation source controller 14 that controls the X-ray source 13, and an irradiation switch 15. The X-ray source 13 includes an X-ray tube that radiates X-rays and an irradiation field limiter (collimator) that limits an X-ray irradiation field emitted by the X-ray tube.

  The X-ray source control device 14 uses the X-ray source 13 based on irradiation conditions such as a tube voltage that determines an X-ray energy spectrum, a tube current that determines an irradiation amount per unit time, and an irradiation time during which X-ray irradiation continues. To control. The irradiation switch 15 is operated by a radiologist and generates an irradiation start signal for causing the X-ray source 13 to start irradiation. A signal generated by the irradiation switch 15 is input to the radiation source controller 14 through a signal cable.

  The X-ray imaging apparatus 12 includes an electronic cassette 16 and a console 17. The electronic cassette 16 is a portable X-ray image detection device. The electronic cassette 16 can be used for imaging the patient P on the bed 20 without using an imaging table. When photographing the chest of the patient P (subject), the patient P is inserted between the bed 20 and the patient P lying on the bed 20 and placed at a position corresponding to the chest. The irradiation direction of the X-ray source 13 is adjusted to a position facing the electronic cassette 16. The electronic cassette 16 detects an X-ray image of the patient P based on the X-rays irradiated from the X-ray source 13 and transmitted through the patient P.

  The console 17 receives an examination order in which patient information, an imaging region, an imaging purpose, and the like are designated from an external system such as an RIS (Radiation Information System). In addition, the console 17 gives an operation instruction to the electronic cassette 16 and displays an X-ray image detected by the electronic cassette 16.

  The electronic cassette 16 is a wireless type and includes an antenna 42 (see FIG. 4) that transmits and receives radio waves. The electronic cassette 16 can wirelessly communicate with the console 17 through the antenna 42. An operation instruction is transmitted from the console 17 to the electronic cassette 16, and the detected X-ray image is transmitted from the electronic cassette 16. The electronic cassette 16 is driven by a battery. Such a wireless type electronic cassette 16 is easy to handle because no communication cable or power cable is required.

  As shown in FIGS. 2 and 3, the electronic cassette 16 includes a sensor panel 31 and a portable housing 32 that houses the sensor panel 31. The housing 32 has a flat rectangular parallelepiped shape, and the front surface 33 serving as an X-ray incident surface, the back surface 34 opposite to the front surface 33, and the four side surfaces 36A, 36B, 36C, and 36D. And have. The planar shape which is the shape of the front surface 33 and the back surface 34 is rectangular. The side surfaces 36A and 36B are side surfaces in the short side direction and face each other. The side surfaces 36C and 36D are side surfaces in the long side direction and face each other. Note that the rectangular parallelepiped shape includes a substantially rectangular parallelepiped shape in which corners are rounded or tapered.

  The housing 32 is made of a conductive material having a shielding property against electromagnetic noise. As the conductive material, for example, stainless steel or carbon graphite is used. The front surface 33 is provided with a transmission plate 37 that transmits X-rays. The transmission plate 37 is made of, for example, carbon graphite. The casing 32 is provided with a resin outer frame 38 over the entire week of the side surfaces 36A to 36D. As illustrated in FIG. 4, the housing 32 is configured by combining, for example, a housing front surface portion 32 </ b> A on the front surface 33 side having the transmission plate 37 and a housing back surface portion 32 </ b> B on the back surface 34 side. For example, the housing front surface portion 32A and the housing back surface portion 32B may be made of different materials, for example, the housing front surface portion 32A is composed of a conductive resin frame and a transmission plate 37, and the housing back surface portion 32B is made of stainless steel. Good.

  The planar size of the housing 32 is, for example, a size conforming to the international standard ISO 4090: 2001 similar to a half-cut (383.5 mm × 459.5 mm) film cassette or IP cassette. Therefore, the electronic cassette 16 can also be used by being attached to a film cassette or an IP cassette photographing stand. In addition, the planar shape and size of the electronic cassette 16 of this example are examples. In addition, the plane size may be smaller than that of this example, or the plane shape may be a square.

  As shown in FIG. 4, one opening 41 is provided on each of two opposing side surfaces 36 </ b> C and 36 </ b> D. The opening 41 sends out radio waves emitted from an antenna 42 provided in the housing 32 and takes in radio waves from the outside into the housing 32. The antenna 42 receives the radio wave taken from the opening 41. Since the radio wave transmitted from the opening 41 has directivity, by providing the opening 41 on different side surfaces 36C and 36D, the transmission direction of the radio wave can be set to a plurality of directions. In addition, by providing a plurality of openings 41, radio waves from a plurality of directions from the outside can be received by the antenna 42. As shown in FIG. 3, the opening 41 is covered with an outer frame 38 attached to the housing 32. The outer frame 38 is made of resin, and the influence of attenuation of radio waves by the outer frame 38 is small.

  The sensor panel 31 includes a scintillator 46 and a photoelectric conversion unit 47, and is an indirect conversion type in which the scintillator 46 converts X-rays into visible light and converts visible light into electric signals. The photoelectric conversion unit 47 is a TFT active matrix substrate, and has an imaging region in which a plurality of pixels that accumulate charges corresponding to the incident dose of X-rays are two-dimensionally arranged. The pixel is composed of a photodiode and a TFT.

  The scintillator 46 is disposed so as to face the entire surface of the imaging region. The scintillator 46 is made of a phosphor such as CsI (cesium iodide) or GOS (gadolinium oxysulfide), and converts X-rays into visible light. The scintillator 46 is formed by a method of adhering a sheet coated with a phosphor on a support with an adhesive or depositing a phosphor on an imaging region.

  The sensor panel 31 employs an ISS (Irradiation. Side Sampling) system in which the photoelectric conversion unit 47 and the scintillator 46 are arranged in this order when viewed from the X-ray incident direction. The ISS method has high X-ray detection efficiency because the incident surface where the conversion efficiency from X-rays to visible light is maximum in the scintillator 46 and the imaging region of the photoelectric conversion unit 47 face each other. Note that the arrangement of the scintillator 46 and the photoelectric conversion unit 47 is not limited to the ISS method, and a PSS (Penetration Side Sampling) method in which the scintillator 46 and the photoelectric conversion unit 47 are arranged in this order when viewed from the X-ray incident direction. Good. The sensor panel 31 may be a direct conversion type that directly converts X-rays into electric charges instead of the indirect conversion type.

  A control circuit board 48 and a communication control circuit 49 are disposed below the sensor panel 31. The control circuit board 48 includes a gate driver that drives the photoelectric conversion unit 47, a read circuit that reads an image signal from the photoelectric conversion unit 47, an A / D converter that converts the read image signal into digital X-ray image data, X A memory for storing line images;

  The communication control circuit 49 constitutes a wireless communication unit together with the antenna 42. The communication control circuit 49 includes a modulation / demodulation circuit that modulates / demodulates radio waves transmitted / received by the antenna 42 and a transmission control circuit that performs transmission control in accordance with a wireless LAN standard such as IEEE802.11n. In the IEEE802.11n standard, it is possible to use radio waves in the 2.4 GHz band and the 5.2 GHz band. A battery (shown) that supplies power to each part of the sensor panel 31 is provided in the housing 32. For example, a rechargeable secondary battery is used as the battery.

  As shown in FIG. 5, anti-slip portions 51 and 52 are provided on the back surface 34 of the housing 32. The anti-slip portions 51 and 52 function as anti-slip of the hand hung on the back surface 34 when the housing 32 is held by hand. As shown in FIG. 6, the anti-slip portions 51 and 52 are provided by forming a recess 53 in the back surface 34. When the end portion of the housing 32 is gripped by hand so as to sandwich the front surface 33 and the back surface 34, the concave portion 53 is caught by the hand and resistance when the hand slides with respect to the back surface 34.

  As shown in FIG. 7, the two anti-slip portions 51 are disposed at positions corresponding to the two opposing long sides SY of the back surface 34. The long side SY is a side parallel to the side surfaces 36C and 36D. The two anti-slip portions 52 are disposed at positions corresponding to the two opposing short sides SX of the back surface 34. The short side SX is a side parallel to the side surfaces 36A and 36B. The non-slip portions 51 and 52 are arranged in a peripheral edge portion MA of the back surface 34 shown by hatching. Peripheral portion MA is a direction in which WX and long side SY extend (long side SY direction) in the direction in which short side SX extends (short side SX direction) with reference to short side SX and long side SY that are the edges of back surface 34. In FIG. 2, the region projects inward by the width of WY. The peripheral edge MA is an area where the hand is located on the back surface 34 when the end of the housing 32 is gripped by hand. The width WX and the width WY are determined in consideration of, for example, the average hand size, the average width of the region where the hand is located when the housing 32 is gripped. Specifically, the width WX and the width WY are preferably in the range of about 4 cm to 8 cm.

  The non-slip portions 51 and 52 have an elongated shape, and the longitudinal direction extends along the direction of each side SY and SX of the back surface 34. The anti-slip portions 51 and 52 are respectively arranged in the central portion in the long side SY direction or the short side SX direction. The center lines CX and CY pass through the center point O of the back surface 34 and extend in the short side SX direction and the long side SY direction, respectively. The center line CX intersects the center of the long side SY, and the center line CY is Crosses short side SX. The central part in the long side SY direction is a peripheral part including a position where the anti-slip part 51 overlaps the center line CX. The central portion in the short side SX direction is a peripheral portion including a position where the anti-slip portion 52 overlaps the center line CY.

  In this example, the anti-slip portions 51 and 52 are arranged so as to overlap with the center lines CX and CY, respectively. Further, in this example, the center of the anti-slip part 51 in the longitudinal direction (long side SY direction) coincides with the center line CX (center position in the long side SY direction), and the anti-slip part 52 has a longitudinal direction ( The center of the short side SX direction) coincides with the center line CY (center position of the long side SY direction). The reason why the non-slip portions 51 and 52 are arranged at the center in the long side SY direction and the short side SX direction is that, when the electronic cassette 16 is held, the hand is likely to be located there.

  For example, as shown in FIG. 8, when the radiologist T has the electronic cassette 16, if the center of each long side SY direction is grasped with both hands, the moment around the center O does not act on the electronic cassette 16. Therefore, the weight balance is the best. The same applies to the case where the electronic cassette 16 is rotated 90 degrees around the center O and the center portion in the direction of each short side SX is gripped. Since the electronic cassette 16 has a weight of, for example, about 3 kg to about 4 kg, an extra force is required unless it is in a portion with a good weight balance, and it is very difficult to hold. Therefore, the central part of each side SX, SY is a position where the hand is most likely to be located. Further, by arranging the anti-slip portions 51 and 52 at the center of each side SX and SY, the hand can be guided to a position that is easy to hold. This is because the non-slip portions 51 and 52 are easily recognized by visual or tactile sensation, and are not slippery compared to other portions, and thus are easy to hold.

  As shown in FIG. 9, one opening 41 is provided on each of the side surfaces 36C and 36D. Each opening 41 is disposed at a diagonal position on the back surface 34. The diagonal position is a position where the two openings 41 provided on the two opposing sides are respectively overlapped with the diagonal line DG of the back surface 34. The rigidity of the housing | casing 32 falls in the opening part 41 and its periphery. If the openings 41 are arranged at diagonal positions, the intervals between the openings 41 can be separated in the back surface 34, so that a reduction in local rigidity of the housing 32 can be suppressed.

  Further, at the diagonal position, in the long side SY direction, it is disposed at a position that is a distance L3 that is equal to the opposite direction from the center position of the side surfaces 36C and 36D (position that coincides with the center line CX). By separating each opening 41 from the center position in the opposite direction, one approaches the side surface 36A and the other approaches the side surface 36B in the opposite direction. And the part where the rigidity of the housing | casing 32 falls can be disperse | distributed comparatively uniformly by separating | separating equidistant L3 from the center position. For this reason, for example, the rigidity of the housing 32 can be prevented from becoming uneven in the back surface 34 as compared with the case where the two openings 41 are both close to the side surface 36A or the side surface 36B.

  Further, one set of anti-slip portions 51 and one opening portion 41 are provided at positions corresponding to the long side SY corresponding to the side surface 36D and the long side SY corresponding to the side surface 36C. The length L1 in the longitudinal direction of the non-slip portion 51 is longer than the width L2 of the opening 41. The length L1 of the non-slip portion 51 is determined in consideration of the length that the hand on the back surface 34 can be accommodated and the displacement of the position where the hand is placed (the displacement in the Y direction). On the other hand, the width L2 of the opening 41 is determined in consideration of the wavelength of radio waves and the like, but is preferably smaller from the viewpoint of rigidity. For these reasons, the length L1 of the anti-slip portion 51 is longer than the width L2 of the opening 41.

  In addition, each set of the anti-slip portion 51 and the opening portion 41 is arranged with an interval DY in the direction in which the long side SY extends (Y direction). As described above, since the anti-slip portion 51 is a part that is hand-held, if the gap is not provided between the opening portion 41 and the anti-slip portion 51, There is a possibility that all or a part of it will be blocked. Since the human body attenuates radio waves, when the opening 41 is blocked with a hand, the radio waves are attenuated by about 3 dB to 4 dB. Therefore, by providing a space DY between the anti-slip portion 51 and the opening 41, the hand is not caught on the opening 41, and the attenuation of radio waves is prevented.

  The radio wave transmitted from the opening 41 spreads concentrically around the center of the opening 41. Therefore, in order to more surely prevent the radio wave from being attenuated by the influence of the hand, it is preferable that the interval DY be equal to or greater than ½ wavelength (half wavelength) of the radio wave. If the interval DY is equal to or greater than ½ wavelength of the radio wave, the attenuation of the radio wave by the hand can be prevented as long as the hand is within the range of the length L1 of the anti-slip portion 51.

  When using a 5.2 GHz band radio wave, the wavelength λ is about 5.7 cm, and ½ of the wavelength λ is about 2.75 cm. Therefore, when using a 5.2 GHz band radio wave, the interval DY is about 2.75 cm or more. In addition, when a 2.4 GHz band radio wave is used, the wavelength λ is approximately twice that of the 5.2 GHz band, and thus is approximately 11.4 cm, and ½ of the wavelength λ is approximately 5.7 cm. Become. In this case, the interval DY is about 5.7 cm or more. In the IEEE802.11 standard, since two types of radio waves of 2.4 GHz band and 5.2 GHz band can be used, it is preferable that the interval DY is about 5.7 cm or more in consideration of the case where both are used. Note that the wavelength λ in this example is an example, and the interval DY is appropriately set according to the frequency of the radio wave used.

  In addition, the interval DY defined from the wavelength λ of the radio wave is as described above, but in order to ensure that the hand does not block the opening 41, a larger interval DY is better. Further, widening the interval DY also increases the distance L3 described above, and therefore, it is preferable that the interval DY is wide from the viewpoint of rigidity. If the openings 41 are arranged at diagonal positions as in this example, the distance L3 is maximized, which is preferable from the viewpoints of both radio wave attenuation and rigidity.

  The operation of the above configuration will be described with reference to FIGS. When imaging is performed using the electronic cassette 16, the radiologist T holds both ends of the electronic cassette 16 with hands and carries them to the position of the bed 20 of the patient P. As shown in FIG. 8, the anti-slip portions 51 and 52 are provided at the central portions of the sides SX and SY that are most balanced when the electronic cassette 16 is held. When the radiologist T has the electronic cassette 16, it is considered that he / she grabs the center part of each side SX, SY, which does not require extra force, and his hand hangs on the anti-slip parts 51, 52. Since the anti-slip portions 51 and 52 are provided, the hand hanging on the back surface 34 does not slip, and the electronic cassette 16 can be securely held.

  In FIG. 10, when positioning the electronic cassette 16 with respect to the patient P, the radiologist T holds the end of the electronic cassette 16 and inserts it between the patient P and the bed 20. Even when the radiographer T inserts the electronic cassette 16, his / her hand is put on the anti-slip portions 51 and 52 in order to grasp the central portion with a good weight balance. Therefore, the electronic cassette 16 can be securely held even when inserted.

  When the electronic cassette 16 is inserted between the patient P and the bed 20, the load of the patient P is applied to the housing 32. One opening 41 is provided on each of the side surfaces 36C and 36D. Therefore, the rigidity of the housing 32 is higher than when a plurality of openings 41 are provided on one side surface 36C, 36D. In addition, since the openings 41 are arranged at diagonal positions, the intervals between the openings 41 are separated as much as possible, and the casing 32 is compared with the case where the openings 41 are arranged close to each other. The rigidity is high. Therefore, the housing | casing 32 is robust and can endure a bigger load.

  When X-rays are irradiated from the X-ray source 13, the electronic cassette 16 detects an X-ray image. The detected X-ray image is wirelessly transmitted to the console 17 through the antenna 42. Since the opening 41 is provided on the two side surfaces 36C and 36D, radio waves can be transmitted in a plurality of directions. Since the electronic cassette 16 and the console 17 are portable, the relative positional relationship varies depending on the shooting location. By setting the radio wave transmission direction to a plurality of directions, stable communication can be performed even when the relative positional relationship between the electronic cassette 16 and the console 17 changes.

  In addition, as shown in FIG. 11, there is a case where the electronic cassette 16 is held by a patient P and photographing is performed. In this case, the middle part of the long side SY or the short side SX with good weight balance is grasped by hand. The back surface 34 is provided with a non-slip portion 51 along the long side SY direction and a non-slip portion 52 along the short side SX direction. Therefore, the hand of the patient P is put on the anti-slip part 51 or the anti-slip part 52. The electronic cassette 16 can be reliably held by the non-slip portions 51 and 52. In addition, since the space DY is provided between the anti-slip portion 51 and the opening 41, a hand on the anti-slip portion 51 does not block the opening 41.

  In this state, X-rays are irradiated and the electronic cassette 16 detects an X-ray image. The detected X-ray image is wirelessly transmitted to the console 17 through the antenna 42. Since the hand of the patient P is hanging on the non-slip portion 51, the opening 41 is not blocked by the hand. Therefore, the radio wave transmitted from the antenna 42 through the opening 41 is not attenuated by the influence of the hand, so that stable communication can be performed between the electronic cassette 16 and the console 17.

“Second Embodiment”
The electronic cassette 56 of the second embodiment shown in FIG. 12 is an example in which four openings 41 are provided by providing one opening 41 on each of the side faces 36A and 36B in addition to the side faces 36C and 36D. About another structure, it is the same as that of 1st Embodiment. Four antennas 42 are provided corresponding to the four openings 41. The number of antennas 42 and openings 41 is increased to four, and four openings 41 are provided on each of the four side surfaces 36A to 36D, so that the transmission direction of radio waves is multidirectional compared to the first embodiment. Can be.

  On the other hand, as the number of openings 41 is increased, the rigidity of the housing 32 is reduced as compared with the first embodiment. However, since each opening 41 is provided one by one on each of the side surfaces 36A to 36D, the rigidity of the housing 32 is higher than when a plurality of openings 41 are provided on one side surface. In addition, since the openings 41 are arranged at diagonal positions in both the direction of the long side SY and the direction of the short side SX, it is possible to suppress a decrease in rigidity as in the first embodiment.

  Each short side SX is provided with a set of an anti-slip portion 52 and an opening 41, respectively. The distance DX between the non-slip portion 52 and the opening 41 has a length of ½ or more of the radio wave, similarly to the distance DY. The purpose is to prevent the attenuation of radio waves caused by the opening 41 being blocked by the hand, like the interval DY.

“Third Embodiment”
The electronic cassette 58 of the third embodiment shown in FIG. 13 is provided with one opening 41 at each of the positions (side surfaces 36A, 36B) corresponding to the two short sides SX facing each other on the back surface 34. In this example, anti-slip portions 51 are provided at positions corresponding to the long side SY.

  Also in the electronic cassette 58, the anti-slip part 51 and the opening part 41 are separated from each other by a distance DY or more. Moreover, the anti-slip portion 51 is provided at a position corresponding to the long side SY, and the opening 41 is provided at a position corresponding to the short side SX, and the anti-slip portion 51 and the opening portion 41 are provided at two orthogonal sides, respectively. Is provided. Further, only one of the anti-slip portion 51 and the opening 41 is provided at a position corresponding to one side. Therefore, compared with 1st Embodiment and 2nd Embodiment, it can prevent more reliably that the hand applied to the anti-slip | skid part 51 blocks the opening part 41. FIG. The point that the two openings 41 are arranged at diagonal positions and the point that the anti-slip part 51 is provided at the center of the long side SY are the same as in the first and second embodiments.

“Fourth Embodiment”
In the electronic cassette 60 of the fourth embodiment shown in FIG. 14, two openings 41 and two anti-slip portions 51 are provided as in the third embodiment. The difference is the position of the opening 41 and the anti-slip part 51.

  One set of the opening 41 and the anti-slip part 51 is arranged at a position corresponding to two opposing long sides SY. The two anti-slip portions 51 overlap the center position (center line CX) of the long side SY, and are arranged at the center of the long side SY. However, unlike the third embodiment, each anti-slip portion 51 is extended in the opposite direction to the opening 41 in the long side SY direction (longitudinal direction). For this reason, the center of each anti-slip portion 51 does not coincide with the center position (center line CX) of the long side SY.

  Further, the two openings 41 provided on the side surfaces 36C and 36D are not located diagonally as in the first and second embodiments, but are arranged close to the center in the long side SY direction. . Each opening 41 is arranged to face a part of the non-slip portion 51. In this case, as compared with the case where the two openings 41 are arranged at diagonal positions (the electronic cassette 16 of the first embodiment (FIG. 9)), two of the side surfaces 36C and 36D indicated by the straight line A are shown. The interval between the two openings 41 is shortened. However, each opening 41 of the side surfaces 36C and 35D is disposed at a position separated by a distance L4 equal to the opposite direction from the center position (center line CX) in the long side SY direction. Therefore, although it is inferior to the diagonal arrangement, the rigidity of the casing 32 can be ensured. Further, in the electronic cassette 60, since the distance DY between the anti-slip part 51 and the opening part 41 is provided, the opening part 41 is not blocked by a hand hung on the anti-slip part 51.

“Fifth Embodiment”
As in the electronic cassette 62 of the fifth embodiment shown in FIG. 15, the two anti-slip portions or the two openings may not be provided on the two opposing sides. In the electronic cassette 62, at the positions corresponding to the two long sides SY, the anti-slip portion 51 and the opening 41 are disposed at the center in the direction of the long side SY, and the anti-slip portion 51 and the opening 41 face each other. ing. Further, even at positions corresponding to the two short sides SX, the anti-slip portion 52 and the opening 41 are disposed at the center in the direction of the short side SX, and the anti-slip portion 52 and the opening 41 are opposed to each other. . Also in this example, the effect of making the transmission direction of the radio wave a plurality of directions, the effect of ensuring the rigidity by providing only one opening on one side surface, the spacing between the anti-slip part and the opening, It is possible to obtain the effect of preventing the attenuation of.

“Sixth Embodiment”
In each said embodiment, although the form of the anti-slip | skid parts 51 and 52 was made into the form which forms the recessed part 53 in the back surface 34, the form of the anti-slip | skid parts 51 and 52 is not restricted to the said example. For example, like the anti-slip | skid part 71 shown in FIG. 16, in addition to the recessed part 53, you may provide the some convex part 72 in the bottom face of the recessed part 53. FIG. Further, as in a non-slip portion 73 shown in FIG. 17, an elastic member 74 such as rubber having a higher friction coefficient than the back surface 34 may be fitted in the recess 53. Further, the convex portion 72 may be formed on the surface of the elastic member 74. In short, the anti-slip portion may have any form as long as the coefficient of friction is higher than that of the back surface 34.

  However, when the electronic cassette is used by being attached to the imaging table, the thickness of the electronic cassette is regulated within the width of the slot of the imaging table into which the electronic cassette is inserted. Therefore, when the electronic cassette is used on the photographing stand, it is preferable that the non-slip portions 71 and 72 have a small protrusion amount from the back surface 34, and more preferably, the non-slip portions 71 and 72 do not protrude from the back surface 34 and the height of the back surface 34. It is better to be within. In the case of using the photographing stand, the electronic cassette may be accommodated in the mounting holder and attached to the photographing stand. In that case, if it is in the range which can be accommodated in the holder for mounting | wearing, the protrusion from the back surface 34 of the anti-slip | skid parts 71 and 72 is accept | permitted. More specifically, the entire thickness of the electronic cassette including the amount of protrusion of the anti-slip portion only needs to conform to the JIS Z 4905 standard that defines the size of the X-ray imaging cassette.

  In each of the above embodiments, the example in which the entire anti-slip portion is accommodated in the peripheral edge MA (FIG. 7) of the back surface 34 has been described. However, a part of the anti-slip portion may protrude from the peripheral edge MA. For example, if the area of the anti-slip portion is increased, the area of the hand can be increased, so that the anti-slip function is improved. However, the electronic cassette may be used by being inserted between the patient P and the bed 20 as shown in FIG. Considering the insertability of the electronic cassette, it is better that the coefficient of friction on the back of the electronic cassette is low. Therefore, it is not preferable to increase the area of the anti-slip portion more than necessary. For this reason, it is preferable that the entire anti-slip portion is accommodated in the peripheral edge portion MA.

  An electronic cassette 81 shown in FIGS. 18 and 19 is provided with a holding band 82 on the back surface 34. The band 82 extends in the longitudinal direction along one side of the back surface 34. Both ends of the band 82 are fixed to the back surface 34 by a fixture 83. Such a band 82 can also function as a non-slip portion. However, as the band 82 is provided, the thickness of the electronic cassette 81 increases, which is disadvantageous when used by being inserted into the slot of the photographing stand as described above. Other configurations of the electronic cassette 81, for example, a configuration in which one opening is provided on each of two or more of the four side surfaces, and a configuration in which the opening and the band 82 are spaced apart Is the same as in the above embodiments.

  Some electronic cassettes are provided with a housing holding handle having an opening into which fingers can be inserted. The present invention can be applied to those having such a handle. However, the present invention is particularly effective when the handle with an opening is not provided in the housing as in the electronic cassette shown in the above embodiments. The reason is that when there is no handle, the end of the rectangular parallelepiped housing must be gripped, and therefore, the necessity of the anti-slip portion is particularly high when there is no handle with an opening.

  The present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention. For example, the above-described various embodiments and various modifications can be appropriately combined. The present invention can be applied not only to X-rays but also to electronic cassettes that use other radiation such as γ rays.

16, 56, 58, 60, 62, 81 Electronic cassette 31 Sensor panel 32 Housing 33 Front surface 34 Back surface 36A, 36B, 36C, 36D Side surface 41 Opening portion 42 Antenna 51, 52 Non-slip portion

Claims (17)

A sensor panel for detecting a radiographic image of the subject;
A plurality of antennas for transmitting radiation images detected by the sensor panel;
A rectangular parallelepiped housing that houses the sensor panel and the plurality of antennas and has a front surface on which radiation is incident, a rear surface facing the front surface, and four side surfaces;
A plurality of openings provided to send out the radio waves of the antenna to the outside, one each on two or more of the four side surfaces;
A plurality of anti-slip portions provided on the back surface and disposed with a gap between the openings and functioning as anti-slip of the hands hung on the back surface. Electronic cassette.   The electronic cassette according to claim 1, wherein the interval is equal to or longer than a half wavelength of the radio wave. The plurality of openings have at least first and second openings,
The electronic cassette according to claim 2, wherein the plurality of anti-slip portions include at least first and second anti-slip portions.   The said 1st and 2nd opening part is respectively arrange | positioned 1 each on the said 2 said side surfaces corresponding to two 1st edge | sides and 2nd edge | sides which the said back surface opposes to each other. The electronic cassette described.   The first and second openings are arranged at positions that are separated by an equal distance in the opposite direction from the centers of the first and second sides in the direction in which the first and second sides extend. The electronic cassette according to claim 4.   The electronic cassette according to claim 5, wherein the first and second openings are arranged at diagonal positions on the back surface.   The said 1st and 2nd anti-slip | skid part is provided in the position corresponding to two sides among the 1st side of the said back | inner side to the 4th side, respectively. The electronic cassette according to any one of the above.   The first set of the first anti-slip portion and the first opening is disposed at a position corresponding to the first side, and the second set of the second anti-slip portion and the second opening is The electronic cassette according to claim 7, wherein the electronic cassette is disposed at a position corresponding to the second side.   The first interval between the first anti-slip portion and the first opening and the second interval between the second anti-slip portion and the second opening are each greater than or equal to a half wavelength of the radio wave. The electronic cassette according to claim 8.   10. The electronic cassette according to claim 8, wherein the first and second anti-slip portions are arranged at the center of each of the first side and the second side. 11.   The center of the first side and the second side coincides with the center of the first and second anti-slip portions in a direction in which the first side and the second side extend. 10. An electronic cassette according to 10.   The first anti-slip part corresponding to the first side and the second opening part corresponding to the second side face each other, the second anti-slip part corresponding to the second side, and the first side The electronic cassette according to any one of claims 8 to 11, wherein the first openings corresponding to the above are opposed to each other.   In addition to the first and second anti-slip parts, the first and second anti-slip parts have third and fourth anti-slip parts, and the third and fourth anti-slip parts have two opposite third and fourth sides on the back side. The electronic cassette according to any one of claims 8 to 12, wherein the electronic cassette is disposed in each case.   The electronic cassette according to claim 13, wherein the opening is disposed at a position corresponding to the third side and the fourth side.   The first anti-slip portion and the first opening are disposed at positions corresponding to the two first and second sides facing each other on the back surface, and the two third sides and the fourth facing each other on the back surface. 4. The electronic cassette according to claim 3, wherein the second anti-slip portion and the second opening are arranged at positions corresponding to the sides. 5.   The electronic cassette according to any one of claims 3 to 15, wherein each of the first and second anti-slip portions is disposed on a peripheral portion of the back surface.   The electronic cassette according to claim 16, wherein the first and second anti-slip portions have an elongated shape, and a longitudinal direction extends along a side of the back surface.

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