JP2009195462A - Movable radiation equipment and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire radiation image information without deformation by preventing application of vibration to an accumulative fluorescent panel when the image is read. <P>SOLUTION: A reading device 26 includes first and second position detection sensors 67a and 67b capable of detecting the position of the accumulative fluorescent panel P conveyed by first and second nip rollers 52d and 52e. If the accumulative fluorescent panel P is held at only one end in the direction of conveyance by the first and second position detection sensors 67a and 67b, rotation of an arm member 30a and a support part 30b for rotating an X-ray source 16 toward a subject 18 side is restrained by an electromagnetic lock 31, and a rear wheel 96 of a cart 12 is braked by an electromagnetic brake 100 to stop the cart 12, so that generation of vibration can be prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mobile radiation apparatus in which an image reading unit that reads an image from a radiation conversion panel in which radiation image information is recorded is mounted on a carriage, and a control method thereof.

  For example, when a certain type of phosphor is irradiated with radiation (X-ray, α-ray, β-ray, γ-ray, ultraviolet ray, electron beam, etc.), a part of the energy of this radiation is accumulated in the phosphor, and then the fluorescence When the body is irradiated with excitation light such as visible light, stimulated emission light corresponding to the accumulated energy is output.

  Using a stimulable phosphor panel made of such a phosphor, radiographic image information of a subject such as a human body is accumulated and recorded on the stimulable phosphor panel using an imaging device, and then a radiographic image information is obtained using a reader. Is a radiation that scans the stimulable phosphor panel with the recorded light with excitation light, photoelectrically reads the resulting stimulated emission light, converts it into an image signal, and processes the image signal to obtain an image with excellent diagnostic suitability An image information processing system has been developed.

  By the way, in recent years, there has been an increasing demand for imaging of patients who are difficult to move from a hospital room and emergency imaging in an operating room, etc., and on-site rooms such as hospital rooms and operating rooms other than X-ray (X-ray) imaging rooms There is an increasing need for doctors to quickly and accurately check images taken in the (shooting site room).

  In order to meet such needs, a mobile X-ray imaging apparatus has been proposed. For example, a mobile X-ray imaging apparatus disclosed in Patent Document 1 has an imaging apparatus mounted on a movable carriage so that a hospital room or the like can be visited (for example, see Patent Document 1).

JP 2005-323673 A

  However, in such a mobile X-ray imaging apparatus, for example, when the radiation image information of the stimulable phosphor panel is being read while the carriage is moving, the carriage collides with an obstacle or the like, Vibration may be applied. In this case, the stimulable phosphor panel swings, and there is a problem that a part of the image cannot be read due to the influence (occurrence of image distortion) and the image reading accuracy is deteriorated.

  The present invention has been made in consideration of the above-mentioned problems, and prevents the application of vibration to the stimulable phosphor panel during image reading and can obtain radiation image information without distortion. And it aims at providing the control method.

In order to achieve the above object, the present invention comprises a radiation source that irradiates a subject with radiation, a radiation conversion panel that records radiation image information obtained by converting radiation transmitted through the subject, and the radiation conversion panel. A mobile radiation apparatus that mounts on a carriage a transport mechanism that transports and an image reading unit that reads the radiation image information recorded on the radiation conversion panel,
The transport mechanism has at least two pairs of nip rollers that freely hold the radiation conversion panel;
Detecting means for detecting a holding state of the radiation conversion panel by the two pairs of nip rollers;
Operation restriction means for restricting the operation of a vibration source that vibrates the radiation conversion panel based on the holding state of the radiation conversion panel detected by the detection means;
It is characterized by providing.

  The detection means may be provided in the vicinity of one nip roller and the other nip roller, and may be a position detection sensor that can detect the conveyance position of the radiation conversion panel.

  Further, the movement restricting means is based on a control signal from the control unit when the position detection sensor detects that only one of both ends in the transport direction of the radiation conversion panel is held by the two pairs of nip rollers. Thus, a lock mechanism for electrically regulating the operation of the vibration generating source may be used.

  Furthermore, the vibration generating source may be a moving arm that is provided on the carriage and is movable to a position where the wheel and the radiation source that travels the carriage under the driving action of the motor are exposed to the subject.

Furthermore, the detection means is provided in the vicinity of one nip roller and the other nip roller, respectively, and a position detection sensor capable of detecting the transport position of the radiation conversion panel;
A vibration detection sensor capable of detecting vibration applied to the image reading unit;
Consists of
When the detection value detected by the vibration detection sensor exceeds a predetermined value, reading by the image reading unit may be stopped.

Further, the present invention provides a radiation source that irradiates a subject with radiation, a transport mechanism that transports a radiation conversion panel on which radiation image information is recorded, having at least two pairs of nip rollers, and recorded on the radiation conversion panel. A method for controlling a mobile radiation apparatus that mounts an image reading unit for reading radiation image information on a carriage,
Detecting a holding state of the radiation conversion panel by the two pairs of nip rollers with a position detection sensor;
Determining a holding state at both ends in the transport direction of the radiation conversion panel by the nip roller based on a detection result by the position detection sensor;
A step of limiting the drive of the vibration generating source by the movement limiting means when it is determined that only one of both ends in the transport direction is held in the radiation conversion panel;
It is characterized by having.

In addition, the position detection sensor detects the conveyance position of the radiation conversion panel, and at the same time the vibration detection sensor detects vibrations
A step of comparing the detected value with a preset value when the vibration is detected;
A step of stopping reading of the image reading unit when it is determined that the detection value is larger than the set value;
It is good to have.

  According to the present invention, the following effects can be obtained.

  That is, the transport mechanism for transporting the radiation conversion panel is provided with two pairs of nip rollers, the holding state of the radiation conversion panel by the two pairs of nip rollers is detected by the detection means, and the transport direction in the radiation conversion panel is detected by the detection means. When only one of both ends is held, the operation of the vibration source can be limited by the operation limiting means. Therefore, it is possible to prevent the radiation conversion panel from being swung by vibration when reading radiation image information, and to obtain radiation image information without distortion.

  FIG. 1 shows a configuration of a radiation image forming system 10 to which a mobile radiation apparatus and a control method thereof according to a first embodiment of the present invention are applied.

  The radiation image forming system 10 is configured to be transportable to a hospital room or the like while being placed on the carriage 12.

  The carriage 12 is equipped with a console 14 having a display for inputting imaging information for imaging radiographic image information or the like, or acquiring it from the outside. An X-ray source control device 22 that controls an X-ray source (radiation source) 16 in accordance with radiographic information supplied from the console 14 and irradiates the subject 18 with X-rays 20 in the system main body 15 provided in the carriage 12. Then, a cassette 24 containing a stimulable phosphor panel (radiation conversion panel) P on which radiation image information is recorded by being irradiated with X-rays 20 transmitted through the subject 18 is loaded, and the stimulable phosphor panel P is loaded. Reading device 26 for reading radiation image information from the vehicle, traveling control device 27 for controlling traveling of the carriage 12, and radiation image information read from the stimulable phosphor panel P to the outside, while necessary information from the outside And a battery 29 for supplying power to the console 14, the X-ray source 16, the X-ray source control device 22, the reading device 26 and the transceiver 28. There is placed.

  The X-ray source 16 is connected to a support column 30b constituting the X-ray source control device 22 via an arm member 30a, and the support column 30b is rotatably supported with respect to the X-ray source control device 22. . That is, the X-ray source 16 is provided so as to be movable with respect to the X-ray source control device 22 with the support column 30b as a fulcrum. An electromagnetic lock (operation restricting means) 31 that can be fixed by restricting the rotational displacement of the support column 30b is provided at a connection portion between the support column 30b and the X-ray source control device 22.

  In addition, a charger 32 is connected to the battery 29, and the battery 29 can be charged as necessary. Note that the X-ray source 16, the X-ray source control device 22, and an X-ray irradiation switch 76 described later constitute an imaging apparatus.

  FIG. 2 shows the internal configuration of the reading device 26. Here, the cassette 24 loaded in the reading device 26 has a lid member 34 that can be freely opened and closed, and a barcode (not shown) in which ID information for identifying the cassette 24 is recorded.

  The reading device 26 includes a cassette loading unit 38 on the upper portion of the casing 36, and the cassette loading unit 38 is provided with a lid member 40 that is slidable in the arrow direction. The cassette 24 storing the stimulable phosphor panel P on which the radiation image information is recorded is loaded into the cassette loading unit 38 with the lid member 34 facing down. The casing 36 is made of a material containing heavy metal such as lead in order to prevent the X-ray 20 from entering from the outside.

  The cassette loading unit 38 includes a barcode reader 42 that reads a barcode attached to the cassette 24, an unlocking mechanism 46 that unlocks the lid member 34 of the cassette 24, and the stimulable phosphor panel P from the cassette 24. An adsorbing plate 48 that adsorbs and takes out and a nip roller 50 that sandwiches and conveys the stimulable phosphor panel P taken out by the adsorbing plate 48 are disposed.

  A plurality of transport rollers 52 a to 52 g and a plurality of guide plates 54 a to 54 f are arranged in series with the nip roller 50, and a curved transport path (transport means) 56 is configured by these. The curved conveyance path 56 between the conveyance rollers 52c and 52d constitutes a width-shifting portion that brings the stimulable phosphor panel P in a direction perpendicular to the conveyance direction. The curved conveyance path 56 extends downward from the cassette loading unit 38, then becomes substantially horizontal at the lowermost portion, and then extends substantially vertically upward. The part extending substantially vertically upward constitutes the rear conveyance path. By configuring the curved conveyance path 56 to be curved in this way, the reading device 26 can be reduced in size.

  In addition, each position of the curved conveyance path 56 functions as a retracting unit that retracts the stimulable phosphor panel P during imaging using the X-ray source 16. In addition, sensors 55a to 55d that detect the stimulable phosphor panel P to be transported are disposed at predetermined portions of the curved transport path 56.

  Between the nip roller 50 and the conveyance roller 52a, an erasing unit (erasing unit) 60 for erasing radiation image information remaining on the stimulable phosphor panel P after the reading process is disposed. The erasing unit 60 has a plurality of erasing light sources 62 composed of cold cathode tubes that output erasing light.

  On the other hand, a platen roller 64 is disposed between the transport rollers 52d and 52e disposed at the lowermost portion of the curved transport path 56, as shown in FIG. A scanning unit (image reading unit) 66 that reads radiation image information accumulated and recorded on the stimulable phosphor panel P is disposed on the platen roller 64. In the following description, the conveyance rollers 52d and 52e disposed in the scanning unit are referred to as a first nip roller 52d and a second nip roller 52e.

  In the vicinity of the first nip roller 52d, there is provided a first position detection sensor 67a that can be detected when the stimulable phosphor panel P faces, and similarly, in the vicinity of the second nip roller 52e, the stimulable phosphor A second position detection sensor 67b that can be detected when the panel P faces is provided.

  The first and second position detection sensors 67a and 67b are, for example, optical sensors capable of irradiating sensor light toward the stimulable phosphor panel P, and are accumulative with respect to the first and second nip rollers 52d and 52e. It arrange | positions so that it may become the conveyance direction side (arrow A direction) of the fluorescent substance panel P. FIG. Then, the sensor light emitted from the first and second position detection sensors 67a and 67b is reflected by the stimulable phosphor panel P and received by the first and second position detection sensors 67a and 67b. It is detected that the stimulable phosphor panel P is transported and positioned at positions facing the first and second position detection sensors 67a and 67b. When the front end P1 and the rear end P2 of the stimulable phosphor panel P are detected by the first and second position detection sensors 67a and 67b, a detection signal is output to the reading device control unit 80 constituting the reading device 26. And output to the traveling control device 27.

  The scanning unit 66 derives a laser beam LB that is excitation light and scans the stimulable phosphor panel P in a direction orthogonal to the transport direction, and radiation emitted by being excited by the laser beam LB. A condensing guide 70 for condensing the photostimulated luminescent light related to the image information, and a photomultiplier 72 for converting the photostimulated luminescent light collected by the condensing guide 70 into an electrical signal are provided. A condensing mirror 74 for increasing the condensing efficiency of the photostimulated luminescent light is disposed adjacent to one end of the condensing guide 70.

  FIG. 3 shows a control block of the radiation image forming system 10. Connected to the X-ray source control device 22 is an X-ray irradiation switch 76 that drives the X-ray source 16 by the operator's operation and irradiates the subject 18 with the X-ray 20.

  The reading device 26 includes a reading device control unit 80. The reading device control unit 80 controls the power switch 82 of the reading device 26, the cassette discharge button 88 for discharging the cassette 24 from the reading device 26, the barcode reader 42 for reading the barcode of the cassette 24, and the scanning unit 66. A scanning unit control unit 84, an erasing unit control unit 86 for controlling the erasing unit 60, and a panel conveyance control unit 90 for conveying the stimulable phosphor panel P by controlling the curved conveyance path 56 are connected. The reader control unit 80 moves the stimulable phosphor panel P to a predetermined retreat unit, and then outputs an imaging permission signal for permitting imaging by the X-ray source 16 to the X-ray source control device 22.

  For example, when a shot signal is input from the X-ray irradiation switch 76 by an operator after the imaging permission signal is input, the X-ray source control device 22 drives the X-ray source 16 to perform imaging of radiation image information. . X-rays 20 output from the X-ray source 16 pass through the subject 18 and are irradiated onto the stimulable phosphor panel P accommodated in the cassette 24 to accumulate and record radiation image information. When the imaging is completed, the X-ray source control device 22 outputs an imaging end signal to the reading device control unit 80.

  After the imaging end signal is input from the X-ray source control device 22, the reader control unit 80 operates the cassette discharge button 88 to instruct the cassette 24 to be discharged. The curved conveyance path 56 is controlled by the above, and the stimulable phosphor panel P waiting in the casing 36 is conveyed and accommodated in the cassette 24, and then the lid member 34 is closed to close the cassette 24 with respect to the cassette loading portion 38. Release the locked state. Therefore, the operator can pull out the cassette 24 storing the stimulable phosphor panel P from the cassette loading unit 38.

  The carriage 12 includes a front wheel 94 and a rear wheel (wheel) 96, and a drive motor 98 that is rotated by power supplied from the battery 29 is connected to the rear wheel 96. The drive motor 98 is connected to an encoder (not shown) for detecting the rotational speed of the drive motor 98 and obtaining the speed of the carriage 12. Further, the carriage 12 is provided with an electromagnetic brake (operation restricting means) 100 capable of braking the rear wheel 96 at a portion facing the rear wheel 96.

  On the other hand, a grip 102 is rotatably provided in the system main body 15, and a traveling switch (not shown) is configured by the grip 102. In addition, as a travel switch, various structures, such as a lever type and a button type, are employable.

  When the travel control device 27 receives a travel command from a travel switch (not shown), controls the drive motor 98 based on the travel command, and receives a signal for limiting the travel acceleration of the carriage 12, for example, The applied current to the drive motor 98 is decreased, and the electromagnetic brake 100 is operated to suppress the rotation of the rear wheel 96 and stop the carriage 12.

  This travel switch sends a speed increase signal to the travel control device 27 via the grip 102 when accelerating the carriage 12, while rotating the grip 102 in the opposite direction when decelerating the travel control device 27. Send a speed reduction signal to. When the operator's hand is released from the grip 102, the drive motor 98 is suddenly braked and the electromagnetic brake 100 provided on the rear wheel 96 is activated to restrict the movement of the carriage 12.

  The radiation image forming system 10 to which the mobile radiation apparatus and the control method thereof according to the first embodiment of the present invention are applied is basically configured as described above. A case will be described in which the cassette 24 containing the stimulable phosphor panel P in which information is accumulated and recorded is loaded in the reader 26 and the reading process is performed.

  When the cassette 24 is loaded into the cassette loading unit 38 of the reading device 26, the barcode reader 42 reads the barcode attached to the cassette 24 to acquire the ID information of the cassette 24, and then the lid is released by the lock release mechanism 46. The member 34 is unlocked and opened.

  Next, the stimulable phosphor panel P in the cassette 24 is sucked and taken out by the suction board 48 and supplied to the curved conveyance path 56 by the nip roller 50. The conveyance rollers 52a to 52c, the first nip roller 52d, the second nip roller 52e, the conveyance roller 52f, and the conveyance roller 52g constituting the curved conveyance path 56 convey the stimulable phosphor panel P.

  At this time, as shown in FIG. 5, the front end P1 of the stimulable phosphor panel P is sandwiched by the pair of first nip rollers 52d and is sub-scanned and conveyed, so that the second end facing the stimulable phosphor panel P is obtained. Detected by the one-position detection sensor 67a, the stimulable phosphor panel P is further transported in the sub-scanning state, and the front end P1 is sandwiched between the pair of second nip rollers 52e so as to face the stimulable phosphor panel P. While being detected by the two-position detection sensor 67b, the stimulable phosphor panel P is also detected by the first position detection sensor 67a. That is, the first and second position detection sensors 67a and 67b detect whether or not the stimulable phosphor panel P is being sub-scanned and conveyed at positions facing the first and second position detection sensors 67a and 67b. The position detection signal of the stimulable phosphor panel P detected by the first and second position detection sensors 67 a and 67 b is output to the reading control unit and the travel control device 27.

  Thus, as shown in FIG. 5A, only the front end P1 of the stimulable phosphor panel P is sandwiched between the first nip rollers 52d, or as shown in FIG. When the first and second position detection sensors 67a and 67b detect that only the rear end P2 of the body panel P is sandwiched between the second nip rollers 52e, the first and second positions are detected. Based on detection signals output from the detection sensors 67a and 67b, a control signal is output from the reader control unit 80 to the electromagnetic lock 31, and the electromagnetic lock 31 is switched to the locked state to include the support column 30b. In addition to restricting the rotational displacement of 16, a control signal is output from the travel control device 27 to the electromagnetic brake 100 to stop the rotation of the rear wheel 96.

  Thereby, at the time of reading of the stimulable phosphor panel P, vibration generated when the X-ray source 16 is rotated with the support column 30b as a fulcrum and vibration generated when the carriage 12 travels are applied to the reading device 26. Is prevented. As a result, the accumulative phosphor panel P being sub-scanned and conveyed during reading does not swing, and high-precision image reading can be performed.

  5B, when the rear end P2 of the stimulable phosphor panel P is sandwiched between the second nip rollers 52e and the front end P1 is sandwiched between the first nip rollers 52d, The stimulable phosphor panel P is detected by the first and second position detection sensors 67a and 67b, and it is confirmed that the front end P1 and the rear end P2 of the stimulable phosphor panel P are held. As a result, it is determined that the stimulable phosphor panel P does not swing due to vibration or the like, and reading is continued.

  In other words, no control signal is output from the reader control unit 80 to the electromagnetic lock 31, and similarly, no control signal is output from the travel control device 27 to the electromagnetic brake 100.

  As described above, the stimulable phosphor panel P is sub-scanned and conveyed between the first nip roller 52d and the second nip roller 52e, and the laser beam LB from the excitation unit 68 performs the main scan on the stimulable phosphor panel P. Radiographic image information is read. That is, when the stimulable phosphor panel P is irradiated with the laser beam LB output from the excitation unit 68, the stimulable phosphor light corresponding to the radiation image information is output from the stimulable phosphor panel P. This stimulated emission light is guided to the photomultiplier 72 through the light collecting guide 70 and converted into radiation image information as an electrical signal. The read radiation image information is stored in a storage means (not shown) together with the ID information of the cassette 24 or is transmitted from the transceiver 28 to the outside via the console 14.

  The stimulable phosphor panel P from which the radiation image information 92 has been read is once transported to the guide plate 54 f side, and then returned to the cassette loading unit 38 side again via the lower part of the scanning unit 66. The stimulable phosphor panel P returned to the cassette loading unit 38 side is stored with the stimulable fluorescence by the erase light output from the erase light source 62 constituting the erase unit 60 disposed between the nip roller 50 and the transport roller 52a. The radiation image information remaining on the body panel P is removed.

  The storable phosphor panel P for which the remaining radiation image information has been erased is housed in the cassette 24 using the nip roller 50 and the suction disk 48 and the lid member 34 is closed, and then the cassette ejection button 88 is operated. As a result, it is extracted from the cassette loading section 38 and used for the next photographing.

  Further, it is desirable not to perform the reading process or the erasing process of the radiation image information while the radiation image information is captured. This is because, due to the influence of the X-rays 20, noise may be mixed into the read radiation image information or erasure unevenness may occur.

  Next, a radiation image forming system 150 according to a second embodiment is shown in FIGS. The same components as those in the radiation image forming system 10 according to the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  The radiation image forming system 150 according to the second embodiment includes a vibration sensor 154 that can detect an impact applied to the reading device 152, and a vibration value detected by the vibration sensor 154 is set in advance. The difference from the radiographic image forming system 10 according to the first exemplary embodiment is that the reading of the radiographic image by the reading device 152 is stopped when the value is equal to or greater than the value.

  As shown in FIG. 6, the reading device 152 is provided with a vibration sensor 154 capable of detecting impact, vibration, and the like applied to the reading device 152 inside the casing 36. The vibration sensor 154 includes, for example, an acceleration sensor that can detect acceleration in a predetermined direction, and detects acceleration in at least two axial directions (for example, X and Y directions) caused by impact, vibration, and the like. Then, a detection signal detected by the vibration sensor 154 is output to the reading device controller 80.

  The first and second nip rollers 52d and 52e are respectively provided with encoders 156a and 156b capable of detecting the rotation speed R of the first and second nip rollers 52d and 52e, and the respective rotations detected by the encoders 156a and 156b. The number R is output to the panel conveyance control unit 90.

  When the storage phosphor panel P swings due to impact, vibration, or the like applied to the reading device 152 and the image cannot be reliably read due to the influence of the reading device control unit 80 constituting the reading device 152. Vibration value (acceleration) is preset as a set value S, and a vibration determination unit 158 that determines whether or not the detected value V detected by the vibration sensor 154 is larger than the set value S is provided. Note that the detected value V to be compared with the set value S is a value having a larger value among accelerations detected in at least two axial directions.

  The vibration determination unit 158 is connected to the scanning unit control unit 84 that controls the scanning unit 66 and the panel conveyance control unit 90 that conveys the stimulable phosphor panel P. Then, the detection value V detected by the vibration sensor 154 is output to the vibration determination unit 158, and when it is determined that the detection value V is smaller than the set value S (V <S), the storage fluorescence. The body panel P is sub-scanned and transported between the first and second rollers 52d and 52e, and the stimulable phosphor panel P is main-scanned by the laser beam LB from the excitation unit 68, thereby reading the radiation image information. Done continuously.

  On the other hand, when some impact is applied to the radiation image forming system 150 including the reading device 152, the reading device 152 is vibrated and it is determined that the detection value V by the vibration sensor 154 is larger than the set value S ( V> S), as shown in FIG. 9, the control signal is output from the vibration determination unit 158 to the scanning unit control unit 84 and the panel transport control unit 90, and the stop from the scanning unit control unit 84 The derivation of the laser beam LB from the excitation unit 68 is stopped based on the signal, and the rotations of the first and second nip rollers 52d and 52e are stopped based on the stop signal from the panel conveyance control unit 90, so The sub-scanning conveyance of the body panel P is stopped. Thereby, when vibration occurs in the reading device 152, the reading of the stimulable phosphor panel P can be stopped to reliably prevent a decrease in image reading accuracy.

  Further, the rotation of the first and second nip rollers 52d and 52e is stopped by the stop signal output based on the detection value T1 from the detection time T1 when the detection value V equal to or greater than the set value S is detected by the vibration sensor 154, Transport of the stimulable phosphor panel P transported between the detection time T1 and the stop time T2 based on the time difference T2-T1 from the stop time T2 to the stop time T2 when the actual transport of the stimulable phosphor panel P stops. A distance L is calculated. As for the transport distance L, the rotation speed R of the first and second nip rollers 52d and 52e when the stimulable phosphor panel P is transported in the sub-scanning is detected by the encoders 156a and 156b, respectively, and the rotation speed R is controlled by the panel transport control. By outputting to the unit 90, the panel conveyance control unit 90 calculates the relationship between the rotational speed R, the time difference T2-T1, and the circumferential length F of the first and second nip rollers 52d and 52e.

That is, the rotation speed R of the first and second nip rollers 52d, 52e, the time difference T2-T1 from the detection time T1 to the stop time T2, and the circumferential length F of the first and second nip rollers 52d, 52e are multiplied. By doing so, the transport distance L of the stimulable phosphor panel P is calculated.
L = R × (T2−T1) × F

  Then, in the state where the reading operation of the stimulable phosphor panel P and the sub-scanning conveyance are stopped, it is determined that the detected value V by the vibration sensor 154 is small again with respect to the set value S because the impact, vibration, etc. are settled. In the case (V <S), an activation signal is output from the panel conveyance control unit 90 to the first and second nip rollers 52d and 52e. This activation signal rotates the first and second nip rollers 52d and 52e in the reverse direction (arrow D direction), and subtracts the stimulable phosphor panel P in the opposite direction (arrow B direction) by the calculated transport distance L. Scan and convey. In this case, the conveyance distance L of the stimulable phosphor panel P is detected based on the rotation speed R of the first and second nip rollers 52d and 52e, and after the conveyance distance L is conveyed, the first and second nip rollers 52d and 52e are conveyed. It stops by outputting a stop signal from the panel conveyance control unit 90 to the nip rollers 52d and 52e.

  That is, the stimulable phosphor panel P returns to the transport position immediately before the vibration is applied to the reading device 152.

  As described above, after the stimulable phosphor panel P returns to the predetermined position, the activation signal for rotating the first and second nip rollers 52d and 52e in the forward direction (arrow C direction) is output and driven to rotate. As a result, the stimulable phosphor panel P is conveyed in the sub-scanning direction, and an activation signal is output from the scanning unit control unit 84 to the excitation unit 68, and the laser beam LB is again sent from the excitation unit 68 to the stimulable phosphor panel P. Is derived. Thereby, reading of the radiation image information of the stimulable phosphor panel P by the reading unit is resumed. As a result, it is possible to read again the portion of the reading device 152 that has been transported and read after the vibration has occurred until the transport of the stimulable phosphor panel P actually stops. . Thereby, highly accurate image reading can be performed without vibration.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change freely in the range which does not deviate from the main point of this invention.

  For example, the X-ray source 16 that constitutes the imaging apparatus is connected to the reading devices 26 and 152 that constitute the radiation image forming systems 10 and 150, but is configured independently of the imaging apparatus and disposed in the imaging room. The present invention can also be applied to a reading apparatus.

1 is a configuration diagram of a radiation image forming system according to a first embodiment of the present invention. It is an internal block diagram of the reader mounted in a mobile radiation apparatus. It is a control block diagram of a radiographic image forming system. FIG. 3 is an enlarged configuration diagram illustrating the vicinity of a reading unit in the reading device of FIG. 2. FIG. 5A is an explanatory view showing a state in which the front end in the transport direction of the stimulable phosphor panel is held by the first nip roller, and FIG. 5B is a diagram in which the front and rear ends of the stimulable phosphor panel are the first and second nip rollers. FIG. 5C is an explanatory view showing a state in which only the rear end of the stimulable phosphor panel is held by the second nip roller. It is an internal block diagram of the reader which comprises the radiographic image formation system which concerns on the 2nd Embodiment of this invention. It is an enlarged block diagram which shows the reading part vicinity in the reading apparatus of FIG. It is a control block diagram of a radiographic image forming system. FIG. 9 is a control block diagram illustrating a relationship among a reading device control unit, a scanning unit control unit, and a panel conveyance control unit in the radiographic image forming system of FIG. 8. FIG. 10A is an explanatory diagram showing a detection time when the front end in the transport direction of the stimulable phosphor panel is held by the first nip roller and vibration is detected by the vibration sensor 154, and FIG. 10B is based on the detection result of the vibration sensor. It is explanatory drawing which shows the time of the stop which rotation of the 1st and 2nd nip roller stopped, and conveyance of a stimulable phosphor panel stopped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 150 ... Radiation image forming system 12 ... Cart 14 ... Console 16 ... X-ray source 20 ... X-ray 22 ... X-ray source control device 24 ... Cassette 26, 152 ... Reading device 27 ... Travel control device 28 ... Transceiver 30a ... Arm member 30b ... post portion 31 ... electromagnetic lock 36 ... casing 38 ... cassette loading portions 54a-54f ... guide plates 55a-55d ... sensor 60 ... erasing unit 66 ... scanning unit 67a ... first position detection sensor 67b ... second position detection Sensor 68 ... Excitation unit 80 ... Reader control unit 84 ... Scanning unit control unit 86 ... Erasing unit control unit 90 ... Panel transport control unit 94 ... Front wheel 96 ... Rear wheel 98 ... Drive motor 100 ... Electromagnetic brake 154 ... Vibration sensor 156a, 156b ... Encoder 158 ... Vibration determination unit

Claims (7)

A radiation source that irradiates the subject with radiation, a radiation conversion panel that records radiation image information obtained by converting radiation transmitted through the subject, a transport mechanism that transports the radiation conversion panel, and a radiation conversion panel In addition, the mobile radiation device is mounted on a carriage with an image reading unit for reading the radiation image information,
The transport mechanism has at least two pairs of nip rollers that freely hold the radiation conversion panel;
Detecting means for detecting a holding state of the radiation conversion panel by the two pairs of nip rollers;
Operation restriction means for restricting the operation of a vibration source that vibrates the radiation conversion panel based on the holding state of the radiation conversion panel detected by the detection means;
A mobile radiation apparatus comprising: The apparatus of claim 1.
The mobile radiation apparatus according to claim 1, wherein the detection means includes a position detection sensor that is provided in the vicinity of one nip roller and the other nip roller, and is capable of detecting a transport position of the radiation conversion panel. The apparatus of claim 2.
The movement limiting means is based on a control signal from a control unit when the position detection sensor detects that only one of both ends of the radiation conversion panel in the transport direction is held by the two pairs of nip rollers. A mobile radiation device comprising a lock mechanism that electrically regulates the operation of the vibration source. The device according to any one of claims 1 to 3,
The vibration generating source is a movable radiation provided on the carriage, and a movable arm that is movable under a driving action of a motor and that can move the radiation source to a position facing the subject. apparatus. The apparatus of claim 1.
The detection means is provided in the vicinity of one nip roller and the other nip roller, respectively, and a position detection sensor capable of detecting the transport position of the radiation conversion panel;
A vibration detection sensor capable of detecting vibration applied to the image reading unit;
Consists of
The mobile radiation apparatus, wherein reading by the image reading unit is stopped when a detection value detected by the vibration detection sensor exceeds a predetermined value. A radiation source that irradiates the subject with radiation, a conveyance mechanism that has at least two pairs of nip rollers and conveys a radiation conversion panel on which radiation image information is recorded, and reads the radiation image information recorded on the radiation conversion panel A method for controlling a mobile radiation apparatus that mounts an image reading unit on a carriage,
Detecting a holding state of the radiation conversion panel by the two pairs of nip rollers with a position detection sensor;
Determining a holding state at both ends in the transport direction of the radiation conversion panel by the nip roller based on a detection result by the position detection sensor;
A step of limiting the drive of the vibration generating source by the movement limiting means when it is determined that only one of both ends in the transport direction is held in the radiation conversion panel;
A control method for a mobile radiation apparatus, comprising: The control method according to claim 6, wherein
Detecting the conveyance position of the radiation conversion panel with the position detection sensor and simultaneously detecting the vibration with the vibration detection sensor;
A step of comparing the detected value with a preset value when the vibration is detected;
A step of stopping reading of the image reading unit when it is determined that the detection value is larger than the set value;
A control method for a mobile radiation apparatus, comprising:

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