JP2011120776A - Medical image diagnostic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus capable of providing comfortable scanning for a patient, and capable of preventing retrial of scanning caused by a physiological phenomenon and unnecessary exposure of the patient. <P>SOLUTION: The X-ray CT apparatus 1 includes a top board 28 on which a subject O can be placed, and a switch 33 set in such a range as can be operated by the subject O placed on the top board 28 for indicating at least the start of waiting period suggesting the start of the waiting time for scanning. After the elapse of the waiting period for scanning, scanning is executed and an image is generated based on the data collected by the scanning. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a medical image diagnostic apparatus that generates image information of a subject.

  In the medical field, various types of medical image diagnostic apparatuses have been conventionally used. X-ray CT (computed tomography) apparatus, MRI (magnetic resonance imaging) apparatus, ultrasonic diagnostic apparatus, X-ray diagnostic apparatus, nuclear medicine diagnostic apparatus, and the like are typical examples of medical image diagnostic apparatuses.

  An X-ray CT (computed tomography) apparatus as an example of a medical image diagnostic apparatus provides information about a subject as an image based on the intensity of the X-ray transmitted through the subject. Diagnosis / treatment of a disease It plays an important role in many medical practices such as surgery planning.

  As is well known, the X-ray CT apparatus includes an X-ray tube and an X-ray detector arranged to face each other with a subject interposed therebetween, while rotating the X-ray tube and the X-ray detector relative to the subject. CT imaging for performing X-ray irradiation and detection is executed. Then, projection data indicating the degree of X-ray attenuation (the degree of X-ray absorption by the subject) is collected for each rotation angle in the CT imaging process, and a tomographic image (CT image) of the subject is obtained based on the obtained projection data. Generated.

  Here, if a region to be imaged such as an organ moves in accordance with the body movement of the subject such as respiratory motion during the CT imaging (scanning) by the X-ray CT apparatus, an artifact is generated in the finally obtained CT image. appear. Therefore, conventionally, a respiratory synchronization scan, etc. has been proposed in which a respiratory signal based on the respiratory motion of a subject is detected and CT imaging is performed in accordance with a phase in which the movement of an organ caused by respiration can be regarded as almost stationary. (For example, refer to Patent Documents 1-3.)

JP 2000-139892 A JP 2006-319441 A JP 2009-213533 A

  However, the conventional X-ray CT apparatus does not have a function of waiting for the start of scanning on the patient side. Therefore, when a scan is performed using a conventional X-ray CT apparatus, the patient placed on the top board immediately before the scan makes an intention (“physiological phenomenon such as coughing and sneezing) It is necessary for the patient to endure the physiological phenomenon such as coughing and sneezing until the end of the scan without being able to convey the periodic movement of his body or the periodic movement of his body).

  On the other hand, when performing a respiration-synchronized scan using a conventional X-ray CT apparatus, if the patient immediately before the scan cannot withstand the physiological phenomenon and causes the physiological phenomenon, abnormal breathing due to the physiological phenomenon occurs, and the respiratory Synchronous scans sometimes failed. If the respiratory synchronization scan fails, there is a problem that the scan is re-executed and the burden on the patient increases. In particular, when scanning is performed again with an X-ray CT apparatus using X-rays, there is a problem of unnecessary exposure to the patient.

  The present invention has been made in consideration of the above-described circumstances, and provides an X-ray CT apparatus capable of realizing a scan comfortable for a patient and avoiding re-scanning and unnecessary exposure to a patient due to a physiological phenomenon. For the purpose.

  In order to solve the above-described problems, an X-ray CT apparatus according to the present invention is provided within a range in which a subject can be placed and a range in which the subject placed on the placement means can be operated. An operation unit that is installed and at least instructs the start of a waiting period indicating the start of a waiting period for scanning, a scanning execution unit that executes the scanning after the waiting period has elapsed, and an image based on data collected by the scanning And image generation means for generating.

  According to the X-ray CT apparatus of the present invention, it is possible to realize a scan that is comfortable for the patient, and to avoid re-scanning and unnecessary exposure to the patient due to physiological phenomena.

The hardware block diagram which shows the X-ray CT apparatus of this embodiment. The perspective view of the X-ray CT apparatus which shows the 1st example of arrangement | positioning of the switch of the X-ray CT apparatus of this embodiment. The top view of the top plate which shows the 2nd example of arrangement | positioning of the switch of the X-ray CT apparatus of this embodiment. The flowchart which shows operation | movement of the X-ray CT apparatus of this embodiment. The figure for demonstrating the relationship between a respiration signal (respiration waveform) and the waiting period of a respiration synchronous scan. The figure for demonstrating the waiting period of a respiration synchronous scan.

  An embodiment of a medical image diagnostic apparatus according to the present invention will be described with reference to the accompanying drawings. In the present embodiment, description will be made using an X-ray CT apparatus as an example of a medical image diagnostic apparatus.

  The X-ray CT apparatus of this embodiment includes a rotation / rotation (ROTATE / ROTATE) type in which an X-ray tube and an X-ray detector are rotated as one body, and a large number of detection elements in a ring shape. There are various types, such as a fixed / rotation type (STATIONARY / ROTATE) type in which only the X-ray tube rotates around the subject, and the present invention can be applied to any type. Here, the rotation / rotation type that currently occupies the mainstream will be described.

  In addition, the mechanism for converting incident X-rays into electric charges is based on an indirect conversion type in which X-rays are converted into light by a phosphor such as a scintillator, and the light is further converted into electric charges by a photoelectric conversion element such as a photodiode. The generation of electron-hole pairs in semiconductors and their transfer to the electrode, that is, the direct conversion type utilizing a photoconductive phenomenon, is the mainstream.

  In addition, in recent years, a so-called multi-tube type X-ray CT apparatus in which a plurality of pairs of an X-ray tube and an X-ray detector are mounted on a rotating ring has been commercialized, and development of peripheral technologies has been advanced. . The X-ray CT apparatus of the present embodiment can be applied to both a conventional single-tube type X-ray CT apparatus and a multi-tube type X-ray CT apparatus. Here, a single tube X-ray CT apparatus will be described.

  FIG. 1 is a hardware configuration diagram showing the X-ray CT apparatus of the present embodiment.

  FIG. 1 shows an X-ray CT apparatus 1 of the present embodiment. The X-ray CT apparatus 1 mainly includes a scanner device 11 and an image processing device 12. The scanner device 11 of the X-ray CT apparatus 1 is usually installed in an examination room and is configured to generate X-ray transmission data regarding an imaging region of a subject (human body) O. On the other hand, the image processing apparatus 12 is usually installed in a control room adjacent to the examination room, and is configured to generate projection data based on transmission data and generate / display a reconstructed image.

  The scanner device 11 of the X-ray CT apparatus 1 includes an X-ray tube 21, an X-ray detector 22, an aperture 23, a main controller 24, a high voltage generator 25, an aperture drive device 26, a rotation drive device 27, a top plate 28, and a ceiling plate. A plate driving device (bed device) 29, a DAS (data acquisition system) 30, a respiration detector 31, an arm up holder 32, a subject operation member such as a switch 33, and IFs (interfaces) 34a and 34b are provided.

  The X-ray tube 21, the X-ray detector 22, the diaphragm 23, and the DAS 30 are held by a rotating unit R of a gantry (not shown) of the scanner device 11. The rotating unit R can rotate around the subject O as a whole with the X-ray tube 21, the X-ray detector 22, the diaphragm 23 and the DAS 30 in a state where the X-ray tube 21 and the X-ray detector 22 face each other. It is configured.

  The X-ray tube 21 irradiates X-rays toward the X-ray detector 22 according to the tube voltage supplied from the high voltage generator 25. Fan beam X-rays and cone beam X-rays are formed by X-rays emitted from the X-ray tube 21.

  The X-ray detector 22 is a one-dimensional array type X-ray detector having a plurality of rows in the channel direction and one column of X-ray detection elements in the slice direction (column direction). Alternatively, the X-ray detector 22 is a matrix, that is, a two-dimensional array type X-ray detector 22 (also referred to as a multi-slice detector) having a plurality of rows of X-ray detector elements in the channel direction and a plurality of columns in the slice direction. .) The X-ray detector 22 detects X-rays emitted from the X-ray tube 21.

  The diaphragm 23 adjusts the irradiation range in the slice direction of the X-rays emitted from the X-ray tube 21 by the diaphragm driving device 26. That is, by adjusting the aperture of the diaphragm 23 by the diaphragm driving device 26, the X-ray irradiation range in the slice direction can be changed.

  The main controller 24 controls the high voltage generation device 25, the aperture drive device 26, the rotation drive device 27, the DAS 30, and the like based on the control signal input from the image processing device 12 via the IF 34a, and performs breath synchronization. Let me scan. In the respiratory synchronization scan, the top plate 28 is stopped every time the respiratory phase of the subject O based on a respiratory signal described later is recognized and moved by the width of the X-ray detector 22 in the slice direction, and imaging is performed only with an arbitrary respiratory phase. It is a method of performing.

  The high voltage generator 25 supplies power necessary for X-ray irradiation to the X-ray tube 21 under the control of the main controller 24. The high voltage generator 25 includes a high voltage transformer, a filament heating converter, a rectifier, a high voltage switch, and the like (not shown).

  The diaphragm driving device 26 adjusts the irradiation range of the diaphragm 23 in the X-ray slice direction under the control of the main controller 24.

  Under the control of the main controller 24, the rotation drive device 27 rotates the rotation unit R so that the rotation unit R rotates around the cavity while maintaining the positional relationship.

  The top plate 28 can place the subject O thereon.

  The top board drive device 29 moves the top board 28 along the z-axis direction under the control of the main controller 24. The central portion of the rotating portion R has an opening, and the subject O placed on the top plate 28 of the opening is inserted. A direction parallel to the rotation center axis of the rotating part R is defined as a z-axis direction, and a plane orthogonal to the z-axis direction is defined as an x-axis direction and a y-axis direction.

  The DAS 30 amplifies the transmission data signal detected by each X-ray detection element of the X-ray detector 22 and converts it into a digital signal. Output data of the DAS 30 is supplied to the image processing apparatus 12 via the IF 34b of the scanner apparatus 11.

  The respiratory detector 31 is attached to the subject O. The respiration detector 31 captures the movement of the body surface due to the respiration of the subject O, generates a respiration signal as an electric signal, amplifies it, removes noise from the amplified signal, and converts it into a digital signal. The respiration detector 31 sends a digitized respiration signal to the main controller 24.

  The arm up holder 32 is detachably attached to the top plate 28 on which the subject O is placed. As shown in FIG. 3, the arm up holder 32 is used for separating the arm from the chest by holding the subject O in the hand of the subject O when the chest of the subject O is scanned.

  The switch 33 is installed within a range that can be operated by the subject O placed on the top board 28.

  FIG. 2 is a perspective view of the X-ray CT apparatus 1 showing a first arrangement example of the switch 33 of the X-ray CT apparatus 1 of the present embodiment. FIG. 3 is a top view of the top plate 28 showing a second arrangement example of the switch 33 of the X-ray CT apparatus 1 of the present embodiment.

  As shown in FIGS. 2 and 3, at least one of the switches 33 a, 33 b, 33 c, and 33 d as the switch 33 is installed in a range that can be operated by the subject O placed on the top board 28. The switch 33 instructs the main controller 24 to start at least a scan standby period.

  As shown in FIG. 2, the switch 33a is a handy type that can be held by the hand of the subject O, and sends an instruction to the main controller 24 via wireless communication or wired communication.

  The switch 33 b is installed on the side surface of the top board 28 on which the subject O is placed, and sends an instruction to the main controller 24.

  The switch 33 c is installed on the outer wall of a gantry G having a cavity through which the top plate 28 is advanced and retracted, and sends an instruction to the main controller 24. The switch 33c is preferably installed on the outer wall above the locus close to the locus in which the top board 28 advances and retreats.

  As shown in FIG. 3, the switch 33d is installed in the arm up holder 32 that can be attached to and detached from the top plate 28 on which the subject O is placed, and sends an instruction to the main controller 24 via wireless communication or wired communication.

  Although the subject operation member has been described as the switch 33 with reference to FIGS. 1 to 3, the present invention is not limited to this case. For example, examples of other subject operation members include sensors such as a light (visible light or infrared light) sensor and a thermal sensor.

  The IFs 34a and 34b shown in FIG. 1 are respectively configured by connectors according to parallel connection specifications and serial connection specifications, and perform communication control according to each standard. The IFs 34a and 34b communicate with the image processing apparatus 12, and are connected to the IFs 44a and 44b of the image processing apparatus 12, respectively.

  The image processing apparatus 12 of the X-ray CT apparatus 1 is configured based on a computer, and can communicate with a network N such as a hospital basic LAN (local area network). The image processing device 12 is mainly composed of basic hardware such as a CPU (central processing unit) 41, a memory 42, an HDD (hard disc drive) 43, IFs 44a, 44b, 44c, an input device 45, and a display device 46. Is done. The CPU 41 is interconnected to each hardware component constituting the image processing device 12 via a bus as a common signal transmission path. Note that the image processing apparatus 12 may include a recording medium drive 47.

  The CPU 41 is a control device having a configuration of an integrated circuit (LSI) in which an electronic circuit made of a semiconductor is enclosed in a package having a plurality of terminals. When a command is input by operating the input device 45 by an operator such as a doctor, the CPU 41 executes a program stored in the memory 42. Alternatively, the CPU 41 is read from a program stored in the HDD 43, a program transferred from the network N and received by the IF 44 c and installed in the HDD 43, or read from a recording medium attached to the recording medium drive 47 and installed in the HDD 43. The loaded program is loaded into the memory 42 and executed.

  The memory 42 is a storage device having a configuration that combines elements such as a ROM (read only memory) and a RAM (random access memory). The internal storage device stores IPL (initial program loading), BIOS (basic input / output system) and data, and is used for temporary storage of the work memory of the CPU 41 and data.

  The HDD 43 is a storage device having a configuration in which a metal disk coated or vapor-deposited with a magnetic material is incorporated in a non-detachable manner. The HDD 43 is a storage device that stores programs installed in the image processing apparatus 12 (including an OS (operating system) in addition to application programs) and data. In addition, the OS can be provided with a graphical user interface (GUI) that can use the graphics for displaying information to the operator and perform basic operations with the input device 45.

  The IFs 44a, 44b, and 44c are each configured by a connector that conforms to a parallel connection specification or a serial connection specification, and performs communication control according to each standard. The IFs 44a and 44b communicate with the scanner device 11, and are connected to the IFs 34a and 34b of the scanner device 11, respectively. Further, the IF 44c has a function capable of being connected to the network N, whereby the image processing apparatus 12 can be connected to the network N network from the IF 44c.

  The input device 45 is a pointing device that can be operated by an operator, and an input signal according to the operation is sent to the CPU 41.

  The display device 46 includes an image synthesis circuit (not shown), a MUX (multiplexer), a storage memory, a display memory (VRAM: video random access memory), a D / A (digital to analog) conversion circuit, a video encoder, a monitor, and the like. It is out. The image synthesizing circuit generates display data obtained by synthesizing the reconstructed image and the like together with character information and scales of various parameters, and outputs the display data to the MUX. The MUX appropriately switches the display data output in order to avoid flickering of the display on the monitor due to the conflict between the output to the storage memory and the output to the display memory. The storage memory stores each display data for each reconstructed image output from the MUX as a moving image file such as an AVI (audio video interleaving) file. On the other hand, the reconstructed image output from the MUX is temporarily stored as image data.

  The D / A conversion circuit converts display data output from the MUX or VRAM into an analog signal. The video encoder performs a predetermined encoding process on the display data and outputs it to the monitor as a video signal. The monitor includes a liquid crystal display, a cathode ray tube (CRT), and the like, and sequentially displays display data.

  The recording medium drive 47 can be attached to and detached from the recording medium, reads out data (including a program) recorded on the recording medium, outputs the data on the bus, and outputs data supplied via the bus. Write to a recording medium. Such a recording medium can be provided as so-called package software.

  The image processing device 12 generates projection data by performing logarithmic conversion processing and correction processing (preprocessing) such as sensitivity correction on the raw data in the respiratory synchronization scan input from the DAS 30 of the scanner device 11. Further, the image processing device 12 performs scattered radiation removal processing on the preprocessed projection data. The image processing device 12 removes scattered radiation based on the value of the projection data within the X-ray exposure range, and based on the projection data to be subjected to scattered radiation correction or the value of the adjacent projection data. The estimated scattered radiation is subtracted from the target projection data to perform scattered radiation correction. The image processing device 12 generates a reconstructed image based on the corrected projection data.

  Next, the operation of the X-ray CT apparatus 1 of the present embodiment will be described using the flowchart shown in FIG.

  After the subject O is placed on the top board 28, the main controller 24 (or CPU 41) of the X-ray CT apparatus 1 determines whether or not there is an instruction from the switch 33 to start a waiting period for the respiratory synchronization scan ( Step ST1). If the determination in step ST1 is YES, that is, if it is determined that there is an instruction to start the waiting period for the respiratory synchronization scan from the switch 33, the main controller 24 starts the waiting period for the respiratory synchronization scan (step ST2).

  Next, the main controller 24 determines whether or not a predetermined period for waiting for the start of the respiratory synchronization scan is stored in the X-ray CT apparatus 1 in advance (step ST3). If YES in step ST3, that is, if it is determined that a predetermined period for waiting for the start of the respiratory synchronization scan is stored in the X-ray CT apparatus 1 in advance, the main controller 24 determines that the respiratory synchronization scan standby period. It is determined whether or not the stored predetermined period has elapsed from the start (step ST4). If YES in step ST4, that is, if it is determined that a predetermined period has elapsed since the start of the waiting period for the respiratory synchronization scan, the main controller 24 ends the waiting period for the respiratory synchronization scan (step ST5).

  Next, it is determined whether or not there is an instruction to perform a respiratory synchronous scan from the input device 45 by the operator (step ST6). If the determination in step ST6 is YES, that is, if it is determined that there is an instruction to execute a respiratory synchronization scan, the main controller 24 starts the respiratory synchronization scan and executes the respiratory synchronization scan (step ST7). On the other hand, if the determination in step ST6 is NO, that is, if it is determined that there is no instruction for executing the synchronized breathing scan, the main controller 24 performs step ST7 until there is an instruction for executing the synchronized breathing scan from the input device 45 by the operator. Continue to judge.

  If NO in step ST3, that is, if it is determined that the predetermined period for waiting for the start of the respiratory synchronization scan is not stored in the X-ray CT apparatus 1 in advance, the main controller 24 waits for a scan from the switch 33. It is determined whether or not there is an instruction to end the period (step ST8). If YES in step ST8, that is, if it is determined that there is an instruction to end the waiting period for the respiratory synchronization scan from the switch 33, the main controller 24 ends the waiting period for the respiratory synchronization scan (step ST5).

  Here, during the waiting period from the start of the waiting period for the breath-synchronized scan in step ST2 to the end of the waiting period for the breath-synchronizing scan in step ST5, the X-ray CT apparatus 1 is in a state where the execution of the breath-synchronizing scan is not allowed. Even if the operator in the control room gives an instruction to execute a breath-synchronized scan from the input device 45 during the waiting period of the breath-synchronized scan, the main controller 24 does not execute the breath-synchronized scan. Note that the main controller 24 performs breathing from a display device 46, a speaker (not shown), etc. in the control room during the waiting period from the start of the waiting period of the breath synchronization scan in step ST2 to the end of the waiting period of the breath synchronization scan in step ST5. You may comprise so that an operator may be notified that execution of a synchronous scan is not permitted.

  On the other hand, if the determination in step ST1 is NO, that is, if the switch 33 determines that there is no instruction to start the waiting period for the breath synchronization scan, the main controller 24 instructs the operator to execute the breath synchronization scan from the input device 45. It is determined whether or not there is (step ST6). When the determination in step ST4 is NO, that is, when it is determined that the predetermined period has not elapsed since the start of the waiting period for the respiratory synchronization scan, the main controller 24 performs steps until the predetermined period elapses from the start of the waiting period for the respiratory synchronization scan. Continue the determination of ST4. If the determination in step ST8 is NO, that is, if it is determined that there is no instruction from the switch 33 to end the waiting period for the respiratory synchronization scan, the main controller 24 performs step until there is an instruction from the switch 33 to end the waiting period for the respiratory synchronization scan. Continue the determination of ST8.

  FIG. 5 is a diagram for explaining a relationship between a respiration signal (respiration waveform) and a waiting period for a respiration synchronization scan.

  When a physiological phenomenon such as coughing and sneezing occurs in the subject O, the body of the subject O moves or the periodic movement of the body of the subject O stops, so as shown in the center part of FIG. An abnormality occurs in the respiratory waveform. In that case, the respiratory synchronization scan cannot be performed accurately due to the abnormal waveform.

  FIG. 6 is a diagram for explaining a waiting period of a respiratory synchronization scan.

  The subject O presses the button 33 in advance when his / her body is likely to move due to physiological phenomena such as coughing and sneezing, or when his / her body's periodic movement is likely to stop. When the subject O determines that the physiological phenomenon has stopped, the subject O releases the pressed switch 33. In this case, in step ST8, as shown in mode I in the upper part of FIG. 6, from the start of the waiting period of the breath synchronization scan in which the switch 33 is pressed, the waiting period of the breath synchronization scan in which the pressed switch 33 is released is ended. Is determined as the waiting period for the respiratory synchronization scan.

  Alternatively, the subject O presses / releases the button 33 in advance when his / her body is likely to move due to a physiological phenomenon, or when his / her body's periodic movement is likely to stop. When the subject O determines that the physiological phenomenon has stopped, the subject O presses and releases the switch 33 again. In this case, in step ST8, as shown in the mode II in the middle of FIG. 6, from the start of the breath synchronization scan standby period in which the switch 33 is released to the end of the breath synchronization scan standby period in which the switch 33 is released again. Is determined as a waiting period for the respiratory synchronization scan.

  In addition, the subject O presses / releases the button 33 in advance when his / her body is likely to move due to a physiological phenomenon, or when his / her body's periodic movement is likely to stop. In this case, when a predetermined period is set in advance in the determination of step ST2, in step ST4, as shown in mode III in the lower part of FIG. From the start of the waiting period of the respiratory synchronization scan to the end of the waiting period of the respiratory synchronization scan after a predetermined period set in advance, it is determined as the waiting period of the respiratory synchronization scan. Note that, in step ST4, regardless of the instruction to end the waiting period of the breath-synchronized scan from the switch 33, the waiting period of the breath-synchronizing scan ends after a predetermined period from the start of the waiting period of the breath-synchronizing scan.

  According to the modes I and II shown in FIG. 6, the subject O himself / herself sets a period (waiting period) in which the subject O can recognize the body motion and the periodic motion disturbance, so that the body motion and the period of the subject O are set. Respiratory synchronization scans can be performed avoiding movement disturbances. Further, according to mode III, the subject O himself / herself sets the start of the disturbance of the body motion and the periodic motion that the subject O can perceive (start of the waiting period), so that the body motion of the subject O and the disturbance of the periodic motion are suppressed. The respiratory synchronization scan can be executed while avoiding the risk of missing the contrast timing due to the standby period that is too long based on the end of the standby period of the respiratory synchronization scan set by the subject O.

  In the present embodiment, the X-ray CT apparatus 1 has been described. However, the present invention is not limited to the X-ray CT apparatus. For example, the present invention may be an MRI apparatus or the like with a respiratory synchronization scan.

  In the present embodiment, the standby period in the case of the respiratory synchronization scan is set. However, the present invention is not limited to this case. For example, the present invention can be applied to a scan for performing respiration synchronization reconstruction in which respiration phase information is simultaneously collected while performing helical scan and image reconstruction is performed from data of any respiration phase. The breath synchronization scan and the scan for performing the breath synchronization reconstruction can be selected according to the case and the state of the examinee. Further, for example, the present invention can be applied to an X-ray CT apparatus that does not include a respiratory detector 31 that is not necessary for a respiratory synchronization scan or a scan for performing respiratory synchronization reconstruction and does not require respiratory synchronization.

  In the conventional X-ray CT apparatus, the operator of the control room asks the operator of the test room O (“the body will move due to physiological phenomena such as coughing and sneezing”) or “periodic movement of the body itself”. However, the scan was started by the operator of the control room against the will of the subject O in the examination room. However, according to the X-ray CT apparatus 1 of the present embodiment, the minimum necessary intention of the subject O in the laboratory can be communicated to the operator of the control room, so that a comfortable scan for the patient can be realized and the physiological It is possible to avoid re-scanning due to the phenomenon and unnecessary exposure to the patient.

DESCRIPTION OF SYMBOLS 1 X-ray CT apparatus 11 Scanner apparatus 12 Image processing apparatus 21 X-ray tube 22 X-ray detector 24 Main controller 28 Top plate 31 Respiration detector 32 Arm up holder 33, 33a, 33b, 33c, 33d Switch

Claims (12)

A placement means capable of placing a subject;
An operating means that is installed within a range that can be operated by the subject placed on the placing means, and that at least indicates a waiting period start indicating a start of a scanning waiting period;
Scan execution means for executing the scan after the standby period has elapsed;
Image generating means for generating an image based on data collected by the scan;
A medical image diagnostic apparatus comprising: Means for obtaining a respiratory signal of the subject;
The medical image diagnostic apparatus according to claim 1, wherein the scan execution unit executes a respiratory synchronization scan based on the respiratory signal. The medical image diagnostic apparatus according to claim 2, wherein the operation unit is a handy type. The medical image diagnostic apparatus according to claim 2, wherein the operation unit is installed on an arm-up holder that is detachable from the mounting unit. The medical image diagnostic apparatus according to claim 2, wherein the operation unit is installed in the mounting unit. A pedestal having a cavity through which the placing means is advanced and retracted;
The medical image diagnosis apparatus according to claim 2, wherein the operation unit is installed on an outer wall of the gantry. The medical image diagnostic apparatus according to claim 3, wherein the operation unit is a switch. 8. The medical use according to claim 7, wherein the scan execution means sets the waiting period from the start of the waiting period when the switch is pressed to the end of the waiting period when the pressed switch is released. Diagnostic imaging device. 8. The medical use according to claim 7, wherein the scan execution unit sets the waiting period from the start of the waiting period when the switch is pressed to the end of the waiting period after the start of the waiting period. Diagnostic imaging device. The scan execution means sets the waiting period from the start of the waiting period when the pressed switch is released to the end of the waiting period when the pressed switch is released again. The medical image diagnostic apparatus according to claim 7. The medical image diagnostic apparatus according to claim 3, wherein the operation unit is an optical sensor or a thermal sensor. The medical image diagnostic apparatus according to any one of claims 8 to 11, further comprising means for notifying an operator that the execution of the respiratory synchronization scan is impossible during the waiting period.

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