JP2012110355A - Signal generating device for respiratory synchronization and body movement detection sensor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a body movement detection sensor capable of reliably detecting the body movement due to the respiration of a patient, which has high durability, does not obstruct photographing, and requires no skill.SOLUTION: The body movement detection sensor unit (11) is configured to include a first case (21) serving as a pressure part, a thin film sensor (23), and a second case (22) containing the thin film sensor (23). The first and second cases (21, 22) are communicated with each other by a coupling tube (25), and silicon oil (27) is sealed therein. The body movement detection sensor unit (11) is provided to a bed (3), and the pressure part (21) is inserted between the back side of the patient and a table (8) so as to detect the body movement.

Description

  The present invention is controlled based on a respiratory synchronization signal input from the outside, and is capable of suppressing the influence of body movement due to respiration, a CT scanning device, a PET device, a radiation therapy simulation device, a radiation The present invention relates to a respiratory synchronization signal generation device capable of generating and outputting the respiratory synchronization signal to a medical device such as a treatment device, and a body motion detection sensor for detecting a respiratory motion.

  A so-called tomography device is well known as a medical device that can take a tomographic image of a human body cut at an arbitrary part. A CT scan device that takes an image by exposing X-rays, and a patient is given a radioactive tracer. A PET apparatus that detects and captures gamma rays emitted from a radioactive tracer is known. In addition, medical equipment in which a predetermined device is added to a tomographic apparatus is also known, and so-called radiation therapy simulation apparatuses, radiation therapy apparatuses, and the like are known. The radiotherapy simulation apparatus is an apparatus that can take a tomographic image of a patient and perform a radiotherapy simulation based on the acquired tomographic image, thereby making a treatment plan. The radiotherapy apparatus is an apparatus that irradiates an affected area with radiation by an operator operating the apparatus based on a radiotherapy plan.

  As is well known in the art, the CT scanning apparatus is composed of a gantry having an opening with a predetermined inner diameter penetrating the central portion, a bed on which a patient lies, and a computer for processing data. Inside the gantry, an X-ray source that emits X-rays and a detector array composed of a large number of sensors that detect X-rays transmitted through the human body are arranged at positions facing each other across the opening. The radiation source and the detector array can be rotated in the circumferential direction around the opening. Then, the opening is configured so that a patient who is supine on the bed is inserted together with the bed. When a tomographic image is obtained with such a CT scanning apparatus, a patient who is lying on the bed by driving the bed is inserted into the opening of the gantry, and a predetermined region to be imaged is located in the X-ray exposure field. Like that. Then, while rotating the X-ray source and the detector array, X-rays are emitted from different directions, and the X-ray transmitted through the human body is detected by the detector array. When the data detected in this way is processed in an integrated manner by a computer, one tomographic image is obtained.

  In the tomography apparatus, a bed is driven to move a region to be imaged little by little, and a plurality of tomographic images are captured. If it does so, the site | part of imaging | photography object can be imaged in three dimensions. By the way, when taking a tomographic image, the patient is careful not to move on the bed, but the patient moves due to a slight movement, that is, a body movement due to a breathing movement or heartbeat. If the patient moves due to body movement, a shift occurs between a plurality of tomographic images to be photographed, so that a three-dimensional tomographic image cannot be obtained clearly. If it does so, a tumor cannot be overlooked in a diagnosis, or the position of a tumor cannot be pinpointed correctly. In addition, it is impossible to appropriately design a treatment plan in the radiotherapy simulation apparatus, and in the radiotherapy apparatus, a healthy tissue other than a tumor may be accidentally irradiated with radiation to be damaged.

  A tomographic method for obtaining a clear tomographic image is known in which a tomographic apparatus is controlled in synchronism with breathing motion and heartbeat to collect data with little deviation while minimizing the influence of body motion. When performing such a tomography method, it is necessary to detect the body movement of the human body and transmit it to the tomography apparatus. Patent Document 1 describes a CT scan device that obtains a heart beat synchronization signal by an electrocardiogram detection sensor affixed to a patient's chest and images a tomographic image of the heart. According to the CT scanning device described in Patent Document 1, since the CT scanning device is controlled in synchronization with the heartbeat, a tomographic image can be taken without being affected by the heartbeat, and a clear tomographic image of the heart can be obtained. can get. However, since the breathing operation is not taken into consideration, if a tomographic image of a part other than the heart is captured, the tomographic image becomes blurred due to the breathing motion. It is necessary to detect a respiratory action and transmit a synchronization signal to the tomography apparatus. Known methods for detecting the movement of breathing include, for example, a method for detecting vertical movement of the chest, a method for detecting expansion and contraction of the abdomen, and a method for detecting skin tension. The method of detecting the vertical movement of the chest includes a method using a marker and a method using a measuring rod. The method using the marker detects the vertical movement of the chest by monitoring the marker attached to the chest of the patient with an external CCD camera. In the method using a measuring rod, one end of the measuring rod is brought into contact with the patient's chest, a fulcrum of the measuring rod is provided near the patient, and the vertical movement of the chest is amplified at the other end. It is a method to detect. The method for detecting the expansion and contraction of the abdomen is a method for detecting the expansion and contraction of the abdomen by detecting the change in the tension of the belt wound around the abdomen or the air pressure in the hollow belt. Is a method in which a strain sensor is affixed to the patient's body surface and the tension of the skin is detected to detect breathing motion.

JP 2001-61835 A JP 2001-187030 A

  Patent Document 2 describes a sheet-like piezoelectric sensor that is provided on a bed on which a patient lies, and can detect body movement caused by a breathing action in contact with the patient's back. The piezoelectric sensor described in Patent Document 2 is a sensor having a so-called laminated structure in which a pressure detection element made of a PVDF film or an aluminum nitride thin film is sandwiched between thin resin sheets, and is a body movement caused by breathing motion. Can be detected as a change in voltage.

  If the method for detecting the breathing motion as described above is implemented or the piezoelectric sensor described in Patent Document 2 is used, the body movement due to the breathing motion can be detected. If the detected body movement signal is transmitted to the tomography apparatus, and the tomography apparatus scans synchronously based on the signal, a clear tomography that is not affected by the body movement due to breathing motion An image can be obtained. However, there are some problems to be solved. For example, in the case of a method using a marker, there is a problem of selecting a position where the marker is pasted. That is, when the marker is affixed to the patient's chest, it is necessary to affix the marker at a position that does not hinder the X-ray exposure and can ensure the stability of the marker. Furthermore, other problems arise because the marker is applied to the chest. That is, during tomographic imaging, the patient cannot wear a cold blanket, and when performing radiotherapy, the marker interferes with radiation irradiation. There is also a problem with the measurement method. In the measuring rod, the fixing tool for fixing the fulcrum hinders X-ray exposure, and the entire measuring rod may be reflected in the image. Furthermore, since the measuring rod protrudes to the outside, there is also a problem that it hits the gantry of the CT scanning device. There are also problems with the method of detecting abdominal expansion and contraction. That is, in a healthy person, both the diaphragm and the intercostal muscle move actively during breathing, but in the case of a patient with weak physical strength, the diaphragm functions insufficiently and shallow breathing due to fine movement of the intercostal muscle increases. Then, even if the abdomen is inflated and contracted by a belt or the like, respiration may not be detected accurately. Moreover, if a patient is pressed with a belt, it will become a patient's stress. There is also a problem with the method of detecting the skin tension, and if the patient's skin is slack, the accuracy of detection becomes worse, and the communication signal line connected to the strain sensor gets in the way. .

  When the piezoelectric sensor described in Patent Document 2 is used, many of the above problems are solved. For example, a piezoelectric sensor is provided on a bed on which the patient lies, and touches the patient's back to detect the movement of breathing. There is no such thing as hitting a photographic device. In addition, since the piezoelectric sensor is made of a PVDF film or an aluminum nitride thin film, it is relatively difficult to appear in a tomographic image. However, there is no guarantee that the piezoelectric sensor described in Patent Document 2 will not appear in the image at all depending on the configuration. There are also problems inherent to pressure sensing elements made of PVDF films or aluminum nitride thin films. That is, such a pressure detection element is not highly durable when exposed, and even if the pressure detection element is sandwiched between thin resin sheets, if the pressure detection element is repeatedly pressed by the patient's back, the pressure detection element deteriorates early. End up. If the thickness of the resin sheet sandwiching the pressure detection element is increased, the durability is improved to some extent, but another problem that the sensitivity of the sensor is lowered occurs. In addition, a signal line for transmitting the detected voltage to the outside is provided in such a pressure detection element. However, since the pressure detection element is formed in a thin film shape, the junction between the pressure detection element and the signal line The strength of is weak and problematic. In the case of the piezoelectric sensor described in Patent Document 2, since the pressure detection element is directly placed on the patient's back to detect pressure fluctuation, the joint portion is damaged early and the signal line is disconnected. There is a high risk of losing. In addition, since aluminum nitride can generally be manufactured only in a small area, the back portion where the change in pressure can be detected becomes a small area, and depending on the portion to be contacted, the respiratory action cannot be detected reliably. . Furthermore, since the pressure received from the patient's back does not necessarily act uniformly on the piezoelectric sensor, the pressure received by the pressure detection element may be uneven, and the sensor detection accuracy may not be sufficient. . That is, depending on the position, area, and the like where the patient's back is in contact with the piezoelectric sensor, fluctuations in pressure due to patient movement may not be detected accurately.

  The present invention has been made in view of the above-described problems. Specifically, the present invention does not appear in an image in tomography or interfere with radiotherapy, and does not collide with a tomography apparatus. , A low-cost and highly durable body motion detection sensor that can reliably detect patient motion due to patient breathing without requiring skill, and a respiratory synchronization signal synchronized with the breathing motion detected by this sensor, An object of the present invention is to provide a respiratory synchronization signal generation device capable of outputting a respiratory synchronization signal to medical equipment such as a tomography apparatus and a radiotherapy apparatus.

  In order to achieve the above-mentioned object, the present invention provides a body motion detection sensor comprising: a hollow container having a flexible and flat sheet shape; and a PVDF stored in the container or another container; A thin film sensor made of aluminum nitride or zinc oxide and a fluid hermetically or liquid-tightly sealed in these containers are integrally formed. And it is comprised so that the pressure which acts on a container may be detected by acting on a thin film sensor via a fluid. Further, such a container is inserted into the contact portion between the back surface of the patient and the table so that the area of the pressure receiving portion is larger than the area of the thin film sensor. Further, in the present invention, the body motion detection sensor is configured so that the hollow portion communicates with the hollow first container, the hollow second container, which is flexible and has a flat sheet shape as a whole. A conduit connecting them, a thin film sensor made of PVDF, aluminum nitride, or zinc oxide stored in a second container, and a fluid hermetically or liquid-tightly sealed inside the container The pressure applied to the first container is configured to be detected by acting on the thin film sensor via the fluid. Then, the apparatus is configured as a respiratory synchronization signal generation device that receives a change in pressure detected by such a body motion detection sensor and generates a respiratory synchronization signal synchronized with respiration.

Thus, in order to achieve the above object, the invention according to claim 1 is provided on a bed on which a patient lies in a medical device such as a CT scan device, a PET device, a radiation treatment simulation device, and a radiation treatment device. A sensor that is inserted into a contact portion between a patient's back and a table to detect a change in pressure associated with a breathing operation, and the sensor is stored in a flexible hollow container and the container A thin film sensor made of PVDF, aluminum nitride, or zinc oxide and a fluid hermetically or liquid-tightly sealed in the container are formed to form a flat sheet as a whole and act on the container. A pressure is configured to be detected by acting on the thin film sensor via the fluid.
According to a second aspect of the present invention, in the sensor according to the first aspect, in the container, the area of the pressure receiving portion inserted into the contact portion between the back surface of the patient and the table is larger than the area of the thin film sensor. Configured to be
According to a third aspect of the present invention, there is provided a medical device such as a CT scan device, a PET device, a radiation treatment simulation device, or a radiation treatment device, which is provided on a bed on which a patient lies, A sensor that is inserted into a contact portion to detect a change in pressure associated with breathing motion, the sensor having a hollow first container that is flexible and has a flat sheet shape, and a hollow A second container, a pipe line connecting the first and second containers and communicating the hollow portions thereof, and PVDF, aluminum nitride, or zinc oxide stored in the second container. The thin film sensor is composed of a fluid that is hermetically or liquid-tightly sealed in the first and second containers and the conduit, and pressure acting on the first container is transmitted through the fluid. Thin film sensor Configured to be detected acts.
According to a fourth aspect of the present invention, in the sensor according to any one of the first to third aspects, the fluid is a liquid made of silicon oil or mineral oil. In the sensor according to any one of the first to third aspects, the fluid is configured such that the fluid is a gas composed of air or an inert gas.
A sixth aspect of the invention receives a change in pressure detected by the body motion detection sensor according to any one of the first to fifth aspects, and generates a respiratory synchronization signal synchronized with respiration. The invention according to claim 7 is the apparatus according to claim 6, wherein a transmitter is provided in the body motion detection sensor, and the signal generation for breath synchronization is generated. Each apparatus is provided with a receiver corresponding to the transmitter, and the pressure change signal is transmitted and received by Bluetooth communication or near infrared communication.

  As described above, according to the present invention, the body motion detection sensor includes a flexible hollow container, a thin film sensor made of PVDF, aluminum nitride, or zinc oxide stored in the container, and an airtight container. Alternatively, it is formed so as to form a flat sheet from the fluid-tightly sealed fluid, and the pressure acting on the container is detected by acting on the thin film sensor via the fluid. Therefore, the pressure can be reliably detected through the fluid, and the breathing motion can be detected without requiring skill. The thin film sensor is not subjected to direct force, but pressure is applied through the fluid, so that the thin film sensor does not deteriorate at an early stage, and the signal line connected to the thin film sensor is also directly loaded. Therefore, the signal line is not disconnected and high durability is obtained. In addition, the body motion detection sensor is provided on the bed on which the patient lies, and is configured as a sensor that is inserted into the contact portion of the back surface of the patient and the table and detects a change in pressure accompanying the breathing operation. The sensor does not hit the tomography device, nor does it interfere with radiotherapy. Furthermore, since a thin film sensor made of PVDF, aluminum nitride, or zinc oxide hardly absorbs X-rays, there is almost no risk of being reflected in a tomographic image. According to the present invention, the body motion detection container is inserted into the contact portion between the patient's back and the table so that the pressure receiving area is larger than the area of the thin film sensor. It becomes possible to detect changes reliably. According to the present invention, the body motion detection sensor is composed of the hollow first container, the hollow second container, the thin film sensor, and the fluid sealed in the container. If the first container is placed on the back of the patient, the first container does not absorb X-rays, so that the sensor does not appear in the tomographic image, and a clear tomographic image can be obtained. In addition, since the thin film sensor is stored in a second container that is a container different from the first container that directly receives pressure, the thin film sensor does not bend or deteriorate. Furthermore, there is no possibility that the signal line connected to the thin film sensor is disconnected from the thin film sensor. That is, the durability is very high. Furthermore, according to the present invention, since the fluid sealed in such a container is also configured to be a gas composed of air or an inert gas, even if the container is broken, liquid leakage, etc. Thus, the safety of expensive medical equipment can be ensured. In addition, according to the invention relating to the respiratory synchronization signal generating device that receives the signal from the body motion detection sensor by Bluetooth communication or near infrared communication and generates a respiratory synchronization signal, the sensor and the respiratory synchronization signal generation Since the apparatus does not cause a malfunction of the medical device and the signal line does not get in the way, it is possible to safely install the respiratory synchronization signal generation apparatus.

1 is a perspective view schematically showing a respiratory synchronization signal generation device and a CT scanning device according to an embodiment of the present invention. It is a perspective view showing typically a body movement detection sensor concerning an embodiment of the invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which illustrates typically the connection part of the thin film sensor and flat cable of the body movement detection sensor which concerns on embodiment of this invention, The (a) shows typically the flexible IC chip which is a chip | tip for a connection. It is a perspective view, The (a) is sectional drawing which shows a mode that a thin film sensor and a flat cable are connected by the flexible IC chip. It is a perspective view which shows typically the body movement detection sensor which concerns on other embodiment of this invention.

The respiratory synchronization signal generation apparatus according to the present embodiment will be described using a CT scan apparatus provided with the respiratory synchronization signal generation apparatus as an example.
As shown in FIG. 1, the CT scanning apparatus 1 is roughly composed of a gantry 2 that scans a human body, a bed 3 on which a patient lies, and the like, in the same manner as a conventionally known CT scanning apparatus. The gantry 2 has a through hole having a predetermined inner diameter into which a human body is inserted at the center thereof. That is, the opening 5 is provided. Although not shown in FIG. 1, the gantry 2 includes an X-ray source that emits X-rays and a detector array that includes a number of sensors that detect X-rays transmitted through the human body. 5 are provided at positions facing each other. Such an X-ray source and the detector array can be rotated in the circumferential direction around the opening 5 while adopting positions facing each other with the opening 5 interposed therebetween. The gantry 2 is provided with a computer that controls the gantry 2 and the bed 3 and processes data.

  The bed 3 includes a pedestal 7 installed on the floor and a table 8 having a substantially rectangular plate shape provided on the pedestal 7. Although not shown in FIG. 1, the table 8 can be slid in the longitudinal direction by a table driving mechanism provided inside the pedestal 7. Such a bed 3 is installed adjacent to the gantry 2, and when the table driving mechanism is driven, the table 8 is inserted into the opening 5 or retracted.

  The body motion detection sensor 11 according to the present embodiment is provided on the upper surface of the table 8. The body motion detection sensor 11 is a sensor in which a pressure receiving portion that receives pressure is formed in a sheet shape, as will be described in detail later, and when the patient lies on the upper surface of the table 8, the back surface of the patient is The body movement caused by the movement of breathing can be detected as a change in voltage in such a manner that the pressure-receiving unit hits. A flat cable 12 is connected to the body motion detection sensor 11, and a transmitter 14 is connected to the tip of the flat cable 12. The transmitter 14 is fixed to the end surface of the long side of the table 8, and the flat cable 12 is sufficiently short. Therefore, the flat cable 12 and the transmitter 14 may interfere with tomographic image capturing or disturb the patient. There is no.

  A respiratory synchronization signal generator 16 is installed in the vicinity of the gantry 2, and the respiratory synchronization signal generator 16 and the gantry 2 are connected by a predetermined signal cable 18. The respiratory synchronization signal generation device 16 includes an open collector terminal, a TTL level line driver output terminal, a START / STOP output terminal, and an RS422 connection terminal, so that the signal cable 18 corresponds to the input terminal 19 of the gantry 2. Any type of cable can be selected. The respiratory synchronization signal generation device 16 is provided with a receiver or a receiver so that a signal transmitted from the transmitter 14 can be received. Note that the communication between the transmitter 14 and the receiver is performed by Bluetooth communication or near-infrared communication that does not cause malfunction of the device due to electromagnetic wave leakage. Therefore, the tomographic image apparatus 1 and medical devices installed in the vicinity are free from malfunction.

  As shown in FIG. 2, the body motion detection sensor 11 according to the present embodiment includes a hollow first container 21 having a sheet shape with a large upper surface area, and a hollow second container having a predetermined size. The container 22 and the thin film sensor 23 stored in the second container 22 are roughly configured. Since the first container 21 is a pressure receiving portion that is inserted between the patient's back surface and the table and receives the pressure on the patient's back surface, the first container 21 is formed of a flexible material such as polyvinyl chloride or polypropylene. The second container 22 is a container that protects the thin film sensor 23, and therefore does not have to be particularly flexible. In the present embodiment, the second container 22 is formed from an acrylic resin. The first and second containers 21 and 22 are connected in a gas-tight or liquid-tight manner by a connecting pipe 25 made of a flexible material, and the respective hollow portions communicate with each other. The thin film sensor 23 is a thin film piezoelectric element having a predetermined size made of PVDF (polyvinylidene fluoride), aluminum nitride, or zinc oxide. In the present embodiment, the thin film sensor 23 is made of aluminum nitride. The flat cable 12 is connected to the thin film sensor 23 via a predetermined connection chip as described below, and the transmitter 14 is connected to the flat cable 12 as described above. Silicon oil 27 is sealed in the body motion detection sensor 11, that is, the first and second containers 21 and 22 and the connecting pipe 25, and the entire thin film sensor 23 is immersed in the silicon oil 27. ing.

  The thin film sensor 23 made of an aluminum nitride piezoelectric element and the flat cable 12 are connected by a predetermined connecting chip, that is, a flexible IC chip 30. As shown in FIG. 3A, the flexible IC chip 30 is a flat chip having a notch 31 and first and second conductive wires 33 and 34 made of a copper thin film are notched. The first small piece 35 and the second small piece 36 of the chip divided by 31 are provided so as to be parallel to each other. The first conducting wire 33 is provided on the front surface of the chip, and the second conducting wire 34 is provided on the back surface of the chip. A method of connecting the thin film sensor 23 to the flat cable 12 using such a flexible IC chip 30 will be described. The thin film sensor 23 is inserted into the cut 31 by bending the flexible IC chip 30 with the first small piece 35 downward and the second small piece 36 upward. Then, as shown in FIG. 3A, the thin film sensor 23 can be sandwiched between the first and second small pieces 35 and 36 of the flexible IC chip 30. The thin film sensor 23 has a structure in which a substrate 38 made of polyimide resin and an aluminum nitride crystal layer 39 deposited thereon are covered on the upper and lower surfaces by first and second metal films 41 and 42 made of aluminum or the like. Presented. The anisotropic conductive adhesives 44 and 44 are applied to the first and second metal films 41 and 42 of the thin film sensor 23, and the first and second small pieces 35 and 36 of the flexible IC chip 30 are pressed. Glue. Then, the first metal film 41 and the first conductive wire 33, and the second metal film 42 and the second conductive wire 34 are electrically connected. A predetermined connector 47 is connected to the end 46 of the flexible IC chip 30, and the flat cable 12 is connected via the connector 47. The thin film sensor 23 and the flat cable 12 are connected.

  The operation of the CT scan apparatus 1 including the respiratory synchronization signal generation apparatus according to the present embodiment will be described. As shown in FIG. 1, the patient K is supine on the table 8 of the bed 3. At this time, the position of the pressure receiving portion of the body motion detection sensor 11, that is, the first container 21 is adjusted so that the pressure receiving portion hits a portion where the patient's back and the table 8 are in contact with each other, for example, in the vicinity of the shoulder rib or the hip. Insert into. Patient K moves slightly due to breathing and heart movement. The pressure receiving portion of the body motion detection sensor 11 receives a change in pressure due to body motion. Then, the change in pressure applied via the silicon oil 27 is detected as a change in voltage by the thin film sensor 23. Since the area of the pressure receiving part is sufficiently large, it can receive the pressure of the back efficiently, and since the pressure acts uniformly on the entire surface of the thin film sensor 23 by the silicon oil 27, the change in pressure can be detected with high accuracy. . The detected voltage change is transmitted to the respiratory synchronization signal generation device 16 by the transmitter 14. The respiratory synchronization signal generator 16 processes a waveform of the input voltage to generate a pulse signal synchronized with respiration, that is, a synchronization signal. The generated synchronization signal is input to the gantry 2. By the way, the voltage waveform includes different frequency components due to breathing motion and heartbeat, and further includes noise. Accordingly, a known analysis method such as Fourier transform or wavelet transform is applied to extract a frequency component corresponding to the breathing motion. Then, the timing of breathing can be obtained. Since the input power waveform contains many frequency components that change in a short time, an analysis method using wavelet transform is particularly effective. As an analysis method, for example, the Japan Society of Mechanical Engineers [No. 01-5] Dissertation of Symposium on Welfare Engineering CD-ROM [2001.8.7, Tokyo] "Study on unrestrained invasive measurement of respiratory and heart rate during sleep using W301 PVDF sensor (2nd report: Wavelet transform The method described in “Detection of respiratory heartbeat used)” can be applied.

  The table 8 is driven to insert the patient K into the opening 5 so that the site where a tomographic image is to be taken is positioned at the center of the opening 5. In synchronism with the synchronizing signal input to the gantry 2, the X-rays are exposed to take a tomographic image. At this time, the pressure receiving portion inserted into the contact portion between the back surface of the patient K and the table, that is, the first container 21 of the body motion detection sensor 11 and the silicon oil 27 do not absorb X-rays. These are not reflected. Subsequently, the table 8 is driven to slightly insert the patient K, and a tomographic image is taken in synchronization with the synchronization signal. Thereafter, a plurality of tomographic images are taken in the same manner.

  FIG. 4 shows a body motion detection sensor 11 ′ according to the second embodiment. Elements similar to those of the body motion detection sensor 11 according to the above-described embodiment are given the same reference numerals and will not be described in detail. As shown in FIG. 4, in the body motion detection sensor 11 ′ according to the second embodiment, the thin film sensor 23 is stored in the first container 21 ′, and the second container is provided. Not. That is, the thin film sensor 23 is stored in a predetermined portion of the first container 21 ′ that is a pressure receiving portion. If it does in this way, it will become possible to manufacture body motion detection sensor 11 'more cheaply. In addition, if the predetermined reinforcement member is provided about the part in which the thin film sensor 23 of the first container 21 ′ is stored, the thin film sensor 23 can be appropriately protected.

  The tomographic image apparatus according to the present embodiment can be variously modified. For example, the body motion detection sensor 11 and the respiratory synchronization signal generation device 16 are described as being wirelessly communicated by a transceiver, but may be directly connected by a predetermined signal cable. However, such a signal cable needs to be wired on the backside or edge of the table of the bed so as not to interfere with tomographic image capturing. In addition, the first and second containers 21 and 22 of the body motion detection sensor 11 are described as being filled with silicon oil, but the same applies to other liquids such as mineral oil. Can do. Furthermore, instead of such a liquid such as silicon oil, an inert gas such as carbon dioxide or nitrogen gas, or a gas such as air may be enclosed. Then, even if the first and second containers 21 and 22 are damaged, a liquid leakage accident does not occur.

DESCRIPTION OF SYMBOLS 1 CT scan apparatus 2 Gantry 3 Bed 5 Opening part 7 Base 8 Table 11 Body motion detection sensor 12 Flat cable 14 Transmitter 16 Breathing synchronization signal generator 21 First container 22 Second container 23 Thin film sensor 25 Connecting pipe 27 silicon oil

Claims (7)

In a medical device such as a CT scan device, a PET device, a radiation treatment simulation device, a radiation treatment device, etc., a pressure that is provided on a bed on which the patient lies and is inserted into a contact portion between the patient's back and the table and is associated with a breathing operation. A sensor for detecting a change in
The sensor includes a flexible hollow container, a thin film sensor made of PVDF, aluminum nitride, or zinc oxide housed in the container, and a fluid hermetically or liquid-tightly sealed in the container And formed so as to present a flat sheet as a whole,
A body motion detection sensor, wherein pressure acting on the container is detected by acting on the thin film sensor via the fluid.   2. The body motion detection according to claim 1, wherein the container has an area of a pressure receiving portion inserted into a contact portion of the back surface of the patient and the table, which is larger than an area of the thin film sensor. Sensor. In a medical device such as a CT scan device, a PET device, a radiation treatment simulation device, a radiation treatment device, etc., a pressure that is provided on a bed on which the patient lies and is inserted into a contact portion between the patient's back and the table and is associated with a breathing operation. A sensor for detecting a change in
The sensor is connected to the hollow first container, the hollow second container, and the first and second containers, which are flexible and have a flat sheet shape as a whole, and are respectively hollow. A pipe line that communicates with each other, a thin film sensor made of PVDF, aluminum nitride, or zinc oxide stored in the second container, and an airtight or liquid-tight structure in the first and second containers and the pipe line And the fluid enclosed in the
The body motion detection sensor, wherein the pressure acting on the first container acts on the thin film sensor via the fluid and is detected.   The sensor according to claim 1, wherein the fluid is a liquid made of silicon oil or mineral oil.   The sensor according to any one of claims 1 to 3, wherein the fluid is a gas composed of air or an inert gas.   A respiratory synchronization signal that receives a change in pressure detected by the body motion detection sensor according to any one of claims 1 to 5 and generates a respiratory synchronization signal synchronized with respiration. Generator.   The apparatus according to claim 6, wherein the body motion detection sensor is provided with a transmitter, the respiratory synchronization signal generation device is provided with a receiver corresponding to the transmitter, and the pressure change signal is A respiratory synchronization signal generation apparatus, wherein transmission / reception is performed by Bluetooth communication or near-infrared communication.

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