WO2016084567A1 - Appareil tdm à rayons x et son procédé de commande - Google Patents

Appareil tdm à rayons x et son procédé de commande Download PDF

Info

Publication number
WO2016084567A1
WO2016084567A1 PCT/JP2015/081134 JP2015081134W WO2016084567A1 WO 2016084567 A1 WO2016084567 A1 WO 2016084567A1 JP 2015081134 W JP2015081134 W JP 2015081134W WO 2016084567 A1 WO2016084567 A1 WO 2016084567A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
encoder
unit
ray
rotation
Prior art date
Application number
PCT/JP2015/081134
Other languages
English (en)
Japanese (ja)
Inventor
涼介 土田
Original Assignee
株式会社日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Priority to JP2016561473A priority Critical patent/JP6577487B2/ja
Publication of WO2016084567A1 publication Critical patent/WO2016084567A1/fr

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]

Definitions

  • the present invention relates to an X-ray CT apparatus, and more particularly to a technique for correcting an encoder signal generated in synchronization with rotation of a rotating unit.
  • X-ray CT Computer Tomography
  • X-ray CT equipment is an intensity of transmitted X-rays by irradiating X-rays from around a subject carried in an opening of a rotating part arranged with an X-ray source and an X-ray detector facing each other.
  • an encoder tape provided with slits at equal intervals is attached around the rotating part, and the position of the slit is read by a sensor provided in the stationary part, thereby synchronizing with the rotation of the rotating part.
  • a pulse hereinafter referred to as an encoder signal
  • the encoder signal is used for communication control between the rotating unit and the stationary unit and generation of a transmission timing control signal (hereinafter referred to as a view trigger signal) of transmitted X-ray data.
  • Patent Document 1 a method of correcting a missing encoder signal has been devised.
  • the period is calculated from the encoder signal input immediately before, the input timing of the next encoder signal is predicted, and the missing encoder signal is corrected by generating a dummy signal.
  • Patent Document 1 correction can be performed only when the period of the encoder signal is constant, that is, when the rotating part is rotating at a constant speed, and the period of the encoder signal is changed, that is, at the time of acceleration / deceleration of the rotating part. No consideration was given to the correction of the encoder signal.
  • An object of the present invention is to solve the above problems and provide an X-ray CT apparatus capable of correcting a missing encoder signal even during acceleration / deceleration of a rotating unit.
  • an X-ray source and an X-ray detector arranged to face the X-ray source and detecting an X-ray detector that transmits a transmitted X-ray through the subject
  • An encoder signal generation unit that generates an encoder signal that is synchronized with the rotation of the encoder
  • a control unit that outputs a control signal for controlling the rotation unit based on a correction signal that is input with the encoder signal and corrects the encoder signal.
  • the X-ray CT apparatus is configured to calculate a rotation speed change of the rotation unit from the input encoder signal, predict a signal change timing of the next encoder signal, and generate a correction signal at the predicted signal change timing.
  • an X-ray CT apparatus capable of correcting missing encoder signals even during rotation acceleration / deceleration of the rotating unit.
  • FIG. 4 is a time chart for explaining an encoder signal correction process according to the first embodiment. Flowchart for explaining an encoder signal correction process according to the first embodiment. The flowchart figure for demonstrating the detail of the prediction process based on Example 1. FIG. The flowchart figure for demonstrating the detail of the prediction process based on Example 2. FIG. The figure for demonstrating the control system based on Example 3. The flowchart figure for demonstrating the detail of the prediction process based on Example 3. FIG. The flowchart figure for demonstrating the detail of the prediction process based on Example 4. FIG.
  • the X-ray CT apparatus includes an X-ray source and a rotating unit on which an X-ray detector that is disposed opposite to the X-ray source and detects a transmitted X-ray dose that passes through a subject is mounted; and the rotating unit
  • An encoder signal generation unit that generates an encoder signal synchronized with the rotation of the encoder, and a control unit that outputs a control signal that controls the rotation unit based on a correction signal that is input with the encoder signal and corrects the encoder signal.
  • the controller calculates a rotation speed change of the rotating unit from the input encoder signal, predicts a signal change timing of the next encoder signal, and generates the correction signal at the predicted signal change timing It is characterized by.
  • control unit includes an encoder correction unit that receives the encoder signal and generates the correction signal.
  • the encoder correction unit rotates the rotation unit from the encoder signal that is continuously input until immediately before.
  • the correction signal is generated by calculating a speed change rate and predicting the signal change timing.
  • the rotational speed change rate is calculated at the time of rotational acceleration and / or deceleration of the rotating part.
  • the encoder correction unit predicts the signal change timing in consideration of an error amount between the past signal change timing and actual measurement timing recorded for each rotation angle position of the rotation unit.
  • the encoder correction unit further includes an environmental information sensor for measuring environmental information, and the encoder correction unit takes into account an error amount between the past predicted signal change timing and actual measurement timing recorded for each measurement value of the environmental information.
  • the signal change timing is predicted.
  • the encoder correction unit takes the signal change timing into account by adding an error amount between the past predicted signal change timing and the actual measurement timing recorded for each control amount of the control signal for controlling the rotation unit. It is characterized by predicting.
  • control unit uses the correction signal instead of the generated change in the next encoder signal when a change in the next encoder signal occurs at a timing other than the predicted signal change timing. To do.
  • control unit calculates a rotation speed change rate of the rotary unit including the predicted signal change timing, The signal change timing of the encoder signal is predicted.
  • an X-ray source and an X-ray detector that detects the transmitted X-ray dose that is disposed opposite to the X-ray source and transmits the subject are mounted.
  • a step of rotating the rotation unit, a step of generating an encoder signal synchronized with the rotation of the rotation unit, a change in rotation speed of the rotation unit from the input encoder signal, and a signal change timing of the next encoder signal And predicting, generating a correction signal at the predicted signal change timing, and correcting the encoder signal based on the correction signal.
  • an X-ray source and an X-ray detector arranged to face the X-ray source and detecting an X-ray detector that detects a transmitted X-ray dose that passes through the subject, and an encoder signal synchronized with the rotation of the rotating unit are provided.
  • An encoder signal generation unit for generating, and a control unit for outputting a control signal for controlling the rotation unit based on a correction signal to which the encoder signal is input and the encoder signal is corrected, and the control unit receives the input encoder signal 2 is an example of an X-ray CT apparatus configured to calculate a rotation speed change of a rotation unit from the predicted value, predict a signal change timing of the next encoder signal, and generate a correction signal at the predicted signal change timing.
  • the X-ray CT apparatus 1 includes a scanner 2, a bed 3, and a console 4.
  • the scanner 2 includes a stationary part 201, a rotating part 202, and a slip ring 203.
  • the stationary unit 201 includes a scanner control device 210 and a rotation sensor 211 that functions as an encoder signal generation unit.
  • the scanner control device 210 is controlled by the system control device 403 provided in the console 4, and controls the entire scanner 2. Specifically, as shown in FIG. 2, a main control unit A1 that controls the entire scanner 2, a stationary unit communication control unit A2 that controls communication of the stationary unit 201, and a stationary unit that controls the view trigger signal of the stationary unit 201.
  • the view trigger signal control unit A3 and the encoder correction unit A4 that corrects the encoder signal input from the rotation sensor 211 are included.
  • the rotation sensor 211 detects the position of the slit of the encoder tape 224, which will be described later, provided in the rotation unit 202, and outputs a signal (pulse) corresponding to the detection result to the scanner control device 210 as the encoder signal. To do.
  • the rotating unit 202 includes an X-ray tube 220 that is an X-ray source, a high-pressure generator 221, a rotating unit controller 222, an X-ray detector 223, and an encoder tape 224 for generating an encoder signal. Rotate around the subject.
  • the X-ray tube 220 is a device that continuously or intermittently irradiates a subject placed on the bed 3 with X-rays.
  • the high voltage generator 221 applies or supplies a tube voltage and an X-ray tube current to the X-ray tube in accordance with the X-ray conditions determined by the system controller 403 provided in the console 4.
  • the rotation unit control device 222 controls the rotation unit 202 based on a control signal from the scanner control device 210 controlled by the system control device 403 provided in the console 4. Specifically, as shown in FIG. 2, the rotation unit communication control unit B1 that controls communication of the rotation unit 202, the X-ray tube control unit B2 that controls the X-ray tube 220, and the view trigger signal of the rotation unit 202 are controlled. A rotating part view trigger signal control part B3.
  • the scanner control device 210, the rotation unit control device 222, and the system control device 403 may be collectively referred to as a control unit.
  • the scanner control device 210 and the rotation unit control device 222 can be realized by executing a CPU or FPGA program.
  • the system control device 403 is also a computer CPU or FPGA.
  • the scanner control device 210 and the system control device 403 can be realized by a single CPU or FPGA.
  • the X-ray detector 223 is a device that collects the spatial distribution of transmitted X-rays as digital data by detecting X-rays that are placed opposite to the X-ray tube 220 and transmitted through the subject, and detects a large number of X-rays.
  • the elements are arranged in the rotation direction of the rotation unit 202, or are arranged in two dimensions in the rotation direction of the rotation unit 202 and the rotation axis direction.
  • the encoder tape 224 is composed of a sheet metal 301 attached to the outer periphery of the rotating unit 202.
  • the sheet metal 301 is provided with slits 302 at equal intervals.
  • the number of slits 302 is determined according to the number of views of the X-ray CT apparatus 1 and the number of rotations of the rotation unit 202, and is 2880, for example.
  • the slip ring 203 transmits electric power and a control signal between the stationary part 201 and the rotating part 202.
  • the bed 3 includes a top plate on which a subject is placed, a bed control device, a vertical movement device, and a top drive device.
  • the bed control device controls the vertical movement device so that the height of the bed 3 is appropriate.
  • the top plate driving device is controlled to move the top plate back and forth in the body axis direction, or to move in the direction perpendicular to the body axis and parallel to the top plate (left and right direction).
  • the subject is carried in and out of the X-ray irradiation space of the scanner 2 by moving the top plate back and forth in the body axis direction.
  • the console 4 includes a display device 401, an input device 402, a system control device 403, an image processing device 404 as an image processing unit, and a storage device 405.
  • the display device 401 is a device that displays the CT image created by the image processing device 404, and is specifically a CRT (Cathode-Ray® Tube), an LCD (liquid crystal display), or the like.
  • the input device 402 is a device for inputting a subject's name, examination date and time, imaging conditions, and the like, specifically a keyboard or a pointing device.
  • the system control device 403 is a device that controls these devices and the scanner control device 210, the rotating unit control device 222, and the bed control device that is not shown.
  • the image processing device 404 is an image processing unit that performs CT processing on the measurement data sent from the X-ray detector 223 to perform CT image reconstruction.
  • the storage device 405 is a device that records data collected by the X-ray detector 223 and image data of a CT image created by the image processing device 404, and is specifically an HDD (Hard Disk Drive) or the like.
  • HDD Hard Disk Drive
  • the control system of the scanner 2 includes a scanner control device 210 provided in the stationary unit 201 and a rotation unit control device 222 provided in the rotation unit 202. Control signals, data, and the like are transmitted between the scanner control device 210 and the rotating unit control device 222.
  • the imaging position condition, the X-ray condition, and the like input to the system control apparatus 403 are transmitted to the main control unit A1 of the scanner control apparatus 210.
  • the main control unit A1 controls the position of the bed 3 and the rotation of the rotating unit 202 according to the imaging position condition input from the system control device 403. That is, the main control unit A1 transmits the X-ray condition input from the system control device 403 to the X-ray tube via the stationary unit communication control unit A2, the slip ring 203, and the rotation unit communication control unit B1 of the rotation unit control device 222. Transmit to control unit B2.
  • the X-ray tube control unit B2 controls the high-voltage generator 221 according to the X-ray conditions set by the main control unit A1, and applies and supplies predetermined X-ray tube voltage and X-ray tube current to the X-ray tube 220. .
  • the rotation sensor 211 is provided in the stationary part 201, detects the slit 302 of the encoder tape 224 interlocked with the rotation of the rotating part 202, and generates a pulse signal (referred to as an encoder signal) corresponding to the rotational speed of the rotating part 202, Send to encoder correction unit A4.
  • the encoder correction unit A4 calculates the rotation speed change rate of the rotation unit 202 from the encoder signal continuously input from the rotation sensor 211, and uses the calculated rotation speed change rate to signal change timing of the next encoder signal. And a dummy encoder signal (referred to as a correction signal) is generated at the predicted timing and sent to the main control unit A1 and the stationary unit view trigger signal control unit A3.
  • the X-ray CT apparatus includes an encoder correction unit that receives an encoder signal and generates a correction signal.
  • the encoder correction unit rotates the rotation unit from the encoder signal that has been continuously input until immediately before.
  • a configuration is provided in which a correction signal is generated by calculating a speed change rate and predicting a signal change timing.
  • the main control unit A1 transmits the correction signal to the rotation unit communication control unit B1 via the stationary unit communication control unit A2 and the slip ring 203.
  • the stationary unit communication control unit A2 and the rotation unit communication control unit B1 perform communication control based on the input correction signal.
  • the stationary part view trigger signal control unit A3 generates a view trigger signal based on the correction signal, and passes through the stationary part communication control unit A2, the slip ring 203, the rotation unit communication control unit B1, and the rotation unit view trigger signal control unit B3. Then, the view trigger signal is transmitted to the X-ray detector 223.
  • the X-ray detector 223 integrates and collects transmitted X-ray data in synchronization with the input view trigger signal, and transmits the data to the image processing apparatus 404 that is an image processing unit.
  • the image processing device 404 generates a subject fluoroscopic image, a tomographic image, and the like based on the acquired transmission X-ray data, and outputs them to the display device 401 and the storage device 405.
  • FIG. 4 is a diagram showing an encoder signal when the rotating unit 202 is accelerating.
  • FIG. 4 shows an encoder signal 303 in a normal state
  • FIG. 4 shows an encoder signal 304 at the time of contamination
  • FIG. 4 shows a correction signal 305 which is an encoder signal at the time of correction.
  • the normal encoder signal 303 is a signal in which, for example, the position of the slit 302 of the encoder tape 224 is “1”, and the other positions are “0”.
  • the encoder signal at the time of foreign matter contamination as shown in FIG. 4B is corrected to the correction signal as shown in FIG. 4C by the encoder correction unit A4 of the scanner controller 210.
  • the encoder correction unit A4 of the scanner controller 210 is corrected at the timing of the lower limit value 306 or the upper limit value 307 of the expected signal change timing to obtain a correction signal.
  • FIG. 5 and FIG. 6 are flowcharts showing the correction procedure of the encoder signal in the first embodiment.
  • the rotation speed of the rotation unit 202 is set by the system control device 403 and transmitted to the scanner control device 210.
  • the scanner control device 210 controls to drive the rotation unit 202 and start rotation according to the set rotation speed.
  • the rotation sensor 211 detects the slit 302 of the encoder tape 224 and outputs it as an encoder signal to the encoder correction unit A4 of the scanner control device 210.
  • the encoder correction unit A4 of the scanner control device 210 that has received the encoder signal from the rotation sensor 211 outputs a correction signal based on the received encoder signal.
  • Encoder correction unit A4 starts elapsed measuring time T n from the time of the inversion detection starts a timer upon detecting inverted such 0-0 from 1,1 of the input encoder signal encoder signal (S100). Thereafter, an encoder signal abnormality determination is performed based on T n (S110).
  • the conditions for determining whether there is an abnormality are as follows.
  • Normal judgment condition (1) T n is within the expected timing range and encoder signal inversion is detected Abnormal judgment condition (1) T n is smaller than the expected timing lower limit value and encoder signal inversion is detected Abnormal judgment condition (2 ) T n is greater than the expected timing upper limit value and the inversion of the encoder signal has not been detected.
  • the correction signal is inverted in accordance with the inversion of the encoder signal (S120a). In this case, the inversion of the correction signal matches the inversion of the input encoder signal.
  • T n becomes the expected timing lower limit. Until T n reaches the lower limit of the expected timing, the correction signal is inverted.
  • the encoder correction unit when a change in the next encoder signal occurs other than the predicted signal change timing, replaces the change in the next generated encoder signal with the predicted signal change. A correction signal generated at timing is used.
  • the encoder correction unit A4 stops the timer and ends the measurement of T n (S130), and predicts the next signal change (inversion) timing based on T n (S140).
  • Correction processing transition number of the correction signal if there is less than the predetermined number of times to start the measurement of the continuous again T n correction processing, when a prescribed number of times the correction process is finished (S150). The specified number of times is determined by the number of slits provided in the encoder tape 224 and the number of scans.
  • next signal change timing prediction process the signal change timing is predicted according to the procedure shown in FIG.
  • correction processing is not performed, that is, when the encoder signal is normal, the rotation speed ⁇ n of the rotating unit 202 is set to the slit interval provided on the encoder tape 224 and the elapsed time T n from the detection of inversion of the encoder signal.
  • S142a When correction processing is performed, that is, when the encoder signal is abnormal, calculation is performed using the slit interval and the previous prediction timing time n-1 (S142b). This rotational speed is retained for use in calculating the next rotational speed change rate.
  • the rotational speed change rate is calculated from the difference between the previous rotational speed and the current rotational speed using the formula described in S143.
  • an average value of a predetermined number of rotation speed change rates calculated up to that point may be used.
  • the calculated predicted the next rotational speed omega n + 1 of the rotating part from the rotation speed variation rate a n (S144), based on the predicted rotational speed calculated by the formula described in S144, the next encoder signal inversion Timing is predicted (S145).
  • the predicted inversion timing has a certain range with margins before and after.
  • the margin is determined by the statistical variation in the rotation speed of the rotation unit 202. Further, the margin is not a fixed value and may be changed while the rotating unit 202 is rotating.
  • the X-ray CT apparatus generates an encoder signal synchronized with the rotation of the rotating unit 202 by the encoder tape 224 and the rotation sensor 211.
  • the scanner control device 210 monitors the encoder signal at the encoder correction unit A4, and corrects it with a correction signal if any is missing. That is, the encoder correction unit A4 calculates the rotation speed change rate of the rotation unit 202 based on the encoder signals that are continuously input until immediately before, and predicts the signal change timing of the next encoder signal. Further, the encoder correction unit A4 inverts the output correction signal at the predicted signal change timing, and this correction signal is used as the corrected encoder signal as the main control unit A1, the stationary unit view trigger signal control unit A3. Is output.
  • an encoder signal can be output at an appropriate timing as in the normal state even when an encoder signal is lost even when an abnormality such as mixing of foreign matter occurs in the encoder tape even during rotation acceleration / deceleration of the rotating part. That is, when a change in the next encoder signal occurs other than the predicted signal change timing, the rotation speed change rate of the rotating unit is calculated including the predicted signal change timing, and the signal change timing of the next encoder signal is further calculated. Prediction makes it possible to correct missing encoder signals even during rotation acceleration / deceleration of the rotating unit, and to provide more stable X-ray CT apparatus performance.
  • the prediction process is performed using the rotation speed change rate of the rotating unit
  • the prediction timing and the actual normal signal change for each rotation angle position of the rotating unit in addition to the rotation speed change rate, the prediction timing and the actual normal signal change for each rotation angle position of the rotating unit.
  • Prediction processing is performed using the difference (error amount) from the timing.
  • the encoder correction unit of the present embodiment predicts the signal change timing by taking into account the difference (error amount) between the past signal change timing and the actual measurement timing recorded for each rotation angle position of the rotation unit.
  • the configuration of the X-ray CT apparatus according to the second embodiment is the same as that described with reference to FIGS.
  • the prediction process of the second embodiment will be described with reference to the flowchart of FIG. As shown in the figure, when the prediction process is started, whether or not the correction process is executed is confirmed (S241). When correction processing is not performed, that is, when the encoder signal is normal, an error amount between the prediction timing and the actual signal change timing is calculated and recorded in association with the rotation angle position (S242a). When correction processing is performed, that is, when the encoder signal is abnormal, the error amount is set to 0 and recorded in association with the rotation angle position (S242b).
  • the amount of error to be recorded is not limited to the amount of error calculated this time, and an average value of the already recorded value and the amount of error calculated this time may be taken.
  • the encoder signal can be corrected with higher accuracy during acceleration / deceleration.
  • the prediction process is performed using the error amount for each rotation angle position in addition to the rotation speed change rate of the rotation section
  • the rotation speed of the rotation section is influenced in addition to the rotation angle position.
  • Prediction processing is performed using an error amount for each environmental information such as ambient temperature and humidity. That is, the third embodiment further includes an environmental information sensor that measures environmental information of the X-ray CT apparatus, and the encoder correction unit records the past predicted signal change timing and actual measurement timing recorded for each measurement value of the environmental information. This is an embodiment of a configuration for predicting signal change timing in consideration of the amount of error.
  • the configuration of the X-ray CT apparatus of the third embodiment is the same as that of the first and second embodiments except that an environmental information sensor 204 for acquiring environmental information is added to the scanner 2 as shown in FIG.
  • the environmental information sensor 204 is, for example, a thermometer or a hygrometer.
  • the environment information temp is first acquired by the environment sensor (S341). After that, whether or not the correction process is executed is confirmed (S342) . If the correction process is not performed, an error amount between the prediction timing and the actual signal change timing is calculated, and the error amount e temp associated with the environment information is updated (S343a ). When the correction process is performed, the error amount e temp associated with the environment information is recorded (held) (S343b).
  • the error amount e temp to be recorded is not limited to the error amount calculated this time, and may be an average value of the already recorded value and the error amount calculated this time.
  • the rotation speed of the rotation unit is calculated (S344), the rotation speed change rate is calculated (S345), and the next rotation speed of the rotation unit is predicted from the rotation speed change rate (S346).
  • the environment information temp ′ is acquired again by the environment sensor (S347), the error amount e temp ′ corresponding to the environment information temp ′ is read (S348), and the next signal change timing is predicted (S349).
  • the environment information may use a plurality of elements such as temperature and humidity. Further, if the environmental change is small, the monitoring frequency of the environmental sensor may be reduced. According to the present embodiment, since the surrounding environment information is taken into account, the encoder signal can be corrected in accordance with the environment information of the apparatus.
  • the prediction process is performed using the error amount for each rotation angle position and the error amount for each environment information in addition to the rotation speed change rate of the rotation unit. Prediction processing is performed using an error amount for each control amount. That is, the encoder correction unit according to the fourth embodiment is configured to predict the signal change timing in consideration of the error amount between the past prediction timing and the actual measurement timing recorded for each control amount of the control signal for controlling the rotation unit. It is.
  • the configuration of the X-ray CT apparatus of the fourth embodiment is the same as that of the first and second embodiments, but a control amount to the rotating unit 202 is sent from the main control unit A1 of the scanner control device 210 to the encoder correction unit A4. It has become.
  • the prediction process in the fourth embodiment will be described with reference to the flowchart of FIG.
  • the control amount u is acquired from the main control unit A1 (S441). Thereafter, whether or not the correction process is executed is confirmed (S442). If the correction process is not performed, an error amount between the prediction timing associated with the control amount u and the actual signal change timing is calculated and recorded (S443a). When the correction process is performed, an error amount associated with the control amount u is recorded (held) (S443b).
  • the amount of error to be recorded is not limited to the amount of error calculated this time, and an average value of the already recorded value and the amount of error calculated this time may be taken.
  • the prediction process is performed using the error amount for each control amount to the rotation unit, it is possible to correct the encoder signal with higher accuracy according to the control amount.
  • the X-ray CT system is a rotation-rotate method in which the X-ray tube and the X-ray detector rotate together while irradiating a wide fan beam that covers the entire subject, and other methods.
  • the present invention is applicable to any type of X-ray CT apparatus.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Engineering & Computer Science (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

L'objectif de l'invention est de fournir un appareil TDM à rayons X capable de corriger un signal de codeur manquant, même lors d'une accélération ou décélération d'une unité de rotation. L'appareil TDM à rayons X est pourvu de : une unité de rotation qui comprend un tube à rayons X et un détecteur de rayons X installé sur celui-ci et tourne autour d'un sujet; un capteur de rotation qui génère un signal de codeur synchronisé avec la rotation de l'unité de rotation; et un dispositif de commande de scanner qui reçoit une entrée du signal de codeur et délivre en sortie un signal de commande pour commander l'unité de rotation sur la base d'un signal de correction obtenu par correction du signal de codeur. Le dispositif de commande de scanner calcule un taux de changement de vitesse de rotation de l'unité de rotation du signal de codeur entré en continu jusqu'au moment immédiatement précédent, prédit la temporisation de changement de signal suivant du signal de codeur, et génère un signal de correction à la temporisation de changement de signal prédite.
PCT/JP2015/081134 2014-11-27 2015-11-05 Appareil tdm à rayons x et son procédé de commande WO2016084567A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016561473A JP6577487B2 (ja) 2014-11-27 2015-11-05 Ｘ線ｃｔ装置及びその制御方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-239689 2014-11-27
JP2014239689 2014-11-27

Publications (1)

Publication Number Publication Date
WO2016084567A1 true WO2016084567A1 (fr) 2016-06-02

Family

ID=56074138

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/081134 WO2016084567A1 (fr) 2014-11-27 2015-11-05 Appareil tdm à rayons x et son procédé de commande

Country Status (2)

Country Link
JP (1) JP6577487B2 (fr)
WO (1) WO2016084567A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106880374A (zh) * 2017-03-27 2017-06-23 东北大学 能谱ct成像方法及能谱ct成像系统
WO2018020946A1 (fr) * 2016-07-28 2018-02-01 株式会社日立製作所 Dispositif de ct à rayons x
CN112075946A (zh) * 2020-08-20 2020-12-15 浙江大学 一种ct机转速检测结构和方法
CN112472113A (zh) * 2020-11-25 2021-03-12 上海西门子医疗器械有限公司 Ct系统及控制其x射线管的位置的方法、装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004202201A (ja) * 2002-10-31 2004-07-22 Toshiba Corp 回転角度検出装置およびｘ線コンピュータ断層撮影装置
JP2012170736A (ja) * 2011-02-23 2012-09-10 Toshiba Corp Ｘ線コンピュータ断層撮影装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004202201A (ja) * 2002-10-31 2004-07-22 Toshiba Corp 回転角度検出装置およびｘ線コンピュータ断層撮影装置
JP2012170736A (ja) * 2011-02-23 2012-09-10 Toshiba Corp Ｘ線コンピュータ断層撮影装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018020946A1 (fr) * 2016-07-28 2018-02-01 株式会社日立製作所 Dispositif de ct à rayons x
CN106880374A (zh) * 2017-03-27 2017-06-23 东北大学 能谱ct成像方法及能谱ct成像系统
CN112075946A (zh) * 2020-08-20 2020-12-15 浙江大学 一种ct机转速检测结构和方法
CN112472113A (zh) * 2020-11-25 2021-03-12 上海西门子医疗器械有限公司 Ct系统及控制其x射线管的位置的方法、装置
US11896412B2 (en) 2020-11-25 2024-02-13 Siemens Healthcare Gmbh Computed tomography system and method and device controlling the position of the x-ray tube thereof
CN112472113B (zh) * 2020-11-25 2024-04-23 上海西门子医疗器械有限公司 Ct系统及控制其x射线管的位置的方法、装置

Also Published As

Publication number Publication date
JP6577487B2 (ja) 2019-09-18
JPWO2016084567A1 (ja) 2017-09-07

Similar Documents

Publication Publication Date Title
JP6577487B2 (ja) Ｘ線ｃｔ装置及びその制御方法
JP5808734B2 (ja) Ｘ線撮像装置
EP3554372B1 (fr) Système et procédé de surveillance d'un système de tomodensitométrie
CN106687045B (zh) 数据处理装置、x射线ct装置以及参考校正方法
JP6422646B2 (ja) Ｘ線コンピュータ断層撮影装置及び情報処理装置
CN106214169B (zh) 用于产生检查对象的x射线图像的方法和装置
JP2009022412A (ja) Ｘ線ｃｔ装置
JP5447526B2 (ja) 放射線撮影装置および画像の取得方法
US20160166228A1 (en) Rotation speed correction for ct scanner system
US9326740B2 (en) Radiographic system
JP4908957B2 (ja) Ｘ線ｃｔ装置
WO2018020946A1 (fr) Dispositif de ct à rayons x
JP2007121010A (ja) Ｘ線検査装置
JP4866567B2 (ja) 撮影装置および被検体移動装置
JP5627295B2 (ja) Ｘ線ｃｔ装置
JP5469952B2 (ja) Ｘ線ｃｔ装置
JP6831673B2 (ja) 放射線断層撮影装置およびプログラム
JP5995491B2 (ja) Ｘ線ｃｔ装置
JP2012161680A (ja) Ｘ線ｃｔ装置
JP2013215480A (ja) Ｘ線ｃｔ装置
JP7350527B2 (ja) Ｘ線ｃｔ装置
JP5634684B2 (ja) Ｘ線ｃｔ装置
JP5625258B2 (ja) Ｘ線画像装置
JP2022170113A (ja) 動態品質管理装置、動態品質管理プログラム及び動態品質管理方法
JP6359245B2 (ja) Ｘ線コンピュータ断層撮影装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15862962

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2016561473

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15862962

Country of ref document: EP

Kind code of ref document: A1