WO2019044983A1 - Dispositif tdm à rayons x et procédé de génération d'image - Google Patents

Dispositif tdm à rayons x et procédé de génération d'image Download PDF

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WO2019044983A1
WO2019044983A1 PCT/JP2018/032143 JP2018032143W WO2019044983A1 WO 2019044983 A1 WO2019044983 A1 WO 2019044983A1 JP 2018032143 W JP2018032143 W JP 2018032143W WO 2019044983 A1 WO2019044983 A1 WO 2019044983A1
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image
data
time
projection data
estimated
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PCT/JP2018/032143
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English (en)
Japanese (ja)
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俊裕 利府
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株式会社根本杏林堂
株式会社コノシュア
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Publication of WO2019044983A1 publication Critical patent/WO2019044983A1/fr

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    • 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]

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  • the present invention relates to an X-ray CT apparatus and an image generation method, and more particularly to provide an X-ray CT apparatus and an image generation method and the like which are excellent in time resolution and can reduce artifacts due to movement of an object. .
  • CT computed tomography
  • MRI Magnetic Resonance Imaging
  • PET Positron Emission Tomography
  • ultrasound diagnostic devices ultrasound diagnostic devices
  • angiography imaging devices etc.
  • a subject is irradiated with X-rays, and an X-ray that has passed through the body of the subject is detected by a detector to acquire raw data, which is subjected to predetermined preprocessing to be projected data Generate Then, the projection data is used to reconstruct an image, and a tomographic image of the region of interest of the subject is generated.
  • image reconstruction a method of reconstructing an image from scan data in the range of 360 ° and a method of reconstructing an image from scan data in the range of 180 ° + fan beam angle ( ⁇ ) are known. ing.
  • Patent Document 1 relates to a technique for imaging a moving object (for example, the heart in one example), and for example, as shown in FIG. 16, it is disclosed to obtain data on the amount of movement of the object by comparing two images. It is done. Specifically, using the comparison image 1330 of the objects 1311 and 1312 of the first image 1310 and the objects 1321 and 1322 of the second image 1320, the movement amount of the object can be known. According to claim 1 of the same document, an intermediate time between a first time corresponding to a first image and a second time corresponding to a second image based on data of the amount of movement of the object. It is described that the image is obtained by reconstruction.
  • Patent Document 1 Although the image is generated based on the data of the motion amount, the image is generated only by performing reconstruction. The document does not disclose or suggest the generation of a final image regardless of reconstruction.
  • an object of the present invention is to provide an X-ray CT apparatus, an image generation method, and the like which are excellent in time resolution and can reduce an artifact due to the movement of an object by a method different from that of Patent Document 1.
  • An X-ray CT apparatus is as follows: A gantry having an emitter for emitting X-rays and a detector for detecting the X-rays; An image data processing unit that performs an operation based on detection data from the detector; An X-ray CT apparatus comprising The image data processing unit Generating an image using data including the first projection data, the second projection data, and the third projection data; a1: processing of performing partial reconstruction using the first projection data to generate a first image of an object at time t (A); a2: Partial reconstruction is performed using second projection data which is opposite data of the first projection data, and the second object of the object at time t (C) after time t (A) Processing to generate an image, a3: Partial reconstruction is performed using the third projection data between the first projection data and the second projection data, and time t (A) between time t (A) and time t (C) A process of generating a third image in B); a4: processing of acquiring data of motion
  • the first projection data and the second projection data are "opposite data", which means that they are 180 ° opposite data.
  • the invention is applicable to both parallel beam and fan beam CT devices.
  • -"Image data processing unit has, for example, a CPU (one or more processors) that performs arithmetic processing, a memory, an interface, etc., and executes various functions by executing a computer program stored in the memory. It may be a computer that realizes -"Subject” basically refers to a human, but may be for imaging an animal. “Operator” includes a doctor, a medical worker (eg, radiologist, nurse), and the like.
  • a drug solution injector basically refers to a drug solution injector for injecting a drug solution such as a contrast agent (for example, an iodine-based agent).
  • the drug solution injector may be used by being disposed in the vicinity of the X-ray CT apparatus.
  • the drug solution injector in one form comprises the following components: -One or more piston drive mechanisms, -1 or more control units (control units), and -One or display etc.
  • One embodiment of the liquid injector may include an injection head and a console connected thereto.
  • the injection head may be provided with a piston drive mechanism
  • the console may be provided with a control unit and a display
  • both the injection head and the console may be provided with a control unit
  • displays may be provided on both the infusion head and the console.
  • an X-ray CT apparatus an image generation method, and the like which are excellent in time resolution and capable of reducing an artifact due to the movement of an object.
  • FIG. 6 is a diagram showing an image generated from each data set. It is a figure for demonstrating making an intermediate
  • An X-ray CT apparatus 1 (also referred to simply as “CT apparatus 1”) shown in FIG. 1 includes a gantry 100 and a control unit 150 connected thereto. Although not shown in FIG. 1, the CT apparatus 1 also includes a bed on which the subject is placed and moved. In the present embodiment, the gantry 100 itself may use a conventionally known one. The basic functions (control of operation of gantry, reconstruction of tomographic image layer, etc.) of the control unit 150 can also be implemented with a conventionally known configuration.
  • the gantry 100 is provided with an X-ray irradiator 101 that emits X-rays toward the subject S, and an X-ray detector 111 disposed opposite to the X-ray irradiator. These are held by the rotation mechanism 105, and configured to integrally rotate at the time of imaging (at the time of scanning).
  • the X-ray irradiator 101 has an X-ray tube (not shown), and generates a X-ray upon receiving a high voltage pulse generated from a high voltage generator (not shown).
  • the irradiated X-rays may have, for example, a conical or pyramidal beam shape.
  • the X-ray irradiation unit 101 is provided with a collimator having a slit of a predetermined width, whereby a fan angle of X-ray (a spread angle in the channel direction (details below)) Is to be prescribed.
  • the rotation mechanism 105 has a rotation frame 102 which is formed to a size surrounding the subject S and rotates around the subject S at the time of scanning.
  • the rotation mechanism 105 may be provided with a plurality of pairs of the X-ray irradiator 101 and the detector 111. However, in the present embodiment, only one pair is provided as an example.
  • the X-ray detector 111 is one in which a plurality of X-ray detection elements (not shown) are arranged along the channel direction (details described below).
  • the X-ray detection element outputs intensity data of X-rays transmitted through the subject S as an electric signal (raw data).
  • the X-ray detector 111 may have, for example, multiple rows of surface detectors arranged respectively in the slice direction and the channel direction.
  • the “slice direction” corresponds to the body axis direction of the subject S
  • the “channel direction” corresponds to the rotation direction of the X-ray irradiator 101.
  • the X-ray detector 111 is connected to a data acquisition unit 106 including a data acquisition circuit 104 called a DAS (data acquisition system).
  • the data acquisition circuit 104 periodically integrates an IV converter that converts the current signal of each channel of the X-ray detector 111 into a voltage, and this voltage signal in synchronization with the X-ray irradiation cycle.
  • an integrator Further, an amplifier for amplifying the output signal of the integrator, and an analog-digital converter for converting the output signal of the amplifier into a digital signal are provided.
  • the data acquisition unit 106 performs predetermined pre-processing on the signal from the detector and outputs it as “projection data”.
  • the preprocessing is not particularly limited, but may be, for example, logarithmic conversion processing, offset processing, sensitivity correction processing, beam hardening processing, or the like.
  • the control unit 150 includes, for example, a scanner controller 151, an input device 153, a display device 155, a storage device 157, an image data processing unit 160, and the like.
  • the control unit 150 is an example, and is configured by one computer, and specifically, a processing device such as a central processing unit (CPU) or a graphic processing unit (GPU), and a read only memory (ROM) And a storage device (not shown) such as a RAM (Random Access Memory) or an HDD (Hard Disc Drive).
  • the storage device stores a control program for executing the function of each unit.
  • a processing device such as a CPU executes each program stored in the storage device to execute each function. It is also possible to configure the control unit 150 with a plurality of computers.
  • the computer including the scanner controller 151 and the computer including the image data processing unit 160 may be configured separately.
  • the input device 153 for example, a device such as a keyboard or a mouse used for input from the operator is provided. Besides, in addition or as an alternative, a voice input device, a non-contact motion detection device or the like may be used. It is also possible to use a touch pad or a touch pen.
  • the display device 155 may be provided with one or more displays.
  • the storage device 157 may also be anything as long as it can store predetermined data (projection data, generated image data, etc.), and uses a hard disk drive (HDD) or a solid state drive (SSD) can do.
  • HDD hard disk drive
  • SSD solid state drive
  • the scanner controller 151 is a control unit for controlling the operation and the like of each part of the gantry 100 of the CT apparatus 1, and may be a conventionally known one. Although not limited, the scanner controller 151 may control operations of the X-ray irradiation unit 101, the detector 111, the rotation mechanism 105, a high voltage generation unit (not shown), and the like.
  • the image data processing unit 160 (i) generates a tomographic image based on the data output from the data acquisition unit 106 (function) and (ii) generates an estimated tomographic image according to the present embodiment. It has a part (function) that executes a function (details below). In addition to that, it also has a function of rendering the generated tomographic image, etc. However, since a conventionally known method can be used for this, detailed description will be omitted.
  • the above (i) may be performed by the reconstruction processing unit, and as a specific example, reconstruction is performed based on the projection data output from the data acquisition unit 106, Tomographic image data (two-dimensional data or three-dimensional volume data) is generated.
  • Tomographic image data two-dimensional data or three-dimensional volume data
  • any method such as Fourier transform method, convolution back projection method, successive approximation method, integral integration method, filter back projection method, etc. can be adopted.
  • the volume data may be generated by performing interpolation processing using a plurality of reconstructed tomographic image data.
  • the Feldkamp method is a reconstruction method in the case where projection rays intersect the reconstruction surface like a cone beam.
  • the cone beam reconstruction method is a reconstruction method which corrects projection data according to the angle of the ray with respect to the reconstruction surface as a method in which the error of the cone angle is suppressed more than the Feldkamp method.
  • the image data processing unit 160 also has the function of comparing two images to obtain data of motion information.
  • edge detection of an image may be performed to acquire information such as a movement amount and / or a deformation amount of a predetermined point, and a direction.
  • Various other methods can be adopted as a technique for acquiring motion vector information.
  • the image data processing unit 160 also has a function to deform and move the first image and / or the second image based on the data of the motion information acquired as described above. Specifically, the first image and / or the second image is generated so as to generate an intermediate image between the first image (time t (A)) and the second image (time t (C)) Has a function to move the Note that “deformed movement” means either performing deformation only, performing movement only, or performing both of them, and is necessarily limited to always performing both deformation and movement. It is not a thing.
  • the image data processing unit 160 also partially reconstructs the first image and / or the second image generated by the deformation movement and a part of the scan data in order to generate a final estimated tomographic image. It also has a function of superimposing an image obtained in detail (described in detail later) into one image.
  • the operation of the CT apparatus 1 of the present embodiment configured as described above will be described.
  • the CT apparatus 1 of this embodiment also has a function of general tomographic image generation known in the prior art, the description thereof is omitted, and the procedure of generating an estimated tomographic image which is the main feature of the present application.
  • the explanation will be focused on Although flowcharts are shown in FIG. 2 and FIG. 3, the method of the present invention is not necessarily limited to that order, and the order of one or more steps is changed without departing from the scope of the present invention. Or you may make it implement simultaneously.
  • step S1 An outline of a flow from imaging by the CT apparatus 1 to tomographic image generation is as shown in FIG. That is, first, in this example, the contrast agent is injected into the subject in step S1. Then, in step S2 at which a predetermined time has elapsed from the start of contrast agent injection, the CT apparatus 1 performs a scan. In step S3, predetermined preprocessing and the like are performed on the data obtained thereby to generate projection data, and then in step S4, a predetermined image generation process is performed based on the projection data.
  • data 120 in FIG. 5 (which may be regarded as sinogram data) is data including projection data A, projection data B, and projection data C in order from the rotation angle 0 degree side (upper end side in the figure). is there.
  • Step S11 Using the data 120, in step S11, partial reconstruction is first performed using the first projection data A to generate a first image Im (A) corresponding to this range.
  • FIG. 6 is a diagram for explaining the positional relationship and the like of the scan time and the image corresponding thereto.
  • the horizontal axis indicates time, and the vertical axis indicates the image position of the object.
  • the first projection data A is captured at time t (A)
  • the image Im (A) is displayed at the time t (A).
  • Step S12 Next, in step S12, partial reconstruction is performed using the second projection data C, and a second image Im (C) corresponding to this range is generated.
  • the second projection data C is data corresponding to the opposite beam whose angle is shifted by 180 ° with respect to the first projection data A.
  • the image Im (C) is displayed at the time t (C).
  • Step S13 Referring back to the flowchart of FIG. 3 again, in step S13, the third projection data B is used to generate an image Im (B) corresponding to this portion.
  • Step S14 Now, as described above, the position and shape of the object at time t (A) and the position of the object at time t (C) by reconstruction and imaging for each of the projection data A and C. You will know the shape. Therefore, based on these two images Im (A) and Im (C), it is possible to obtain data of motion information of the object.
  • Step S15 Thus, if data of motion information is obtained, for example, the image Im (A) at time t (A) is deformed and moved to an image at time t (B), as shown in FIG.
  • the estimated image Im (A) 'in (B) can be generated.
  • the estimated image Im (A) ′ can be realized, for example, by image processing in which the position is linearly moved, or the size and shape are linearly deformed, using data of motion information.
  • the data processing may be nonlinear data processing that is not necessarily linear in a strict sense, but linear.
  • an estimated tomographic image at time t (B) is generated.
  • the estimated image Im (C) ′ at time t (B) may be generated based on the image Im (B) at time t (C), and may be superimposed on the image Im (B).
  • Im (A) ′ modified from the image Im (A) and Im (C) ′ modified from the image Im (C) are prepared, and the following equation You may choose to do the superposition with: [(Im (A) ′ + Im (C) ′) / 2] + Im (B) According to such a method, even when the contrast agent concentration largely changes during scanning, the change can be reduced, which is preferable.
  • the estimated tomographic image finally obtained by the method of the present embodiment is generated by virtually preparing images of the same time (here, time t (B)) and superimposing them. Therefore, it is possible to obtain a good image with excellent temporal resolution and reduced motion artifacts with relatively simple data processing without requiring reconstruction processing. Moreover, it is preferable also in the point which can reduce the exposure dose of a test object compared with the case of a full scan.
  • time t (B) does not necessarily have to be exactly halfway between the first time t (A) and the second time t (C). It may be any time between the two times t (A) and t (C).
  • the estimated tomographic image generated in step S15 may be displayed on one or more display devices 155 of the CT apparatus 1, but is not necessarily limited thereto.
  • the data may be stored in the storage device 157 or a predetermined external storage means, and may be displayed on another device.
  • the computer that constitutes a part of the CT apparatus performs the image generation process according to an aspect of the present invention, but another computer may perform the image generation process.
  • the image generation processing program according to an aspect of the present invention may be installed on a predetermined computer so that the image generation processing can be performed.
  • the images Im (A) and Im (B) are generated using the data of the opposite beam.
  • the images Im (A) and Im (B) are two images that are essentially the same if there is no movement of the subject. As described above, movement and / or deformation occur between the image Im (A) and the image Im (B) when the subject moves. Information on movement and deformation can be obtained by comparing the two images. In the above embodiment, information on the movement and deformation is used, but if it is the images Im (A) and Im (B) from which such information can be obtained, the data is not necessarily limited to the opposite data, You may use the data of For example, assume a scan in which the tube is rotated several times.
  • projection data A during one rotation (see FIG. 5) and projection data A 'during the next rotation (data delayed by 360 ° with respect to the previous projection data A) And may be used.
  • the two images created from these data will also move and / or deform if there is movement of the subject. Then, information on movement and deformation can be obtained similarly to the above by comparing the two images.
  • the angle ⁇ is in the range of 10 ° to 120 ° as an example.
  • projection data B (see FIG. 5) is data of an angle (that is, 170 °) from 10 ° to 180 °. In the present invention, it is also possible to use projection data B in such a range.
  • projection data may be obtained from an imaging device, but the present invention is not necessarily limited to this.
  • the configuration may be such that projection data stored in a data storage device other than the imaging device is used.
  • at least two component images for example, a component image captured in a first time phase and a component image captured in a second time phase
  • the first time phase is (a + b) and the second time phase is (b + c)
  • the movement / deformation information may be obtained by comparison or subtraction processing.
  • MRI Magnetic resonance imaging
  • PET positron emission tomography
  • SPECT Single Photon Emission Computed Tomography
  • an image may be generated by the following method. That is, in this example, first, as shown in FIG. 8, it is assumed that there is scan data (including data A to C, A and C are opposite data) for 180 ° + ⁇ , and this is used . First, with respect to the region I (180 ° range), reconstruction is performed based on the data of A + B to generate a corresponding first image (see also Im (A + B) in FIG. 9).
  • motion information can be obtained based on them as in the above-described embodiment, and the intermediate time (time t (B And the above-described embodiment) can be generated.
  • Such a method that is, a method using data A and C shifted by an angle ⁇ can be implemented by a general CT apparatus, for example, by a conventionally known half reconstruction method, and is useful.
  • the data 220 of FIG. 10 is data including two scan data for 180 °, and includes a first data set 221 and a second data set 222.
  • the first data set 221 includes data of the area a and data of the area b, and each data is, for example, data for an angle of 90 °.
  • the second data set 222 is shifted by 90 ° with respect to the first data set 211, and is composed of the data of the area b and the data of the area c. These data are also data for an angle of 90 ° as an example.
  • the data in the area b is duplicate data in the first and second data sets 221 and 222.
  • t (A), t (B) and t (C) be the central times collected for the regions a, b and c. Data is collected in the order of the area a to the area c.
  • the pair of data sets 221 and 222 may be, for example, ones respectively generated by reconstruction processing on the CT apparatus side.
  • the present invention relates to an image data set having a plurality of data in the body axis direction. It can also be implemented and may be premised on the use of volume data.
  • the image processing apparatus (not shown) includes a CPU (one or more processors) for performing arithmetic processing and an image processing unit having a memory, an interface, etc., and a computer program stored in the memory. Implement various functions by executing.
  • the image processing apparatus may be provided as a stand-alone device or may be provided as part of another apparatus.
  • the image processing apparatus (not shown) performs half reconstruction processing based on the first data set 221, and generates a corresponding first image Img1 (see FIG. 11). In addition, half reconstruction processing is performed based on the second data set 222 to generate a second image Img2.
  • the image processing apparatus performs a difference operation between the first image Img1 and the second image Img2. Specifically, as an example, an absolute value of (first image-second image) may be taken, and this value may be determined whether it is zero or not. A difference of zero means that the image portion has not moved. On the other hand, the part where the difference is not zero means the part of the image that has moved.
  • the first image Img1 is divided into an image portion Img (f) having no motion and an image portion Img1 (m) having motion. Understandable.
  • the second image Img2 is divided into an image portion Img (f) having no motion and an image portion Img2 (m) having motion.
  • the first image Img1 and the second image Img2 have relative motions and partially differ in the position of the object on the image.
  • the image portions Img (f) are common.
  • the remaining image portion Img1 (m) changes so as to move to the image portion Img2 (m) from time t (A) to t (C).
  • edge extraction processing is performed on the image site Img1 and the image site Img2, and in order to determine how each of the image site Img1 and the image site Img2 corresponds, Perform registration process.
  • estimated intermediate images Img ' can be drawn at those intermediate positions (see also FIGS. 12 and 13).
  • the "intermediate position" may not necessarily be exactly halfway between the image sites Img1 and Img2.
  • edge extraction various methods and algorithms known in the prior art can be used, and they are not limited to specific ones.
  • one final estimated tomographic image can be generated by combining the image portion Img (f) that has not moved and the estimated intermediate image Img ′ generated above.
  • (P1) An image processing apparatus for generating a tomographic image using projection data obtained by imaging an object by an imaging apparatus, the image processing apparatus including an image processing unit, The image processing unit Projection data of a first data set (221) obtained by the imaging device and projection of a second data set (222) whose angle is deviated by 90 ° (or a predetermined angle) with respect to the first data set
  • the first data set includes data of time (t (A)) and time (t (B))
  • the second data set includes data of time (t (B)) and time (t (C)).
  • the entire estimated image is an estimated image at time t (B).
  • the invention of the image processing apparatus described above can be expressed as an invention of an image generation method and an image generation program using the image processing apparatus: (P4) a first image and a second created based on the projection data of the first data set and the projection data of the second data set that is offset by a predetermined angle with respect to the first data set
  • An image generating method for generating an estimated image using an image comprising: Calculating a difference between the first image and the second image to identify a non-moving part and a moving part in the first and second images; Generating an intermediate estimated image using the data of the first image portion in motion and the data of the second image portion in motion; Combining the non-moving portion and the intermediate estimated image to generate an overall estimated image.
  • a computer program for causing a computer or a specific data processing unit to perform the method.
  • the first data set 221 includes two areas a and b
  • the second data set 222 also includes two areas b and c.
  • the present invention may use a data set including three or more multiple regions.
  • the first data set A220 includes areas a, b, c, d
  • the second data set A 221 includes areas c, d, e, f. That is, the second data set A 221 is data delayed from the first data set by a and b.
  • the regions c and d are common parts (corresponding to the region b in FIG. 10).
  • the areas a and e are opposite data
  • the areas b and f are opposite data.
  • estimated image generation similar to that of the above embodiment can be implemented. Specifically, those intermediate estimated images may be combined into a partially reconstructed image based on the common part (regions c, d).
  • the CT apparatus 1 may have a plurality of tubes, but based on the projection data collected by the CT apparatus of such a plurality of tubes, the following It is also possible to perform such an estimated image generation.
  • a first emitting unit 101a and a second emitting unit 101b are provided with an angle of 90 °.
  • projection data for each 90 ° may be collected by each of the emission units 101a and 101b.
  • the data of “90 °” are described here, the present invention is not necessarily limited to this.
  • the first emission part 101a is rotated from the position of angle 0 ° to the position of angle (90 ° + ⁇ ), and the second emission part 101b is angle 90 °. Rotate from the position of to the position of angle (180 ° + ⁇ ).
  • the data of 180 ° as a whole obtained as a result is divided into a plurality of regions a, b, c (c1, c2), d, e as shown in FIG. 15 (b).
  • the time of data collection is the center time of each area. That is, for the regions a, b, c (c1) scanned by the first emission unit 101a, data are collected at times t (A), t (B), t (C), respectively, and the second emission Data will be collected at time t (A), t (B) and t (C) for the regions c (c2), d and e scanned by the unit 101b, respectively.
  • the area c1 is the data scanned by the first emission unit 101a
  • the area c2 is the data scanned by the second emission unit 101b, which differ from the same direction for the same object
  • Data collected at time (C) and t (A) respectively: c1 ... collected at time t (C) c2 ... collected at time t (A)
  • the data in the regions a and e are collected at different times in this way, but since they are opposite data, if there is movement between time t (A) and t (C), the generated image Will be different.
  • an image a '(not shown) corresponding to time t (B) is created from the data of the regions a and e. Then, from c1 and c2, an image c '(not shown) corresponding to time t (B) is created.
  • the same idea as in the first embodiment can be used.
  • an estimated image at time t (B) can be generated at (a ′ + b + c ′ + d).
  • a gantry (100) having an emitting unit (101) for emitting an X-ray and a detector (111) for detecting the X-ray;
  • An image data processing unit (160) for performing an operation based on detection data from the detector;
  • An X-ray CT apparatus (1) comprising The image data processing unit (160)
  • An image is generated using data (120) including the first projection data (A), the second projection data (C) and the third projection data (B), a1: processing of performing partial reconstruction using the first projection data (A) to generate a first image (Im (A)) of the object at time t (A);
  • a process of generating a second image (Im (C)) of the object ;
  • both of a5 and a6 can be implemented, but only one of the processes of a5 and a6 may be performed.
  • the present invention also discloses a computer device (for example, a work station or the like) having a function corresponding to the image data processing unit (160). That is, the present invention may be expressed as an invention of a computer apparatus such as a workstation, not an invention of an X-ray CT apparatus, and the image processing as described above is executed by the computer apparatus Good.
  • An X-ray CT apparatus wherein a scan angle for generating the first to third projection data is 180 ° + additional angle ( ⁇ ).
  • the X-ray CT apparatus wherein the rotation speed of the light emitting unit is in the range of 0.1 sec / rotation to 60 sec / rotation.
  • the X-ray CT apparatus wherein the data of the image is a single slice image or a multi-slice volume image.
  • a method of generating a medical image using data including first projection data, second projection data and third projection data obtained by scanning and imaging a subject with an X-ray CT apparatus (or simply, A method of generating a medical image using data including the first projection data, the second projection data, and the third projection data), b1: performing partial reconstruction using the first projection data to generate a first image of the object at time t (A); b2: Partial reconstruction is performed using second projection data which is opposite data of the first projection data, and the second object of the object at time t (C) after time t (A) Generating an image; b3: Partial reconstruction is performed using the third projection data between the first projection data and the second projection data, and time t (A) between time t (A) and time t (C) Generating a third image in B); b4: acquiring motion information data based on the first image and the second image; b5: transforming the first image using the data of the motion information to generate a first estimated image at time t (B
  • the present invention can also be expressed as an invention of a computer program as follows. That is, the image generation program is an image generation program for executing a method of generating a medical image using data including the first projection data, the second projection data, and the third projection data.
  • the image generation program is an image generation program for executing a method of generating a medical image using data including the first projection data, the second projection data, and the third projection data.
  • the image generation program is an image generation program for executing a method of generating a medical image using data including the first projection data, the second projection data, and the third projection data.
  • the image generation program is an image generation program for executing a method of generating a medical image using data including the first projection data, the second projection data, and the third projection data.
  • the image generation program is an image generation program for executing a method of generating a medical image using data including the first projection data, the second projection data, and the third projection data.
  • the image generation program is an image generation program for executing a method of generating
  • a gantry (100) having an emitting unit (101) for emitting an X-ray and a detector (111) for detecting the X-ray; An image data processing unit (160) for performing an operation based on detection data from the detector; An X-ray CT apparatus (1) comprising The image data processing unit (160) An image is generated using data (120) including the first projection data (A), the second projection data (C) and the third projection data (B), d1: a process of performing partial reconstruction using the first projection data (A) to generate a first image (Im (A)) of the object at time t (A); d2: Partial reconstruction is performed using the second projection data (C) which is opposite data of the first projection data, and the target object at time t (C) after time t (A) A process of generating a second image (Im (C)); d3: Partial reconstruction is performed using the third projection data (B), which is between the first projection data and the second projection data, and between the time t (A) and the time
  • the expression “the average of the first estimated image (Im (A) ′) and the second estimated image (Im (C) ′) is expressed as“ [Im (A) ′ + Im ( C) ') / 2].
  • the present application also discloses the invention of goods expressed as the invention of method and the invention of computer program.
  • the aspect such as half reconstruction has been described above as an example, the present invention is not limited thereto, and may be applied to the case of utilizing full reconstruction (360 ° reconstruction) without departing from the spirit of the present invention. It is.
  • X-ray CT device (imaging device) 100 gantry 101, 101a, 101b X-ray irradiation unit 102 rotation frame 104 data acquisition circuit (DAS) 105 rotation mechanism 106 data acquisition unit 120 data 150 control unit 151 scanner controller 153 input device 155 display device 157 storage device 160 image data processing unit (data processing unit)
  • DAS data acquisition circuit

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Abstract

Une unité de traitement de données d'image (160) du dispositif TDM selon la présente invention est caractérisée en ce qu'elle exécute : un processus d'acquisition de données d'informations de mouvement sur la base d'une première image et d'une deuxième image ; un processus de conduite d'au moins l'un parmi un processus de génération d'une première image estimée Im(A)' à un temps t(B) au moyen des données d'informations de mouvement pour déformer la première image, et un processus de génération d'une deuxième image estimée Im(C)'au temps t(B) au moyen des données d'informations de mouvement pour déformer la deuxième image ; et a6 : un processus de combinaison d'une troisième image (Im(B)) et de la première image estimée (Im(A)') ou la deuxième image estimée (Im(C)') pour générer une image tomographique estimée d'un emplacement d'intérêt au temps t(B).
PCT/JP2018/032143 2017-08-30 2018-08-30 Dispositif tdm à rayons x et procédé de génération d'image WO2019044983A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009297314A (ja) * 2008-06-16 2009-12-24 Ge Medical Systems Global Technology Co Llc Ｘ線断層撮影装置
JP2011511654A (ja) * 2007-12-20 2011-04-14 ウイスコンシン アラムナイ リサーチ ファウンデーシヨン ダイナミック先験的画像制限画像再構成法
JP2011092366A (ja) * 2009-10-29 2011-05-12 Ge Medical Systems Global Technology Co Llc Ｘ線ｃｔ装置およびｘ線ｃｔ画像再構成方法
JP2011200656A (ja) * 2010-03-17 2011-10-13 General Electric Co <Ge> トモグラフィデータ収集及び画像再構成のためのシステム及び方法
US20150243045A1 (en) * 2014-02-21 2015-08-27 Korea Advanced Institute Of Science And Technology Tomography apparatus and method for reconstructing tomography image thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011511654A (ja) * 2007-12-20 2011-04-14 ウイスコンシン アラムナイ リサーチ ファウンデーシヨン ダイナミック先験的画像制限画像再構成法
JP2009297314A (ja) * 2008-06-16 2009-12-24 Ge Medical Systems Global Technology Co Llc Ｘ線断層撮影装置
JP2011092366A (ja) * 2009-10-29 2011-05-12 Ge Medical Systems Global Technology Co Llc Ｘ線ｃｔ装置およびｘ線ｃｔ画像再構成方法
JP2011200656A (ja) * 2010-03-17 2011-10-13 General Electric Co <Ge> トモグラフィデータ収集及び画像再構成のためのシステム及び方法
US20150243045A1 (en) * 2014-02-21 2015-08-27 Korea Advanced Institute Of Science And Technology Tomography apparatus and method for reconstructing tomography image thereof

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