WO2014168288A1 - Dispositif d'imagerie aux rayons x et procédé d'imagerie pour dispositif d'imagerie aux rayons x - Google Patents

Dispositif d'imagerie aux rayons x et procédé d'imagerie pour dispositif d'imagerie aux rayons x Download PDF

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WO2014168288A1
WO2014168288A1 PCT/KR2013/005011 KR2013005011W WO2014168288A1 WO 2014168288 A1 WO2014168288 A1 WO 2014168288A1 KR 2013005011 W KR2013005011 W KR 2013005011W WO 2014168288 A1 WO2014168288 A1 WO 2014168288A1
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interest
detector
region
image
ray
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PCT/KR2013/005011
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English (en)
Korean (ko)
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전진환
뉴엔반장
이창윤
서동은
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(주)제노레이
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    • A61B6/51—
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computerised tomographs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/027—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral

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  • the present invention relates to an imaging method of an X-ray imaging apparatus for acquiring an image of a subject using X-rays and an X-ray imaging apparatus for the same, and more particularly, to capture a region of interest in which image information is required as a local part of a subject. Accordingly, the present invention relates to an imaging method of an X-ray imaging apparatus capable of obtaining a cross-sectional image and / or a three-dimensional image of a region of interest wider than the detector using a smaller detector, and an X-ray imaging apparatus therefor.
  • An X-ray imaging apparatus that is, an X-ray imaging apparatus projects projection data of a subject by using the characteristic that the intensity of the X-rays is attenuated according to the physical properties and distance of the subject when the X-ray passes through the subject. Acquire a device and image it. For example, when irradiating X-rays to a human, a projection image of the inside of the body may be obtained by using an X-ray attenuation coefficient that varies according to the type and characteristics of the biological tissue.
  • An X-ray computed tomography imaging device which is an example of an X-ray imaging apparatus, may include an X-ray generator that irradiates the X-rays to the subject so that X-rays may pass through the subject, and a detector that detects the X-rays that pass through the subject It is configured to include.
  • the X-ray generator and the detector are generally provided in an arm supporting the X-ray generator and the detector, and acquire image information of the subject while rotating around the subject while facing each other.
  • the cross-sectional image of the subject may be generated by irradiating X-rays to the subject at various angles to obtain projection data and performing an image reconstruction process to reconstruct the cross-sectional image from the projection data.
  • CBCT Cone Beam Computed Tomography
  • panoramic imaging techniques have been used to acquire images of all teeth and their surrounding structures at once.
  • the two-dimensional panoramic image shows a predetermined curved structure along the patient's jaw, and due to the relatively low price, the panoramic imaging device is widely used for diagnosis for dental procedures.
  • the X-ray generator and the detector are mounted on an arm and fixed to opposite sides.
  • the arm is mounted to a moving means, and the moving means rotates the arm around a subject to be processed along a predetermined trajectory.
  • the conventional panoramic imaging apparatus includes an X-ray generator 10 and a detector 20 disposed to face each other at a predetermined distance, and the X-ray generator 10 and the detector 20 are subjects. Projection data for the subject is acquired while rotating around (1), and the projection data is reconstructed into the cross section of the subject to obtain a cross-sectional image.
  • the width W of the detector 20 is large enough to allow all of the X-ray beam 10a to cover the object, particularly the entire region of interest.
  • FIG. 2 illustrates a conventional method using an X-ray beam having the same size as the ROI 2 requiring image information and a detector 20 having a width large enough to cover the projection of the entire ROI 2.
  • An example of tomography imaging is shown.
  • the X-ray generator 10 is disposed at one side of the subject 1 or the region of interest 2, and the detector 20 is disposed at the other side. X-rays generated by the X-ray generator 10 are transmitted through the ROI 2 and detected by the detector 20 on the opposite side.
  • the X-ray generator 10 and the detector 20 are mounted on the suspension arm of the imaging apparatus so that the X-ray generator 10 and the detector 20 are located opposite to each other, and the subject or the region of interest 2 is formed of the suspension arm. It is located on the axis of rotation.
  • image data of the region of interest for example, cross-sectional slices, may be obtained through acquiring projection data of the region of interest from various angles and reconstructing the technique.
  • 3A and 3B relate to conventional tomosynthesis image acquisition, wherein the X-ray generator 10 and the detector 20 are positioned at the focal plane 3 on the subject when the X-ray generator 10 and the detector 20 simultaneously move at the same speed in opposite directions.
  • the distant areas appear faint while the distant areas appear clear.
  • the tomosynthesis is projection data while the X-ray generator and the detector move at a limited photographing angle of typically 20 to 60 degrees along a parallel plane or circular orbit as shown in FIG. 3A or 3B with the subject therebetween. Is obtained, a slice image is obtained from the projection data, and a 3D image is reconstructed through a reconstruction algorithm.
  • the conventional X-ray imaging apparatus and the imaging method of the X-ray imaging apparatus described above is a problem in the reality that the radiation exposure problem is emerging because the use of a large expensive detector and the problem of exposing the patient to a large amount of radiation.
  • An object of the present invention is an imaging method of an X-ray imaging apparatus capable of acquiring image information (section image or 3D image) of a region of interest using a detector having a narrow width, which is difficult to cover the entire region of interest with a single detector, and An X-ray imaging apparatus is provided.
  • the method according to the present invention provides an imaging method and an X-ray imaging apparatus of an X-ray imaging apparatus for acquiring a plurality of partial projection data of a region of interest along a predetermined trajectory and effectively reconstructing image information of the region of interest from them.
  • the present invention includes an X-ray generator for generating an X-ray beam, and a detector having a narrow width for receiving the X-ray beam and generating projection data for a region of interest that is a part of an object, and controlling an optimal trajectory for image acquisition processing.
  • An imaging method of an imaging apparatus and an X-ray imaging apparatus is provided.
  • the region of interest in order to obtain a plurality of pieces of partial projection data of a region of interest in which image information is required as a part of a subject, the region of interest is moved by moving the X-ray generator and the detector rotating in the state facing each other. (A) scanning the whole; And (b) reconstructing the image of the region of interest using the plurality of sub-projection data to obtain image information of the region of interest.
  • step (b) the image of the ROI is reconstructed using partial projection data having no overlapping data among the plurality of projection data and partially dividing the entire ROI.
  • step (a) the entire ROI is scanned in a plurality of different directions, and a plurality of partial projection images of the ROI are obtained for each direction.
  • step (a) is; And scanning the entire region of interest in one direction of the region of interest through a rotational movement and a translational movement of the support unit in which the X-ray generator and the detector are mounted to face each other.
  • step (a); The angle of the X-ray beam incident on the detector is ⁇ and the support unit moves from the first position to the second position to scan the entire region of interest in either direction of the region of interest so that the rotational movement angle of the detector is ⁇ .
  • the X-ray generator and the center of rotation of the detector (C ' x , C' y ) and the position (S ' x , S' y ) of the X-ray generator is (T x + ⁇ v x , T y + ⁇ v y ), respectively And moving the support unit to be (S x + ⁇ v x , S y + ⁇ v y ).
  • the rotation center of the support unit is (C x , C y ) and the position of the X-ray generator is (S x , S y ); the line connecting the X-ray generator and the detector and the rotation center of the support unit are La ⁇ the angle moving the line (l) are forms, and; (S x, S y) of La center as (C x, C y) is (T x, T y) to a position rotated by ⁇ , and; (C x , C y ) and the center of (T x , T y ) are called (M x , M y ); (v x , v y ) connects (M x , M y ) and (S x , S y ) the vector; ⁇ represents the moving distance of (T x, T y) the vector (v x, v y) is moved in a direction (T x, T y) for the matching to the
  • the image of the ROI in step (b) includes any one of a 3D image and a cross-sectional image of the ROI.
  • the step (b); Reconstructing an image of the ROI by receiving a plurality of partial projection data of the ROI as input data of a reconstruction algorithm.
  • the present invention provides a support unit capable of translating and rotating motions;
  • An imaging unit provided on one side of the support unit to have an X-ray generator emitting X-rays and a detector provided on the other side of the support unit to move in a state facing the X-ray generator;
  • the X-ray generator and the detector move while facing each other.
  • the present invention also provides an X-ray imaging apparatus including a reconstruction unit for reconstructing an image of the ROI using a plurality of sub-projection data of the ROI.
  • the control unit The angle of the X-ray beam incident on the detector is ⁇ , and the support unit moves from the first position to the second position to scan the entire region of interest in either direction of the region of interest so that the rotational movement angle of the detector is ⁇ .
  • the rotation centers C ' x , C' y of the X-ray generator and the detector and the positions S ' x , S' y of the X-ray generators are (T x + ⁇ v x , T y + ⁇ v y ), respectively.
  • the movement of the support unit is controlled to be (S x + ⁇ v x , S y + ⁇ v y ).
  • the control unit controls the movement of the supporter unit to scan the entire region of interest in a plurality of different directions to obtain a plurality of partial projection images of the region of interest in each direction.
  • the reconstruction unit reconstructs an image of the ROI by using partial projection data having no overlapping data among the plurality of projection data and partially dividing the entire ROI.
  • the imaging method of the X-ray imaging apparatus may be applied, and may be applied to other X-ray imaging apparatuses such as a C-arm X-ray apparatus or a mammography imaging apparatus.
  • the present invention provides an image reconstructor, i.e., a reconstruction unit, for reconstructing an image of a region of interest from projection data obtained by an X-ray generator and a detector, wherein the image reconstructor is an iterative method, for example, An image of the ROI may be reconstructed using a block reconstruction technique such as an OSC algorithm.
  • an image reconstructor i.e., a reconstruction unit
  • the image reconstructor is an iterative method, for example, An image of the ROI may be reconstructed using a block reconstruction technique such as an OSC algorithm.
  • the present invention it is possible to obtain a cross-sectional image or a three-dimensional image of a region of interest of a subject, that is, a region in which image information is required, using a low-cost narrow detector rather than a large and expensive detector. It can minimize the exposure of the patient to radiation, and the penetration rate of the X-ray imaging apparatus can be greatly extended to the small-scale dental hospital.
  • artificial shading can be minimized and an image reconstruction procedure can be simplified, thereby reducing the time required for data processing.
  • an image of any region of interest in a subject without having to place the region of interest at the center of rotation of the X-ray generator and the detector. If an image or a single-sided image is required, an existing X-ray imaging apparatus, for example, a panorama apparatus or a C-arm apparatus, can be used as it is.
  • FIG. 1 is a diagram illustrating a general X-ray imaging method.
  • FIG. 2 is a view showing a photographing method of a conventional tomography imaging method using a wide detector.
  • 3A and 3B are diagrams illustrating a conventional tomosynthesis image acquisition process.
  • FIG. 4 is a side view showing an embodiment of an X-ray imaging apparatus to which the imaging method of the X-ray imaging apparatus according to the present invention is applied.
  • FIG. 5 is a schematic plan view of the X-ray imaging apparatus of FIG. 4.
  • 6A and 6B illustrate a principle of an imaging method of an X-ray imaging apparatus that scans an entire region of interest using a narrow detector and acquires a plurality of partial projection data.
  • 6C is a view showing a method of deriving the rotation angle and the linear movement amount (translational movement distance) of the detector in the present invention.
  • FIG. 7 illustrates an example of capturing a region of interest in which a single detector cannot cover the whole using a narrow detector based on an X-ray imaging apparatus and an imaging method according to the present invention.
  • FIG. 8 is a diagram illustrating an example of photographing a molar region of a jawbone, which is a region of interest, based on an X-ray imaging apparatus and an imaging method according to the present invention.
  • FIG. 9 is a diagram illustrating an example of photographing an anterior region of a jawbone, which is a region of interest, based on an X-ray imaging apparatus and an imaging method according to the present invention.
  • FIG. 10 is a diagram illustrating an example of photographing a posterior region of the jawbone, which is the ROI of the present invention, in a faster scan mode than the position shown in FIG. 8.
  • 11A and 11B are diagrams illustrating coverage angles of the posterior region and the posterior region, respectively, in the present invention.
  • FIG. 12 is a diagram illustrating an example of classifying (grouping) partial projection data in the present invention.
  • 13A and 13B illustrate a method of selecting partial projection data for reconstruction from a plurality of partial projection data obtained in a continuous scanning mode.
  • FIG. 14 is a table illustrating a method of selecting partial projection data for reconstructing a projection image from the partial projection data obtained in the continuous scan mode.
  • 15 is a flowchart schematically showing a processing procedure of an imaging method of an X-ray imaging apparatus according to the present invention.
  • FIGS. 4 and 5 are side views illustrating an example of an X-ray imaging apparatus to which the imaging method of the X-ray imaging apparatus according to the present invention is applied
  • FIG. 5 is a schematic plan view of the X-ray imaging apparatus illustrated in FIG. 4.
  • an X-ray imaging apparatus to which the imaging method of the X-ray imaging apparatus according to the present invention is applied is a support unit. It comprises a (110; Support Unit) and the image taking unit (121, 122) provided in the support unit, the control unit 130 (Control Unit) and the reconstruction unit (140; Reconstruction Unit).
  • the support unit 110 may be a rotational movement and a translational movement, and in this embodiment, a rotational movement of degrees of freedom 1 and a translational movement (linear movement) of degrees of freedom 1 are possible, but the degrees of freedom of the support unit 110 are limited.
  • the center of rotation of the support unit 110 is on the translational axis Axis of the support unit 110.
  • the support unit 110 is provided to be linearly movable along the longitudinal direction of the guide arm 150, and rotates about a rotation axis perpendicular to the longitudinal direction of the guide arm 150.
  • the guide arm 150 is provided in the horizontal direction in the frame 160 of the device body to prevent the interference between the support unit 110 and the frame 160, the frame 160 is It includes a column for supporting a vertical load and a horizontal bar extending in a cantilever form from the top of the pillar, but the shape is not limited thereto.
  • the X-ray imaging apparatus For the rotation of the support unit 110, the X-ray imaging apparatus according to the present invention is provided with a rotary driver 111 and a linear actuator 112, as in the support unit 11 of the present invention the rotational movement and translational movement
  • the technique for implementing possible apparatus is a general technique in the mechanical field, and thus, further description is omitted.
  • the image photographing unit includes an X-ray generator 121 and a detector 122.
  • the X-ray detector 121 is provided in the support unit 110 to emit X-rays (X-ray beam) toward the detector 122, and the detector 122 faces the X-ray generator 121 to face the X-ray generator 121. 110 is provided.
  • the X-ray generator 121 is installed at one side (one end) of the support unit 110, and the detector 122 is provided at the other side (the other end) of the support unit 110,
  • the X-ray generator 121 and the detector 122 face each other to rotate the periphery of the subject P, particularly the periphery of the ROI. Therefore, the X-ray imaging apparatus disclosed in this embodiment basically has a structure of a panoramic imaging apparatus, but the imaging method of the X-ray imaging apparatus according to the present invention is not limited to the above-mentioned panoramic imaging apparatus, but is a C-arm X-ray imaging apparatus or wear. Mammography can also be applied to imaging devices.
  • the X-ray imaging apparatus having a large area detector is not used. You can get the images you need without having to.
  • control unit 130 moves the support unit 110 to scan the entire region of interest while rotating the circumference of the region of interest with the X-ray generator 121 and the detector 122 facing each other.
  • image capturing unit 120 photographs a region of interest having a size larger than that of the image capturing unit 120, in particular, the detector 122, at a time.
  • the control unit controls the movement of the support unit 110 to obtain a projection image.
  • the reconstruction unit 140 reconstructs an image of the ROI by using a plurality of sub-projection data of the ROI.
  • the control unit 130 has a view angle of the detector 122 (the angle of the X-ray beam incident on the detector), and Rotation center of the X-ray generator and the detector at the second position when the support unit 110 moves from the first position to the second position to scan the region of interest in either direction so that the rotational movement angle of the detector is ⁇ .
  • the rotation center of the support unit at the first position is (C x , C y ) and the position of the X-ray generator is (S x , S y );
  • ⁇ is an angle formed by a line connecting the X-ray generator and the detector and a line?
  • control unit 130 repeats the step of sequentially scanning the region of interest by the image capturing units 121 and 122 in different directions, respectively, and generates a plurality of pieces of partial projection data (partly projected images) in each direction.
  • one group of projection image sets may be obtained in either direction of the ROI, and one group of projection image sets may include a plurality of projection data and scan the ROI in different directions. Therefore, a plurality of groups of projection image sets are obtained.
  • the region of interest is scanned, the larger the angle between the direction in which the scan starts and the direction in which the scan ends, the more accurate image reconstruction is possible for the region of interest.
  • the reconstruction unit uses the partial projection data obtained whenever the rotational movement angle of the detector having the angle of view ⁇ is ⁇ , more particularly, the partial projection data of which mutually neighboring partial projection data do not have overlapping data.
  • the image of the area is reconstructed to obtain a cross-sectional image, a longitudinal cross-sectional image, a three-dimensional image (volume data), or the like.
  • a collimator 123 is provided at one side of the X-ray generator 121, that is, the X-ray output side, to limit the width of the X-ray beam incident to the detector 122 to be less than or equal to the width of the detector 122.
  • the image capturing apparatus obtains a plurality of partial projection data by partially capturing a region of interest larger than the region that can be photographed at a time in place, and reconstructs the image of the region of interest using the input data of the reconstruction algorithm. This avoids the use of large and expensive detectors and minimizes radiation exposure to the patient.
  • the imaging method of the X-ray imaging apparatus described below includes an imaging method capable of reducing the width of the detector 121 or a detector having a narrower width than a region of interest (for example, in the case of a panorama apparatus, generally 50 to 60 mm or 48 mm).
  • a detector having a width of a degree in order to obtain a plurality of partial projection data of the region of interest 2 for which image information is required among the internal regions of the subject P, the perimeter of the region of interest (A) scanning the entire region of interest by moving the X-ray generator 121 and the detector 122 rotating with each other facing each other, and in order to obtain image information of the region of interest 2, the plurality of portions. And (b) reconstructing the image of the ROI using projection data.
  • the support unit 110 may be used. Reconstruct the image of the ROI by using the partial projection data obtained when the rotational movement angle of the detector is ⁇ among the plurality of partial projection data obtained by moving, that is, the partial projection data that are adjacent to each other and do not have overlapping data. This can speed up the reconstruction process and reduce data throughput.
  • the region of interest 2 may be scanned in a plurality of different directions to obtain a plurality of groups of projection image sets each having a plurality of partial projection data. More specifically, the entire region of interest is sequentially scanned in various directions with a constant angle difference, and a plurality of pieces of partial projection data are obtained in each direction.
  • the step (a) is a step of scanning the entire region of interest through a rotational movement and a translational movement (linear movement) of the support unit 110 on which the X-ray generator 121 and the detector 122 are mounted.
  • the rotational motion and the translational motion of the support unit 110 are each at least 1 degree of freedom.
  • the support unit moves from the first position to the second position in order to scan the entire region of interest in one direction of the region of interest, with the view angle of the detector being ⁇ .
  • the rotation centers C ' x , C' y of the X-ray generator and the detector and the positions S ' x , S' y of the X-ray generator are (T x + ⁇ v x , T y +), respectively.
  • the support unit is moved to be ⁇ v y ) and (S x + ⁇ v x , S y + ⁇ v y ), and details thereof will be described later.
  • 6A and 6B are views for explaining an imaging method of the X-ray imaging apparatus according to the present invention, that is, the principle of image acquisition for a region of interest.
  • An ideal method of acquiring an image for (2) is to acquire the partial projection images sequentially while rotating the X-ray generator and the detector as shown in FIG. 6A, in any direction of the ROI without the detector 122 moving. It is the mechanism closest to acquiring an image using a wide detector capable of capturing the entire region of interest 2 at a time.
  • the image acquisition mechanism illustrated in FIG. 6A is difficult to be implemented by the X-ray imaging apparatus or the general panorama apparatus of FIG. 5.
  • two neighboring sub-projection data do not have an overlapping portion with each other, so that the support unit 110 as shown in FIG. 6B so as to obtain the entire region of interest projection data with the minimum number of partial projection data.
  • the partial projection data may be extracted using a stop and shooting mode (a driving mode in which the suspension arm acquires partial projection data of a part of the ROI and then moves to the next step to shoot another part).
  • a stop and shooting mode a driving mode in which the suspension arm acquires partial projection data of a part of the ROI and then moves to the next step to shoot another part.
  • the physical center of rotation (the axis of rotation of the support unit) is always located on the guide arm 150 while the support unit 110 is in motion. Therefore, since the projection image set obtained by the imaging method of the X-ray imaging apparatus according to the present invention is irregular unlike the method illustrated in FIG. 6A, this is referred to as an Irregular Projection Image or irregular projection data.
  • reference numeral S illustrates movement of the X-ray generator
  • reference numeral D illustrates movement of the detector
  • the rotation center of the support unit 110 is mounted at the position of (C x , C y ), the position of the X-ray generator 121 is (S x , S y ), and the support unit 110
  • the angle formed by the linear movement direction of the rotation center is ⁇ , and the X-ray generator 121
  • the second position of the support unit can be obtained in the following order, assuming that the sector angle (view angle of the detector) of the X-ray beam incident on the detector 122 is ⁇ .
  • Step 1 Rotate (C x , C y ) by ⁇ around (S x , S y ) to mark the new position of (C x , C y ) as (T x , T y ).
  • Step 2 Calculate the midpoint of (C x , C y ) and (T x , T y ) and call this point (M x , M y ).
  • Step 3 Find the vector (v x , v y ) connecting (M x , M y ) and (S x , S y ).
  • Step 4 vector (v x, v y) direction as a movement amount ⁇ ((T x, T y ) the vector (v x, v y) when moved in a direction in which to place the line (l) (T x, T y Calculate the distance of travel).
  • ⁇ -(T x / v x )
  • Step 5 Linearly move (T x , T y ) and (S x , S y ) by ⁇ in the direction of the vector (v x , v y ), and the new position (C ' x , C) of the rotation center of the support unit ' y ) and the new coordinates (S' x , S ' y ) of the X-ray generator.
  • the present invention controls the support unit to move along the above-described trajectory, so that the plurality of groups of irregular projection images 210, 220, 230 for the ROI 2, that is, the plurality of groups of projection image sets in different directions. You can get it. That is, the inside of the region of interest 2 is obtained as a whole a plurality of groups of irregular projection images, while the outside of the region of interest is incompletely obtained.
  • the irregular projection images may increase the accuracy of the cross-sectional image at various angles depending on the scanning time, the radiation dose passing through the ROI, and the accuracy of reconstruction.
  • FIGS. 8 and 9 show examples of acquiring images of the jaw bone posterior region and the anterior region, which are regions of interest 2 using the present invention, respectively. This is obtained in different directions. More specifically, panoramic images of the posterior region of the patient are obtained at different angles. Panoramic images and cross-sectional slices obtained by the imaging method of the X-ray imaging apparatus according to the present invention can greatly improve the visibility of the internal structure of the region of interest. And useful cross-sectional sections can be obtained by using only a plurality of sets of projection image sets (irregular projection images). In the case where the subject (patient's head) is located as shown in FIGS. 8 and 9, the scanning time of the anterior region is shorter than the scanning time of the posterior region shown in FIG. 8.
  • a fast scan mode applied to quickly acquire an image (projection image set) of the anterior region may be used to acquire image information about the posterior region.
  • the scan mode is possible because the movement trajectory of the X-ray generator and the detector is shortened to acquire an image of the posterior region.
  • FIG. 11A shows an effective coverage angle for off-axis molar regions off the center of rotation of the support unit.
  • the coverage ankle expands as the region of interest moves closer to the axis of the guide arm 150 and is maximized when the center of the region of interest is located on the axis of the guide arm 150 as shown in FIG. 11B.
  • FIG. 12 illustrates an example of grouping partial projection data obtained in various directions by the present invention, and obtaining N groups of projection image sets in N directions.
  • the imaging method of the X-ray imaging apparatus may be used in various digital X-ray imaging apparatuses such as a panoramic imaging apparatus, a mammography apparatus, and a surgical seed cancer apparatus. It can be used to acquire a three-dimensional structure or cross-sectional image of the object.
  • the detector 122 may continuously acquire an image of the ROI while the detector 122 moves while rotating around the subject. In this continuous acquisition mode, the detector 122 may be set to 1 / FR seconds.
  • the X-ray generator 121 continuously emits radiation while recording the projection data.
  • FR frames per second
  • 13A to 14 illustrate a method of processing one group of irregular projection images when the X-ray imaging apparatus according to the present invention is operated in a continuous acquisition mode.
  • each sub-projection image has a view angle of ⁇ and that the ROI is completely covered by N pieces of partial projection data that do not overlap each other.
  • the step-by-step rotation angle of the detector 122 for acquiring the partial projection data is ⁇ ( ⁇ )
  • the number of partial projection images acquired by the detector 122 is (N-1) ⁇ ⁇ / ⁇ .
  • each irregular projection image may be composed of (N-1) partial projection images, and all partial projection data in the reconstruction.
  • the partial projection data forming one projection data set for reconstruction may be selected in various forms as shown in FIG. 14, and the unit projection data may be selected in units of ⁇ by different starting data of the partial projection data grouped into one set. Thereby grouping into one set of projection images consisting of a minimum number of partial projection data, wherein different sets of projection images (irregular projection images) differ in very small angles ⁇ .
  • the imaging method refers to a method of acquiring projection data and reconstructing an image of a region of interest, for example, a three-dimensional structure or a cross-sectional structure.
  • the present invention uses a tomosinte using a slice as input data for reconstruction.
  • the 3D image of the ROI is obtained by using the partial projection data as input data of the direct reconstruction algorithm.
  • a plurality of partial projection data are obtained at a plurality of angles, respectively, and the plurality of partial projections.
  • the data are grouped so that irregular projection data (projected image set) are each obtained in multiple directions.
  • the irregular projection data are used as input data for reconstruction, and image reconstruction of the ROI is performed.
  • the reconstruction algorithm includes a block-iterative reconstruction technique such as an ordered subsets convex algorithm, and more specifically, an image reconstruction technique in CT (computed tomography) may be applied.
  • the imaging method of the X-ray imaging apparatus and the X-ray imaging apparatus according to the present invention is a technique of reconstructing a cross-sectional image of a region of interest or a three-dimensional image of the entire region of interest using projection data acquired by a small detector. It can be used in various fields in the medical field, such as the instrument field and dental field, and other industrial fields requiring radiography.

Abstract

La présente invention concerne un dispositif d'imagerie aux rayons X comprenant un générateur de rayons X destiné à générer un faisceau de rayons X et un détecteur étroit destiné à recevoir le faisceau de rayons X et à générer des données de projection sur une région d'intérêt correspondant à une partie d'un sujet, et contrôlant une trajectoire optimale pour la mise en œuvre de l'acquisition d'image, et un procédé d'imagerie pour dispositif d'imagerie aux rayons X. Selon la présente invention, le coût du dispositif d'imagerie aux rayons X peut être minimisé ainsi que l'exposition des patients aux rayonnements, car une image de section transversale de la région la plus large possible d'un sujet nécessitant l'imagerie aux rayons X peut être obtenue en utilisant le détecteur étroit au lieu d'un détecteur onéreux de grande dimension. De plus, selon la présente invention, la génération d'artefacts peut être minimisée et une procédure de reconstruction d'image peut être simplifiée, réduisant ainsi le temps nécessaire au traitement des données.
PCT/KR2013/005011 2013-04-10 2013-06-07 Dispositif d'imagerie aux rayons x et procédé d'imagerie pour dispositif d'imagerie aux rayons x WO2014168288A1 (fr)

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KR1020130039023A KR101531370B1 (ko) 2013-04-10 2013-04-10 엑스선 영상장치 및 엑스선 영상장치의 이미징 방법

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KR101662067B1 (ko) * 2015-07-03 2016-10-05 한국과학기술원 듀얼 검출기를 이용한 엑스선 단층촬영장치 및 방법
KR102026716B1 (ko) * 2017-11-15 2019-09-30 주식회사 에스엠디솔루션 엑스선 영상 촬영장치 및 이를 사용한 촬영방법

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US5032990A (en) * 1989-05-30 1991-07-16 General Electric Company Translate rotate scanning method for x-ray imaging
US5511106A (en) * 1993-07-06 1996-04-23 Siemens Aktiengesellschaft X-ray diagnostics installation for producing x-ray exposures of body parts of a patient
US20090041178A1 (en) * 2004-07-01 2009-02-12 Instrumentarium Corporation Method for producing a three-dimensional digital x-ray image
KR20090130719A (ko) * 2008-06-16 2009-12-24 주식회사바텍 토모그래피 영상획득방법
JP2012045099A (ja) * 2010-08-25 2012-03-08 Fujifilm Corp 放射線画像撮影用グリッド及びその製造方法、並びに放射線画像撮影システム

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5032990A (en) * 1989-05-30 1991-07-16 General Electric Company Translate rotate scanning method for x-ray imaging
US5511106A (en) * 1993-07-06 1996-04-23 Siemens Aktiengesellschaft X-ray diagnostics installation for producing x-ray exposures of body parts of a patient
US20090041178A1 (en) * 2004-07-01 2009-02-12 Instrumentarium Corporation Method for producing a three-dimensional digital x-ray image
KR20090130719A (ko) * 2008-06-16 2009-12-24 주식회사바텍 토모그래피 영상획득방법
JP2012045099A (ja) * 2010-08-25 2012-03-08 Fujifilm Corp 放射線画像撮影用グリッド及びその製造方法、並びに放射線画像撮影システム

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