KR101665327B1 - Device and method of computed tomography - Google Patents

Device and method of computed tomography Download PDF

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Publication number
KR101665327B1
KR101665327B1 KR1020150113067A KR20150113067A KR101665327B1 KR 101665327 B1 KR101665327 B1 KR 101665327B1 KR 1020150113067 A KR1020150113067 A KR 1020150113067A KR 20150113067 A KR20150113067 A KR 20150113067A KR 101665327 B1 KR101665327 B1 KR 101665327B1
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South Korea
Prior art keywords
gantry
detector
source
total
sources
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KR1020150113067A
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Korean (ko)
Inventor
이태범
현정호
이재필
서태규
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(주)젬스메디컬
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    • 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
    • A61B6/44—Constructional features of apparatus for radiation diagnosis
    • A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
    • 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
    • A61B6/032—Transmission computed tomography [CT]
    • 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
    • A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4064—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis specially adapted for producing a particular type of beam
    • 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
    • A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
    • A61B6/4208—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
    • A61B6/4241—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector using energy resolving detectors, e.g. photon counting
    • 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
    • A61B6/54—Control of apparatus or devices for radiation diagnosis

Abstract

The present invention provides a CT device which installs N sources on a circumference at the same interval wherein the N sources generate an X ray of a dual energy peak of a fan beam type and drives L gantries having N dual energy detectors installed in an opposite side on the circumference in correspondence with each of the sources to detect a transmission ray of an object to be inspected.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a computed tomography apparatus,

The present invention relates to a computed tomography (CT) apparatus using an X-ray, and more particularly to a stationary gantry CT apparatus. More particularly, the present invention relates to a CT technique having a fan-beam multi-source and a dual energy multi-detector.

X-ray computed tomography (CT) is used in various clinical fields such as diagnosis, real-time imaging during surgery, and post-operative prognostic evaluation. In addition, CT has been applied not only for medical imaging devices but also for nondestructive inspection purposes for industrial cargo products such as airport cargo search or micro structures.

The CT apparatus detects an X-ray incident on a subject, a part of the X-ray is absorbed by the subject, the remaining transmitted radiation is detected by a plurality of detectors arranged in a line or a plane, and then the output data of each detector is converted into an electric signal A tomographic image of the subject is obtained by reconstructing the image.

The CT apparatus according to the related art has a drawback in that it is not easy to control the power and position of the gantry because the gantry provided around the subject is rotated to obtain x-ray projection data. In addition, the CT photographing time for acquiring tomographic image data is long, and it takes a considerable time to reconstruct the obtained projection data to obtain a 3D stereoscopic image, which has been a technical obstacle for using CT in real time during surgery.

A first object of the present invention is to provide a CT apparatus and a method using a fixed gantry.

A second object of the present invention is to provide a CT apparatus and method having a multi-source of a fan beam system in addition to the first object.

A third object of the present invention is to provide a CT apparatus and a method having a dual energy multi-detector in addition to the first and second objects.

The present invention relates to an image forming apparatus including a total of L fixed gantries arranged in sequence, a total of N sources which are installed at equal intervals on the circumference of each of the gantries and generate a fan beam type X- And a transfer unit for transferring the inspected object so as to move vertically through the cross section of the gantry, wherein the detector detects a high energy image from a single exposure, And a dual energy detector for simultaneously acquiring a low energy image and a low energy image.

The present invention is characterized in that a total of N sources generating X-rays of a dual energy peak of a fan beam system are installed at equal intervals on a circumference, and in order to detect a transmitted light ray of a subject, A method for acquiring a computer tomography image of a subject by driving a total of L gantries provided with N dual energy detectors on the opposite side, comprising the steps of: (a) determining a first source of a first gantry at t = t 1 , , The first source of the L-gantry is sequentially operated at intervals of DELTA t / L to sequentially transmit the dual energy transmitted light data to the first detector of the first gantry, , The first detector of the Lth gantry in order; And (b) a n-th source of the first gantry at time t = t 1 + n? T (where 0? N? N) , The n-th source of the L-gantry is sequentially operated in order at intervals of? T / L to transmit the dual energy transmitted light data to the n-th detector of the first gantry, And the nth detector of the L-gantry, wherein the Δt is the time taken for obtaining the tomographic image from the transmitted light data detected by the detector through the X-ray irradiated once by the source The present invention provides a method of driving a CT apparatus.

Since the present invention uses a fixed gantry, gantry power control and motion control are easy, and tomographic images can be acquired quickly with a low-dose X-ray. When a multi-source dual energy detector driving method according to the present invention is applied, it is possible to acquire a high-resolution image in real time.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a gantry constituting a CT device according to a preferred embodiment of the present invention.
2A is a diagrammatic view of a multi-gantry CT apparatus according to the present invention;
FIG. 2B is a diagram schematically showing a source and a detector attached to a multi-gantry CT apparatus according to the present invention in a single drawing. FIG.
Figure 3 illustrates a gantry tomography switching operation sequence in accordance with a preferred embodiment of the present invention.
Figures 4A and 4B show two embodiments of a sequence for operating a multi-gantry / multi-source / multi-detector CT according to the present invention.

Hereinafter, a CT apparatus according to the present invention will be described in detail with reference to FIGS. 1 to 4.

1 is a view showing a gantry constituting a CT apparatus according to a preferred embodiment of the present invention. Referring to FIG. 1, the gantry 100 according to the present invention is characterized by being fixed, rather than rotating. Referring to FIG. 1, a test object 200 is placed on a transfer unit 300, and the transfer unit 300 transfers the test object 200 in the z direction under the control of the controller. In the figure, the plane on which the gantry 100 is placed is conveniently held in the x-y plane.

The fixed gantry 100 according to the present invention is characterized in that a plurality of sources 110 for irradiating a subject 200 with X-ray having a fan beam shape are provided. Referring to Fig. 1, as a preferred embodiment of the present invention, a total of six sources 110 are arranged at equal intervals on the gantry circumference (not shown). In addition, a detector array 120 corresponding to each source is provided on the opposite side of each source, and as a preferred embodiment of the present invention, a total of six detector arrays 120 are arranged on the circumference of the gantry (Not shown). Here, according to the preferred embodiment of the present invention, the detector array 120 may be constituted by a total of six photodetectors, and is not necessarily limited thereto.

As a preferred embodiment of the present invention, a plurality of gantries are provided to obtain a tomographic image. The method according to the present invention can be referred to as a multi-gantry CT for convenience.

2A is a diagram schematically illustrating a multi-gantry CT apparatus according to the present invention. Referring to FIG. 2A, as one embodiment of the present invention, three gantries 100, 101, and 102 are shown. The CT apparatus according to an embodiment of the present invention is composed of a total of three gantries, and each gantry has a total of six sources and six detector arrays in total. According to the preferred embodiment of the present invention, the inspected object 200 is placed on the transfer unit 300 and transferred in the z-axis direction by motor control to obtain a tomographic image of the x-y plane.

 FIG. 2B is a view schematically showing a source and a detector attached to a multi-gantry CT apparatus according to the present invention in a single drawing. Note that a total of 18 sources and a detector array are shown because they are shown superimposed on one drawing.

3 is a view showing a gantry-based tomographic switching operation sequence according to a preferred embodiment of the present invention. 3, the first source and the first source of the second gantry, the first source of the third gantry of the first gantry are spaced from each other by 10 ° are provided on the gantry circumference, taken from T 1 cycle To obtain a tomographic image.

Here, if a total of L gantries are used and a total of N sources and detectors are used for each gantry in accordance with the preferred embodiment of the present invention, the spacing angle between the sources sutured to each gantry is 360 DEG / (L x N). At this time, the timing for acquiring the monochrome screen may be operated in a normal mode (see Fig. 4A), which is sequentially performed in the T 1 cycle, or in a high speed mode (Fig.

Referring again to Fig. 3, in the T 2 cycle, x-rays are irradiated on the subject from the second source of the first gantry, the second source of the second gantry, and the second source of the third gantry, The transmitted X-rays are detected by a second detector provided on the opposite side in correspondence with the X-ray detector, and sent to a processor (not shown) to be converted into a tomographic image.

Referring to Figure 3, following the same way as in the period T N of the first gantry an N source, the N source of the second gantry, the N source of the gantry 3, ... , The X-ray source is irradiated to the subject from the Nth source of the L-gantry, and the X-ray detector is detected in the Nth detector provided on the opposite side of the gantry in correspondence with the Nth source and sent to a processor (not shown) .

4A and 4B are diagrams illustrating two embodiments of a sequence for operating a multi-gantry / multi-source / multi-detector CT according to the present invention. The sequence shown in FIG. 4A may be referred to as a sequential switching mode, and the sequence shown in FIG. 4B may be referred to as a high-speed switching mode.

4A, x-rays are sequentially emitted from a first source of a first gantry, a first source of a second gantry, and a first source of a third gantry in a period t 0 to t 1 (period T 1 ) To obtain a tomographic image.

If the time taken to acquire the image from the amount of transmitted X-rays detected at the detector by the X-rays projected from one source is? T, the signal that triggers the first source of each gantry is applied at the timing? T / L . For example, if the time Δt required to acquire an image from the amount of transmitted x-rays detected by the detector after the x-ray is projected from one source is 20 to 25 msec, then all the sources constituting each gantry detect the transmitted x- Since the time taken is T = NΔt, it is possible to obtain the number of 3D images per second f = 1 / T = 6.6 to 8.3 Hz, that is, 7 to 8 times per second.

Referring to FIG. 4B, at the first source of the first gantry, the first source of the second gantry, and the first source of the third gantry in the period t 0 to t 1 (period T 1 ) So that a tomographic image is obtained. The time Δt required to acquire an image from the amount of transmitted X-rays detected by the detector after the X-ray is projected from one source is about 8 to 10 msec, and the time required for all the sources constituting each gantry to detect the transmitted X- Becomes T = 6Δt, so that the number of times the 3D image per second can be acquired is f = 1 / T = 16.6 to 20 Hz, that is, about 20 times.

The CT apparatus according to the present invention is characterized by having a dual energy detector. The dual energy detector according to the present invention detects the amount of transmitted light that is generated by irradiating a subject with high energy (e.g., 120 keV) of X-rays with a high energy (e.g., 120 KeV) And acquires an image. The X-ray source generates a single wide spectrum or multiple peak X-ray spectra, and the energy of the incident x-ray photons is discriminated by using a filter at the detector side, Obtain energy image

The foregoing has somewhat improved the features and technical advantages of the present invention in order to better understand the claims of the invention described below. Additional features and advantages that constitute the claims of the present invention will be described in detail below. It is to be appreciated by those skilled in the art that the disclosed concepts and specific embodiments of the invention can be used immediately as a basis for designing or modifying other structures to accomplish the invention and similar purposes.

In addition, the inventive concepts and embodiments disclosed herein may be used by those skilled in the art as a basis for modifying or designing other structures to accomplish the same purpose of the present invention. It will be apparent to those skilled in the art that various modifications, substitutions and alterations can be made hereto without departing from the spirit or scope of the invention as defined in the appended claims.

Since the present invention uses a fixed gantry, gantry power control and motion control are easy, and tomographic images can be acquired quickly with a low-dose X-ray. If the multi-source dual energy detector driving method according to the present invention is applied, high-resolution images can be acquired in real time.

Claims (2)

A total of L fixed gantries arranged in sequence;
A total of N sources installed at the same interval on the circumference of each of the gantries and generating a fan beam type X-ray, and a total of N sources arranged on the opposite sides corresponding to the respective sources N detectors; And
A conveying unit for conveying the object to move vertically through the cross section of the gantry
Wherein the detector is a dual energy detector for simultaneously acquiring a high energy image and a low energy image from a single exposure. A total of N sources generating X-rays of a dual energy peak of a fan beam system are installed at regular intervals on the circumference and a total of A method for acquiring a computer tomography image of a subject by driving a total of L gantries equipped with N dual energy detectors,
(a) the first source of the first gantry at time t = t 1 , ... , The first source of the L-gantry is sequentially operated at intervals of DELTA t / L to sequentially transmit the dual energy transmitted light data to the first detector of the first gantry, , The first detector of the Lth gantry in order; And
(b) the n-th source of the first gantry at time t = t 1 + nΔt (where 0 ≦ n ≦ N) , The n-th source of the L-gantry is sequentially operated in order at intervals of? T / L to transmit the dual energy transmitted light data to the n-th detector of the first gantry, , And sequentially detecting in the nth detector of the Lth gantry
Wherein? T is the time taken for the X-ray irradiated by the source to pass through the object to acquire a tomographic image from the transmitted light data detected by the detector.
KR1020150113067A 2015-08-11 2015-08-11 Device and method of computed tomography KR101665327B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101980533B1 (en) * 2018-07-24 2019-05-21 주식회사 레메디 Dual energy X-ray apparatus
KR20220048457A (en) 2020-10-12 2022-04-19 주식회사 에스에스티랩 Computed tomography apparatus, driving and manufacturing method thereof

Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH06296607A (en) * 1993-04-19 1994-10-25 Toshiba Medical Eng Co Ltd X-ray ct device
KR100863747B1 (en) * 2007-01-05 2008-10-16 가톨릭대학교 산학협력단 An apparatus for computerized tomography comprising a pair of synchronized gantries
US9014328B2 (en) * 2011-04-05 2015-04-21 Triple Ring Technologies, Inc. Method and apparatus for advanced X-ray imaging systems
KR20150060377A (en) * 2013-11-26 2015-06-03 한국전기연구원 Apparatus for multi-energy X-ray using laser plasma light source

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06296607A (en) * 1993-04-19 1994-10-25 Toshiba Medical Eng Co Ltd X-ray ct device
KR100863747B1 (en) * 2007-01-05 2008-10-16 가톨릭대학교 산학협력단 An apparatus for computerized tomography comprising a pair of synchronized gantries
US9014328B2 (en) * 2011-04-05 2015-04-21 Triple Ring Technologies, Inc. Method and apparatus for advanced X-ray imaging systems
KR20150060377A (en) * 2013-11-26 2015-06-03 한국전기연구원 Apparatus for multi-energy X-ray using laser plasma light source

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101980533B1 (en) * 2018-07-24 2019-05-21 주식회사 레메디 Dual energy X-ray apparatus
WO2020022664A1 (en) * 2018-07-24 2020-01-30 주식회사 레메디 Dual energy x-ray photographing device
KR20220048457A (en) 2020-10-12 2022-04-19 주식회사 에스에스티랩 Computed tomography apparatus, driving and manufacturing method thereof
WO2022080797A1 (en) * 2020-10-12 2022-04-21 주식회사 에스에스티랩 Computed tomography device, and manufacturing method and driving method thereof
KR102595517B1 (en) * 2020-10-12 2023-10-30 주식회사 에스에스티랩 Computed tomography apparatus, driving method thereof
EP4218590A4 (en) * 2020-10-12 2024-03-20 Sstlabs Computed tomography device, and manufacturing method and driving method thereof

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