WO2007122882A1 - X線ct装置 - Google Patents
X線ct装置 Download PDFInfo
- Publication number
- WO2007122882A1 WO2007122882A1 PCT/JP2007/054520 JP2007054520W WO2007122882A1 WO 2007122882 A1 WO2007122882 A1 WO 2007122882A1 JP 2007054520 W JP2007054520 W JP 2007054520W WO 2007122882 A1 WO2007122882 A1 WO 2007122882A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ray
- detector
- image
- energy
- projection data
- Prior art date
Links
- 239000007787 solid Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims 2
- 230000002194 synthesizing effect Effects 0.000 claims 2
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 11
- 210000000056 organ Anatomy 0.000 description 11
- 210000000988 bone and bone Anatomy 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 5
- 239000002872 contrast media Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 101000916532 Rattus norvegicus Zinc finger and BTB domain-containing protein 38 Proteins 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 230000003902 lesion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910004613 CdTe Inorganic materials 0.000 description 1
- 238000013170 computed tomography imaging Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
- G01T1/2914—Measurement of spatial distribution of radiation
- G01T1/2985—In depth localisation, e.g. using positron emitters; Tomographic imaging (longitudinal and transverse section imaging; apparatus for radiation diagnosis sequentially in different planes, steroscopic radiation diagnosis)
-
- 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]
- A61B6/032—Transmission computed tomography [CT]
-
- 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
- A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4208—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
- A61B6/4241—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 or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/48—Diagnostic techniques
- A61B6/482—Diagnostic techniques involving multiple energy imaging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
- G01T1/2914—Measurement of spatial distribution of radiation
- G01T1/2921—Static instruments for imaging the distribution of radioactivity in one or two dimensions; Radio-isotope cameras
- G01T1/2935—Static instruments for imaging the distribution of radioactivity in one or two dimensions; Radio-isotope cameras using ionisation detectors
Definitions
- the present invention relates to an X-ray CT apparatus, and more particularly to an X-ray CT apparatus capable of acquiring X-ray CT images according to energy.
- Patent Document 1 discloses a two-dimensional thin film gas apparatus.
- Patent Document 1 JP 2004-77132 A
- Patent Document 2 Patent No. 3354551
- the present invention has been made in view of the above-described object, and an object thereof is to provide an energy discrimination type X-ray CT apparatus that can improve image quality at a lower cost.
- an X-ray CT apparatus discriminates X-ray energy from an X-ray source that irradiates continuous X-rays including a plurality of X-ray energies and generates X-rays.
- a first X-ray detector for outputting first projection data capable of discriminating X-ray energy
- Rotating means for mounting and rotating the X-ray source and the first X-ray detector, and the first projection data Image processing means for generating a first reconstructed image in which the X-ray energy is identified, and display means for displaying the image generated by the image processing means.
- FIG. 1 is a conceptual diagram showing the configuration of an X-ray CT apparatus 1
- FIG. 3 is a block diagram for showing a flow of projection data and a reconstructed image in the X-ray CT apparatus 1 according to the first embodiment.
- FIG. 4 (a) and (b) are schematic diagrams illustrating a pixel electrode type detector.
- FIG.5 Schematic diagram explaining the movement of X-ray photons in a pixel electrode detector
- FIG. 6 (a), (b) and (c) are diagrams explaining the beam hardening effect.
- FIG.7 Schematic diagram explaining how to count and reconstruct X-ray photons for each X-ray energy
- FIG.8] (a) and (b) are diagrams explaining the difference in images due to energy discrimination.
- FIG. 9 is a block diagram for showing a flow of projection data and a reconstructed image in the X-ray CT apparatus 1 according to the second embodiment.
- the first embodiment relates to an X-ray CT apparatus equipped with a two-dimensional energy discrimination detector.
- FIG. 1 is a conceptual diagram showing a configuration of an X-ray CT apparatus 1 that is effective in one embodiment of the present invention.
- FIG. 2 is a block diagram showing a hardware configuration of the X-ray CT apparatus 1 in FIG.
- An X-ray CT apparatus 1 in FIG. 1 includes a scanner rotating unit 10 that outputs projection data, an image processing apparatus 20 that performs image reconstruction processing based on the projection data, and generates a reconstructed image. And an image display device 30 for displaying a synthesized image.
- the scanner rotating unit 10 includes an X-ray source including an X-ray tube 11 that irradiates an X-ray beam that spreads in a cone or pyramid shape, and a detector that detects transmitted X-rays. 12 and.
- the scanner rotating unit 10 includes a rotating plate 13 that rotates around the subject 50 placed on the bed 40 with the X-ray source 11 and the detector 12 facing each other.
- the detector 12 detects transmitted X-rays that have passed through the subject 50, and outputs projection data via a data acquisition device (hereinafter referred to as “DA S”) 14.
- DAS 14 is connected to preamplifier 15.
- the preamplifier 15 amplifies the projection data received from the DAS 14 and transfers the amplified projection data to the image processing device 20.
- the rotation per turn of the turntable 13 equipped with the X-ray tube 11 and the detector 12 is increased to less than 0.5 seconds.
- a multi-slice detector having a structure in which multiple rows are arranged in the body axis direction is widely used so that a plurality of tomographic images can be obtained by one scan.
- the image processing device 20 includes a CPU 21, a main memory 22 for storing control programs and image processing programs for the image processing device 20, a magnetic disk 23 for storing projection data, an image processing program, and the like, and parameters such as an effective visual field range.
- a keyboard 24 for making settings, a pointing device such as a mouse 25, a trackball, a joystick, and its controller 26, a display memory 27 for temporarily storing image data to be displayed on the image display device 30, and a scanner Input / output interface that acquires projection data from the rotating unit 10 28.
- the above components are connected to each other by a common bus 29.
- the image processing device 20 may include a power storage device including a main memory 22 and a magnetic disk 23 as a storage device, and other storage devices such as an FDD, a CD-RW drive, an M0 (optical disk) drive, and a ZIP drive.
- a power storage device including a main memory 22 and a magnetic disk 23 as a storage device
- other storage devices such as an FDD, a CD-RW drive, an M0 (optical disk) drive, and a ZIP drive.
- the image processing apparatus 20 of the X-ray CT apparatus 1 is installed with an image processing program for reconstructing projection data and generating a reconstructed image.
- the CPU 21 appropriately loads an image processing program onto the main memory 22 and executes it, thereby constituting a reconstruction processing unit for reconstructing the projection data output from the detector 12.
- the image display device 30 includes a CRT device, a liquid crystal display device, and the like.
- FIG. 3 is a block diagram for showing the flow of projection data and a reconstructed image in the X-ray CT apparatus 1.
- the detector 12 is configured as a photon counting detector 122 that discriminates and detects continuous X-rays including a plurality of X-ray energies irradiated by the X-ray source for each X-ray energy.
- the photon counting detector 122 includes a drift electrode 122a, an MSGC (Micro Strip Gas Chamber) 122b provided at a predetermined distance, and a gas between the drift electrode 122a and the MSGC 122b. And a drift region 122c configured by encapsulating.
- MSGC Micro Strip Gas Chamber
- gas is sealed in the drift region 122c between the drift electrode 122a and the MSGC 122b, and an electric field is further applied.
- the principle of this detector is that the recoil electrons bounced by the X-ray photons incident on the drift region 122c are drifted and captured by the MSGC 122b.
- Fig. 4 (b) only MSGC122b is shown, and the relationship between the anode and the power sword is also shown.
- Fig. 5 shows a side view of Fig. 4 (a), showing the relationship between the incidence of X-ray photons and recoil electrons.
- the X-ray photon incident from the right direction repels electrons inside the drift region 122c, and the recoil electrons reach the MSGC.
- the MSGC 122b is sequentially connected to a DAS 14, a preamplifier 15, and a discrimination circuit 162 for discriminating into projection data for each X-ray energy.
- the discrimination circuit 162 is a circuit that discriminates the energy of incident X-rays using a comparator, and is connected to a plurality of reconstruction processing units 402 and 403 that execute a reconstruction algorithm according to the identified X-ray energy. It is done.
- two reconstruction processing units 402 and 403 are connected to the discrimination circuit 162, but the number of connected reconstruction processing units is not limited to two, and projection data to be discriminated. It may be provided according to the number of types.
- the discrimination circuit 162 may be provided closer to the photon counting detector 122 than the DAS 14. In this case, the projection data output from the photon counting detector 122 is discriminated for each X-ray energy by the discrimination circuit 162, and the projection data for each discriminated X-ray energy is collected by the DAS 14. And amplified by the preamplifier 15.
- FIG. Fig. 6 shows an example of CT imaging of an ideal cylinder of uniform density (Fig. 6 (a)) with single energy X-rays.
- the projection data obtained at this time is directly proportional to the thickness of the material along the direction of the X-ray beam.
- the projection data has a single energy. It becomes smaller than the case of.
- Figure 6 (c) shows the relationship between ln (Io / l) (logarithmic ratio of incident X-ray and transmitted X-ray) and the thickness of the object.
- the X-ray becomes stiff, so draw a line that bends below the straight line, such as the dotted line.
- FIG. 7 is a schematic diagram for explaining a method of counting and reconstructing X-ray photons for each X-ray energy
- FIG. 7 (a) is a phototon when X-ray energy discrimination is performed.
- Fig. 7 (b) shows the image reconstructed according to the photon energy and energy intensity shown in Fig. 7 (a).
- an image with clear contrast (CT value difference) between bone and contrast tissue can be obtained.
- the contrast density (staining degree) of organs changes not only from moment to moment (change over time) but also from subject to subject (individual difference).
- the tendency is different from when the organ is imaged with 13 mgl.
- Fig. 8 (b) when the projection data taken at 140 kv is discriminated into projection data of about 80 kv or less and reconstructed, there is almost no difference in CT values between the bone and the contrasted organ.
- a CT value difference of about 50 is attached to the bone and contrasted organ.
- a desired reconstructed image can be efficiently obtained by photographing at a higher tube voltage and creating an image in an arbitrary energy range as necessary.
- X-ray color CT based on energy discrimination of X-ray quanta is a CT device that improves the image quality by removing the body tongue LX rays, identifies lesions based on differences in different energy images, and improves the sensitivity of contrast agents.
- This is a basic technology that will be a next-generation X-ray CT system.
- MSGC has a very high counting rate and can withstand the high-intensity X-rays required for human CT systems.
- the present invention by replacing the charge collecting plate electrode of the currently used X-ray CT apparatus with the above-mentioned MSGC, it is possible to use conventional Zenon with a slight change from the conventional X-ray CT technology. It is possible to obtain a quantum image that measures the number of X-ray quanta that can be achieved by improving the image quality of the X-ray CT device, and to suppress the image noise to the quantum noise limit, and at the same time to realize an X-ray color CT device by energy discrimination. it can.
- the second embodiment is an X-ray CT apparatus in which an energy discrimination detector (first X-ray detector) and an energy non-discrimination detector (second X-ray detector) are stacked.
- the X-ray CT apparatus according to the present embodiment is displayed using the projection data output from the points where the two types of X-ray detectors are stacked and the projection data output from each X-ray detector.
- First implementation with images Although different from the form, the other configurations are the same as those of the first embodiment.
- FIG. 9 is a block diagram for showing the flow of projection data and a reconstructed image in the X-ray CT apparatus according to the present embodiment.
- the detector 12 detects continuous X-rays including a plurality of X-ray energies irradiated by the X-ray source in a state where X-ray energies are mixed without discrimination for each X-ray energy.
- a photon counting detector is used as the first X-ray detector
- a photon non-counting detector is used as the second X-ray detector.
- a plurality of DASs 14 and preamplifiers 15 are provided for each of the first X-ray detector and the second X-ray detector.
- the detector 12 is configured by laminating a photon counting detector 122 on a photon non-counting detector 121.
- the photon non-counting detector 121 includes an ionization chamber detector that uses the ionizing action of X-rays and a solid-state detector that uses the fluorescence characteristics of X-rays. In this embodiment, a solid-state detector is used.
- the solid state detector 121 includes a separator 121a, a scintillator 121b, and a photodiode 121c. Separator 121a is provided between each channel to remove scattered X-rays. When X-rays enter the scintillation evening 121b, it emits light called scintillation evening light, and the photodiode 121c detects the scintillation evening light and converts it into an electrical signal. The DAS 141 converts this electrical signal into a digital value and detects the intensity of the incident X-ray.
- the projection data output from the DAS 1 41 is amplified by the preamplifier 151 and input to the reconstruction processing unit 401 in the image processing apparatus 20.
- the photon counting detector 122 includes a drift electrode 122a, an MSGC 122b provided at a predetermined distance, and a drift region 122c configured by enclosing a gas between the drift electrode 122a and the MSGC 122b.
- the MSGC 122b is sequentially connected to a DAS 142, a preamplifier 152, and a discrimination circuit 162 for discriminating into projection data for each X-ray energy.
- a plurality of discrimination circuits 162 are connected to reconstruction processing units 402 and 403 that execute a reconstruction algorithm according to the X-ray energy to be discriminated.
- two reconstruction processing units 402 and 403 are connected to the discrimination circuit 162.
- the number of connected reconstruction processing units is not limited to two, and the projection data to be discriminated is distinguished. Depending on the number of different types of data,
- the discrimination circuit 162 may be provided closer to the photon counting detector 122 than the DAS 142. In this case, the projection data output from the photon counting detector 122 is discriminated for each X-ray energy by the discrimination circuit 162, and the projection data for each discriminated X-ray energy is collected by the DAS 142. And amplified by the preamplifier 152.
- Reconstructed images generated by the reconstruction processing units 401, 402, and 403 may be individually displayed on the image display device 30.
- the reconstruction processing unit 401 Any combination of the reconstructed images generated in 402 and 403 may be combined, and the combined reconstructed image may be displayed on the image display device 30.
- the energy-reconstructed reconstructed image generated by the reconstructing processing units 402 and 403 may be a blurred image depending on shooting conditions or the like. Therefore, the efficiency may be deteriorated when image diagnosis is performed using only the reconstructed images generated by the reconstruction processing units 402 and 403. In such a case, by identifying the energy-reconstructed reconstructed image generated by the reconstruction processing units 402 and 403 and the reconstructed image generated by the reconstruction processing unit 401, it is possible to identify abnormal sites, etc. It is possible to obtain an image that can easily identify an organ or the like while taking advantage of the reconstructed image that is useful for energy discrimination.
- the photon counting detector 122 using the MSGC is mounted on the solid detector 121.
- X-ray photons that have passed through the human body, etc. are detected by photon counting detectors at the front stage, and photon detection is performed based on this data, and image reconstruction for each energy is performed in the reconstruction processing units 402 and 403. Is implemented.
- the subsequent solid-state detector 121 measures X-ray photons that are not detected by the front-stage photon counting detector 122, and uses them to obtain a normal reconstructed image.
- the photon counting detector 122 in the front stage detects most of the X-ray photons that have passed through the human body etc.
- the X-ray detected by the solid detector 121 in the rear stage will be reduced and clinically effective.
- a reconstructed image cannot be obtained.
- the photon detector in the previous stage need only detect photons that can reconstruct an image with each energy. In other words, it can be realized by controlling the photon detection ability of MSGC in unit time and detecting most of the transmitted X-rays with the solid state detector 121.
- the performance of the MSGC for example, the detection efficiency of recoil electrons can be improved by changing the gas pressure enclosed in the draft region 122c.
- the multistage configuration of the solid state detector 121 and the photon counting type detector is shown.
- the drift electrode substrate of the photon counting type detector 122 and the MSGC may be substituted for the separator of the solid state detector 121. In this case, it is not necessary to mount the separator of the solid state detector 121.
- the solid state detector 121 and the photon counting detector 122 using the MSGC have been described.
- other X-ray photon non-counting detectors and X-ray photon counting detectors are used.
- the effect of the present invention is not changed even by the combination.
- an ionization chamber detector and a semiconductor detector such as CdTe (ternole power Dominium) can also exert the effect of the present invention.
- an X-ray CT apparatus equipped with an X-ray detector using MSGC, which is an X-ray photon counting detector, and a detector having a multi-stage configuration of an X-ray photon non-counting detector is used.
- MSGC which is an X-ray photon counting detector
- a detector having a multi-stage configuration of an X-ray photon non-counting detector is used.
- both energy-resolved CT images and normal CT images can be obtained, and clinically effective information can be provided to medical staff.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Biophysics (AREA)
- Public Health (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Pathology (AREA)
- Radiology & Medical Imaging (AREA)
- General Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Pulmonology (AREA)
- Theoretical Computer Science (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Measurement Of Radiation (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008512002A JPWO2007122882A1 (ja) | 2006-04-24 | 2007-03-08 | X線ct装置 |
US12/298,115 US20090304141A1 (en) | 2006-04-24 | 2007-03-08 | X-Ray CT Apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006119398 | 2006-04-24 | ||
JP2006-119398 | 2006-04-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007122882A1 true WO2007122882A1 (ja) | 2007-11-01 |
Family
ID=38624796
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/054520 WO2007122882A1 (ja) | 2006-04-24 | 2007-03-08 | X線ct装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20090304141A1 (ja) |
JP (1) | JPWO2007122882A1 (ja) |
WO (1) | WO2007122882A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009201885A (ja) * | 2008-02-29 | 2009-09-10 | Ge Medical Systems Global Technology Co Llc | X線ct装置 |
JP2013007585A (ja) * | 2011-06-22 | 2013-01-10 | Toshiba Corp | 陽電子放出コンピュータ断層撮影装置及びX線CT(ComputedTomography)装置 |
JP2015033582A (ja) * | 2013-08-07 | 2015-02-19 | ザ・ユニバーシティー・オブ・シカゴ | X線コンピュータ断層撮像装置及び医用画像処理プログラム |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017192554A1 (en) * | 2016-05-02 | 2017-11-09 | Daniel Gagnon | Method and apparatus for performing co-planar and simultaneous spectral ct and pet imaging |
US10973473B2 (en) * | 2017-06-27 | 2021-04-13 | Canon Medical Systems Corporation | X-ray diagnostic apparatus |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6195268A (ja) * | 1984-10-17 | 1986-05-14 | Hitachi Medical Corp | X線ct装置 |
JPH04263842A (ja) * | 1991-02-19 | 1992-09-18 | Hitachi Medical Corp | Dexa機能を持つct装置 |
-
2007
- 2007-03-08 WO PCT/JP2007/054520 patent/WO2007122882A1/ja active Application Filing
- 2007-03-08 JP JP2008512002A patent/JPWO2007122882A1/ja active Pending
- 2007-03-08 US US12/298,115 patent/US20090304141A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6195268A (ja) * | 1984-10-17 | 1986-05-14 | Hitachi Medical Corp | X線ct装置 |
JPH04263842A (ja) * | 1991-02-19 | 1992-09-18 | Hitachi Medical Corp | Dexa機能を持つct装置 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009201885A (ja) * | 2008-02-29 | 2009-09-10 | Ge Medical Systems Global Technology Co Llc | X線ct装置 |
JP2013007585A (ja) * | 2011-06-22 | 2013-01-10 | Toshiba Corp | 陽電子放出コンピュータ断層撮影装置及びX線CT(ComputedTomography)装置 |
JP2015033582A (ja) * | 2013-08-07 | 2015-02-19 | ザ・ユニバーシティー・オブ・シカゴ | X線コンピュータ断層撮像装置及び医用画像処理プログラム |
Also Published As
Publication number | Publication date |
---|---|
US20090304141A1 (en) | 2009-12-10 |
JPWO2007122882A1 (ja) | 2009-09-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Taguchi | Energy-sensitive photon counting detector-based X-ray computed tomography | |
US7263167B2 (en) | Direct conversion X-ray detector with over-range and pile-up correction | |
JP6200428B2 (ja) | X線検出器、x線装置、プロセッサ、コンピュータプログラム、及びその関連方法 | |
US6448545B1 (en) | Precision endoscopic imaging system | |
US6316773B1 (en) | Multi-density and multi-atomic number detector media with gas electron multiplier for imaging applications | |
EP2419759B1 (en) | Spectral imaging | |
Kappler et al. | Multi-energy performance of a research prototype CT scanner with small-pixel counting detector | |
US8373135B2 (en) | Counting detector and computed tomography system | |
US7466793B2 (en) | Distinct incident energy spectra detection | |
CN110383108B (zh) | 基于光子计数的x射线探测器系统 | |
JP2020507753A (ja) | 一致を可能にする光子計数検出器 | |
US20100282972A1 (en) | Indirect radiation detector | |
JP2006101926A (ja) | 放射線検出装置、放射線画像診断装置、及び放射線画像の生成方法 | |
JPS62290443A (ja) | 動静電荷検出装置で2種エネルギ差像を求める装置及び方法 | |
JP2011252855A (ja) | 核医学イメージング装置 | |
KR20160089976A (ko) | 엑스선 영상장치 및 엑스선 영상생성방법 | |
Cho et al. | Characteristic performance evaluation of a photon counting Si strip detector for low dose spectral breast CT imaging | |
WO2007122882A1 (ja) | X線ct装置 | |
WO2015016205A1 (ja) | 低エネルギx線画像形成装置及びその画像の形成方法 | |
KR20060036081A (ko) | 토모신디사이즈를 위한 스캐닝 기반의 전리 방사선 검출 | |
EP1687616B1 (en) | Examination method and apparatus | |
JP2004508544A (ja) | 撮像のための電子増倍管を備えた多密度多原子番号検出器媒体 | |
JP2006284472A (ja) | 放射線診断装置及び放射線検出装置 | |
Zhao et al. | Characterization of a direct full-field flat-panel digital mammography detector | |
JPWO2008010512A1 (ja) | X線ct装置及び画像ノイズ低減方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 07738011 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2008512002 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 07738011 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12298115 Country of ref document: US |