CT imaging system and method
A CT imaging and CT scanning technology, applied in the field of radiation imaging, can solve the problems of affecting the ability to distinguish substances, failing to reflect material attenuation information, and systematic errors in imaging results, etc.
Active Publication Date: 2016-04-20
NUCTECH CO LTD +1
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Since the energy deposition is an energy-weighted integration of the X-ray energy spectrum, the imaging result cannot reflect the attenuation information of the material at a certain energy
[0003] Dual-energy imaging includes multi-energy CT using different X-ray energy spectra for imaging, which has a certain ability to distinguish substances, but due to the limitation of its physical model, the imaging results have certain systematic errors, and there is always a certain overlap between X-ray energy spectra region, which affects the ability to discriminate between substances
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[0013] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.
[0014] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...
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A CT imaging system and method are disclosed. An ordinary CT scan is performed on the object to obtain an ordinary CT image, and then the region of interest is determined from the image. A CT scan of the region of interest is performed at multiple energy windows using a photon counting detector. A high-resolution image of the region of interest is then reconstructed. The photon counting detectors are used to collect photon counting projection data of multiple energy windows, so multiple basis functions can be decomposed, resulting in high energy spectrum discrimination and good numerical stability.
Description
technical field [0001] Embodiments of the present invention relate to radiation imaging, and in particular to a CT imaging system and method. Background technique [0002] Traditional single-energy and dual-energy X-ray imaging usually use scintillator-type detectors, and the collected signals reflect the overall energy deposition of polychromatic X-rays. Since the energy deposition is an energy-weighted integration of the X-ray energy spectrum, the imaging result cannot reflect the attenuation information of the material at a certain energy. [0003] Dual-energy imaging includes multi-energy CT using different X-ray energy spectra for imaging, which has a certain ability to distinguish substances, but due to the limitation of its physical model, the imaging results have certain systematic errors, and there is always a certain overlap between X-ray energy spectra area, which affects the material discrimination ability. Contents of the invention [0004] Aiming at the tec...
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IPC IPC(8): G01N23/04G01V5/00A61B6/03
CPCG01N23/046G01T1/2985A61B6/032A61B6/4241A61B6/4266G01N2223/419A61B6/482A61B6/5205G06T11/005G06T5/50G06T2207/10081G06T2207/20182
Inventor 沈乐邢宇翔李元吉冯初晴张丽陈志强
Owner NUCTECH CO LTD