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Partial-scan-based CT image reconstruction method, apparatus and CT device

A CT image and image reconstruction technology, applied in image data processing, 2D image generation, computer tomography scanner, etc., can solve the problems of inability to realize parallel processing of projection data, low system efficiency, and large time consumption

Active Publication Date: 2014-11-26
联影(常州)医疗科技有限公司
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Problems solved by technology

[0019] The processing steps of de-redundancy and merging of data need to be completed after all the original projection data are detected and acquired. Therefore, in the time-consuming process of reconstructing images based on projection data, the parallelism of projection data cannot be realized. processing, causing the system to be in a waiting state for a long time, and the system efficiency is very low

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  • Partial-scan-based CT image reconstruction method, apparatus and CT device
  • Partial-scan-based CT image reconstruction method, apparatus and CT device
  • Partial-scan-based CT image reconstruction method, apparatus and CT device

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Embodiment Construction

[0062] In this embodiment, the inventor provides a CT image reconstruction method based on partial scanning, which is different from the prior art. It is based on the following ideas: different from the weighting and de-redundancy merging steps of projection data in the prior art, in order to realize the system For the parallel and real-time processing of data, this technical solution abandons the de-redundancy and merging steps of the prior art; and, in order to overcome the defect of the detector data defect that occurs in the rearrangement process of the system, the present invention provides a projection Data processing method for data expansion.

[0063] Based on the idea of ​​the above invention, this embodiment provides a Figure 5 The partial scan-based CT image reconstruction method shown includes:

[0064] Step S100, start the CT scan from the start scan angle until the end of the scan angle to end the CT scan to obtain raw data.

[0065] The scan angle range of th...

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Abstract

The invention relates to a partial-scan-based CT image reconstruction method, apparatus and CT device. The method comprises the following steps: CT scanning is started when a scanning angle is [beta]start, the CT scanning ends when the scanning angle is [beta]end, original data of the scanning angle which ranges from [beta]start to [beta]end can be obtained, first projection data can be obtained by weighing the original data, second projection data of the scanning angle which ranges from [beta]start-z to [beta]end+z are obtained according to extension of the first projection data, rearrangement data are obtained by rearranging the second projection data, and a CT reconstruction image is obtained by subjecting the rearrangement data to image reconstruction operation. According to the partial-scan-based CT image reconstruction method, apparatus and CT device, parallel processing of the projection data can be realized, and waiting time of a system can be reduced.

Description

technical field [0001] The invention relates to the field of CT imaging, in particular to a CT image reconstruction method, device and CT equipment based on partial scanning. Background technique [0002] In X-ray computed tomography (Computed Tomograghy, CT), in order to obtain high resolution and speed up scanning, partial scanning is often used. Partial scanning is between half-scanning and full-scanning, and has advantages when scanning moving organs or tissues (such as the heart): the scanning time of partial scanning is shorter, and the possibility of object movement during imaging is also small, thereby The impact of motion artifacts on imaging quality is reduced. [0003] The scan angle of the partial scan rotation is generally between 180° and 360°. Such as figure 1 As shown, it is an axial schematic diagram of exposing the region of interest T0 with the device 100 using the detector array 101 and the radiation source 102 in a set scanning range in CT partial sca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00A61B6/03
Inventor 何益平
Owner 联影(常州)医疗科技有限公司
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