Data recovery device and method for original CT projection data, and CT imaging system

A projection data and data restoration technology, applied in the field of X-ray imaging, can solve the problem that the reconstructed image quality cannot be effectively improved

Active Publication Date: 2017-06-30
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The traditional data compensation operations are all based on the interpolation within the detector column or the interpolation between the channels with the same opening angle between the columns, the quality of the reconstructed image can not be effectively improved, and it will be different for different scanned objects. exhibits good and bad characteristics

Method used

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  • Data recovery device and method for original CT projection data, and CT imaging system
  • Data recovery device and method for original CT projection data, and CT imaging system
  • Data recovery device and method for original CT projection data, and CT imaging system

Examples

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no. 1 example

[0022] figure 1 It is a flow chart of the data restoration method for original CT projection data provided by the first embodiment of the present invention. Those skilled in the art can understand that the above-mentioned original CT projection data can be, for example, projection data collected from a detector channel of a CT imaging system, or projection data that has undergone some preprocessing after collection, and the preprocessing can include: For example, offset (Offset) correction to remove dark current, reference (Reference) channel correction to remove the fluctuation of ray energy in each field of view, air (aircal) correction to remove the inhomogeneity of the initial energy of each channel, beam hardening correction to remove high and low energy rays The absorption rate is inconsistent, and the -In mathematical transformation makes the data theoretically become the meaning of summation, etc.

[0023] figure 2 is the original CT projection data acquired in an e...

no. 2 example

[0051] Figure 4 The flow chart of the data restoration method for original CT projection data provided by the second embodiment of the present invention, the second embodiment is similar to the first embodiment, the difference may be that in the second embodiment, the above-mentioned second processing can also compare steps S115 and matching line classification step S117.

[0052] Comparing step S115: comparing the data intensity at the data point corresponding to the texture direction information (such as direction line D1 and / or D2) matched with each matching line with the preset data intensity;

[0053] Matching line classification step S117: If the data intensity at the data point corresponding to the texture direction information matching any matching line is greater than or equal to the preset data intensity, then determine the corresponding matching line as the first matching line; otherwise , if the data intensity at the data point corresponding to the texture direct...

no. 3 example

[0058] Figure 5 It is a block diagram of a data restoration device for original CT projection data provided by the third embodiment of the present invention. Such as Figure 5 As shown, in the third embodiment of the present invention, the data restoration device for original CT projection data includes an area determination module 100 and at least one of a first processing module 200 and a second processing module 300 . in:

[0059] The area determining module 100 can be used to determine the area to be estimated and the credible area adjacent to the area to be estimated in the original CT projection data.

[0060] The first processing module 200 may include a data fitting unit 230 and a first estimation unit 250 . The data fitting unit 230 may be used to perform data fitting on the CT projection data of the credible region to obtain a spatial surface equation. The first estimating unit 250 can be used to re-estimate the CT projection data of the region to be estimated a...

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Abstract

The invention provides a data recovery method for original CT projection data. The data recovery method for the original CT projection data comprises determining a region to be estimated and a confidence region adjacent to the region to be estimated in the original CT projection data; and carrying out at least one of a first treatment and a second treatment. The first treatment comprises carrying out data fitting on the CT projection data in the confidence region in order to obtain a spatial curved surface equation; and reestimating the CT projection data of the region to be estimated in dependence on the spatial curved surface equation. The second treatment comprises obtaining a plurality of texture direction messages distributed in the confidence region in dependence on the CT projection data in the confidence region; determining one or more matched line in the region to be estimated in dependence on each texture direction message with each matched line passing through at least one data point to be estimated and being matched with at least one texture direction; and carrying out interpolation operation along the matched lines in order to reestimate the CT projection data in the region to be estimated.

Description

technical field [0001] The invention relates to the field of X-ray imaging, in particular to a data restoration method and device for original CT projection data, and a CT imaging system. Background technique [0002] In computed tomography (CT) medical imaging technology, the original data collected from the detector are arranged into a two-dimensional matrix with the detector channel as the horizontal axis and the scanning field of view as the vertical axis, which is used as the original CT projection for image reconstruction Data, also known as a sinogram, is essentially a superposition of curves formed by points on the image. For example, if the acquired CT projection data is reconstructed into an image with a size of 512*512, then any point on the image is a curved trajectory in the matrix of the original CT projection data, and the amplitude of the curved trajectory depends on The distance between the point and the center of rotation of the virtual acquisition, the gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/005G06T2207/10081G06T2207/20221G01T1/29A61B6/032A61B6/5205G06T11/005
Inventor 王学礼曹蹊渺
Owner GENERAL ELECTRIC CO
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