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Image reconstruction method in double-line or multi-line helical CT

A multi-row spiral, image technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of reducing the longitudinal resolution and the width of the layer sensitivity response curve, and achieve the effect of increasing the longitudinal resolution and improving the width.

Active Publication Date: 2009-08-05
SHENZHEN ANKE HIGH TECH CO LTD
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Problems solved by technology

However, due to this multi-slice spiral CT imaging system, the slice sensitivity response curve corresponding to the two-point linear interpolation method utilized is relatively wide, thus reducing the longitudinal resolution

Method used

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  • Image reconstruction method in double-line or multi-line helical CT
  • Image reconstruction method in double-line or multi-line helical CT
  • Image reconstruction method in double-line or multi-line helical CT

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Embodiment Construction

[0038] Hereinafter, a preferred embodiment of the present invention will be described in detail.

[0039] The image reconstruction method in a double-row or multi-row spiral CT of the present invention designs a method for nonlinear interpolation between two points, so as to generate an intermediate sampling position located within the filter width range corresponding to the target reconstruction position. on the data. The technical implementation scheme for calculating the interpolation weight of the detector data in the present invention is as follows: firstly, the first weight coefficient of the detector data is calculated by using a linear interpolation method. All detector data within the same set of fan beam projections have the same value for this coefficient. Then, according to the ray source rotation angle β where the detector data is located, and the angle α between the line from the ray source to the detector and the line from the ray source to the rotation center ...

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Abstract

An image reconstruction method in a double-row or multi-row spiral CT of the present invention comprises the following steps: correcting the original data from the detector; generating data at the reconstruction position, and collecting data before and after the reconstruction position Carry out longitudinal interpolation to approximate the data at the reconstruction position; carry out rearrangement process to convert fan beam projection into parallel projection; filter the rearranged data; back-project the filtered data to generate CT images. The present invention not only considers the distance between the detector and the sampling plane when using the two-point interpolation method to calculate the data at the intermediate sampling position, but also considers the position factor of the detector in the projection, so that the distance between the intermediate The weight of the projection data near the sampling position is reduced, and the weight of the projection data far away from the middle sampling position is reduced, thereby improving the width of the layer sensitivity response curve and increasing the vertical resolution.

Description

technical field [0001] The present invention relates to an image reconstruction method in double-slice or even multi-slice spiral CT, in particular to a method for applying a two-point nonlinear interpolation method in the longitudinal direction to generate reconstruction data at the reconstruction position. This method can be applied to In the dual-slice or multi-slice spiral CT of the extended high-resolution reconstruction method, it is used for generating reconstruction data at the reconstruction position. Background technique [0002] With the development of electronic technology, CT equipment that can image without dissecting the human body has appeared in medical equipment. The principle of CT equipment is that when a high-speed electron stream hits metal, it will generate X-rays, which can penetrate human tissue, thereby producing a transmission effect. However, during the transmission of X-rays, different tissues absorb the rays in different degrees. For example, b...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03G06T1/00
Inventor 孙文武陈思平葛遗林
Owner SHENZHEN ANKE HIGH TECH CO LTD
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