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Method for reestablishment based on double-source, double-spiral and multi-layered spiral CT

A double-helix and helix technology, applied in the field of reconstruction based on dual-source double-helix multi-slice CT, can solve the problems of low quality of reconstructed images, large errors in reconstruction results, and no improvement in the resolution of reconstructed images, so as to achieve improved resolution rate, high-resolution effects

Inactive Publication Date: 2006-03-29
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The Z-axis interpolation algorithm of multi-layer fan beam projection data requires a small cone angle, otherwise, the error of the reconstruction result will be unacceptably large
Compared with single-source single-helical multi-slice CT, single-source single-helical multi-slice CT has the advantages of large Z-axis coverage, fast data acquisition speed, and high imaging accuracy, but there may be low quality of reconstructed images and resolution of reconstructed images rate has not been improved

Method used

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  • Method for reestablishment based on double-source, double-spiral and multi-layered spiral CT
  • Method for reestablishment based on double-source, double-spiral and multi-layered spiral CT
  • Method for reestablishment based on double-source, double-spiral and multi-layered spiral CT

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[0026] In order to better understand the technical solution of the present invention, the following will be further described in conjunction with the accompanying drawings and specific embodiments, and the embodiments are implemented according to the following steps:

[0027] (1) Place the anesthetized living mouse on a bed that can perform uniform linear motion along the Z-axis direction. The first X-ray source emits cone beam X-rays at one point. After passing through the live mouse, the attenuated X-rays are transmitted to the opposite side The first 4 rows of detectors are detected, and each row of detectors is arc-shaped. The first 4 rows of detectors are stacked along the Z-axis in the corresponding single-source single-helical single-slice CT. The detectors are distributed symmetrically about the plane perpendicular to the Z axis where the emission source is located. In the triangle formed by each row of detectors and the emission source, the included angle between the ...

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Abstract

A 3D image reconstructing method based on dual-source dual-spiral multi-layer spiral CT features that two x-ray sources, two structures of multi-row detectors and two spiral scan paths are used to increase the projection data acquisition speed. It includes such steps as calculating the projection data needed by reconstructing a planar image perpendicular to Z axis by using interpolation algorithm of the multi-layer projection data on two paths, reconstructing the planar image by 2D filter-reverse projection algorithm, and reconstructing a 3D image with a series of said planar images.

Description

technical field [0001] The invention relates to a method in the technical field of biomedical imaging, in particular to a reconstruction method based on dual-source double-helix multi-slice CT. Background technique [0002] The working process of single-source single-helical single-slice CT is as follows: the X-ray tube emits cone-beam X-rays at one point, and after passing through the object to be measured, the attenuated X-rays are detected by the single-row detector on the opposite side (single-row The detector is on the same plane as the X-ray source), and the X-rays are converted into electrical signals, sent to the computer's analog-to-digital converter and data collector, converted into digital signals and stored in the computer. This is just one exposure and acquisition process. In order to obtain the projection data needed to reconstruct the object under test, the X-ray source and the single-row detector need to move along a spiral trajectory relative to the object ...

Claims

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Application Information

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IPC IPC(8): A61B6/02A61B6/03
Inventor 赵俊刘尊钢庄天戈
Owner SHANGHAI JIAO TONG UNIV
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