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CT image reconstruction method and system

A CT image and image technology, applied in the field of digital image processing and pattern recognition, can solve problems such as waste, not caring about background reconstruction, slow algorithm reconstruction speed, etc., and achieve the effect of improving reconstruction speed

Inactive Publication Date: 2009-04-08
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Although these two algorithms have been optimized to a certain extent, because they waste a large part of the time on the background data when performing back-projection calculations, and generally users do not care about the reconstruction of the background, resulting in the inconsistency of the two algorithms. Rebuilds are relatively slow

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  • CT image reconstruction method and system
  • CT image reconstruction method and system

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Embodiment Construction

[0021] In the embodiment of the present invention, the step of identifying valid data boundaries is added before the 3-step reconstruction of CT images, that is, as a preprocessing of projection data, and then only the valid data within the boundaries are reconstructed, ensuring that the reconstructed image quality is not Under the premise of changing, the reconstruction speed has been improved.

[0022] The research on the FBP and FDK algorithms shows that the time consumed by the back-projection reconstruction part accounts for more than 98% of the entire reconstruction time. It can be seen that the most effective way to improve the CT reconstruction speed is to reduce the time consumed by the back-projection reconstruction part, which can be achieved by reducing the amount of back-projection data.

[0023] In order to meet most requirements, the detector size of CT is generally much larger than the size of the target object. In this way, the detector collects a large amoun...

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Abstract

The invention discloses a CT image reconstruction method. The method comprises: an effective data boundary of an image is identified, the minimum value and the maximum value of the obtained effective data boundary point line (row) numbers are obtained, data weighting is carried out on the image, a fan-shaped beam is corrected to be a corresponding parallel beam, artifacts in the image are eliminated by convolution filtration, and back projection reconstruction is carried out by utilizing the minimum value and the maximum value of the line (row) numbers. The invention also discloses a CT image reconstruction device comprising a boundary identification module, a data weighting module, a filtration module and a reconstruction module. The CT image reconstruction method and the device improve the reconstruction speed under the premise of ensuring the unchanged quality of the reconstructed image by identifying the effective data boundary before the CT image reconstruction and only reconstructing effective data in the boundary after the CT image reconstruction.

Description

technical field [0001] The invention relates to the fields of digital image processing and pattern recognition, in particular to a method and system for CT image reconstruction. Background technique [0002] As a non-contact non-destructive detection technology, CT (Computed Tomography) has been widely used in medical, industrial non-destructive detection and related military fields in recent years. Through CT tomography or 3D reconstruction, we can obtain various information such as the size, shape, and dimension of the target object. Real-time CT tomography or 3D image reconstruction will occupy an increasingly important position in medical fields such as intracranial surgery or heart surgery, as well as related military fields. In addition to scanning speed, another key factor affecting real-time CT image reconstruction is reconstruction speed. [0003] At present, the most widely used reconstruction algorithms in the field of CT 2D and 3D reconstruction are FBP algorit...

Claims

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Application Information

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IPC IPC(8): G06T11/00G06T7/00G06T7/13
Inventor 骆清铭刘谦毕昆高源
Owner HUAZHONG UNIV OF SCI & TECH
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