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Blocked scan rebuilding and space assembly method of large object image-forming with cone-beam CT

A block scanning, large object technology, used in the field of medical instruments

Inactive Publication Date: 2008-03-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The result obtained by this approach is to solve the practical problem of volumetric imaging of large objects with cone-beam CT in some less demanding situations

Method used

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  • Blocked scan rebuilding and space assembly method of large object image-forming with cone-beam CT
  • Blocked scan rebuilding and space assembly method of large object image-forming with cone-beam CT
  • Blocked scan rebuilding and space assembly method of large object image-forming with cone-beam CT

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Experimental program
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Effect test

specific Embodiment 1

[0070] Specific embodiment 1: the block local reconstruction of Shepp-Logan mould, as shown in Figure 10:

[0071] Step 1. Divide the Shepp-Logan mold into 5 blocks, as shown in Figure 5;

[0072] Step 2. Place each block area of ​​the Shepp-Logan mold in the scanning field of view of cone beam CT, that is, the rotation center area of ​​the turntable, and place each block area in sequence in the scanning field of cone beam CT by using the method of spatial translation field of view;

[0073] Step 3: Cone beam scanning is performed on each partition of the Shepp-Logan mold to obtain cone beam projection images. A full scan acquires about 300 projection images. Half scans acquire about 160 images.

[0074] Step 4, filling the truncated area of ​​the projected image, as shown in Figure 2;

[0075] Step 5. Use the FDK method or the convolutional back-projection method to perform 3D volume reconstruction. In this embodiment, the convolutional back-projection method is used to r...

specific Embodiment 2

[0078] Specific embodiment 2: filling the data of the projected truncated image of the breast mold;

[0079] Figure 8(a) Cone beam projection image without transverse truncation of the breast mold; Figure 8(b) Transverse truncated projection image caused by adjusting the ray collimator; Figure 8(c) Transverse truncated projection after boundary extension filling image.

[0080] Figure 9 is the local reconstruction image of the breast mold; the first row shows the local reconstruction of the transverse truncated projection without filling (see Figure 8(b)), and the Gibbs effect caused by the boundary truncation can be seen, that is, the reconstruction Very bright edges in the image; the second row shows the local reconstruction after filling the laterally truncated projection (see Fig. 8(c)), where the Gibbs effect is reduced and the reconstruction performance is improved near the border .

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Abstract

The method comprises: making the partitioning scan for a large object; after making an edge fill-up for the across direction cutting-off projected picture, then combining the reconstructed image blocks to get a 3D fault volume image.

Description

technical field [0001] The invention belongs to the technical field of medical instruments, in particular to a block scanning reconstruction and space assembling method for large object imaging by cone beam CT. Background technique [0002] Currently, CT scanning with cone beams is moving from scientific research to product development. Varian Medical Systems of the United States specializes in the production of flat panel detectors for cone beam CT. The best-selling flat panel detector panel in the market is Paxscan4030CB. Many universities and companies in the United States are researching cone beam CT systems, such as the University of Rochester, the University of California, Davis, Duke University, and Philips Medical Systems in Cleveland. Their R&D focuses on algorithm and system development, and local volume reconstruction of cone-beam helical scanning with PI-line reconstruction theory, and does not involve tomographic imaging of large objects with cone-beam CT. The...

Claims

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Application Information

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IPC IPC(8): G01N23/04G06T1/00
Inventor 陈自宽
Owner NORTHEASTERN UNIV
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