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Compression method for CT image

A technology of CT image and compression method, applied in the direction of image communication, electrical components, etc., can solve the problems of waste, large storage space, etc.

Inactive Publication Date: 2008-02-13
SIEMENS SHANGHAI MEDICAL EQUIP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, a lot of storage space needs to be wasted to repeatedly store the same image

Method used

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  • Compression method for CT image
  • Compression method for CT image
  • Compression method for CT image

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Referring to Fig. 3, the main idea of ​​the compression method of CT image of the present invention is:

[0017] Step 10: cutting the CT image matrix into several sub-matrices;

[0018] Step 20: Each sub-matrix uses a flag (Flag) to record its state, and each flag has only two states of 0 or 1. Among the above-mentioned several sub-matrices, the sub-matrix whose pixel values ​​are all zero (hereinafter referred to as zero sub-matrix) matrix) is set to 0, and the sub-matrix whose pixel values ​​are not all zero (hereinafter referred to as non-zero sub-matrix) is set to 1;

[0019] Step 30: judge whether the sub-matrix marked as 1 is composed of a single pixel, if not, repeat steps 10 and 20 to cut the sub-matrix marked as 1 into several sub-matrices of the next level (Level) and zero The flag of the sub-matrix is ​​set to 0, and the flag of the non-zero sub-matrix is ​​set to 1, and then the judgment of this step is performed; if yes, the next step is performed:

[002...

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Abstract

The present invention proposes a method for compressing CT images. The CT image is the difference image between the first CT image in a series of images and the subsequent CT images. It includes a matrix formed by several pixels, and the matrix is ​​cut be several sub-matrices; set the sign of the zero sub-matrix to 0, and set the sign of the non-zero sub-matrix to 1; judge whether the sub-matrix whose sign is 1 is made up of a single pixel, if not, repeat the preceding steps to set the sign to The sub-matrix that is 1 is cut into several sub-matrices of the next level and the flag of the zero sub-matrix is ​​set to 0, and the flag of the non-zero sub-matrix is ​​set to 1, and then the judgment of this step is performed; Individual pixel values ​​and the flags. This method uses the same storage space as the existing method for storing the value of a single pixel, but the storage space used for storing the mark is less than that for storing the coordinates of the single pixel, thus saving the total storage space.

Description

technical field [0001] The invention relates to a storage technology of CT images, in particular to a compression method of CT images. Background technique [0002] In some computerized tomography (CT) interventional procedures (Interventional Procedures), it is necessary to scan 6 to 8 frames of images per second and display the images in real time on a monitor. Referring to Figure 1, the resolution of a CT image is usually 512*512, and the value of each pixel (Pixel) is usually 0 to 4096, which requires 12 bytes (Byte) to store a pixel, so 512*512*12 = 3145728 bytes to store an image. However, in such a short period of time, the system cannot display and store such a large amount of information at the same time, so these images will be directly written into OpenGL's screen image cache instead of being stored. This allows doctors to observe these images only during the scanning process, but cannot call these images in subsequent diagnosis because they cannot be stored, or...

Claims

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Application Information

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IPC IPC(8): H04N1/41
Inventor 曹斌
Owner SIEMENS SHANGHAI MEDICAL EQUIP LTD