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Flat-field correction method and system of CCD DR detector

A flat-field correction and detector technology, applied in the field of digital medical image processing, can solve problems such as inability to correct defects on fluorescent screens, and achieve the effect of reducing influence and avoiding defects

Inactive Publication Date: 2016-06-01
SHENZHEN ANGELL TECH
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a flat-field correction method and system for a CCDDR detector, aiming at solving the problem in the prior art that defects cannot be corrected but new defects will be introduced when the phosphor screen moves

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[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0055] From the shortcomings of the traditional correction method, it can be seen that when the fluorescent screen shifts, the reason for new defects is that the defect compensation is performed on the normal area. If the corresponding defect compensation coefficient is filtered out, the normal area will not be corrected even if it is shifted. Compensation, the result is that there is no way to correct the defects of the fluorescent screen, but it is still effective for other uneven factors of the system, and the important thing is that no new defects will be introduced. Before performing flat-fiel...

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Abstract

The present invention is applicable to digital medical image processing provides a flat-field correction method of a CCD DR detector. The method comprises the steps of (A) controlling the CCD DR detector to collect a plurality of air images with the same dose to carry out average processing, and obtaining a mean air image, (B) carrying out mean filtering on the gray value of each pixel in the mean air image and obtaining a corresponding gray filtering value, then comparing and replacing the gray value and the gray filtering value, and obtaining a filtering air image, (C) carrying out calculating according to the gray mean value in the filtering air image and the gray value of each pixel and obtaining the correction coefficient corresponding to each pixel, and (D) collecting the images of a patient, multiplying each pixel in the collected image by a corresponding correction coefficient, and obtaining a patient image. According to the method, while various non-uniform factors of a system is corrected, the defect due to fluorescent screen offset introduction is avoided, and the influence of the defect on diagnosis is reduced.

Description

technical field [0001] The invention belongs to the field of digital medical image processing, in particular to a flat-field correction method and system for a CCDDR detector. Background technique [0002] The CCD-based X-ray digital imaging system (DR, Digital Radiography) uses a fluorescent screen to convert X-rays into visible light, and then focuses the light to the CCD sensor through the lens, and the CCD converts visible light into electrical signals and outputs them digitally. Due to factors such as uneven distribution of X-rays on the imaging plane, uneven conversion or defects of the fluorescent screen, uneven transmittance of the lens, and uneven response of each pixel of the CCD, the final image is uneven. Generally, flat-field correction is used to reduce the influence of this unevenness, so that the system's response to X-rays tends to be uniform. The traditional flat-field correction needs to calculate the correction coefficient when the system is installed, a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/50
CPCG06T5/005G06T5/50G06T2207/10004G06T2207/20216
Inventor 叶超孙凯
Owner SHENZHEN ANGELL TECH
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