Moore stripe recognition method and device for X-ray grating phase-contrast imaging
A technology of phase contrast imaging and moiré fringes, which is applied in image enhancement, image analysis, image data processing, etc., can solve the problems of unguaranteed accuracy and slow speed, achieve accuracy assurance, increase instrument adjustment speed, and avoid errors Effect
Active Publication Date: 2015-04-08
UNIV OF SCI & TECH OF CHINA
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However, in the current X-ray grating phase-contrast imaging experiments, the angle and period of moiré fringes are judged by the naked eye. The disadvantage is that it has personal subjective consciousness, the accuracy cannot be guaranteed, and the speed is slow. See reference [4]
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[0029] 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 specific embodiments and with reference to the accompanying drawings.
[0030] The principle of moiré fringe generation is as follows: from the Talbot effect, it can be known that the phase grating generates grating self-image at the Talbot distance, we place the analysis grating at a specific Talbot distance, the fringes of the two intersect to form moiré fringes, and place it behind the analysis grating The original image is received by the CCD detector.
[0031] figure 1 The composition of the X-ray grating step phase contrast imaging system is shown. Such as figure 1 As shown, the system is X-ray source, source grating, test sample, phase grating, analysis grating and CCD detector from right to left.
[0032] figure 2 Several typical relative positions of the analytical and phase gra...
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The invention discloses a Moore stripe recognition method and device for X-ray grating phase-contrast imaging. The method includes the steps of 1, subjecting a Moore stripe image to be recognized to illumination unevenness correction; 2, filtering the Moore stripe image subjected to illumination unevenness correction; 3, binarizing the Moore stripe image filtered to obtain a binary image; 4, detailing the binary image to extract center lines of Moore stripes in the binary image; and 5, recognizing precision positions of the Moore stripes according to the extracted center lines of the Moore stripes. The Moore stripe recognition method and device has the advantages that calculation of the angle and direction of Moore stripes is automated, errors caused by subjective factors of an instrument user are avoided, instrument adjusting speed is greatly increased, and precision is well guaranteed.
Description
technical field [0001] The invention relates to an automatic detection method for the angle and period of a fringe image, in particular to an automatic identification method for the angle and period of a Moiré fringe in the alignment process of an X-ray grating phase contrast imaging device. Background technique [0002] For more than 100 years since the German scientist Roentgen first discovered X-rays in 1895, X-rays have been widely used in the field of imaging objects because of their strong penetrating ability. Traditional X-ray imaging methods are mainly based on the absorption of X-rays by objects, and the quality of the final imaging contrast largely depends on the difference in X-ray absorption characteristics of various parts inside the object. In the medical field, since the soft tissue part of the human body has little absorption of X-rays, this means that the application of X-ray absorption imaging methods to the diagnosis of soft tissue lesions in the human bod...
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Login to View More IPC IPC(8): G06T7/00G06T5/00
CPCG06T7/70G06T2207/10116
Inventor 吴自玉韩华杰王圣浩张灿杨萌王志立高昆
Owner UNIV OF SCI & TECH OF CHINA