Image correction method, image correction device, medical image generation method and medical image generation device
An image correction and medical image technology, applied in the field of image processing, can solve problems such as large energy difference, deviation, and influence on the quality of reconstructed images, and achieve the effect of improving accuracy and reducing artifacts
Active Publication Date: 2016-03-02
SHANGHAI UNITED IMAGING HEALTHCARE
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The difference in energy distribution of X-rays makes the energy difference on the detector after being attenuated by the irradiated object will be very large, and finally the gray value of the projected image from different angles will vary greatly, and this energy difference will affect the reconstruction of the image. Quality has a more serious impact
[0003] The traditional method to solve the problem of uneven energy distribution of X-rays is to correct the gray value of the entire projected image. The gray value of the projected image changes drastically, which basically deviates from the range of the gray value imaged on the detector after the real X-ray passes through the object, that is, the projected image cannot truly reflect the details of the irradiated object
Moreover, after the projection image is corrected by this method, and then reconstructed according to the corrected projection image, artifacts may appear in the reconstructed medical image
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[0030] 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.
[0031] It can be seen from the background technology that the projected image is corrected by the existing correction method, and the corrected projected image cannot truly reflect the details of the illuminated object. The inventor noticed that when the gray value of the foreground area and the background area of the projected image differ greatly When correcting the gray value of the entire projected image, the background image will have an impact on the correction result, resulting in the foreground image in the corrected projected image not meeting the actual needs, so the inventor considers whether the foreground area of the projected image can be It is separated from the background area to reduce the influence of the background image on the correction res...
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The invention relates to an image correction method, an image correction device, a medical image generation method and a medical image generation device. The image correction method is used to correct the grey values of projected images at different projection angles in a medical imaging system, and comprises the steps of segmenting a projected image at a projection angle to obtain a foreground image corresponding to the projection angle, and adjusting the average grey value of the foreground image corresponding to the projection angle to be close to or equal to a benchmark threshold. According to the technical scheme of the invention, a foreground image truly reflecting the details of an illuminated object can be obtained, the situation in which the grey value of a projected image gravely deviates from the real grey value after correction by the existing correction method is avoided, and the accuracy of correction is improved.
Description
technical field [0001] The invention relates to the field of image processing, in particular to an image correction method and device, and a medical image generation method and device. Background technique [0002] In a traditional breast tomography system, under the same kV (tube voltage of the ray source) and mAs (output power of the ray source), different ray sources are photographed at different angles, and the same ray source is photographed at different angles to generate X-rays The energy distribution is different. The difference in energy distribution of X-rays makes the energy difference on the detector after being attenuated by the irradiated object will be very large, and finally the gray value of the projected image from different angles will vary greatly, and this energy difference will affect the reconstruction of the image. Quality has a more serious impact. [0003] The traditional method to solve the problem of uneven energy distribution of X-rays is to co...
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IPC IPC(8): G06T5/00
Inventor 陈永丽牛杰胡扬崔凯张文日
Owner SHANGHAI UNITED IMAGING HEALTHCARE