Image correction method and device, medical image generation method and device
An image correction and medical image technology, applied in the field of image processing, can solve the problems of large energy difference, artifacts and deviations in medical images, and achieve the effect of improving accuracy
Active Publication Date: 2018-01-12
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 present invention relates to an image correction method and device, and a medical image generation method and device. The image correction method is used to correct the gray value of projection images of different projection angles in a medical imaging system, including: segmenting the projection images of the projection angles, Obtaining a foreground image corresponding to the projection angle; adjusting the average gray value of the foreground image corresponding to the projection angle to be close to or equal to a reference threshold. The technical scheme of the present invention can obtain a foreground image that truly reflects the details of the irradiated object, avoiding the situation that the gray value of the projected image seriously deviates from the real gray value after correction using the existing correction method, and improves the accuracy of correction .
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