DR machine-based dual energy subtraction method

Abstract

The invention discloses a DR machine-based dual energy subtraction method. The method comprises the following steps of S1: obtaining a high-energy image and a low-energy image of an X ray with an exposure interval of 2s; S2: performing registration on the low-energy image by taking the high-energy image as a template to obtain a low-energy image which is not shifted relative to the high-energy image; and S3: performing logarithmic transformation on the high-energy image and the registered low-energy image, and performing subtraction processing and display. According to the method, the exposure interval of the ray can be prolonged to 2s; an improved registration method is adopted, so that the motion artifacts caused by patient moving, rotation, image brightness unconsistency, noises and the like are effectively corrected; and in the aspect of high and low-energy subtraction calculation, the high-energy image and the registered low-energy image are subjected to the logarithmic transformation, and the low-energy image is multiplied by an elimination factor to eliminate soft tissues or bone tissues, so that the calculation speed is greatly increased, and the calculation complexity and the computer memory demands are effectively lowered.

Description

technical field [0001] The present invention relates to image processing technology, in particular to a DR machine-based dual-energy subtraction method. Background technique [0002] The dual-energy subtraction technology is mainly used for chest X-ray photography. It uses two consecutive exposures, and subtracts the energy difference between the two exposures to obtain bone and soft tissue images separated by bone and flesh. The display of lesions and calcified nodules in the lung plays an important role. Soft tissue pictures are pictures of bone structures removed, so that the information of lung lesions can be better displayed. [0003] Dual-energy subtraction technology can improve the detection rate of pulmonary calcifications and pulmonary nodules, and some calcifications and some nodular lesions in the lungs are an important basis for diagnosing lung diseases, and calcifications are obvious in bone tissue images. The nodules without calcification are all presented on...

AI Technical Summary

Problems solved by technology

[0004] However, the dual-energy subtraction technology in the prior art has the following defects: (1) it has high requirements for photographic equipment, and the exposure of two images must be completed within an exposure interval of 200 milliseconds; (2) the collected high and low energy The image has a large shift difference, including image rotation, scale scaling, brightness difference, noise introduced by high and low dose shooting, etc.; (3) The calculation speed is slow and the memory requirements are high

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