A Dual Energy Subtraction Method Based on DR Machine

Abstract

The invention discloses a dual-energy subtraction method based on a DR machine, which includes the following steps: S1: acquire X-ray high-energy images and low-energy images with an exposure interval of 2 seconds; S2: use the high-energy image as a template, The energy images are registered to obtain a low-energy image that is not shifted relative to the high-energy image; S3: Logarithmic transformation is performed on the high-energy image and the registered low-energy image, subtracted and displayed. The ray exposure interval of the present invention can be extended to 2 seconds; the present invention adopts an improved registration method to effectively correct motion artifacts caused by patient displacement, rotation, inconsistent image brightness, noise, etc.; the present invention reduces energy consumption at high and low energy levels. In terms of shadow calculation, the high-energy image and the registered low-energy image are logarithmically transformed, and the low-energy image is multiplied by an elimination factor to eliminate soft tissue or bone tissue, which greatly improves the calculation speed and effectively reduces the computational complexity and Requirements for computer memory.

Description

technical field [0001] The present invention relates to image processing technology, in particular to a dual-energy subtraction method based on a DR machine. Background technique [0002] 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 tissue pictures and soft tissue pictures of bone and flesh separation. The display of lesions and calcified nodules in the lungs plays an important role. Soft tissue pictures are pictures with 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 the diagnosis of lung diseases, and calcifications are obvious in bone tissue images. All nodules without calci...

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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