Medical ultrasonic image de-noising method based on normal inverse Gaussian model

Abstract

The invention discloses a method for denoising a medical ultrasonic image based on a normal inverse Gaussian model, comprising the following steps: 1) using a noise imaging system to collect the envelope signal of the noise image, and establishing a medical ultrasonic image model; Step 1) The medical ultrasound image model obtained after the logarithmic transformation utilizes a pyramid filter bank to perform multi-scale and multi-directional decomposition, 3) For the two-dimensional discrete shearlet of the high-frequency part in each sub-band image obtained in the step 2) The transformation coefficients are subjected to threshold method adaptive shrinkage processing; 4) use the trilateral filter to filter the shearlet coefficients in the low-frequency part of step 2); 5) perform shearlet inverse transformation on all coefficients after step 3) and step 4) processing After processing, the medical ultrasound image after denoising is obtained. The invention can well suppress the speckle noise, and at the same time can better help doctors to analyze the condition.

Description

technical field [0001] The invention relates to a method for denoising medical ultrasonic images based on a normal inverse Gaussian model. The invention belongs to the field of medical ultrasonic image denoising, especially a shearlet transform medical image denoising method based on a normal inverse Gaussian model suitable for medical ultrasonic images. Background technique [0002] With the development of science and technology, in the field of medical imaging, imaging technologies such as ultrasound imaging, CT, and MRI have been applied in medical clinical diagnosis. Due to the rapid development of ultrasound imaging technology due to its advantages of high resolution, simple operation, instantaneity, etc., it has the characteristics of non-invasive, no radiation damage, fast and convenient, and has become a widely used and highly safe medical diagnostic technology. Especially for the examination of human body organs and tumor tissue, the use of ultrasound imaging techn...

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Problems solved by technology

[0012] The purpose of the present invention is to provide a medical ultrasonic image denoising method based on a normal inverse Gaussian model. On the one hand, the present invention improves the Laplace model based on a generalized Gaussian distribution, and proposes a new normal inverse Gaussian model. This model solves the problem of missing too many high-frequency coefficients. Bas...

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