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- W4255356036 abstract "Image <i>non-uniformity </i>and<i> intensity </i><i>non-standardness </i>are two major hurdles encountered in human and computer interpretation and analysis of magnetic resonance (MR) images. Automated methods for image non-uniformity correction (NC) and intensity standardization (IS) may fail because solutions for them require identifying regions representing the same tissue type for several different tissues, and the automatic strategies, irrespective of the approach, may fail in this task. This paper presents interactive strategies to overcome this problem: interactive NC and interactive IS. The methods require sample tissue regions to be specified for several different types of tissues. Interactive NC estimates the degree of non-uniformity at each voxel in a given image, builds a global function for non-uniformity correction, and then corrects the image to improve quality. Interactive IS includes two steps: a calibration step and a transformation step. In the first step, tissue intensity signatures of each tissue from a few subjects are utilized to set up key landmarks in a standardized intensity space. In the second step, a piecewise linear intensity mapping function is built between the same tissue signatures derived from the given image and those in the standardized intensity space to transform the intensity of the given image into standardized intensity. Preliminary results on abdominal T1-weighted and T2-weighted MR images of 20 subjects show that interactive NC and IS are feasible and can significantly improve image quality over automatic methods. Interactive IS for MR images combined with interactive NC can substantially improve numeric characterization of tissues." @default.
- W4255356036 created "2022-05-12" @default.
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- W4255356036 date "2015-03-18" @default.
- W4255356036 modified "2023-10-10" @default.
- W4255356036 title "Interactive non-uniformity correction and intensity standardization of MR images" @default.
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- W4255356036 doi "https://doi.org/10.1117/12.2082878" @default.
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