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Method and system for correcting errors in MR images due to regions of gradient non-uniformity for parametric imaging such as quantitative flow analysis
Method and system for correcting errors in MR images due to regions of gradient non-uniformity for parametric imaging such as quantitative flow analysis
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机译:校正由于梯度不均匀区域引起的MR图像误差的方法和系统,用于参数成像,例如定量流分析
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摘要
A system and method for correcting systematic errors that occur in MR images due to magnetic gradient non-uniformity is disclosed for use with parametric analysis. A GradWarp geometric correction operation is applied in reconstructing quantitative parametric analysis images in regions of gradient non-uniformity. The method includes generating an error map of magnetic gradient strength as a function of distance for an MR image scan and acquiring MR data that contain such systematic errors. The method next includes either calculating a measured diffusion image, a phase difference image, or similar image, based on the acquired MR data, and then calculating a corrected parametric image using the error map and the measured diffusion image, the phase difference image, or other similar parametric image. The method is incorporated into a system having a computer programmed to perform the aforementioned steps and functions.
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