The rician distribution of noisy mri data

作者：Hákon Guðbjartsson, Samuel Patz · 发表于：Magnetic Resonance in Medicine · 年份：1995 · DOI：10.1002/mrm.1910340618 · 被引用次数：2526 · 研究领域：Medical Image Segmentation Techniques、Image and Signal Denoising Methods、Seismic Imaging and Inversion Techniques

The image intensity in magnetic resonance magnitude images in the presence of noise is shown to be governed by a Rician distribution. Low signal intensities (SNR < 2) are therefore biased due to the noise. It is shown how the underlying noise can be estimated from the images and a simple correction scheme is provided to reduce the bias. The noise characteristics in phase images are also studied and shown to be very different from those of the magnitude images. Common to both,however, is that the noise distributions are nearly Gaussian for SNR larger than two.