The rician distribution of noisy mri data

Magnetic Resonance in Medicine - Tập 34 Số 6 - Trang 910-914 - 1995
Hákon Guðbjartsson1, Samuel Patz2
1Massachusetts Institute of Technology Department of EECS, Boston, USA.
2Brigham and Women's Hospital (S.P.), Department of Radiology, Boston, Massachusetts.

Tóm tắt

AbstractThe 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.

Từ khóa


Tài liệu tham khảo

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Magnetic Resonance in Medicine

Tập 34 Số 6

910-914

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