Hi Bobo, intensity is just the brightness of a pixel. Ideally, this brightness is indicative of only the MR parameters of the tissue (PD, T2, and T1). This is what makes gray matter dark and white matter bright. However, there are changes in intensity across space that are unrelated to the biology. For example, as tissue gets further away from the receive coil, the intensity gets darker. These biologically-unrelated fluctuations in intensity are called "bias". doug

On 05/03/2012 10:03 AM, bowang21@mail.ustc.edu.cn wrote:

Dear all, I just want to know the difference between the intensity and the bias field.Is not the intensity indicated by the bias field?

 yours BOBO

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