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, bowan...@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 > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
