Dear Emilia,
A few tips:
1) make sure subject head is positioned centrally in the coil volume: this can be done with the help of cushions and head support - and those have to be adapted to each head
2) use the homogeneity correction provided by Siemens "prescan normalize": signal correction using body coil (B1-correction calibration) is also quite useful
3) all post processing software can be helpful (i.e. SPM, "N3m"), but there will be a SNR/CNR penalty: it is always better to get the data using the best settings for your system
See you,
edson
On Apr27, 2011, at 6:29 AM, Emilia Lentini wrote:
Dear SPM list,
We have problems with intensity inhomogeneity in our MR images acquired in 3T scanner with 32 ch head coil.
The posterior part of the brain looks brighter than the rest of the brain in our T1 image.
Are there any options or toolboxes in SPM that we could use to correct for this intensity inhomogeneity?
We attach the problem image as an example for your inspection.
With best wishes,
Emilia/Maki
<Image_intensity_inhomo.JPG>