The number of volumes in the merged files is the number of samples that
are stored for each model parameter (theta, phi, f etc) in order to
describe the distribution on that parameter. This is always 50 and does
not depend at all on the number of volumes of data collected.
R Huang wrote:
>I have one question about the number of volumes for merged_thsamples.
>Using fslview to check Bedpost output, I found that
>the merged_thsamples always has 50 volumes,
>no matter how many diffusion gradient directions
>applied in diffusion-weighted images.
>(I have compared the merged_thsamples obtained from
>diffusion data of 36 diffusion directions, 60 directions,
>and 81 directions. The diffusion-weighted data were acquired
>from 1.5T Siemens Sonata, b=0/800).
>Any comments and suggestions please
Dr Heidi Johansen-Berg
Wellcome Trust Training Fellow
Oxford Centre for Functional Magnetic Resonance Imaging of the Brain
John Radcliffe Hospital
Oxford OX3 9DU
Tel: 01865 222782
Fax: 01865 222717
email: [log in to unmask]