[gate-users] ECAT7 Sinogram size and STIR reconstruction

[Nikolaos Karakatsanis]

Hello users,

I have produced an ECAT7 output file using version 1.2.0 of Gate.
The ECAT7 parameters I have chosen for the ecat system are:
mashing 1
span 5
maxringdiff 22
The time slice I have used was equal to the total time of experiment.(1 
frame)
The size of the output file was 100MB approximately.However when I attempted 
to reconstruct this file with STIR it has taken a lot of time (i.e. several 
hours).
As a result I would like to ask if the size of 100MB using the above 
parameters is normal?A user of STIR told us that this size seems to be big.
Furthermore it would be useful for me to be informed whether 3-4 hours of 
reconstruction are a normal duration for the reconstruction of an ECAT7 file 
of 100MB.
Finally I would like to know if a reduced size of an ECAT7 sinogram (for 
example by increasing the value of span parameter) will result in an 
unacceptable low-quality reconstructed image!

Nicolas Karakatsanis
Nuclear Imaging Medical Lboratory
School of Electrical & Computer Engineer
National Technical University Of Athens
www.biosim.ntua.gr/NIMlab


I would like to