[gate-users] Re: [Stir-users] interfile headers for ECAT 953 system from Gate output

[Claude Comtat]

Please refer to the GATE user's guide (data output, ECAT7 output, 
sinogram file):

The radial bin size in the scan sub-header is set to the half-value of 
the crystal transverse sampling and does not take into account the arc 
and depth-of-interaction (D.O.I) effects. After arc correction, the 
radial bin size should be slightly increased to account for the D.O.I. 
effect (see Figure 10.4). Note that this correction is included in the 
reconstruction software provided with the ECAT scanners.

Claude

Qianmei Zhang wrote:

> 
> Thank you again Kris,
> 
> I know what you mean. But as long as I define the system of ECAT 953, no 
> matter how i change the radius of scanner, the bin is always 3.1 mm from 
> gate output.
> 
> Another thing is that  I couldn't run ifheaders_for_ecat7 to make 
> interfile headers that point to the Ecat7 file without changing the bin 
> sizes to make them match to each other.  That is, ifheaders_for_ecat7 
> (the version 1.2) may use the Scanner value.
> 
> Qianmei
> 
> 
> 
>


-- 
Claude Comtat					comtat at ieee.org
Image acquisition and processing group		tel: +33 1 69 86 77 02
Frédéric Joliot Hospital Facility		fax: +33 1 69 86 77 49
French Atomic Energy Commission 		www-dsv.cea.fr/shfj