[gate-users] Positron annihilation distance

[Claude Comtat]

Hi Rutao,

Sébastien ran the PET benchmark with F18 only (see .mac files), and the 
resulting positron range plot looks correct (see attached figure). 
Presumably, you have still F18 and 015 in your simulation. Please try 
the attached macro files.

All the best,

Claude

Rutao Yao wrote:
> Hi,
> 
> I have trouble to understand the positron-range results generated with 
> GATE. Maybe someone here can give me some advices.
> 
> For F18, the positron range distribution (see attached gif figure) shows 
> an unexpected peak between 1 and 2 mm, which is not present in published 
> literature (Levin and Hoffman, Craig S Levin and Edward J Hoffman 1999 
> Phys. Med. Biol. *44* 781-799; Laforest R, Rowland DJ, Welch MJ. 2002. 
> MicroPET imaging with nonconventional isotopes. IEEE Trans Nucl Sci 49, 
> 2119-2126).  The figure can be easily reproduced by running benchmarkPET 
> scripts, just remove the Oxygen15 parts in the sources.mac.  We saw 
> similar results with Oxygen15.
> 
> The GATE version we are using is v1.0.  I don’t see this issue mentioned 
> in the later version’s releaseNotes.
> 
> Thanks in advance!
> 
> 
> Rutao Yao, Ph.D.
> 
> University at Buffalo
> 
> <<...>>
> 
> 
> 
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> 
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-- 
Claude Comtat					comtat at ieee.org
Image Acquisition and Processing group		tel: +33 1 69 86 78 01
Frédéric Joliot Hospital Facility		fax: +33 1 69 86 77 49
French Atomic Energy Commission 		www-dsv.cea.fr/shfj
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