[gate-users] HR+

[Claude Comtat]

Hi all,

I do not know why, but the values listed in Table 3 of the PMB paper for 
the HR+ refer to the full-width at one tenth of the maximum and not at 
half-maximum !!!!

Regards,

Claude

Mutanga Theodore wrote:

> Hi and thanks for the information,
> 
> I don't have access to Jan's article but it is quoted in another article
> byt Jan et al , GATE : A Simulation Toolkit for PET and SPECT. Here he has
> got the resolution for the ECAT HR+ as
> 
> radial at 10cm 11.8
> tangential at 10cm 10.7
> 
> However I cannot say my method has been good because in the first place I
> just simulated point sources in air, no casing, ( which is not true in
> reality) I haven't corrected for anything ( NEMA didn't mention any
> corrections though)??
> 
> In another article published in EJNM and Molecular Imaging, Vol 30 N0 11
> Nov 2003 the resolution of the ECAT HR+ is quoted as
> 
> 2D axial at 0cm = 4.2mm
>          at 10cm= 5.0mm
> 
>    transaxial 1cm = 4.6
>               10cm = 5.4mm
> 
> 
> 3D axial at 0 cm 3.5 mm
>             10cm = 5.3
>     transaxial 1cm = 4.6mm
>                 10cm = 5.4
> I think NEMA 94 was used here , I haven't seen any data from using NEMA
> 2001 maybe some has some references.
> 
> If someone has S. Jans paper I would be happy to see it and replicate his
> methods.
> 
> 
> Cheers
> 
> Theodore
> 
> 
> 
> 
>>>By the way I was simulating the ECAT exact hr+ and I would
>>>like to compare my results with someone Here is what I had
>>>for the resolution measurements , NEMA 2001 !
>>>
>>>transverse @ 1cm = 8.3 mm
>>>axial @1 cm 11.5 mm
>>>
>>>
>>>transverse radial @ 10cm = 10.59mm
>>>transverse tangential@ 10cm = 10.66mm
>>>
>>>axial @10cm 10.31 mm
>>>
>>>
>>Seems  way too low resolution to me. Should be about 5mm (measured).
>>
>>The 'old' NEMA HR+ reference is Brix et al, JNM 1996
>>
>>I believe Herzog, Tellman et al have a proc./paper with NEMA 2001
>>measurements for 'four Siemens ECAT PET-scanners'.
>>
>>I thought Sebastien Jan has a paper on simulating HR+ with GATE.
>>
>>Kris
>>
>>
>>PS: by the way: can we try to keep email subject lines relevant to the
>>topic discussed?
>>
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>>
>>
> 
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> 
> 


-- 
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