[gate-users] HR+

[Mutanga Theodore]

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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