[gate-users] HR+

[Kris Thielemans]

> 
> 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
> 
> 
> 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
> 
> 
My understanding is that the main diff between old and new NEMA is that
old NEMA said you had to use tiny pixel sizes, while new NEMA says to
use 'every-day' ones. That will make a large difference, but not so
large (unless you use huge pixel sizes). For a survey on how FWHM
depends on pixel-size and reconstruction algorithm, see

K. Dinelle, K. Thielemans, C. Tsoumpas, T. J. Spinks, An Evaluation of
Various Analytic Reconstruction Algorithms and Implementations for 2D
and 3D PET, poster at IEEE Medical Imaging Conf. 2004. available at
http://www.hammersmithimanet.com/~kris/papers/2004_MIC_FBP.pdf