[gate-users] HR+

[Kris Thielemans]

> I got the value for my simulation by using a 1mm diameter and 
> 1mm lenght cylindrical source in air (F 18 , activity 5.5MBq) 

As already said, don't do only air. Your positrons are flying far away
(I think that the positron range in air is larger than your scanner).

> and the the ECAT 962 in GATE example. For reconstruction I 
> used STIR FBP3DRP.I also tried matrix sizes 144, 180 288 256. 

STIR gives identical resolutions for different image sizes. Not for
different zooms. See our proceedings.

>  (I tried with FBP2D and OSMAPOSL but got worse resolution, I 
> also used Amide to draw the line profiles , there they use a 
> Guassian fit instead of a parabolic fit as stated in NEMA, 
> shouldn't be very different ?) 

Could be different, but enormously.

> I don't know do I have to 
> correct for something before reconstruction ?

I think that for those configurations all corrections will be tiny.