Dear. CASToR Developers and Users,
I simulated a brain pet for brain use, and after reconstruction, I want to obtain the scatter fraction for the following case.
- true + scatter coincidence event
- only true coincidence event
- Data after correcting scatter using the -sc function provided by castor
However, if I do simulation, I can get the scatter fraction because I know the information about coincidence for No. 1 and No. 2, but in case No. 3
castor-GATERootToCastor -i utah_test.root -TOF_reso 220 -o utah_t -m utah.mac -s utah -geo -sc
castor-recon -df utah_t_df.Cdh -dout utah_t -dim 400,400,240 -vox 0.5,0.5,0.5 -proj joseph -opti MLEM -it 10:2 -conv gaussian,2.5,2.5,3::psf -flip-out Y - I don’t know about the scatter fraction because I use th 12 -atn Att_Coef_Map_203mm_vox_0.5_avox_0.5.hdr.
Below is the header file I created for reconstruction.
Data filename: utah_t_df.Cdf
Number of events: 737070
Data mode: list-mode
Data type: PET
Start time (s): 0
Duration (s): 30
Scanner name: utah
Calibration factor: 1
Isotope: unknown
TOF information flag: 1
TOF resolution (ps): 220
List TOF measurement range (ps): 1096.35
I would appreciate it if you could tell me how to obtain the scatter fraction from the reconstruction image using the scatter correction function supported by castor.
Thank you for reading
from. David