[Castor-users] about counts outside the phantom volume on reconstructed image

[Tiwari, Ashok]

Dear CASToR users and developers,

I've simulated a uniform phantom in GATE and exported the GATE data to CASToR for image reconstruction. During reconstruction, I've chosen only the true events and ran a reconstruction, with and without attenuation correction. Then I visualize the image using ImageJ (see attached), but I do not understand why counts are appearing outside the phantom volume. Could anyone help me understand why this is happening here? Has anyone seen this before? Is it due to noise and/or scattering outside the phantom?

Thank you for your help in advance.


Regards,

Ashok


---------------------
Ashok Tiwari
Ph.D. Candidate
Department of Radiology & Physics
University of Iowa Hospitals and Clinics
Office: P158, MRF
200 Hawkins Drive
Iowa City, IA 52242
ashok-tiwari at uiowa.edu

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