[Castor-users] PSF+TOF reconstruction error

[FILIPOVIC PIERUCCI Marina]

Strange, which version of CASToR do you use? What is the size of the list mode TOF quantization bin and what do you mean by different TOF values, different values of the TOF quantization bin size? Do you add this info in the .cdh yourself or do you rely on the GATE to CASToR converter?
________________________________
De : Hadi Rezaei [hrezaei.m.ph at gmail.com]
Envoyé : mardi 15 septembre 2020 16:29
À : FILIPOVIC PIERUCCI Marina
Cc : castor-users at lists.castor-project.org
Objet : Re: [Castor-users] PSF+TOF reconstruction error

Hi Marina
Thank you for responding
My reconstructed image is Ok and when I imply only TOF (not PSF) I don't see this warning and the TOF bin is provided in .cdh file however the different TOF values don't make a difference in image quality. Is this an issue in the reconstruction process or it is normal?
Thank you
Best
Hai

On Tue, Sep 15, 2020 at 2:46 PM FILIPOVIC PIERUCCI Marina <Marina.FILIPOVICPIERUCCI at cea.fr<mailto:Marina.FILIPOVICPIERUCCI at cea.fr>> wrote:
Hi Hadi,

This warning should be related only to TOF, not to the use of PSF. It says that your input datafile implies that your scanner has an (almost) infinite precision for TOF measurements. If this is the case everything's ok, otherwise if your scanner quantizes TOF measurements, you should provide the quantization bin or step it in the datafile header (.cdh).

All of this won't really make a difference for the reconstructed image, unless the quantization of the TOF measurements is very rough, which is probably not the case for your scanner.

Is the reconstructed image OK?

Best

Marina

________________________________
De : Castor-users [castor-users-bounces at lists.castor-project.org<mailto:castor-users-bounces at lists.castor-project.org>] de la part de Hadi Rezaei [hrezaei.m.ph at gmail.com<mailto:hrezaei.m.ph at gmail.com>]
Envoyé : mardi 15 septembre 2020 12:05
À : castor-users at lists.castor-project.org<mailto:castor-users at lists.castor-project.org>
Objet : [Castor-users] PSF+TOF reconstruction error

Dear CASToR users
I used TOF + psf for reconstruction a Derenzo phantom but I found this warning.
"Warning: quantization TOF bin size wrong or not provided, so switching to TOF list-mode reconstruction which neglects the quantization TOF bin size!"
Does it mean that I can not use psf and TOF together in CASTOR??  I need to investigate PSF+TOF. How can I do it??
Any help would be appreciated.
Best
Hadi
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