[Castor-users] PSF+TOF reconstruction error

[Hadi Rezaei]

I use castor_v3.0.1. Two of the content of my .cdh files are below:
1)
Data filename: miniderenzo420ring0.6sTOF_df.Cdf
Number of events: 46858725
Data mode: list-mode
Data type: PET
Start time (s): 0
Duration (s): 0.6
Scanner name: miniderenzo420ring0.6sTOF
Calibration factor: 1
Isotope: unknown
TOF information flag: 1
TOF resolution (ps): 430
List TOF measurement range (ps): 5753.19
Coincidence kind flag: 1
Maximum axial difference mm: 1200

2)
Data filename: miniderenzo336ring0.6sTOF350_df.Cdf
Number of events: 42513982
Data mode: list-mode
Data type: PET
Start time (s): 0
Duration (s): 0.6
Scanner name: miniderenzo336ring0.6sTOF350
Calibration factor: 1
Isotope: unknown
TOF information flag: 1
TOF resolution (ps): 350
List TOF measurement range (ps): 4800
Coincidence kind flag: 1
Maximum axial difference mm: 960
***********************************************
The TOF values are 430 ps and 350 ps that I added on "-TOF reso" on
cstor-GATERootToCastor. I only added "Maximum axial difference" on .cdh
files.
thank you so much
Best

On Tue, Sep 15, 2020 at 7:21 PM FILIPOVIC PIERUCCI Marina <
Marina.FILIPOVICPIERUCCI at cea.fr> wrote:

> 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> 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] de
>> la part de Hadi Rezaei [hrezaei.m.ph at gmail.com]
>> *Envoyé :* mardi 15 septembre 2020 12:05
>> *À :* 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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