[Castor-users] Problem of data conversion for Phillips Gemini TF 64

[tmerlin]

Dear Li,

I believe you already tried it, but you could also parameterize the 
direction of the detector indexation using "rotation direction: CCW" in 
your geom file (clockwise is default).

Hope this helps,
Thibaut


On 20/10/2020 01:54, Li, Shenpeng (H&B, Parkville) wrote:
>
> Dear Castor users,
>
> I am trying to convert the raw PET data (list-mode) from Phillips 
> Gemini TF 64 to Castor format. Currently, I can read the pair of 
> crystal indexes (transvers and axial) from Gemini data, and then use 
> them to generate the crystal IDs to the corresponding events. I 
> converted the PET data to the Castor formats (both list-mode and 
> histogram) by using the crystal IDs from Gemini. However, I found the 
> orientation difference between castor reconstruction and PET console 
> reconstruction. I have tried to change the “resections first angle” in 
> the geom file to match the rotation, but the castor image is still 
> flipped (left-right and superior-inferior). I am not sure whether this 
> image flip is related to the indexation direction (eg. clock-wise v.s. 
> counter clock-wise) between castor and Gemini. The mismatch 
> orientation between then castor image and CT attenuation map (in 
> Gemini orientation ) makes attenuation correction difficult.
>
> Does anyone know the details of Gemini’s crystal indexation? So, I can 
> convert the crystals IDs to the castor indexation. Or, is it possible 
> to derive the sinogram of attenuation file from scanner (similar to 
> Siemens machines by using e7tools)? or What other options to solve 
> this issue.
>
> I appreciate your help.
>
> Best Regards,
>
> *Shenpeng Li, PhD.*
>
> CERC Postdoctoral Fellow
>
> *Health and Biosecurity, The Australian e-Health Research Centre, CSIRO*
>
> 343 Royal Parade, Parkville, Victoria 3052, Australia
>
> *Dept of Nuclear Medicine and Centre for PET, Austin Hospital*
>
> LVL1 Harrold STOKES Block, 145 Studley Road, Heidelberg, Victoria 
> 3084, Australia
>
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-- 
Thibaut MERLIN -- PhD

Docteur en Imagerie Médicale au Laboratoire de Traitement de l'Information Medicale (LaTIM - INSERM UMR 1101)
Institut Brestois de recherche en Bio-Santé (IBRBS)
12 Avenue Foch, 29200 Brest, FRANCE
Tel: 06.75.12.24.90

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