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

[Julien Salvadori]

Dear Li,

For the Vereos PET scanner, the detection elements are arranged
transversely in the CCW direction and the angular position of the first
module with respect to the y-axis is - 80° (see figure).

[image: image.png]

If the convention is the same for the Ingenuity, you can try :
rotation direction: CCW
rsectors first angle : -80°.

Hope this helps,

Julien Salvadori

Le mar. 20 oct. 2020 à 01:55, Li, Shenpeng (H&B, Parkville)
<Shenpeng.Li at csiro.au> a écrit :

> 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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