[gate-users] RE: [gate-devel] GE Advance

Fri Nov 19 23:19:09 CET 2004

Dear Theo,

In order to reconstruct Gate coincidence data, you have two options:

1) bin the coincidences according to GE format, and then push the resulting file to the GE scanner, and reconstruct using the GE software. I'm sorry I can't help you with the GE raw data format for the DST; we have only an Advance and and a DLS. But for bor both the Advance and the DLS, which are mainly the same, GE arranges raw data into projection planes, which are kind of similar idea as sinograms. If you are interested, I can send you my code which reads the Coincidence Tree from the root file, and outputs the Projection planes, which can be reconstructed using the GE reconstruction software on the PET console. You may need to modify the code according to the DST raw data format.

2) another solution, which is more practical, is to use the STIR software. 
However, I don't believe STIR knows about the DLS geometry at this point. Is that right Kris? In any way, to reconstruct the Gate data using STIR, let's say for a GE Advance  model, you also need to bin your Coincidences according to the STIR data format for the Advance. To do that, you need to re-write the Michelogram.ima file according to STIR format, which different than that for the Advance. In GE Advance, the segments are arranged as
0, +1, -1, +2, -2, ... However in STIR, please kris correct me if I'm wrong, the segments are arranged as: -11, -10, .....+10, 11. Once you do that, reconstruction with STIR becomes very straight forward. 

I hope this will help.

	Cheers,

	Sadek

-----Original Message-----
From: gate-users-bounces at lphe1pet1.epfl.ch [mailto:gate-users-bounces at lphe1pet1.epfl.ch] On Behalf Of Mutanga Theodore
Sent: Friday, November 19, 2004 4:19 PM
To: GATE feedback and helpline for Users
Subject: Re: [gate-users] RE: [gate-devel] GE Advance

Hi Sadek, it seems we are working on similar things, I used GE Discovery ST and you are using GE ADvance, have you used GATE to model to scanner ?
Are you getting any images from you scan ? I'd like to see if you succeded in reconstructing the sinograms, I am stuck in getting a valid sinogram, i have modeled the scanner all right and cheked the geometry, I tried some runs with simple phantoms and sources but the reconstructed sinograms (using STIR) don't show me anything. Ill be glad to see your results, maybe ill learn a thing or two.

Cheers
Theo

-----------------------
Dep't Of Radiation Physics´
Umeå University
Sweden

> Hi again, kris
>
> I have added those information in my header file, and it's now working.
> Thanks.
>
>   Sadek
>
> -----Original Message-----
> From:	gate-devel-bounces at lphe1pet1.epfl.ch on behalf of Nehmeh,
> Sadek/Medical Physics
> Sent:	Fri 11/19/2004 1:46 PM
> To:	GATE feedback and helpline for Users; ywyang
> Cc:	Devel_list GATE
> Subject:	[gate-devel] GE Advance
>
>
> 	Hi Kris,
>
> 	with STIR1.3, I'm getting the warnings below, when I run the 
> sensitivity. Am I doing smth wrong?! Thanks.
>
>
> WARNING: Scanner GE Advance: transaxial block info is not set
>
> WARNING: Scanner GE Advance: transaxial bucket info is not set
>
> WARNING: Scanner GE Advance: axial block info is not set
>
> WARNING: Scanner GE Advance: axial bucket info is not set
>
>
> 	Regards,
>
> ----------------------------------------
>  Sadek A. Nehmeh, Ph.D.
>  Assistant Attending Physicist
>  Medical Physics Department
>  Nuclear Medicine Service
>  Memorial Sloan-Kettering Cancer Center
>  Tel: (212)-639-2175
>  Email: nehmehs at mskcc.org
> ------------------------------------------
>
>
>      
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