[gate-users] Image Reconstruction of Gate output

[Long ZHANG]

Dear Sadek,

That's great if you can implement the DST code. It looks almost finished.

My idea is to build a generic framework based on your code. With this framework,
the coding work will be greatly simplified for new scanner. It's a abstracted
layer which can call different set of functions for a different scanner. It's
pretty important when porting it to GATE, for not only the correctness, but also
the optimised design.

So it's very important to know root script characters, such as callback functions,
or object oriented characters like dynamic binding, etc. Or I think a input
parameter file or a static table is needed (like STIR). I only know root is C/C++
like, but no deeper study.

Helps is highly appreciated!

Regards,

Long





In your mail:
>From:"Nehmeh, Sadek/Medical Physics" <nehmehs at mskcc.org>
>Reply-To: GATE feedback and helpline for Users <gate-users at lphe1pet1.epfl.ch>
>To: "GATE feedback and helpline for Users" <gate-users at lphe1pet1.epfl.ch>
>Subject: RE: RE: [gate-users] Image Reconstruction of Gate output
>
>Dear Theodore and Long,
>
>Yes I'm back, and sorry for taking me time replying to your emails.
>Long, I think what you have suggested in your previous email regarding
>evaluating the sinogram binner for the DST, and try to incorporate it
>with GATE, is a great idea. Meanwhile, I am also testing that for the
>DST configuration. Hopefully I will get back to you tomorrow with my
>feedback.
>
>Theodore, for your NEMA measurements, I know O. Mawlawi at M.D. Anderson
>did the NEMA2001 measurements for the DST. It was published in the JNM
>(J Nucl Med. 2004 Oct;45(10):1734-42); you may wana refer to that, and
>reproduce their analysis method, for comparison.
>
>
>	Cheers,
>
>	Sadek
>
> 
>
>Theodore
>Sent: Monday, January 03, 2005 11:30 AM
>To: Long ZHANG; GATE feedback and helpline for Users
>Subject: Re:RE: [gate-users] Image Reconstruction of Gate output
>
>Hi Long,
>it seems Sadek is back, have you written to him about the code ?
>
>Cheers
>
>Theodore
>
>By the way I was simulating the ECAT exact hr+ and I would like to
>compare my results with someone Here is what I had for the resolution
>measurements , NEMA 2001 !
>
>transverse @ 1cm = 8.3 mm
>axial @1 cm 11.5 mm
>
>
>transverse radial @ 10cm = 10.59mm
>transverse tangential@ 10cm = 10.66mm
>
>axial @10cm 10.31 mm
>
>
>I wish to find out from the GATE users if these look reasonable, I was
>planning to do measurements myself on the ecat but I dont have acceess
>to one since initially I was simulating the DST. Also in the NEMA 2001
>there is no mention about matrix size for reconstruction , doesnt this
>affect the resolution ? I did not correct for anythin in the data from
>GATE , would it be better to correct for randoms, scatter ect , if so
>HOW (using GATE ?)?
>
>
>Cheers
>
>'Theo
>
>> Dear Kris,
>>
>> Thank you very much.
>>
>> It seems that I have mistake the sinogram width (angle position) as 
>> sinogram length (view number, or tangential bin number, or 
>> displacement position).
>> Am I
>> right now?
>>
>> Regards,
>>
>> Long
>>
>> In your mail:
>>>From:"Kris Thielemans" <kris.thielemans at csc.mrc.ac.uk>
>>>Reply-To: GATE feedback and helpline for Users  
>>><gate-users at lphe1pet1.epfl.ch>
>>>To: "'Long ZHANG'" <zhanglong99 at tsinghua.org.cn>,
>>   "'GATE feedback and helplinefor Users'" 
>> <gate-users at lphe1pet1.epfl.ch>
>>>Subject: RE: [gate-users] Image Reconstruction of Gate output
>>>
>>>>
>>>> BTW, I was pussled by the sinogram width of DST (420 crystal per 
>>>> ring). The number 249 is larger than the 420/2 = 210. How can DST 
>>>> get the extra LORs of 39? By interpolation? Could this help to 
>>>> improve the spatial resolution? Thank you!
>>>>
>>>Notation: N= num_detectors per ring
>>>
>>>Why do you think that the max sinogram width is N /2? This is a 
>>>hardware choice (recent CTI scanners tend to have sinogram_width=N/2).
>
>>>The 'physical' maximum of LORs in 2D sinograms is (N^2-N)/2 (i.e. all 
>>>lines between pairs of detectors, excluding the degenerate cases, and 
>>>identifying det pairs ij and ji). The max number of views is N/2 
>>>(you'd expect N, but it's halved because of interleaving). So, the max
>
>>>sinogram width is something like (N-1)
>>>
>>>
>>>Kris
>>>
>>>_______________________________________________
>>>gate-users mailing list
>>>gate-users at lphe1pet1.epfl.ch
>>>http://lphe1pet1.epfl.ch/mailman/listinfo/gate-users
>>>
>>
>>
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