[Gate-users] Multiple detectors (responses) with Fixed Forced Detection

[Simon Rit]

Hi,
Please stick to the mailing list.
Sorry, this code is quite a mess... You can find how this is computed here:
https://github.com/OpenGATE/Gate/blob/develop/source/digits_hits/include/GateFixedForcedDetectionFunctors.hh#L345
So bin[0] is from 0 to 0.5*energyResolvedBinSize keV, bin[1] from
0.5*energyResolvedBinSize to 1.5*energyResolvedBinSize keV etc.
Simon

On Wed, Nov 29, 2017 at 1:57 PM, Clemens S. <clem.schmid at gmail.com> wrote:

> Dear Simon,
>
> concerning the resolved bin size: I don't understand the output of the
> energy resolved images exactly. They seem to have one more entry than
> expected when looking at the maximum spectrum energy divided by
> energyResolvedBinSize.
>
> For example:
>     max(spectrum) = 141 keV
>     energyResolvedBinSize = 1 keV
>         => first image dimension = 142
>
> Can you tell me which energy corresponds to   image[i] exactly? I had a
> look at the FFD source code but I could not find an answer so far.
>
> Thank you very much for your help!
>
> Kind regards
> Clemens
>
>
>
> 2017-10-04 10:34 GMT+02:00 Clemens S. <clem.schmid at gmail.com>:
>
>> Dear Simon,
>>
>> this sound perfect! Thank you very much.
>>
>> Kind regards
>> Clemens
>>
>> 2017-10-04 10:31 GMT+02:00 Simon Rit <simon.rit at creatis.insa-lyon.fr>:
>>
>>> Hi,
>>> What I do is record one spectral projection by setting the
>>> energyResolvedBinSize to 1 keV and a detector response d(e)=1 with a text
>>> file that looks like this:
>>> 0 1
>>> 1 1
>>> I obtain then a 3 image for each run where the 3rd dimension is the
>>> energy. I use this result offline to create the projection of each
>>> threshold separately.
>>> I don't know when this option was added wrt to Gate 7.2, you might have
>>> to update your Gate.
>>> Simon
>>>
>>> On Wed, Oct 4, 2017 at 10:18 AM, Clemens S. <clem.schmid at gmail.com>
>>> wrote:
>>>
>>>> Dear fellow GATE users,
>>>>
>>>> I am simulating spectral CT with *Fixed Forced detection* in GATE 7.2.
>>>> I am simulating one physical detector which has several energy threshold,
>>>> i.e. *several detector responses*. Each detector response produces its
>>>> own output (primary and scatter images).
>>>>
>>>> Up to now, I'm using one FFD actor for each threshold/response. This
>>>> gives correct results, but is not optimally efficient since the interaction
>>>> points are projected onto the detectors indepentently instead of projecting
>>>> once (conserving energy information) and *then* applying the detector
>>>> responses. (or I think that's what's happening)
>>>>
>>>> *My question is*: Is there a (more) efficient way to simulate several
>>>> detector responses with FFD?
>>>>
>>>> Thank you for your help!
>>>>
>>>> Kind regards
>>>> Clemens Schmid
>>>>
>>>> _______________________________________________
>>>> Gate-users mailing list
>>>> Gate-users at lists.opengatecollaboration.org
>>>> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>>>>
>>>
>>>
>>
>
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