[Gate-users] Problem with voxelised phantom and tabulatedtranslator in GATE v6.0

[Simon Stute]

Hi Ali,

I though I answered to you... Maybe I have a hint.
Concerning the Regular algorithm, there is a special feature used in the
particule transportation, that consists in skipping voxel boundaries when
neighboors voxels have the same material. It limits the number of steps and
speeds up the transportation.
And maybe you get some 0 in your dose collection because of that.

You can try (in gate_v5) to modify the file
source/voxel/src/GateRegularParameterization.cc, at line 172:

     SetSkipEqualMaterials(1);

Just set the value to 0, and voxel boundaries will be forced to produce a
step.

It is just a suggestion ! I hope it could solve the problem, but maybe it is
something much more subtle and so difficult to find.
Because the Regular navigation is totally managed by G4 (building of the
parameterization), that was not the case for Parameterized and Compressed,
so maybe it could explain also the problem of placement described by Marios.

Hope this helps,
Simon

On Wed, Apr 7, 2010 at 11:47 PM, AliAsghar Parach <aaparach at gmail.com>wrote:

> Dear Simon and marios
> I asked the same question a few month ago but I couldn't get my answer too.
> you can see it in gate users mails. it's subject was:
> voxelphantom_GATE5_error
> if you used compressed and regular without dose actor and use previous dose
> collection method you can see what I said about their differences.
> if you solved your problem please aware me.
> regards
> On Wed, Apr 7, 2010 at 9:14 PM, Marios Myronakis <
> Marios.Myronakis at icr.ac.uk> wrote:
>
>> Dear Simon,
>>
>> Thank you for your reply.
>>
>> Indeed I tested it and I got hits (that make sense) only when the
>> compressedMatrix is used. In other words it seems like it is not a
>> visualisation problem. I attach the results from the dose actor for each
>> method.
>>
>> I also tested it in the patched version (V6.0_p01) and I get the same
>> results.
>>
>> I also tested it using the virtual GATE machine and I still get the same.
>>
>> I am really puzzled as I cannot find where am I making any mistake.
>>
>> Thank you for your help.
>>
>> Marios
>>
>> -----------------------------------------------------------------
>> Marios Myronakis
>>
>> PhD Student
>> Joint Department of Physics
>> Institute of Cancer Research and
>> Royal Marsden Foundation Trust
>> Fulham Road
>> London SW3 6JJ
>> UK
>>
>> Tel.: +44 (0) 207 808 2500
>> Fax.: +44 (0) 207 808 2522
>> E-mail: Marios.Myronakis at icr.ac.uk
>> -----------------------------------------------------------------
>> >>> Simon Stute <gate.stute at gmail.com> 04/07/10 5:30 PM >>>
>>  Hi Marios,
>>
>> Do the results of your simulation agree with the visualization, or is it
>> just a visualization problem ?
>> Did you test this ? It would be very important to know that to try to
>> understand the problem.
>>
>> Cheers,
>> Simon
>>
>> On Wed, Apr 7, 2010 at 5:04 PM, Marios Myronakis <
>> Marios.Myronakis at icr.ac.uk
>> > wrote:
>>
>> > Hello,
>> >
>> > since I didn't get any reply to my previous post (Fri Mar 5 15:16:10 CET
>> > 2010
>> >
>> http://lists.opengatecollaboration.org/mailman/private/gate-users/2010-March/003974.html
>> )
>> > I would like to rephrase my question.
>> >
>> > I am using a tabulated translator to insert a voxelised phantom. When I
>> use
>> > the compressedMatrix the phantom is properly displayed and placed. When
>> I
>> > use the regularMatrix, the phantom is placed at the axes origin. In both
>> > cases when I type the command /gate/phantom/describe the phantom is
>> shown at
>> > its defined position.
>> >
>> > I attach the mac file and two images where the above described problem
>> is
>> > depicted.
>> >
>> > Thanks for your time,
>> > Marios
>> >
>> > -----------------------------------------------------------------
>> > Marios Myronakis
>> >
>> > PhD Student
>> > Joint Department of Physics
>> > Institute of Cancer Research and
>> > Royal Marsden Foundation Trust
>> > Fulham Road
>> > London SW3 6JJ
>> > UK
>> >
>> > Tel.: +44 (0) 207 808 2500
>> > Fax.: +44 (0) 207 808 2522
>> > E-mail: Marios.Myronakis at icr.ac.uk
>> > -----------------------------------------------------------------
>> >
>> > The Institute of Cancer Research: Royal Cancer Hospital, a charitable
>> > Company Limited by Guarantee, Registered in England under Company No.
>> 534147
>> > with its Registered Office at 123 Old Brompton Road, London SW7 3RP.
>> >
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>
>
>
> --
> Ali Asghar Parach,Ph.D. student in Medical Physics,Tarbiat Modares
> University,Tehran,Iran
>