[Gate-users] From phantom to PET image

[Stephen Yip]

Hello,

I have written a macro (attached) for the voxelized phantom and source by
following the example on the wiki page. (where act_1.bin in the header file
indicates the binary XCAT phantom). I don't even know if I am writing the
header and activity tables correctly.

In any case, the phantom doesn't look so right (attached image). The
phantom should be a XCAT phantom instead of a box in the center of the
scanner (attached image).

GATE keeps complaining about the following.
GateGeometryVoxelInterfileReader::ReadFile:WARNING: voxel not added
(material translation not found); value; 0

What am I missing?

Thanks!
Stephen




On Thu, Mar 6, 2014 at 8:26 PM, Stephen Yip <stephen.fyip1 at gmail.com> wrote:

> Nevermind. I figured it out (brain farted). Thanks!
>
>
> On Thu, Mar 6, 2014 at 1:16 PM, Stephen Yip <stephen.fyip1 at gmail.com>wrote:
>
>> Hi,
>>
>> 1. What is the difference between voxelized source and phantom?
>>
>> I am trying to create a realistic PET image using a phantom image (w/
>> various activities in different parts of anatomy).  So the phantom can
>> in principle emit photon-pair at each voxel location......so if each voxel
>> can emit photon(s), the phantom would behave like a voxelized source, then?
>>
>> To create a PET image, all I need is a voxelized source right?
>>
>> 2. I added a voxelized source to the world (w/ header file,
>> rangeTranslation table, and the phantom binary image). It seems to work
>> (Gate didn't complain), but I am not sure.
>> Is there any way I can visualize the source to make sure it is in the
>> right place?
>>
>> 3. If a phantom is actually a source, what is voxelized phantom for then?
>>
>> Sorry for not being articulate my questions as I am so confused now.
>>
>> Thanks,
>> Stephen
>>
>>
>>
>>
>> On Thu, Mar 6, 2014 at 5:53 AM, Simon Stute <gate.stute at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> Just follow the documentation :
>>> http://wiki.opengatecollaboration.org/index.php/Users_Guide_V7.0:Voxelized_Source_and_Phantom
>>>
>>> Regards,
>>> Simon
>>>
>>>
>>> On Wed, Mar 5, 2014 at 8:55 PM, Stephen Yip <stephen.fyip1 at gmail.com>wrote:
>>>
>>>> Hi,
>>>>
>>>> I have a phantom image (with different radioactivity in different parts
>>>> of anatomy) in binary format. I would love to obtain a PET projection of
>>>> the phantom image.
>>>>
>>>> 1. Can GATE read binary? Do I need to convert the image into another
>>>> format?
>>>>
>>>> 2. How do I use insert the phantom in the written macro of a PET
>>>> scanner?
>>>>
>>>> Thanks!
>>>>  Stephen
>>>>
>>>> _______________________________________________
>>>> Gate-users mailing list
>>>> Gate-users at lists.opengatecollaboration.org
>>>> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>>>>
>>>
>>>
>>
>
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