[Gate-users] Strange Dose Profiles

[Christopher Watanabe]

Hi Ashok,

Thanks for the answer. I was under the impression that attaching the actor
to a defined volume (in this case the sphere of material) defines the size.
That seems to be true from looking at the .mhd file, as the # of voxels *
voxel size = length of the sphere. In any case, here's how I defined the
actor:

[image: P32_Screenshot.png]

As you see, I've /attachTo-ed the volume target, which is my spherical
volume of material. Is there a reason this doesn't work?

Also, could you possibly give me an example of defining the size
independent of attaching the actor to a volume?

Best,

Chris

On Thu, Jan 24, 2019 at 12:53 AM Ashok Tiwari <tiwarias at yahoo.com> wrote:

> Hi Christopher,
>
> How did you define the dose actor for P-32 beta emitter? I suggest you to
> check the parameters of the dose actors (Position, VoxelSize, Resolution,
> Size). Define the size of dose actor as, size = voxel size times the
> resolution of the dose matrix. If you want to set your dose actor in the
> center of spherical phantom then set the position as 0 0 0 mm.
>
> I’ve done dose measurements for P-32 radionuclide in vacuum, and measured
> about 10^(-15) Gy deposited by each primary particle.
>
> Regards,
> Ashok
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