[Gate-users] Helical Movement

[Kopchick, Benjamin]

My understanding is you should not set both the voxel size and resolution.
They are two ways of doing the same thing. Check the Gate documentation on
setting up dose actors. This may fix your empty results, though everything
will probably be zero as your table is listed as air.

Best,

Ben

On Wed, Jul 5, 2017 at 5:43 PM, Emmanuel Marfo <
emmanuel.marfo at postgrad.otago.ac.nz> wrote:

> Hi Benjamin,
>
> Your first point is well noted.
>
> For the second part
>
> >>>Your second problem is the phantom and your scanner should not be
> attached. Attach your phantom to the world and then you don't have to worry
> about counter rotating it. This was causing me problems as well.
>
>
> Initially my phantom was attached to the world and the scanner was
> rotating around it. I attached my DoseActor to the phantom and it gave me
> empty results. I then attached the phantom with the DoseActor to the
> scanner and it gave me some results. Because the phantom was rotating also
> I applied negative rotation to it.
>
> I will really appreciate it if you can help me solve my second problem?
> Thanks
>
> Cheers,
>
> Emmanuel
> ------------------------------
> *From:* Kopchick, Benjamin <kopchickbp at email.gwu.edu>
> *Sent:* Thursday, 6 July 2017 3:29:16 a.m.
> *To:* Emmanuel Marfo
> *Cc:* gate-users at lists.opengatecollaboration.org
> *Subject:* Re: [Gate-users] Helical Movement
>
> Hey Emmanuel,
>
> It looks like your helical movement is fine, just your world is too small
> or you are extending too far. Based on how geometries are handled, your
> world extends from 40 cm to -40 cm in the z-direction. However, with a
> quick calculation, you are moving your phantom 0.9 mm/s for 720 s, which
> places it 64.8 cm in the z-direction, which is outside your world. Your
> second problem is the phantom and your scanner should not be attached.
> Attach your phantom to the world and then you don't have to worry about
> counter rotating it. This was causing me problems as well. I made these two
> changes, and your program runs fine.
>
> Best,
>
> Ben Kopchick
> Ph.D. Student
> The George Washington University
> Department of Physics
>
> On Tue, Jul 4, 2017 at 3:53 AM, Emmanuel Marfo <
> emmanuel.marfo at postgrad.otago.ac.nz> wrote:
>
>> Hi Gate-User,
>>
>> I have been trying to incorporate helical movement into my simulation. I
>> have a gantry that rotates around a phantom. The Phantom also has
>> translational movement as the gantry rotates around it. During simulation
>> the translational movement of the phantom causes it to go beyond the world
>> volume bringing the run to a halt. I am finding it difficult to do this
>> helical movement. I have attached a simple file so that any willing to help
>> me could have a look at it. Please, I need your help. Thanks.
>>
>> Best regards,
>>
>> Emmanuel Marfo
>>
>> University of Otago
>>
>> Student
>>
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>> Gate-users at lists.opengatecollaboration.org
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>>
>
>
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