[Rtk-users] Forward projector output discrepancy

[Brandon LaCava]

No worries, thanks for the quick response.

Cheers,
Brandon

On Wed, Aug 14, 2019 at 8:16 AM Simon Rit <simon.rit at creatis.insa-lyon.fr>
wrote:

> Hi Brandon,
> Thanks for reporting the weird behavior. This is a bug, you're trying to
> project with a parallel geometry and the Cuda forward projector does not
> support parallel geometry. I have fixed the code and you should now get the
> expected exception, see this patch
> <https://github.com/SimonRit/RTK/commit/b433503bcd38bf8b75bbd0e37fa009d0486228f1>
> .
> Sorry about that...
> Simon
>
> On Tue, Aug 13, 2019 at 8:04 PM Brandon LaCava via Rtk-users <
> rtk-users at public.kitware.com> wrote:
>
>> Hi. I'm getting vastly different outputs from the Joseph forward
>> projector vs. Cuda, given the exact same inputs. I'm hoping someone has any
>> idea why. Here's some sample images:
>>
>> 1. Joseph
>>
>> [image: drr_Jospeph.png]
>>
>> 2. Cuda
>>
>> [image: drr_CudaRayCast.png]
>>
>> The general orientation looks the same, but the FOV is wildly different.
>> I've attached a small stripped-down rtkforwardprojections.cxx which was
>> used to generate these images. Literally the only difference between the
>> two runs is the projector type. Everything else is identical. Input is from
>> a CT MHD, output to PNG. Same result on Windows and Linux.
>>
>> Any help here would be appreciated. Thanks!
>>
>> Cheers,
>> Brandon
>>
>>
>>
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-- 

*Brandon LaCava*
Senior Software Engineer

*Mevion Medical Systems*
300 Foster Street
Littleton MA 01460
+1.978.540.1680 (office)

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