[Rtk-users] How to fill an outer space with air in forward projection

[Simon Rit]

Hi,
RTK forward projector only does the line integral of the volume. You should
try to find what Plastimatch does exactly but I would try to add the
following operations:
- Make air at 0  (if HU, air is at -1000 so add 1000 to your input volume)
- forward project
- multiply by -1 and take the log
All these operations can be pipelined with ITK filters except the forward
projection.
It sounds like a very nice project, thanks for doing it and please let us
know how it goes.
Simon

On Fri, Nov 20, 2020 at 7:40 AM pmkclnl at yandex.ru <pmkclnl at yandex.ru> wrote:

> Hello,
>
> I'm making a DRR computation module for 3D Slicer and now the module
> uses plastimatch reconstruct library for that purpose.
>
> As a alternative i think it will be good to use RTK forward projection
> calculation as well. I've made a simple example and the first question
> is how to fill the outer space of CT volume data to compensate borders
> so the DRR image background was uniform, or is there any other way to do
> such task?
>
> Source file, reconstructed images using plastimatch and RTK in attachment.
>
> Original DICOM data (anonymized):
> https://github.com/MichaelColonel/SlicerTestData.git
>
>
> Best regards,
>
> MIkhail Polkovnikov
>
>
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