"Finding" Anatomy in DRR

[Andrew Fields]

Hi Plastimatch community, 

I am having trouble creating a DRR from a CT volume that includes the desired patient anatomy within the DRR's field of view. I identified a desirable isocenter in RAS using Slicer and converted it to LPS, but I am unsure how to configure nrm and vup. I tried using the nrm and vup values listed in the "Plastimatch DRR command arguments (read only)" window in Slicer's "DRR Image Computation" module, but when I input those values in the Plastimatch command prompt, the resulting .pfm is black. I have played around with other nrm and vup combinations, but I don't know how to do it systematically. 

Does anyone have recommendations? I can't use Slicer's UI for my application because I need the resulting .pfm file. 

Thanks, 

Andrew 

[Sharp, Gregory C.]

Hi Andrew,

 

For isocentric imaging, the default nrm is pointing toward the source, and the default vup is (0,0,1).  These are reasonable defaults; the detector will be opposite the source and square wrt the CT.  If you are doing non-isocentric imaging, please provide a bit more description.

 

Can you please verify the CT geometry?  The CT geometry can be found by running "plastimatch header" on the CT image.  Then, please give an example of command line parameters you think should work but isn’t working.

 

Greg

 

From: plast...@googlegroups.com <plast...@googlegroups.com> On Behalf Of Andrew Fields
Sent: Monday, November 28, 2022 10:12 PM
To: Plastimatch <plast...@googlegroups.com>
Subject: [Plastimatch] "Finding" Anatomy in DRR

 

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