Planar source defects

[zubenscott]

When using the 'planar' source with mcxlab I receive a non-uniform planar illumination. Here's a plot of the normalized fluence on the surface of a phantom close to the source:

For various parameter values, I get the same 4 defects. Changing photon number, size and shape of the planar source don't appear to make them go away, nor does adding a focal length for the source. Here's the code I use,

First the setup of the phantom:

unitinmm=.2; dim = (1/unitinmm)*[60,40, 30];
volume_center = [dim(1)/2+1;dim(2)/2+1;dim(3)/2+1];
% Defining simple rectangular phantom
object_data=uint8(ones(dim(1),dim(2), dim(3)));
object_props=[0.00001 0.0 0.9 1.33;0.003 5 0.9 1.33];
fluence=illuminate_PreXion(object_data,object_props,volume_center,unitinmm);

Matlab function that defines the illuminating geometry and calls mcx:

illuminate_PreXion.txt
(save as .m file to run)

[fangq]

@zubenscott, sorry for my slow response. I just tested your script on the latest git code (nightly-build), and I do not see these artifacts. I am wondering if you can download the latest mcxlab (http://mcx.space/nightly/) and verify if this issue still present?

my screen capture is attached, generated using 5e8 photons.

[fangq]

close, no longer reproducible. if the issue remains under certain conditions, feel free to reopen.

[fangq]

this issue seems to be caused by the same problem that was fixed in Issue #31.
it is also similar to the one reported in Issue #26.

glad this was fixed. Please download the latest nightly build for Windows http://mcx.space/nightly/win64/