Detectors radius in Redbird
Charly Caredda
Dear Prof. Fang,
Thank you for sharing Redbird; this tool is very powerful!
I’m not sure if I’m posting in the correct group, as I couldn’t find a dedicated group for Redbird users. I would like to ask whether it is possible to create a detector with a specific radius in Redbird. From the documentation, it seems detectors are defined by their position (cfg.detpos).
Many thanks for your help.
Best regards,
Charly
Qianqian Fang
hi Charly,
before we have a dedicated redbird mailing list, feel free to use either mmc-users or mcx-users mailing list for questions
yes, redbird's detector readings are point-based interpolations.
They do not have a radius lke in mcx/mmc. Because the finite
element method used in redbird uses linear basis functions for
each element and interpolations are built-in to the forward
models, in a way, it is not necessary for redbird's detector to
have a radius in order perform averaging.
another difference is that redbird's detector values (detphi) are fluence values (interior light); they are different from the diffuse reflectance that mcx/mmc produced from the detected photons (exiting light) but they are related (see https://github.com/fangq/mcx/blob/master/mcxlab/examples/demo_diffuse_reflectance_validation.m).
for the purpose of DOT reconstructions, the conversion between fluence and dref is done as part of the calibration.
let me know if these are clear.
Qianqian
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Charly Caredda
Thank you for your answer, it makes sense to me.
If I understand correctly, Redbird’s detector values can be converted into diffuse reflectance using the calibration procedure described in Section 2.6 of the manual: https://github.com/fangq/redbird/blob/master/doc/Redbird_manual.pdf
Charly