Uniform dose inside the target
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Samuele Cavinato
Oct 21, 2019, 6:12:32 PM10/21/19
to CERR FORUM
Hello everybody!
I'm new with CERR and I have some problem to understand the dose calculation it applies to the target.
I'm working with one of the test examples, the prostate.
I can't understand the reason why the dose distribution inside the target is always uniform, independently on the beam configuration. I've tried, for example, with two beams, one at 0° and one at 90° and I would expect it to be non uniform, but it doesn't happen! Is there something more I need to know about?
If anyone could help me to understand I would be very glad!
Thank you!
I'm new with CERR and I have some problem to understand the dose calculation it applies to the target.
I'm working with one of the test examples, the prostate.
I can't understand the reason why the dose distribution inside the target is always uniform, independently on the beam configuration. I've tried, for example, with two beams, one at 0° and one at 90° and I would expect it to be non uniform, but it doesn't happen! Is there something more I need to know about?
If anyone could help me to understand I would be very glad!
Thank you!
Aditya Apte
Oct 22, 2019, 12:08:08 PM10/22/19
to cerr-...@googlegroups.com
Can you please provide more detIails regarding the settings used? The beamlet weights default to 1. Here is documentation on applying beamlet weights to the influence matrix:
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Samuele Cavinato
Oct 22, 2019, 1:15:39 PM10/22/19
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Hello,
Thank you for your answer. I'll briefly explain what I do.
1) I load the plan prostex_9may03.mat.bz from the folder CERR/Unit_Testing/data_for_cerr_tests/CERR_plans
2) From the menu IMRT I create a new IMRTP plan with two beams: the first with gantryAngle 0°, the second with gantryAngle 90°. You can find the screenshot of the IMRTP window in attachment.
3) As you can see, I decide to work with the PTVHD as target and the BLADDER as OAR.
4) I click on "Go" and then on "Show", in order to generate the dose map.
Then I go on the "Metrics" panel in order to visualize the DVH for both the BLADDER and the PTVHD.
You find the result in attachment.
The point is that I cannot understand why the dose distribution inside the target is so uniform considering that I'm using two beams at 0 and 90 degrees and I'm not performing any optimization. Maybe there's something I'm missing, but I need your help to understand what.
I hope it's clear now.
Thank you very much,
Samuele
Thank you for your answer. I'll briefly explain what I do.
1) I load the plan prostex_9may03.mat.bz from the folder CERR/Unit_Testing/data_for_cerr_tests/CERR_plans
2) From the menu IMRT I create a new IMRTP plan with two beams: the first with gantryAngle 0°, the second with gantryAngle 90°. You can find the screenshot of the IMRTP window in attachment.
3) As you can see, I decide to work with the PTVHD as target and the BLADDER as OAR.
4) I click on "Go" and then on "Show", in order to generate the dose map.
Then I go on the "Metrics" panel in order to visualize the DVH for both the BLADDER and the PTVHD.
You find the result in attachment.
The point is that I cannot understand why the dose distribution inside the target is so uniform considering that I'm using two beams at 0 and 90 degrees and I'm not performing any optimization. Maybe there's something I'm missing, but I need your help to understand what.
I hope it's clear now.
Thank you very much,
Samuele
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