[Gate-users] Radiotherapy Example 6

[Elia Alessio]

Dear Awad,

Here my personal understanding:


1-     If you look at the main.mac file you can see that the dose to water flag is set to true (line 132). This means that the dose scored in a specific voxel (ideally with a generic material assigned) will be directly converted in dose for the same voxel but with water assigned instead.

This feature is in general very useful in case you would like to compare your results with a Treatment Planning System...



2-     I think the answer is beside the mass stopping power concept. As you said, in higher Z materials we expect higher stopping power as well, but due to the higher density the mass stopping power is actually lower compare to the mass stopping power in water. Therefore, dose deposited in lead is lower compare to dose deposited in water.

Hope this helps

Best regards,
Alessio


From: Gate-users [mailto:gate-users-bounces at lists.opengatecollaboration.org] On Behalf Of Awad Almarhaby
Sent: Montag, 22. August 2016 18:17
To: gate-users at lists.opengatecollaboration.org
Subject: [Gate-users] Radiotherapy Example 6

Dears Experts,

I have two questions regarding to radiotherapy example 6 (proton beam in a heterogeneous phantom).

1- There was only one dose actor in the main macro file named "IDD.txt", but after running the example another dose actor resulted called "IDD-Dose-to-Water" as well. I am confused between these two actors and how they were generated?

2- When higher density materials, such as lead, was  embedded at the first layer of the water phantom instead of bone , dose to higher density materials was lower than that to water which is not as expected. Dose supposed to be higher for material with higher Z numbers.

Many thanks in advance,
Awad



Sent from Outlook<http://aka.ms/weboutlook>
Disclaimer:
Please notice our E-Mail Disclaimer http://www.medaustron.at/email-disclaimer/

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20160825/e829dbb4/attachment.html>