[Gate-users] ImageNestedParametrisedVolume and TranslateTheImageAtThisIsoCenter: placing CT at RTPlan Isocenter in GATE

Tue Mar 23 11:06:11 CET 2021

Hi Greg,

I'm also interested to hear how others do this. I had to write some code for this about a year ago, and didn't find it a simple task as I was brand new to Gate. I've attached some notes that I made back then, which I hope are of some help and don't just confuse matters for you. I'm happy to share the code as well that generates my simulation files.

If anyone thinks my approach was way too convoluted and has a simpler method, I'd love to hear it.

Steve
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Today's Topics:

   1. ImageNestedParametrisedVolume and
      TranslateTheImageAtThisIsoCenter: placing CT at RTPlan Isocenter
      in GATE (G Tom)
   2. Fig1 (王天泉)

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Message: 1
Date: Tue, 23 Mar 2021 00:45:55 -0400
From: G Tom <gregthom992 at gmail.com>
To: Gate-users <gate-users at lists.opengatecollaboration.org>
Subject: [Gate-users] ImageNestedParametrisedVolume and
        TranslateTheImageAtThisIsoCenter: placing CT at RTPlan Isocenter in
        GATE
Message-ID:
        <CAFh_-OOimSFczGceTNhVWfTNJOAKGXpccAtLcZPAVms4yipnrw at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

HI
I am using ImageNestedParametrisedVolume  to place my ct dataset in GATE.
I have two questions:

1) I don't understand how GATE places the volume. For instance To place my
volume with the origin at the desired isocenter I export the plan from
Eclipse planning system and I use sitk to get the isocenter tag : (300a,
012c) Isocenter Position                  DS: [0, -7.1054274e-15, 0]
(basically 0,0,0. That means I use
/gate/patient/geometry/TranslateTheImageAtThisIsoCenter  0.  0 0. mm. This
doesn't seem right to me as GATE does not account for the
ImagePositionPatient and Orientation ? I use vv to convert the diom ct to
mhd.

2) How are people placing volumes accurately in GATE from a treatment
planning system RT Plan file ? Please show some step by step if you can.

Thanks
GT
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Message: 2
Date: Tue, 23 Mar 2021 16:38:05 +0800 (GMT+08:00)
From: 王天泉 <wangtq17 at lzu.edu.cn>
To: gate-users at lists.opengatecollaboration.org
Cc: zhangqh19 at lzu.edu.cn
Subject: [Gate-users] Fig1
Message-ID: <b95a18b.5df2.1785e3be096.Coremail.wangtq17 at lzu.edu.cn>
Content-Type: text/plain; charset="utf-8"

Dear Gate-users,
  I'm confused when I simulated the Dosimetry generated by F-18.
  When I defined the source as a "e+" in a Cylinder geometry,
  the result seems it dose not have influence on the other region, as shown in appendix Fig1.png.

  When I defined the source as beam, a 0.511 MeV gamma ray, radiate the phantom, the result shows better.
  It had influence on a long region, as shown in appedix Fig2.png.

  So confused am I, thanks everyone!
  Your Sincerely,
  Quan
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