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Forum: Geometry
Re: None Performance of homogeneous voxelised phantom (Sven Lotze)
Date: 09 Nov, 2007
From: michel maire <michel maire>

User Sven Lotze wrote:

>> On the other hand, as I have to limit the step length as
>> done in TestEM11/12 according to voxel size, doesn´t that
>> lead to the same problems as my original geometry with 
>> small volumes limiting the steps?

   You can limit the step only for charged particles, not for gamma

>> Looking at TestEM11/12, for the deposited energy in each 
>> step a position along the step is randomly chosen before
>> filling it to a histogram. Why is that necessary if max.
>> step size is limited corresponding to voxel (=bin) size 
>> anyway? Why not deposit it at the center of the step?

  It is not necessary : it is redundant. But if you relaxe the constraint
  of stepmax, random energy deposition will continue to assure more on less correct 
  energy deposition profile. It is probably the fastest way to proceed, but you must
  check at least once than accurancy is preserved.

  Indeed, TestEm11 was designed to illustrate various way to get energy profile (histo 1):

  - by randomizing energy deposition
  - by limiting the step size either 'by hand' (run01.mac) 
    or by geometry (run02.mac)


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1 None: Re: Performance of homogeneous voxelised phantom   (Sven Lotze - 27 Nov, 2007)
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