|Message: Re: Speed Difference between Parameterised and Replica?||Not Logged In (login)|
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In case the phantom is homogeneous, a replica will be a good implementation for a phantom. There is no overhead in memory (which can exists for simpler 3-d parameterisations). It was not clear whether you are making a simple 1-d slicing or creating 3-d voxels. Replicas will be fine for either, but moving to a non-homogeneous setup is only possible for parameterised volumes. An in the latter case (of 3d voxels) there are significant benefits in memory use in using nested parameterisations. But since the volume is homogeneous you can also avoid subdiving your volumes, if you take care to deposit the energy in your sensitive volume. In particular instead of putting all the energy deposited along the step at one point (it is meant to represent continuous energy loss, spread along the step), you will need to spread the deposit between artificial cells that you create only for the purpose of scoring the energy. Since your steps will not stop at volume boundaries, the simulation will be much faster. Could you please give some more information about your application, to enable better feedback. Best regards, John. Ryan wrote: > *** Discussion title: Geometry > Email replies to PublicHyperNews@slac.stanford.edu must include: > In-Reply-To: <"/geometry/755"@geant4-hn.slac.stanford.edu> > Subject: Re: Speed Difference between Parameterised and Replica? > > Hi, > > I'm implementing a homogeneous voxel phantom. Between using replicas and > parameterization, I know that replicas will save more memory. But will > there be any execution time difference between the two methods of doing > it? > > Thanks >
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