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None Re: some mistake in PDD curve only in the build-up region  

Forum: Medical Applications
Re: Question some mistake in PDD curve only in the build-up region (Jaafar EL Bakkali)
Re: None Re: some mistake in PDD curve only in the build-up region (Youming Yang)
Re: None Re: some mistake in PDD curve only in the build-up region (Jaafar EL Bakkali)
Date: 23 Jun, 2012
From: Youming Yang <Youming Yang>

Hi Jafaar,

It appears my previous response didn't post.

What are you using to take your experimental measurements? Also, what is your physical source?

If your energy spectrum (as well as its physical extent) is a gaussian, there is a good possibility that you are not modeling the spectrum properly.

Additionally if you are just using an ion chamber for your PDD measurements, you need to be very careful in the steep-gradient buildup region of the PDD.

However if you are using the PDD from the commissioning of a Linac, those experimental values should be accurate, and the error will most likely be in your simulation somewhere.

Ming

On Fri, 22 Jun 2012 20:19:01 GMT, Jaafar EL Bakkali wrote:

> Thank you for your reply,
> for scoring i use sensitive detector and readout geometry for homogenous
> phantom in air .
> for physics package i use livemore and for cut value ,i choose 1mm for
> e-/e+ and 10 mm for photons .
> the source is gaussien ( for energy and position) .
> 

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1 None: Re: some mistake in PDD curve only in the build-up region   (Jaafar EL Bakkali - 24 Jun, 2012)
(_ None: Re: some mistake in PDD curve only in the build-up region   (Youming Yang - 24 Jun, 2012)
(_ None: Re: some mistake in PDD curve only in the build-up region   (Jaafar EL Bakkali - 24 Jun, 2012)
(_ None: Re: some mistake in PDD curve only in the build-up region   (Youming Yang - 24 Jun, 2012)
(_ None: Re: some mistake in PDD curve only in the build-up region   (Jaafar EL Bakkali - 26 Jun, 2012)
(_ None: Re: some mistake in PDD curve only in the build-up region   (Youming Yang - 01 Jul, 2012)
(_ None: Re: some mistake in PDD curve only in the build-up region   (Jaafar EL Bakkali - 03 Jul, 2012)
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