| Fitting a bolus passage with gamma variate in IDL?? [message #23231] |
Mon, 22 January 2001 05:50  |
Sean Heukels
Messages: 25
Registered: November 1999
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Junior Member |
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Hello all.
Has someone run into having to fit a
bolus passage through a vein??
You need a mono-exponential extrapolation fit.
I heard that gamma variate fit would be the best.
But is there someone out there that did
something like this and wouldn't mind sharing some knowledge?
How can this be done in IDL?
And where do I start?
Thanks in advance, Sean Heukels
Invivomr institute, Utrecht, the Netherlands
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| Re: Fitting a bolus passage with gamma variate in IDL?? [message #23420 is a reply to message #23231] |
Mon, 22 January 2001 08:56  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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"Sean Heukels" <sean77=cuthere=@dds.nl> writes:
> Hello all.
>
> Has someone run into having to fit a
> bolus passage through a vein??
> You need a mono-exponential extrapolation fit.
> I heard that gamma variate fit would be the best.
>
> But is there someone out there that did
> something like this and wouldn't mind sharing some knowledge?
> How can this be done in IDL?
> And where do I start?
Hello Sean--
I think few of us on this newsgroup are familiar enough with medical
terminology to provide a competent answer to your question.
However, performing curve fitting is fairly straightforward in IDL.
There are a number of standard library routines (CURVEFIT being the
most popular), and I provide a curve fitting routine on my web page
which is a tad easier to use, and is a bit more stable (MPFIT and
drivers).
You must still provide the fitting function. I thought I understood
what you meant when you said "mono-exponential," but then you go on to
talk about gamma variates. IDL does have a lot of special functions
in its standard library. Suffice to say, if you can provide the
parameterized curve, IDL can fit it.
Craig
P.S. Web page at http://cow.physics.wisc.edu/~craigm/idl/idl.html
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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