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From: Ignatius Elolansky on 22 Feb 2010 05:10
Hello:
I have to do an image subtraction: they are two head CT (with and without injected contrast material), and after subtraction, a motion correction must be done.
I don't know how to do it, the instructions mentioned control points, template matching and hill-climbing. I have selected some control points already, but I can't do anything else.
Can anybody help me, with this or another method,please?. It's important.
Thank you very much:
Ignatius
From: Dave Robinson on 22 Feb 2010 06:41
"Ignatius Elolansky" <chimela28(a)hotmail.com> wrote in message <hltl5u$j6n$1(a)fred.mathworks.com>...
> Hello:
> I have to do an image subtraction: they are two head CT (with and without injected contrast material), and after subtraction, a motion correction must be done.
> I don't know how to do it, the instructions mentioned control points, template matching and hill-climbing. I have selected some control points already, but I can't do anything else.
> Can anybody help me, with this or another method,please?. It's important.
> Thank you very much:
> Ignatius

What might be very useful to you is a very nice GUI based application that already exists within the Image Processing Toolbox. It allows you to select the control points and will then undertake an image registration of the two images so that they geometrically align, enabling you to do the analysis that you require.

Trouble is I don't have the IPT on this machine, and cannot remember what it is called - but do remember that if you type

help image registration

at the command prompt, it is relatively easy to identify the application I am referring to. Else perhaps one of the Guru's will step in and put you on the right track.

Regards

Dave Robinson
From: ImageAnalyst on 22 Feb 2010 06:53
It's called cpselect(). There is example code in the help for that
function and a long discussion in the "Image Registration" part of the
Image Processing Toolbox Contents.
From: Ignatius Elolansky on 23 Feb 2010 03:01
"Ignatius Elolansky" <chimela28(a)hotmail.com> wrote in message <hltl5u$j6n$1(a)fred.mathworks.com>...
> Hello:
> I have to do an image subtraction: they are two head CT (with and without injected contrast material), and after subtraction, a motion correction must be done.
> I don't know how to do it, the instructions mentioned control points, template matching and hill-climbing. I have selected some control points already, but I can't do anything else.
> Can anybody help me, with this or another method,please?. It's important.
> Thank you very much:
> Ignatius
I got it !
Thank you very much for your help.
Regards:
Ignatius
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