[Insight-users] Re: some questions on BSpline Registration

[he smth]

thank you very much! but I have still puzzles


>----- Original Message -----
>From: Yixun Liu <yxliu at fudan.edu.cn>
>Date: Mon, 19 Jul 2004 20:18:11 +0800
>Subject: Re:some questions on BSpline Registration
>To: insight-users at itk.org, kingaza at gmail.com

>Hi,
>I answer your question 2 ,3 and 4
 
>2.origin is the start point of the control grid, spacing is the
actual space between >two control points. You need the origin, spacing
and the size to definitely set the >control gird.
If the file format is *.mhd or others, I think you are right. but for
dicom file, the origin and spacing are based on the process of
imaging. and they are often NOT integers.
 
>3.generally, you need 2^(2*D) control points(D denotes the
Dimension), so the >number of the parameters are D * 2^(2*D)

In the answer from Luis, :
The parameters of a BSpline deformable transform are the displacement
values in all the nodes the grid. That becomes
     Number of Parameter = Number of Nodes * Image Dimension

>4. the size of the grid will impact heavily on the run time of the
Optimizer, so you >need trade between the registration precision and
the run time
Could you tell me the details.
I can't catch it.
 
>Hope it help!
 
>Regards,
 
>Yixun liu