[Mristudio-users] apply transformation to landmarkers & command file
Yi Jiang
yj3 at duke.edu
Wed Feb 17 11:05:27 EST 2010
Hello Xin,
Thank you! I looked at the transformation matrix. Overall it looks
reasonable (i.e. I think my reading format of the matrix is correct. I was
able to use the vector information to reasonably map land marks I chose).
But I found the value of the vector somehow ranges from e.g.
(-40~540)x(-30~270)x(-20~280) instead of (0-511)x(0-255)x(0-255) I would
expect. What do those out of range (out of (0-511)x(0-255)x(0-255) ) values
mean?
Best,
Yi
----- Original Message -----
From: "Xin Li" <xli16 at jhmi.edu>
To: "Yi Jiang" <yj3 at duke.edu>; "DTI Studio, ROI Editor, Landmarker
Questions/Support" <mristudio-users at mristudio.org>
Sent: Wednesday, February 17, 2010 10:01 AM
Subject: Re: [Mristudio-users] apply transformation to landmarkers & command
file
Hello Yi,
If your image size is 512x256x256, the vector should be
(0-511)x(0-255)x(0-255)
Xin
----- Original Message -----
From: Yi Jiang <yj3 at duke.edu>
Date: Wednesday, February 17, 2010 8:44 am
Subject: Re: [Mristudio-users] apply transformation to landmarkers & command
file
To: "DTI Studio, ROI Editor, Landmarker Questions/Support"
<mristudio-users at mristudio.org>
> Hello, Xin,
>
> Thank you very much for the information.
>
> I have one more question: does the vector indicating new location
> start from
> 0 or 1? That is: if my image size is 512x256x256, the vector should
> be
> (0-511)x(0-255)x(0-255) or (1-512)x(1-256)x(1-256)?
>
> Thank you!
>
> Best,
> Yi
>
>
> ----- Original Message -----
> From: "Xin Li" <xli16 at jhmi.edu>
> To: "susumu mori" <susumu at mri.jhu.edu>; "Yi Jiang" <yj3 at duke.edu>;
> "DTI
> Studio, ROI Editor, Landmarker Questions/Support"
> <mristudio-users at mristudio.org>; "Jiangyang Zhang" <jzhang3 at jhmi.edu>
> Sent: Monday, February 01, 2010 10:22 AM
> Subject: Re: [Mristudio-users] apply transformation to landmarkers &
> command
> file
>
>
> Hello Yi,
>
> As Susumu said, transformation matrices contain vectors at each
> coordinate,
> indicating where is the new location. The structure is Vector (x, y,
> z) x
> X-dimension x Y-dimension x Z-dimension. You may write matlab code to
>
> extract the vector information.
>
>
> Xin
>
>
>
>
>
> ----- Original Message -----
> From: susumu mori <susumu at mri.jhu.edu>
> Date: Saturday, January 30, 2010 8:29 am
> Subject: Re: [Mristudio-users] apply transformation to landmarkers &
> command
> file
> To: Yi Jiang <yj3 at duke.edu>, "DTI Studio, ROI Editor, Landmarker
> Questions/Support" <mristudio-users at mristudio.org>, Xin Li
> <xli16 at jhmi.edu>,
> Jiangyang Zhang <jzhang3 at jhmi.edu>
>
>
> > Hi Yi,
> >
> > On Fri, Jan 29, 2010 at 5:25 PM, Yi Jiang <yj3 at duke.edu> wrote:
> >
> > > Hello, dear all,
> > >
> > >
> > >
> > > I have two questions and am wondering if someone can help.
> > >
> > >
> > >
> > > 1. I have already had a transformation matrix to map the subject
> > image
> > > onto the template image, which was generated by combining AIR
> > rigid, AIR
> > > affine, and LDDMM matrix. I want to define some landmarkers on
> > the subject
> > > image, and apply the transformation matrix to the landmarkers
> > (to see their
> > > corresponding location on the template image). How can I do that?
> > >
> > >
> > I think this is exactly what the K and H maps are. I need
> > confirmation from
> > Xin, but in my understanding, these transformation matrices
> contain
> > vectors
> > at each coordinate, indicating where is the new location. If I'm not
> > mistaken, it is Vector (x, y, z) x X-dimension x Y-dimension x
> > Z-dimension.
> > There must be a way to extarct the "Vector" information at the
> specified
> > coordinate.
> >
> > >
> > >
> > > 1. I would like to use the “load command file” function. I will
> > do AIR
> > > linear rigid transformation, AIR linear affine transformation,
> > image format
> > > change to byte, automatic intensity correction by histogram,
> and
> > 2-channel
> > > LDDMM. Is it possible to put all these into one command file?
> If
> > yes, can
> > > anyone give me an example file?
> > >
> > > I believe the command file is only for the functions within the
> > same box,
> > including byte-integer-float conversion, axial-sagittal-coronal
> > conversion,
> > resampling, etc. They don't include transformation functions. We are
> > working
> > on automation, which will take several months. Meanwhile, I believe
> > it is
> > good idea to use the current way, which forces you to check the
> > result after
> > each step. Transformation sometimes does silly things. Some images
> > may have
> > quality problems. You may want compare different methods (e.g. Mutual
> > Info
> > linear transformation vs AIR, intensity correction methods, contrast
> > of
> > choice). I think it's very important to get a feel about your data
> > and each
> > transformation step. Also, depending on pathology, the transformation
> > strategy may change. Some disease groups have severe intensity
> > changes (e.g.
> > stroke), some have severely enlarged ventricles. You may find the
> same
> > methods may work for one but not the other. Automation is still a
>
> > difficult
> > matter for transformation-based analysis.
> >
> >
> > >
> > >
> > > Thank you very much!
> > >
> > >
> > >
> > > Have a nice weekend!
> > >
> > >
> > >
> > > Best
> > >
> > > Yi
> > >
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > Mristudio-users mailing list
> > > Mristudio-users at mristudio.org
> > >
> > > Unsubscribe, send a blank email to:
> > > Mristudio-users-unsubscribe at mristudio.org
> > >
> > >
>
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