[Insight-users] Freehand US-US registration

[Luis Ibanez]

Hi Sam,

Registering Freehand 2D Ultrasound slices that can be taken
in arbitrary positions in 3D space is a very hard problem.

If you still have the option of choosing another project,
jump to it !   :-)


If it is too late for dismissal, here are some options
that you may want to consider.


1) If your data is comming in polar coordinates,
    start by resampling it and generating a classical
    image in a rectilinear grid. For that you can use
    the AzimuthElevationToCartesionTransform
http://www.itk.org/Insight/Doxygen/html/classitk_1_1AzimuthElevationToCartesianTransform.html

    and the ResampleImageFilter, that you wiil find
    described in detail in the ITK Software Guide

       http://www.itk.org/ItkSoftwareGuide.pdf


2) One of the common approaches for this problem is to
    track the Ultraound probe. This tracking has been
    done in three forms

       - Optical tracking
       - Magnetic tracking
       - Mechanical tracking (still freehand)

    in that context at least you get from the tracking
    system the orientation and position of the Ultrasound
    probe.



If this makes you feel better:  The fact that your is a very
hard problem is somehow compensated by the fact that it is an
extremly important one. Empowering Ultrasound exams with the
capability for reconstructing data in 3D will be make possible
to improve diagnosis and treatement. The potential impact of you
application will me much larger that those based on modalities
such as CT and MRI.



Regards,


    Luis


--------------------
Sam Theisens wrote:

> Hi everyone,
> 
>  
> 
> I’m a newbie to ITK and would like to register 2 freehand 3D ultrasound 
> datasets. The data consists of slices with arbitrary orientation (they 
> may even intersect sometimes). This presents me with some questions:
> 
> -          What is the proper way in ITK to represent this data?
> 
> -          Does the data need to be resampled? If yes, how?
> 
> -          Has anybody got experience with this problem? If yes, do you 
> know any specific successful methods for registering this type of data?
> 
> Any help on this is welcome. Thanks in advance!
> 
>  
> 
> Sam Theisens
> 
>  
> 
> 
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