[Insight-users] KullbackLeiblerCompareHistogramImageToImageMetric

[jef vdmb]

Hi,

I think I understand now what the idea is, but I still have some questions? 
Is the first joint histogram (acquired manually) representative for MR- US 
registration in general?

Say I have registered (manually) a 2D US and the 3D MR. Their joint 
histogram can now be caculated.

-Is this histogram then usefull for registrations of other images that are 
located in a similar position of the fixed or moving image?

- Can it be used for registration using the same moving or fixed image, in 
the case that the other image is located in another position?

- Would it be usefull (representative) to use for ANY MR-US registration 
(with the same kind of MR and US images) no matter where they are located?


I hope I have made my doubts clear,

Thank you very much for you swift reply Karthik,

Jef


>From: Karthik Krishnan <Karthik.Krishnan at kitware.com>
>To: jef vdmb <jvdmb at hotmail.com>, ITK <insight-users at itk.org>
>Subject: Re: [Insight-users] 
>KullbackLeiblerCompareHistogramImageToImageMetric
>Date: Wed, 20 Apr 2005 20:46:23 -0400
>
>Thanks for mentioning. The notation in the software guide is probably 
>confusing.
>
>p_A(i) is intended to represent the joint histogram of the fixed image (say 
>CT) and the first reference image (say US). Assume that you've somehow 
>registered them (say manually).   p_B(i) is intended to represent the joint 
>histogram of the training image(s), say another US image which you wish to 
>register to the fixed CT image just the same way the first reference image 
>was registered. So the goal is to minimize the KullbackLeibler distance 
>between the two joint histograms. I guess it will be clearer if the 
>notation were changed from p_A(i) to p_ref(x,y)  and p_B(i) to 
>p_training(x,y').
>
>Thank you
>kk
>
>jef vdmb wrote:
>
>>Hi,
>>
>>I am trying to find out which metric behaves the best for my multi modal 
>>registration problem. The images are a 2D US and a 3D MR (should you have 
>>any suggestions, based on their modality).
>>
>>I am plotting the metric value for all multi modal metrics available, but 
>>I am having problems understanding how to use the 
>>KullbackLeiblerCompareHistogramImageToImageMetric. In the SoftwareGuide, 
>>it seems you only need your two images. When I go to the Doxygen pages 
>>however, a "training histogram" is mentioned.
>>
>>Could you please clarify the use of this metric, any parameters that need 
>>to be set (besides epsilon), or known preprocessing improvements (like 
>>normalisation).
>>
>>Thank you,
>>
>>Jef
>>
>>
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>