[Insight-users] Image registration - 2 different initializati ons

[Luis Ibanez]

Hi Radhika,


Sorry... still unclear.


The two initialization values that you
posted in your email look the same to me.
http://www.itk.org/pipermail/insight-users/2004-January/006280.html


Transform center after Initializer -2.34973  225.964  219.384

            versus

Transform center after Initializer -2.34973  225.964  219.384


                    and


Initial parameters [0, 0, 0, -0.0650073, 1.4008, -2.19123]

             versus

Initial parameters [0, 0, 0, -0.0650073, 1.4008, -2.19123]



Maybe a copy/paste error in your email ?




Question:

    The raw images that you saved and
    then converted to Analyze format,
    are they the original DICOM series
    that you are trying to register ?

    or are they the result of the registration
    performed on the DICOM images ?




Thanks


    Luis




--------------------------------
Radhika Sivaramakrishna wrote:

> Hi Luis,
> Actually the images are 3D and are DICOM series.
> As a matter of fact, I do not get the same result.
> I get different results.
> I get the first output for center of rotation, when I run
> the registration directly on the DICOM series, however
> I get the second output for center of rotation when I run
> The same algorithm on the Analyze images.
> Hope this clarifies things.
> Thanks
> Radhika
> 
> 
> -----Original Message-----
> From: Luis Ibanez [mailto:luis.ibanez at kitware.com]
> Sent: Thursday, January 15, 2004 10:58 AM
> To: Radhika Sivaramakrishna
> Cc: 'insight-users at itk.org'
> Subject: Re: [Insight-users] Image registration - 2 different 
> initializations
> 
> 
> Hi Radhika,
> 
> I didn't understand your question.
> 
> According to your email, you are doing
> registration between two 2D images.
> 
> When you read the images from DICOM format
> you get one registration result.
> 
> and if you convert the DICOM to raw and
> then to Analyze format...
> 
>     then you get the *same* result.
> 
> 
> Why is this a bad thing ?
> 
> 
> 
>    Luis
> 
> 
> 
> ------------------------------------
> 
> Radhika Sivaramakrishna wrote:
> 
>  > Hi Luis,
>  >
>  > I appear to be having a strange problem with image registration.
>  > Basically I am using the same code which you finally sent me although 
> I have
>  >
>  > combined the previous code you sent me to read a dicom series so as to
>  > directly read a pair of test-retest DICOM series. Since the data are
>  > unsigned short
>  >
>  > there is already some problem I am having, I suspect w.r.t to Endianness
>  > which I have not solved. But I am getting some other strange things 
> which
>  >
>  > I will try to describe below:
>  >
>  > 
>  >
>  > When I directly run the registration code on the 2 dicom series, then 
> I get
>  >
>  > 
>  >
>  > Transform center before Initializer 0  0  0
>  >
>  >  Transform center after Initializer -2.34973  225.964  219.384
>  >
>  > Intial Parameters =
>  >
>  > [0, 0, 0, -0.0650073, 1.4008, -2.19123]
>  >
>  >  Translationscale   = 1000
>  >
>  > 
>  >
>  > However, when I save the images as Raw format and then convert that to
>  > an Analyze file using ImageJ and then load in the two images again,
>  > using the straight version
>  >
>  > of the code you sent me, here is what I get:
>  >
>  > 
>  >
>  > Transform center before Initializer 0  0  0
>  >
>  >  Transform center after Initializer -2.34973  225.964  219.384
>  >
>  > Intial Parameters =
>  >
>  > [0, 0, 0, -0.0650073, 1.4008, -2.19123]
>  >
>  >  Translationscale   = 1000
>  >
>  > 
>  >
>  > I cant figure out what is going on. It appears the data is being read
>  > fine, because the raw files for fixed and moving image are as they
>  > should be when I view it on ImageJ.
>  >
>  > 
>  >
>  > Can you help figure out what is happening.
>  >
>  > 
>  >
>  > Thanks
>  >
>  > Radhika
>  >
>  > 
>  >
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