[Insight-users] Q about header file of data download from Liver challenge 2007

[Dženan Zukić]

Registering a team is available to anyone, however.

On Thu, May 24, 2012 at 9:36 AM, Sergio Vera <sergio.vera at alma3d.com> wrote:

> Luis,
> about your question regarding the public availability of the data:
>
> SLiver07 challenge data is free to download once you have registered your
> team  and signed a document that states that you cannot share or show the
> data to anyone outside of your team. (http://www.sliver07.org/rules.php)
>
> This agreement has been used in some other MICCAI challenges as well.
>
> regards
>
> On Thu, May 24, 2012 at 3:13 AM, Luis Ibanez <luis.ibanez at kitware.com>wrote:
>
>>
>> Hi ekyaya,
>>
>>
>> Line 199   of  itkImageBase.hxx
>>
>>             says that your suspicions are well-founded:
>>
>>     this->m_IndexToPhysicalPoint = this->m_Direction * scale;
>>
>> as well as lines 94-99 in the itkImageTransformHelper.h
>>
>> 94   inline static void TransformIndexToPhysicalPointCol(
>> 95     const MatrixType & matrix,
>> 96     const IndexType & index, DoublePoint & point,
>> 97     const UniqueTypeBoolFalse &)
>> 98   {
>> 99     point[R] = point[R] + matrix[R][C] * index[C];
>>
>>
>> The matrix in the MetaImage headers shouldn't have
>> combined the spacing with the direction cosines. This
>> composition is done for you in line 99 of the ImageBase
>> class.
>>
>> You may want to contact the organizers of the
>> challenge and ask for clarification.
>>
>>
>>    BTW, Is this Challenge data available to the public ?
>>
>>
>>      Thanks
>>
>>
>>            Luis
>>
>>
>> -------------------------
>>
>> On Mon, May 21, 2012 at 6:14 PM, erkang <ekyaya at gmail.com> wrote:
>>
>>> Hi everyone:
>>>
>>> I play with the meta data downloaded from Liver challenge 2007. However,
>>> I
>>> confused with the "TransformMatrix" item in the header file.
>>>
>>> One example of the header file is as following:
>>>
>>> ObjectType = Image
>>> NDims = 3
>>> BinaryData = True
>>> BinaryDataByteOrderMSB = False
>>> TransformMatrix = 0.74219 0 0 0 0.74219 0 0 0 1.5
>>> Offset = 0 0 0
>>> CenterOfRotation = 0 0 0
>>> ElementSpacing = 0.74219 0.74219 1.5
>>> DimSize = 512 512 183
>>> AnatomicalOrientation = ???
>>> ElementSize = 0.58594 0.58594 1
>>> ElementType = MET_SHORT
>>> ElementDataFile = liver-orig001.raw
>>>
>>> I doubt that the header files of these data are not correct. I check the
>>> metaIO in ITK. ITK does first read the direction (TransformMatrix ) and
>>> then
>>> multiplied by spacing. I test it in ImageFileReader and transform of the
>>> loaded image is 0.74219*0.74219 0 0 0 0.74219*0.74219 0 0 0 1.5*1.5.
>>>
>>> But, I would like to guess the "TransformMatrix" of the header file is
>>> TransformMatrix = 1 0 0 0 1 0 0 0 1. And after multiplied by spacing, the
>>> actual transform matrix is 0.74219 0 0 0 0.74219 0 0 0 1.5.
>>>
>>> Is that correct? Or what's the best way to load these data? Thanks.
>>>
>>> --
>>> View this message in context:
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>>> Sent from the ITK Insight Users mailing list archive at Nabble.com.
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>>
>>
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>
>
> --
> Sergio Vera
>
>  Alma IT Systems
>  C/ Vilana, 4B, 4º 1ª
>  08022 Barcelona
>  T. (+34) 932 380 592
>  www.alma3d.com
>
> _____________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Kitware offers ITK Training Courses, for more information visit:
> http://www.kitware.com/products/protraining.php
>
> Please keep messages on-topic and check the ITK FAQ at:
> http://www.itk.org/Wiki/ITK_FAQ
>
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