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

[erkang]

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.

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