[Insight-users] Q: MetaImageViewer and TripleTKID input and display differences?

[Feng Ma]

Hello,

  I am playing around with the examples provided in ITK, to import my CT 
data using metaimage format. I construct a .mhd file according to the 
suggestions in the list.

  I was able to load the CT data into TripleTKID and display it on 2D view. 
By scrolling images, everything looks fine. However, when I tried to load it 
use MetaImageViewer, I got the error:

NDims required and not defined.
MetaObject: Read: MET_Read Failed
MetaImage: M_Read: Error parsing file
MetaImage: Read: Cannot parse file
Problems reading file format

  while the .mhd file looks like this:

% more LV103.mhd
NDims = 3
DimSize = 512 512 311
ElementSpacing = 0.61 0.61 1.25
Position = 0 0 0
ElementByteOrderMSB = False
ElementType = MET_USHORT
HeaderSize = -1
ElementDataFile = LIST
LV00010300_000.dcm
LV00010300_001.dcm
LV00010300_002.dcm
LV00010300_003.dcm

  Seems that TripleTKID use a special meta image IO library to read meta 
images, different from the more general usage in MetaImageViewer. Which one 
is better to use?

  Then I copy the code in TripleTKID into MetaImageViewer, using the 
non-general metaimage reader provided in utilities library, as TripleTKID 
did. This time, I was able to load the data and display it. But problem is 
the displayed images are upside down. I checked the code, both views use 
GLSliceView as the base class. This is my second question: Why the 
MetaImageViewer display images differently from TripleTKID? By the way, if I 
load simulated brainweb data, there is no difference. !??

  Finally, can I have a quick guide on how to code my specific image IO lib? 
I think I read some answers in the list, but I can not find it again.

  Thanks a lot.

Best regards,

-Feng


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