[IGSTK-Developers] Tcon

[Frank Lindseth]

Some comments before the Tcon:

I will try not to repeat the things that have already been said:
http://public.kitware.com/IGSTKWIKI/index.php/ 
Surgical_coordinate_changes
http://public.kitware.com/IGSTKWIKI/index.php/ 
Talk:Surgical_coordinate_changes

- Coordinate systems, transformations and spatial objects (as well as  
tracker and trackerTool) should be treated as separate concept  
whenever possible.
- Names known from IGS should be used whenever possible
- To keep it simple (and familiar) (at least for the user) should be  
a very important design criteria.
- The design should be based on how it's supposed to be used in most  
cases (95%, default behavior, with enough flexibility to deal with  
the other cases, not more)
- It would be nice to test the proposed framework on a concrete and  
common scenario (figures and pseudo-code)
- What is regarded as World / Global reference coordinate-system  
change from phase to phase in the surgical workflow:
* PreOpRefSys: e.g. the "DICOM" coord. sys. of the "master volume"
* IntraOpRefSys:  the (Patient)Ref.Frame (a special TrackerTool, most  
common, default) or the coord. sys. of the Tracker itself (e.g.  
middle of the camera for optical systems)
* (PostOpRefSys: e.g. the "DICOM" coord. sys. of one of the post. op.  
volumes)
- The sub-tree/hierarchy of image date basically moves through these  
phases (e.i. the world coord. sys. change but the sub-tree remains  
somewhat similar.
- The change from one phase to the next happens as a result of some  
kind of registration. e.g. Patient registration (from PreOpRefSys to  
IntraOpRefSys)
- Changes (in position) within the image sub tree happens as a result  
of brain-shift calibration for example.
- Well known names for well known procedures should be used:  
SetCalibration, SetPatientRegistration, etc.

- Frank



------------------------------
Frank Lindseth
Research Scientist (PhD)

SINTEF Health Research
Dept. Medical Technology
N-7465 Trondheim, Norway
Location: Olav Kyrres gt. 9, 4th floor, Trondheim

E-mail: Frank.Lindseth at sintef.no
Telephone: +47 928 09 372
Telefax: +47 930 70 800





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