[Insight-users] Coordinate?? Read a DICOM Series into an oriented Image volume

[Bill Lorensen]

ITK uses LPS and creates a right handed volume from a series of images.

On Mon, Mar 23, 2009 at 1:34 PM, Gen-Nan Chen <gnchen at gmail.com> wrote:
> Hi! All,
>
> I use ITK's example to read a CT DICOM series into an oriented Image volume.
> It works but I got confused about the coordinate system it used.
>
> From DICOM's tags. I got
> ImageOrientationPatient =100, 010
> ImagePositionPatient (from InstanceNumber=1) = -191.9000, -197.6000, 7.5000
> ImagePositionPatient (from InstanceNumber=2) = -191.9000, -197.6000, 6.9000
>
>
> After reading into a 3 D Image volume,
> I got
>
>  Origin: [-191.9, -197.6, -332.1]
>  Direction: [1 0 0]
>                 [0 1 0]
>                 [0 0 1]
>
> I thought ITK will convert RAS instead of LPH in DICOM. Can somebody verify
> that ? Looks like the coordinate is still in LPH but only reversing in the Z
> direction? (original is 0 0 -1)
>
>
> --
> Gen-Nan Chen, Ph. D.
> email: gnchen at gmail.com
>
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