[IGSTK-Users] Viewer Problem due to TransformPhysicalPointToIndex

[Patrick Cheng]

Hi Fucang,

A new TransformPhysicalPointToContinuousIndex(p,index) function and a
ContinuousIndexType is being added to the ImageSpatialObject's API.

Now if you take the pick position and use the continuous index to
reslice the image, it will be much smoother and won't jump.

Please update your IGSTK main and Sandbox repository code.

Thank you,

Patrick

Fucang Jia wrote:
> Hi, Patrick,
>  
> There is a problem due to TransformPhysicalPointToIndex function, which 
> belongs to Bug# 738,
> but it seems that this critial bug has not been fixed.
>  
> When I load IGSTK\Sandbox-Release-8\Testing\Data\E000192,
> press the left mouse button on the sagittal view in 
> FourViewsTrackingWithCT app continuously,
> then the index changes little bye one, when the index of sagittal viewer 
> was changed to 0, I press the
> mouse button onto the sagittal image, it says "Picked point outside 
> image". I tracked this bug,
> and found that it is due to index round up problem.
>  
> For example, the origin is  -153.6640625,
> the spacing is 0.671875
> the physical coordinate is 16.3203
> so the according index is
> (16.3203+153.6640625)/0.671875 = 252.9999813953,
> it was truncated to 252.
>  
> Then resliceImage function will change the orthogonal image slice.
>  
> I also found this behaviour will occur when certain DICOM dataset is 
> loaded. When I load other DICOM dataset,
> the axial and coronal slice will have problem, but sagittal view does 
> not change when mouse pressed. It is because
> that certain origin and spacing parameters trigger this problem.
>  
> Thanks!
>  
> Fucang
> 
> 
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