[vtkusers] vtkImageSlabReslice and SlabResolution

[Boxer, Aaron]

By the way, I find the name SlabResolution a bit confusing,
because it is inversely proportional to sampling.
I usually associate higher resolution with higher sample same rate.

 

-----Original Message-----
From: David Gobbi [mailto:david.gobbi at gmail.com] 
Sent: Wednesday, April 10, 2013 6:00 PM
To: Boxer, Aaron
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] vtkImageSlabReslice and SlabResolution

Hi Aaron,

The SlabResolution must be less than the sample spacing of your original data set in order to avoid undersampling.  So it should suffice to use SlabResolution=min(spacing[0], spacing[1], spacing[2]) where "spacing" is the voxel spacing of your data.

 - David

On Wed, Apr 10, 2013 at 8:31 AM, Boxer, Aaron <Aaron.Boxer at uhn.ca> wrote:
> Hello,
>
>
>
> I am using vtkImageSlabReslice to perform thick multi planar 
> reformatting on a medical CT dataset,
>
> using MIP for the slabs.
>
>
>
> There are two parameters that I need to set: SlabThickness   and
> SlabResolution.
>
> I calculate SlabThickness in world coordinates based on the pixel 
> dimensions and pixel-to-mm scaling factors,
>
> but I am not sure what is the best value for SlabResolution.
>
>
>
> Currently I am using the default value of one for the resolution.
>
>
>
> According to the header file,
>
>
>
> # of slices in slab = (2 x (int)(0.5 x SlabThickness/SlabResolution)) 
> + 1;
>
>
>
> Any insight here would be greatly appreciated,
>
> Aaron

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