[vtkusers] vtkImageSlabReslice and SlabResolution

[David Gobbi]

It is perfectly valid to express resolution as a distance,
in which case a smaller value means "higher resolution".
Which is higher resolution, a satellite photo with 5 meter
resolution or a satellite photo with 50 meter resolution?

On Thu, Apr 11, 2013 at 12:34 PM, Boxer, Aaron <Aaron.Boxer at uhn.ca> wrote:
> 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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