[vtkusers] vtkImageReslice and SetSlabNumberOfSlices(int)

[Marco Sambin]

David,

Thanks for the clarification.
Regards,

Marco
Il 03/lug/2015 08:09 PM, "David Gobbi" <david.gobbi at gmail.com> ha scritto:

> Yes, the slab is centered wrt the reslice plane.  So if SlabNumberOfSlices
> is even, then the two middle "slab" slices will be on either side of the
> reslice plane (+0.5 above and -0.5 below).
>
> Though this isn't quite related, note that it is possible to change the
> spacing between the "slab" slices with SetSlabSliceSpacingFraction().
>
>  - David
>
> On Fri, Jul 3, 2015 at 3:51 AM, Marco Sambin <m.sambin at gmail.com> wrote:
>
>> Hi all,
>>
>> with reference to this old question of mine (see below), I would like a
>> clarification:
>>
>> suppose that the output z-spacing is set to 1 mm on my vtkImageReslice
>> instance. Also, suppose that I call SetSlabNumberOfSlices(2) on my reslicer.
>> Where will the 2 slices used to compute the slab image be located w.r.t.
>> the position of my reslice plane? Will the first slice be 0.5 mm "above"
>> and the second slice be 0.5 mm "below" my reslice plane? In other words,
>> will the slices always be "centered" w.r.t. the position of my reslice
>> plane?
>>
>> Maybe this is a silly question, but I like to exactly understand this
>> point.
>>
>> Thanks in advance for the clarification.
>> Regards,
>>
>> Marco
>>
>>
>> On Mon, Mar 25, 2013 at 9:59 PM, Marco Sambin <m.sambin at gmail.com> wrote:
>>
>>> Hi David,
>>>
>>> Thanks for the clarification.
>>> I will test this soon.
>>> Regards,
>>>
>>> Marco
>>>  Il giorno 25/mar/2013 14:24, "David Gobbi" <david.gobbi at gmail.com> ha
>>> scritto:
>>>
>>>> Hi Marco,
>>>>
>>>> The way it works is this: vtkImageReslice is creating the slab by
>>>> extracting N samples and combining them, where the distance between
>>>> the samples is set by the third argument to SetOutputSpacing().  If
>>>> the SlabNumberOfSlices is N, then the slab thickness is
>>>> (N-1)*spacing[2] where spacing[2] is the z-spacing set with
>>>> SetOutputSpacing(spacing[0],spacing[1],spacing[2]).
>>>>
>>>> Summary: thickness = (N - 1)*spacing[2]
>>>>
>>>> Slab mode is equivalent to extracting N slices and combining them.
>>>>
>>>>  - David
>>>>
>>>> On Mon, Mar 25, 2013 at 6:01 AM, Marco Sambin <m.sambin at gmail.com>
>>>> wrote:
>>>> > Hi all.
>>>> > I am looking at implementing thick reformats through vtkImageReslice.
>>>> >
>>>> > Even after looking at the documentation, I did not fully understand
>>>> the
>>>> > SetSlabNumberOfSlices(int) method. For instance, in cases of an
>>>> oblique
>>>> > reformat, what is considered to be a "slice"? What defines the
>>>> "thickness"
>>>> > of a single slice, thus determining the total slab thickness
>>>> resulting from
>>>> > calling SetSlabNumberOfSlices(X)?
>>>> >
>>>> > I was expecting a call like SetSlabThickness(...), rather than
>>>> > SetSlabNumberOfSlices(...).
>>>> >
>>>> > I would appreciate any comment on this.
>>>> > Thanks in advance.
>>>> >
>>>> > Marco
>>>
>>>
>
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