[vtkusers] vtkImageReslice and SetSlabNumberOfSlices(int)

[David Gobbi]

Hi Marco,

It was added a few months after VTK 6.1 was released.

 - David

On Fri, Jul 10, 2015 at 2:49 AM, Marco Sambin <m.sambin at gmail.com> wrote:

> Hi.
> Regarding the SetSlabSliceSpacingFraction() method of vtkImageReslice, it
> is a recent addition?
> I cannot find it in my VTK 6.1...
>
> Thanks and best regards,
>
> Marco Sambin
>
>
> On Tue, Jul 7, 2015 at 9:19 AM, Marco Sambin <m.sambin at gmail.com> wrote:
>
>> 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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