[vtkusers] vtkImageReslice and SetSlabNumberOfSlices(int)

[Marco Sambin]

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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