[vtkusers] vtkImageColorViewer and slice orientation

Mon Nov 30 17:30:31 EST 2009

last question for today, how memory hungry is that setup (one anything
per slice)?

On 11/30/09, David Gobbi <david.gobbi at gmail.com> wrote:
> On Mon, Nov 30, 2009 at 2:49 PM, Lic. José M. Rodriguez Bacallao
> <jmrbcu at gmail.com> wrote:
>> reader.GetOutput().Update() is not the same that reader.Update()?
>
> When VTK 5.0 was released, data.Update() did a little bit extra that
> algorithm.Update() did not do, i.e. in VTK 5.0 the pipeline was newly
> designed and had some bugs.  Now the pipeline bugs are fixed, but I
> still always call update on data out of habit.
>
>
>> if U have a renderer per slice, why to have a reslice for every render
>> and not just one?
>
> Because I find that the easiest way to use vtkImageReslice is to make
> it output just one slice.  It is just my preference, in other words.
>
>
>> How do I achieve that if I change the window/level in a renderer, all
>> images in the 4x4 configuration get updated with the same
>> window/level?
>
> Easy.  Use the same vtkLookupTable for all images.  In your data
> pipeline, use vtkImageMapToColors() to color the data.  I cannot help
> you with vtkImageColorViewer because I never use that class.
>
>     David
>
>
>> On 11/30/09, David Gobbi <david.gobbi at gmail.com> wrote:
>>> Usually I use a separate renderer for each slice.  This also means a
>>> separate reslice, image actor, etc.
>>>
>>> For this to work efficiently, you must force the reader to read all
>>> the whole dicom series, like this:
>>>
>>> reader.GetOutput().Update()
>>>
>>> If you don't do this, then the reader will only read one slice at a
>>> time, so if you are displaying 4x4 then it will go to the disk 16
>>> times on every render.  By calling update on the the reader, you force
>>> the whole series into memory.
>>>
>>>     David
>>>
>>>
>>> On Mon, Nov 30, 2009 at 1:58 PM, Lic. José M. Rodriguez Bacallao
>>> <jmrbcu at gmail.com> wrote:
>>>> thanks, and another question:
>>>>
>>>> I need to display the images in a dicom serie in several
>>>> configurations: just one image, 2 images side by side, 2x2 images and
>>>> so on. Which is the recommended way to display those configurations in
>>>> a render window, with several renderers or with several image actors?
>>>>
>>>> On 11/30/09, David Gobbi <david.gobbi at gmail.com> wrote:
>>>>> On Mon, Nov 30, 2009 at 1:11 PM, Lic. José M. Rodriguez Bacallao
>>>>> <jmrbcu at gmail.com> wrote:
>>>>>> yes, thanks, in fact this is my pattern example but, in this example
>>>>>> the sagital view is flipped, why is that?
>>>>>
>>>>> You are complaining because the head is facing right instead of facing
>>>>> left??  It is still sagittal.
>>>>>
>>>>>> PS: So, to use ImageReslice for an dicom image viewer is not a
>>>>>> problem?
>>>>>
>>>>> No problem at all.  Plenty of people use it for dicom.  The only
>>>>> restrictions are the following:
>>>>>
>>>>> 1) the spacing must be constant
>>>>>
>>>>> 2) the gantry must not be tilted
>>>>>
>>>>> These restrictions are true for all vtkImageData.  Fortunately, CT and
>>>>> MRI almost always use constant slice spacing, so that is never a
>>>>> problem.  CT gantry tilt can be fairly common, though, so any dicom
>>>>> image viewer should check for it.  MR images never have gantry tilt.
>>>>>
>>>>>     David
>>>>>
>>>>>
>>>>>>
>>>>>> On 11/30/09, David Gobbi <david.gobbi at gmail.com> wrote:
>>>>>>> I didn't give the full path for the example in my last email.  Here
>>>>>>> it
>>>>>>> is:
>>>>>>>
>>>>>>> VTK/Examples/ImageProcessing/Python/ImageSlicing.py
>>>>>>>
>>>>>>>    David
>>>>>>>
>>>>>>>
>>>>>>> On Mon, Nov 30, 2009 at 12:25 PM, David Gobbi <david.gobbi at gmail.com>
>>>>>>> wrote:
>>>>>>>> Because no-one has contributed a reslicng image viewer to VTK yet.
>>>>>>>>  I
>>>>>>>> would like to do so myself, but I don't know when I will have the
>>>>>>>> time.
>>>>>>>>
>>>>>>>> I did submit a python reslicing example to VTK that you might find
>>>>>>>> useful:
>>>>>>>>
>>>>>>>> VTK/Examples/Python/ImageSlicing.py
>>>>>>>>
>>>>>>>>   David
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mon, Nov 30, 2009 at 11:45 AM, Lic. José M. Rodriguez Bacallao
>>>>>>>> <jmrbcu at gmail.com> wrote:
>>>>>>>>> why is that?
>>>>>>>>>
>>>>>>>>> On 11/30/09, David Gobbi <david.gobbi at gmail.com> wrote:
>>>>>>>>>> The only class that uses vtkImageReslice for image viewing is
>>>>>>>>>> vtkImagePlaneWidget, you can try it to see if it is suitable for
>>>>>>>>>> your
>>>>>>>>>> application.  That is the closest thing to a generic reslicing
>>>>>>>>>> image
>>>>>>>>>> viewer that VTK has.
>>>>>>>>>>
>>>>>>>>>>    David
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Mon, Nov 30, 2009 at 9:20 AM, Lic. José M. Rodriguez Bacallao
>>>>>>>>>> <jmrbcu at gmail.com> wrote:
>>>>>>>>>>> why vtkImageColorViewer(I think that vtkImageViewer2 too) doesn't
>>>>>>>>>>> use
>>>>>>>>>>> vtkImageReslice for changing the slice orientation (axial,
>>>>>>>>>>> sagital
>>>>>>>>>>> and
>>>>>>>>>>> coronal)? I am just curious!!!
>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>> Lic. José M. Rodriguez Bacallao
>>>>>>>>>>> Centro de Biofisica Medica
>>>>>>>>>>> -----------------------------------------------------------------
>>>>>>>>>>> Todos somos muy ignorantes, lo que ocurre es que no todos
>>>>>>>>>>> ignoramos
>>>>>>>>>>> lo
>>>>>>>>>>> mismo.
>>>>>>>>>>>
>>>>>>>>>>> Recuerda: El arca de Noe fue construida por aficionados, el
>>>>>>>>>>> titanic
>>>>>>>>>>> por profesionales
>>>>>>>>>>> -----------------------------------------------------------------
>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Lic. José M. Rodriguez Bacallao
>>>>>>>>> Centro de Biofisica Medica
>>>>>>>>> -----------------------------------------------------------------
>>>>>>>>> Todos somos muy ignorantes, lo que ocurre es que no todos ignoramos
>>>>>>>>> lo
>>>>>>>>> mismo.
>>>>>>>>>
>>>>>>>>> Recuerda: El arca de Noe fue construida por aficionados, el titanic
>>>>>>>>> por profesionales
>>>>>>>>> -----------------------------------------------------------------
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Lic. José M. Rodriguez Bacallao
>>>>>> Centro de Biofisica Medica
>>>>>> -----------------------------------------------------------------
>>>>>> Todos somos muy ignorantes, lo que ocurre es que no todos ignoramos lo
>>>>>> mismo.
>>>>>>
>>>>>> Recuerda: El arca de Noe fue construida por aficionados, el titanic
>>>>>> por profesionales
>>>>>> -----------------------------------------------------------------
>>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Lic. José M. Rodriguez Bacallao
>>>> Centro de Biofisica Medica
>>>> -----------------------------------------------------------------
>>>> Todos somos muy ignorantes, lo que ocurre es que no todos ignoramos lo
>>>> mismo.
>>>>
>>>> Recuerda: El arca de Noe fue construida por aficionados, el titanic
>>>> por profesionales
>>>> -----------------------------------------------------------------
>>>>
>>>
>>
>>
>> --
>> Lic. José M. Rodriguez Bacallao
>> Centro de Biofisica Medica
>> -----------------------------------------------------------------
>> Todos somos muy ignorantes, lo que ocurre es que no todos ignoramos lo
>> mismo.
>>
>> Recuerda: El arca de Noe fue construida por aficionados, el titanic
>> por profesionales
>> -----------------------------------------------------------------
>>
>

-- 
Lic. José M. Rodriguez Bacallao
Centro de Biofisica Medica
-----------------------------------------------------------------
Todos somos muy ignorantes, lo que ocurre es que no todos ignoramos lo mismo.

Recuerda: El arca de Noe fue construida por aficionados, el titanic
por profesionales
-----------------------------------------------------------------