[vtkusers] vtkImageColorViewer and slice orientation

Mon Nov 30 17:41:43 EST 2009

thanks and till tomorrow !!!

On 11/30/09, David Gobbi <david.gobbi at gmail.com> wrote:
> It hardly makes any difference.  If you use one reslice, then it has
> to output several slices.  If you use multiple reslices, then each one
> only produces a single slice.  Overall, the amount of data in memory
> is the same.
>
>     David
>
>
> On Mon, Nov 30, 2009 at 3:30 PM, Lic. José M. Rodriguez Bacallao
> <jmrbcu at gmail.com> wrote:
>> 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
>> -----------------------------------------------------------------
>>
>

-- 
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
-----------------------------------------------------------------