[vtkusers] vtkImageColorViewer and slice orientation

Mon Nov 30 16:49:24 EST 2009

reader.GetOutput().Update() is not the same that reader.Update()?

if U have a renderer per slice, why to have a reslice for every render
and not just one?
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?

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