[vtkusers] vtkImageColorViewer and slice orientation

[David Gobbi]

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
> -----------------------------------------------------------------
>