[vtkusers] vtkDistanceWidget and Dicom Images

[John Drescher]

On Tue, Oct 19, 2010 at 1:28 PM, John Drescher <drescherjm at gmail.com> wrote:
> On Tue, Oct 19, 2010 at 1:18 PM, Leonardo M. Ramé <l.rame at griensu.com> wrote:
>> On 2010-10-19 13:09:51 -0400, John Drescher wrote:
>>> On Tue, Oct 19, 2010 at 9:46 AM, Leonardo M. Ramé <l.rame at griensu.com> wrote:
>>> > Hi, I use this code to add a vtkDistanceWidget to a scene showing a
>>> > Dicom image:
>>> >
>>> > distanceWidget = vtkDistanceWidget::New();
>>> > distanceWidget->SetInteractor(this->GetInteractor());
>>> > static_cast<vtkDistanceRepresentation*>(distanceWidget->GetRepresentation())->SetLabelFormat("%-#6.2f mm");
>>> > distanceWidget->On();
>>> >
>>> > The problem here is the measures I'm getting from the distance widget
>>> > are not related to the real image. For example, when I measure one image
>>> > with another Dicom viewer, it shows that I has 360mm width, and the
>>> > vtkDistanceWidget says it has 1748,30mm.
>>> >
>>> > How can I define the relation between the size of the real image and the
>>> > representation I'm showing on screen?
>>> >
>>>
>>> Is the spacing correct in the vtkImageData?
>>>
>>> John
>>
>> Thanks, if I apply a spacing of 0.20, got it from dicom tag (0028,0030),
>> it measures exactly as the other Dicom Viewer.
>>
>> ...but, now my image is rendered too small, I have to zoom it with the
>> mouse. Is there a way to render it to fill the QVTKWidget regardless of
>> its size?
>>
>
> I would use vtkChangeInformation filter right after the reader to
> change the spacing.
>

I meant vtkImageChangeInformation

John