[IGSTK-Users] On Orthogonal Viewer Orientation Setup

[Fucang Jia]

Hi, Patrick, James,

Thanks for the quick reply!

I am just using both CT and axial MRI scan datasets to test. Though the dataset is CT, the view orientation is the same as I described. I tried to revise the view up vector, but if I changed the camera view up for several times, but no luck. I will have a try to get camera parameters when I view the dataset in orthogonal 3D view. And then setup the viewup normal.

If Oblique slice view could easy setup the view direction, that is great!

Fucang

 

>Hi Fucang,
>
>The orientation and display of medical image is very tricky, Currently
>in IGSTK we don't reorient the image volume.
>
>in igstkView2D we different three orthogonal views by manipulating the
>camera position. sample code:
>
>/** Select the orientation of the View */
>void View2D::RequestSetOrientation( const OrientationType & orientation )
>{
>
>  m_Orientation = orientation;
>
>  double focalPoint[3];
>  double position[3];
>
>  for ( unsigned int cc = 0; cc < 3; cc++)
>    {
>    focalPoint[cc] = 0.0;
>    position[cc]   = focalPoint[cc];
>    }
>
>  const double distanceToFocalPoint = 1000;
>
>  switch( m_Orientation )
>    {
>  case Sagittal:
>      {
>      position[0] += distanceToFocalPoint;
>      m_Camera->SetViewUp (     0,  0,  -1 );
>      break;
>      }
>  case Coronal:
>      {
>      position[1] += distanceToFocalPoint;
>      m_Camera->SetViewUp (     0,  0,  -1 );
>      break;
>      }
>  case Axial:
>      {
>      position[2] += distanceToFocalPoint;
>      m_Camera->SetViewUp (     0,  -1,  0 );
>      break;
>      }
>    }
>
>  m_Camera->SetPosition (   position );
>  m_Camera->SetFocalPoint ( focalPoint );
>  m_Camera->SetClippingRange( 0.1, 100000 );
>  m_Camera->ParallelProjectionOn();
>}
>
>This is based on an assumption that the axes of image is as follows
>(in DICOM 3.0 standard):
>X-axis: Right    (hand)  ->  Left      (hand)
>Y-axis: Anterior (front) ->  Posterior (back)
>Z-axis: Inferior (feet)  ->  Superior  (head)
>
>This is common is most CT images, however MR images could come in many
>different orientations. DICOM uses a direction cosine to specify the
>acquisition orientation. for details:
>http://xmedcon.sourceforge.net/docs/orient/medcon1.html
>
>There is a itkOrientImageFilter can be used to flip or permute the
>axes of an image volume. Given original orientation information (three
>letter code or dicom direction cosine) and target orientation
>information (three letter code)
>http://www.itk.org/Doxygen/html/classitk_1_1OrientImageFilter.html
>
>You can try to reorient the image to standard orientation first and
>then see if the image is being displayed correctly.
>
>We will discuss the viewing issue among our developers hoping find a
>better solution.
>
>Patrick
>
>Fucang Jia wrote:
>> Hello,
>>  
>> I am now trying IGSTK which is a powerful toolkit. And try the
>> FourViewsTrackingWithCT example. When a CT series is loaded,
>> the viewer can display three orthogonal plane. The axial, sagittal and
>> coronal direction is as follows:
>> axial:      x: Left  -> Right             y: Anterior -> Posterior
>> sagittal:  x: Posterior -> Anterior  y: Inferior -> Superior
>> coronal: x: Left  -> Right              y: Inferior -> Superior
>> the y axis direction is from the top to the bottom of the monitor. I am
>> running the application on Win XP.
>>  
>> I do not know how to setup  the view as classical view , such as
>> VolView and SNAP which display the nose to the left, and patient
>> right is screen left.
>>  
>> axial:      x: Right -> Left                y: Anterior -> Posterior
>> sagittal:  x: Anterior -> Posterior    y: Superior -> Inferior
>> coronal: x: Right -> Left                y: Superior -> Inferior
>>  
>> If there are some convinent to achieve this effect?
>>  
>> Thanks!
>>  
>> Fucang
>> ==================================
>> Fucang Jia, PhD
>> Department of Biomedical Engineering,
>> Zhejiang University,
>> Hangzhou, 310027,
>> P.R.China
>>  
>>  
>>  
>>  
>>  
>>  
>> 
>> 
>> ------------------------------------------------------------------------
>> 
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>
>-- 
>Patrick Cheng                              Work phone: 202-687-2902
>Software Engineer                          Work fax:   202-784-3479
>Email: cheng at isis.georgetown.edu
>
>Imaging Science and Information Systems (ISIS) Center
>Department of Radiology, Georgetown University Medical Center
>2115 Wisconsin Avenue, Suite 603, Washington, DC, 20007
>