Image Parameters

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ImageParametersDialog.PNG

This dialog specifies image resolution and orientation that is used to reorient and interpolate the image. For DICOM images this should automatically be read from the header, for other image types it must be specified manually.

Input

  • Input Original Resolution - Specify the resolution of the original image. This is used to interpolate the images to isotropic voxels so they display properly. The values are treated as ratios so inputting 0.25x0.25x1.0 is the same as 1x1x4.
  • Interpolate Image - Speficies whether to interpolate the images to isotropic voxels when it is reformatted.
  • Hanning Sinc Filter - The intpolation used is a Fourier zero filling algorithm. A Hanning filter raised to a power is applied to reduce Gibb'g ringing, this specifies the the power the filter is raised to. A low value reduces the filter, while values close to 1 make the filter stronger.
  • Input Original Orientation - Specify the original orientation of the image, this is used to reorient the image into the requested orientation.
  • Flip X, Y, Z - Specify whether the x, y, or z dimension should be mirrored. Sometimes this is necessary to get one of the dimensions to display correctly.
  • Orientation Matrix (Advanced) - The orientation matrix defines a direction cosine rotation matrix relative to a standard axial orientation. This matrix is only designed to handle values of ±1 in an orientation that is reducible to the identity matrix (values that correspond only to 90 and 180 degree rotations).


Reorient Images

The orientation of the current image must be known to reorient the image into standard orientations (axial, sagittal, and coronal). If the current orientation is not specified correctly the reoriented images will not show up correctly (will be upside down, have right left transposed, etc). The reorientation is available on the top toolbar.

Interpolate Images

Image reformatting can be used to interpolate the image. By inputting the interpolation factors desired in the "original resolution" input and then clicking on desired orientation the image will be interpolated by the requested amount. This is helpful for properly displaying anisotropic voxels.

Mirror Images

Image reformatting can be used to mirror the image. Selecting "Flip X", "Flip Y", or "Flip Z" will mirror the selected dimension when you click on the desired orientation on the top tool bar. To mirror an axial image about the y direction open image parameters, select "Flip Y", select OK, then click on the axial orientation button on the top toolbar. This will display the image in the same orientation but with the y direction mirrored.