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Orthogonal Views Dialog
Use this dialog to change the
orientation of
images (sagital, coronal, or axial).
Note
This dialog uses the
Automated Image Registration
package (alignlinear) from UCLA. You must download and install the
AIR software for this dialog to function. The programs must also be in your
search path for this method to work. To check, type "which zoomer" on a
command-line terminal. If you do not get the full path to the program, you
need to add the path to the programs in your .cshrc or .profile. See your
System Administrator for help.
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Example
Modify Slice Thickness of One Data Set to Match Another
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Determine the x
pixel size, y pixel size, and thickness of each set.
- Calculate the zoom factor:
If the
thickness of the set not being modified is more than 1 mm:
zoom factor = 100 * (smallest of x, y pixel size in millimeters of set to
modify) /
(fractional amount of slice thickness in millimeters of set
not to modify)
e.g., if slice thickness is 3.2, use 0.2
otherwise:
zoom factor = 100 * (smallest of x, y pixel size in millimeters of set to
modify) /
(slice thickness in millimeters of set not to modify)
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Analyze->Misc.->Math
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Enter the zoom
factor calculated in Step 2 in the 1st Value Field.
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Select
Overwrite.
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Press Zoo,
select the Browser # of the set to modify when the
Image Selection Dialog
appears.
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Analyze->Pre-Processing->Orthogonal
Views
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If the thickness of the set not
being modified is more than 1 mm, enter the (slice thickness of set not
to modify / fractional amount from Step 2) in # Avg.
e.g. if slice thickness is 3.2, enter 3.2/.2 = 16
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Press Cubic
Volume.
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Analyze->Misc.->Math
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Enter the
inverse of the zoom
factor calculated in Step 2 in the 1st Value Field.
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Select
Overwrite.
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Press Zoo,
select the Browser # of the set created in Step 4 when the
Image Selection Dialog
appears.
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Dialog Items
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Cubic Volume
Press Cubic
Volume to convert the data set to a cubic volume (all pixel sizes
equal). The smallest pixel size of the x, y, or z dimension will be
used.
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Switch Orientation
Press X <-> Z
to switch the X axis and the Z axis of the image data set. Press Y
<-> Z to switch the Y axis and the Z axis of the image data set.
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Number of Images
to Average
Enter a value
in # Avg for the number of images to average in the Z direction, once
the image set has been reoriented.
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Note
There functions first convert the data set to a cubic volume (all pixels
sizes equal).
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Computer Name
Enter the
name of the computer in Computer Name that the AIR package is
installed on.
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Reslice
Press Reslice
to reslice all images to a new thickness for the purpose of using the images
with another set of images with different voxel dimensions. This
automates the procedure for modifying thicknesses
above.
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Enter the
thickness for the resliced images in Thickness.
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Cancel
Press Cancel
to remove the Orthogonal Views dialog. |
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Help
Press Help
to display help for the Orthogonal Views dialog. |
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