Difference between revisions of "Complex Image Set"

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(Created page with 'A complex image set cannot be represented by a single grid. Instead it is made up of multiple grids, because it includes things like: # gantry tilt # irregular slice spacing # ...')
 
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Proposed data structure shown in pseudocode
 
Proposed data structure shown in pseudocode
  
  ImageCollection {
+
  // The superclass is the reformatted image.  It is a standard itk image with uniform spacing & direction cosines.
  // The reformatted image is a standard itk image.  It has uniform spacing & direction cosines.
+
// The memory for the superclass image is not allocated until reformatting occurs.
  // It can be NULL if the collection has not yet been formatted.
+
itkImageCollection : itkOrientedImage {
  itkOrientedImage ReformattedImage;
+
  // The sourceImageGroup is an array of image sections.  Each image  
  // The group array is an array of image sections.  Each image  
+
  // section corresponds to a group of slices with the same tilt, spacing, etc.
  ImageGroupArray {
+
  itkArray<itkOrientedImage> sourceImageGroup;
    // ImageGroups are image sections with the same spacing, gantry tilt, etc.
 
    ImageGroup[0]
 
    ImageGroup[1]
 
    ...
 
 
  }
 
  }
  
Normal ITK routines will operate on the reformatted image (e.g. by making the ImageCollection a subclass of itkOrientedImage).  But if the user needs the original images or their headers, they are available.
+
Normal ITK routines will operate on the reformatted image, using C++ inheritance.  But if the user needs the original images or their headers, they are available.
 +
 
 +
At image load time, the image should be loaded as an image collection.  By default, reformatting will occur automatically using the spacing found in the largest source image.  If reformatting is not desired, the programmer must specify no reformatting prior to load.
 +
 
 +
After reformatting, the images within the source image group may be deallocated to save memory.  Deallocation can refer to the image data only (retaining header information for the image group items), or the entire group may be destroyed (leaving only the reformatted image).
 +
 
 +
By default, the image save will write the reformatted image to disk.  When saving as source image format, the reformatted image is first interpolated back to the source image space by the programmer.

Revision as of 15:07, 17 July 2009

Home < Complex Image Set

A complex image set cannot be represented by a single grid. Instead it is made up of multiple grids, because it includes things like:

  1. gantry tilt
  2. irregular slice spacing
  3. overlapping scans

Proposed data structure shown in pseudocode

// The superclass is the reformatted image.  It is a standard itk image with uniform spacing & direction cosines.
// The memory for the superclass image is not allocated until reformatting occurs.
itkImageCollection : itkOrientedImage {
  // The sourceImageGroup is an array of image sections.  Each image 
  // section corresponds to a group of slices with the same tilt, spacing, etc.
  itkArray<itkOrientedImage> sourceImageGroup;
}

Normal ITK routines will operate on the reformatted image, using C++ inheritance. But if the user needs the original images or their headers, they are available.

At image load time, the image should be loaded as an image collection. By default, reformatting will occur automatically using the spacing found in the largest source image. If reformatting is not desired, the programmer must specify no reformatting prior to load.

After reformatting, the images within the source image group may be deallocated to save memory. Deallocation can refer to the image data only (retaining header information for the image group items), or the entire group may be destroyed (leaving only the reformatted image).

By default, the image save will write the reformatted image to disk. When saving as source image format, the reformatted image is first interpolated back to the source image space by the programmer.