Eigentool Segmentation
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Segmentation Dialog

Use this dialog to apply various filters to a set of images.

Note

Most of the settings for the Segmentation Dialog can be set through a resource file that is loaded at the start of the program.

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Example applying segmentation to a set of images.

  1. Load all  sequences from a single location from a patient study that are in alignment.  If the images are not aligned, run Registration.

  2. Select Automatic in the Region of Interest/Volume of Interest Dialog.

    1. Select an image that best displays the anatomical feature.

    2. Press the left button over the area corresponding to a single anatomical feature.

  3. Enter the name of the anatomical feature for the process name in the Filter Dialog, where r1 is the default name.

  4. Press Select Process in the Filter Dialog.

    Note

    Repeat Steps 2a, 2b, 3, and 4 for up to as many anatomical features as images that are loaded.

  5. Press Fltr Img in the Filter Dialog.

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Dialog Items

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Select Process

Define process # n to be used as one of the vectors when calculating a filter.  If a new process is being defined, the number of processes is increased by 1.  To start over, press Clear Processes.

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Process Type

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Select Roi to use a region of interest drawn on the current image of the selected browser or from a region of interest file selected in the File Load dialog.  The pixels in the region of interest will be used to calculate an average vector to be used as process # n.  If using a region of interest that was drawn, it will automatically be saved using the process name as the extension.  If the the region of interest is from a file, the extension will be displayed in the process name.

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Select 1, 2, 3, or 4 in B for the browser that contains the region of interest if using a region of interest that was drawn.

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Enter or display a name, of the anatomical feature, in Process Name.  Press Enter to Select Process, without using the Select Process button.

Note

The default is rn, where n is the process number.  The name will be highlighted for overwriting.

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Select Pixel to use each pixel vector as process # n when calculating a filter.

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Select Constant to use a constant vector as process # n when calculating a filter.

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Process Number

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Select or display n for the P to define/redefine process # n.  The process name will also be displayed, if it exits.

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Subtract Background

Enter a multiplication factor in -background.  The background vector will be mutliplied by this factor and then subtracted from process # n.

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Select Background

Press Select Background to use the a region of interest drawn on the current image of the selected browser or from a region of interest file selected in the File Load dialog as the background process.  The pixels in the region of interest will be used to calculate an average vector to be used as the background process.

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Clear Processes

Press Clear Processes to remove all process definitions.

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Filter Image

Press Filter Image to calculate the selected filter, using the processes that are currently defined.  If one of the processes is the pixel vector, a filter will be calculated for each pixel, otherwise a single filter is calculated.  The calculated filter(s) are then applied to the selected images.

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Filter Type

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Select Gram-Schmidt to use a gram-schmidt filter.

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Select Eigen to use eigen analysis to calculate the filter. (reference)

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Select Gram-Schmidt-Rotation to use a gram-schmidt filter with rotation.

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Select Gram-Schmidt-Constant to use a gram-schmidt filter with a constant.

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Select Matched w/o Variance to use a matched filter without variance.

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Select Matched w Variance to use a matched filter with variance.

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Select Correlation to use a correlation filter.

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Select Average to use an averaging filter (1 / # images).

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Select Energy Difference to use an energy difference filter.

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Select Difference of Energy to use a difference of energy filter.

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Select Cross Product to use a cross-product filter.

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Select Difference to use a difference filter. (reference)

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Select D-U1,U2 to use a gram-schmidt filter with first process being redefined as process #1 - process #2.  Process # 3 now becomes the second process.

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Select D-U2,U1to use a gram-schmidt filter with first process being redefined as process #1 - process #3.  Process # 2 remains the second process.

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Select Max-Min CNR to use a maximum-minimum contrast to noise ratio filter. (reference)

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Select Feature Suppression to use a feature suppression filter.

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Select (R inverse) * d to use a filter equal to the inverse of the covariance matrix of the second process multiplied by the first process.

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Select File to use a previously saved filter.  Either a signature (.sig) or report (.rep) file can be selected.

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Normalize

Select Normalize to normalize the filter vector.

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Smooth

Select Smooth to apply a butterworth smooth to the filter vector.

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Enter a value of the Butterworth filter in Order.

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Enter the cutoff frequency for the Butterworth filter in Cutoff.

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Output

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Select Single Process to create a filtered image with the first process as the desired process.

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Selected All Processes to create multiple filtered images, using each process as a desired process.

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Select A-Ortho to create a filtered image for each process as the desired process, with the remaining processes as undesired.  An image of the amplitude of the orthogonal vectors is also created.

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Select A-Corr to create a filtered image for each process as the desired process, with the remaining processes as undesired.  An image of the correlation of the orthogonal vectors is also created.

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Select A-Vec to create a filtered image for each process as the desired process, with the remaining processes as undesired.  The images, representing the orthogonal vectors, will also be created.

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Multiple Step

Select Multiple Step to display the process selection for a 2-step filtering process.

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Press More to display more processes.

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Press Less to display fewer processes.

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Select Process #n

Press Select Process to define process # n, using a region of interest.  The region of interest

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Enter or display a name, of the anatomical feature, in Process Name.

 

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Step 1

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Images

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Enable #n

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Desired

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Step 2

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Images

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Enable #n

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Desired

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Sig Stats

Note

This has not yet been implemented in this version.

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Angle Des

Note

This has not yet been implemented in this version.

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Discriminant

Note

This has not yet been implemented in this version.

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Ortho Vecs

Note

This has not yet been implemented in this version.

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Restore

Note

This has not yet been implemented in this version.

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Rest Mult

Note

This has not yet been implemented in this version.

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PCA

Note

This has not yet been implemented in this version.

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Whole Image

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Roi (All Images)

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Rois (One Image)

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Recon

Note

This has not yet been implemented in this version.

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# Images

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Correlat

Note

This has not yet been implemented in this version.

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Angle

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Correlation

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Target Pt.

Note

This has not yet been implemented in this version.

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Loc Var

Note

This has not yet been implemented in this version.

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e

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x by

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Regen

Press Regen to regenerate the original sequence with the selected process.

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Select Desired to regenerate the first process only.

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Select Subtracted to regenerate all processes, except the first.

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Repeat

Press Repeat to perform segmentation on other browsers or files.

Note

Previous results of repeat processing need to be deleted manually for images saved in Dicom format.

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Cancel

Press Cancel to remove the Segmentation dialog.

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Help

Press Help to display help for the Segmentation dialog.

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Last modified: 01/17/05