Min/Max Tool

The Min/Max Tool allows the user to adjust the windowing of visible voxels for the first three Inputs.

Getting There

The Min/Max Tool is available via the Tools menu.

The Min/Max Tool can also be accessed by clicking on the Min/Max Tool thumbnail in the Main Window.

Function

The Min/Max Tool displays the windowing values with units for the Reference, Input 1 and Input 2. Whether the windowing is displayed based on Minimum/Maximum or Level/Width is determined by the Display Configuration.

The windowing values are used to calculate the colors for each voxel in the Display, by way of a mapping from voxel values to the colors in the color palette. Any values below the minimum will return the "lowest" color (e.g. black in the gray palette) while any values above the maximum will return the "highest" color (e.g. white in the gray palette).

The Min/Max tool makes use of a 'cache' feature, whereby minimum and maximum values for inputs are stored in a cache and used by the color mapping until the user forces the tool to recalculate them. The advantage to this is it enables users working with multiple datasets to, if they wish, keep the color scale consistent across multiple datasets.

Option Description
Re-calc Recalculates the min/max values for all data sets from the original data. Min/max value will be min/max voxel values in dataset.
Reset Resets the min/max values to the values stored in the cache.
Apply Stores min/max values in cache and applies values to the datasets.
From Pal Copies the current palette window as set in the Data Manager to the Min/Max Tool fields.
To Pal Copies the current Min/Max Tool fields to the palette window settings in the Data Manager.

The buttons with the icon will clip the data based on values in the tool. This can be useful when trying to clip dense bone from a CT scan, for instance, or background noise from a PT scan.

Option Description
(Min) Sets all values below the minimum to 0.
(Max) Sets all values above the maximum to 0.
Sets all values below the minimum to the minimum.
Sets all values above the maximum to the maximum.

Histogram

The Histogram button opens the Histogram Tool. This tool generates a histogram of voxel values in the loaded datasets. For more on this, visit the Histogram Tool page.

Percentile Tool

The Percentile button brings up the Percentile Tool, which calculates the pixel value associated with the Xth percentile from the histogram of the image.

Calculate the percentile value for selected image in the drop down list to the right
Copy to Max Copy computed pecentile value to the Max value above
Show percentile value with Patient Name, Paitent ID, Acquisition Time, Percentile, Cutoff Value, and Units information from image metadata
Load calculated percentile value into table
Highlight the row to delete from table with left-click and click the red X button