Region of Interest Histograms & Line Profiles

Region of Interest Histograms

You can display, save (to disk) or export to a PDF document a histogram of ROI intensities for any single ROI. To start this feature, select Show Histogram from the View menu in the ROI Toolkit:

The histogram dialog will now pop up, showing a blank histogram until an ROI is selected.

As the mouse is moved over the histogram graph, the intensity and number of pixels at the mouse location are shown at the bottom of the Intensity Histogram dialog.

For Line, For CurvedLine and For Open Spline ROIs, the histogram shows the intensity and length of the line that has this intensity.

To write the histogram data to disk, select Write from the File menu in the Intensity Histogram dialog:

The histogram data is written in tab-separated table with two columns: the first is the pixel intensity, and the second is the number of pixels with this intensity. See the File Formats section.

Click the button to finish with the histograms.

To export this graph to a PDF document, select Export as PDF from the File menu.

Region of Interest Line Profiles

You can display, save (to disk) and export to a PDF document a profile of intensities along a Line, Curved Line or Open Spline ROI. To view a line profile, select Show Line Profile from the View menu of the ROI Toolkit:

The Line Intensity Profile dialog will now pop up, showing a blank profile until the a Line ROI is selected.

Note: a profile of intensities is shown only when you have selected either a Line, Curved Line or a Open Spline ROI.

As the mouse is moved over the line profile graph, the distance from one end of the line and the pixel intensity at that position is shown at the bottom left of the Line Profile dialog.

To save the data for this graph to disk, select Write from the File menu.

To export this graph to a PDF document, select Export as PDF from the File menu.