Region of Interest (ROI) Analysis
Introduction
Regions of interest (ROIs) are geometric shapes that can be used to compute statistics about features that you see in a medical image. Typical uses for ROI analysis include:
- Lesion area and volume computation for assessing disease status.
- Calculating ejection fraction in dynamic cardiac images.
- Selectively removing parts of the image, based on their intensity characteristics, for the purposes of editing images.
- Calculation of signal-to-noise ratio in quality assurance programmes.
Jim has eleven types of ROI:
- Text annotation
- Marker
- Line
- Curved line
- Rectangular
- Elliptical
- Irregular, manually drawn
- Irregular, from contour following
- Open Spline curved line
- Closed Spline
- Hollow, formed by merging two or more ROIs, where one ROI contains all the others.
Jim has sophisticated ROI editing facilities, that will be easy-to-use for anyone familiar with modern presentation packages.
Multiple ROIs can be "grouped", to make certain editing operations (such as changing the colour of several ROIs together) simpler and quicker.
Once defined, ROIs can be saved to disk, and later retrieved and shown either in the same image, or in different images. The statistics about the regions can similarly be saved to disk, in a format suitable for importing into any spreadsheet program.
ROIs saved to disk include audit trail information, for use in clinical trials, where it is important to know the history of ROI creation and modification.
Start the ROI Toolkit from the Toolkits menu: 