Support:Documents:Manual:COMKAT Image Tools
COMKAT Image Tool topics
Volume of interest (VOI) operations of COMKAT
COMKAT Image Tools support the volume of interest operations. It is simple to draw a VOI and find it's statistics. We also provide functions for user to extend the capabilities.
Definition of a volume of interest
A volume of interest is defined as 'a collection of regions of interest (ROI or ROIs)'. It contains at least one ROI.
A region of interest (ROI) is defined as 'a list of vertices's that creates an image mask to find the pixels within this mask'.
ROIs in a VOI do not necessarily have to be on the same plane or be of the same size.
VOI and ROI
VOI with multiple ROIs is usually used to find statistics or time-activity curve over a volume. If you want to look at individual regions, create several VOIs with one ROI per VOI.
COMKAT VOI object
A VOI is defined and stored as a 'VOI' object. You may go to '@VOI' folder under COMKAT root to find its constructor and properties.
Properties of a VOI
Here are some important properties of a VOI:
- Name - VOI name.
- NumberOfROIs - how many ROIs are in this VOI
- TAC - the time activity curve of this VOI. If there are two image volume data, it will be a 2 element cell array.