# Calculating Two-Dimensionsal Areas and Lengths

### MultiTracer version 2

On any given slice, the areas and lengths of structures can be calculated

Areas and Lengths can be calculated by doing the following:

- Choose "Analyze 2D Contours on This Plane" from the "Analyze" menu in the main window
- In the displayed table, the volumes of each valid structure are shown:
- Area
- This is the area of the structure on this plane.
- Open Length
- This is the length of the contour on this plane without including the distance from the final point
back to the initial point.
- Closed Length
- This is the length of the contour on this plane including the distance from the final point back to
the initial point.
- X Min
- This is the lowest x-coordinate found for the structure on this plane as measured in calibrated real
world units with the origin located at the center of the first voxel in the original image
- Y Min
- This is the lowest y-coordinate found for the structure on this plane as measured in calibrated real
world units with the origin located at the center of the first voxel in the original image
- Z Min
- This is the lowest z-coordinate found for the structure on this plane as measured in calibrated real
world units with the origin located at the center of the first voxel in the original image
- X Max
- This is the highest x-coordinate found for the structure on this plane as measured in calibrated real
world units with the origin located at the center of the first voxel in the original image
- Y Max
- This is the highest y-coordinate found for the structure on this plane as measured in calibrated real
world units with the origin located at the center of the first voxel in the original image
- Z Max
- This is the highest z-coordinate found for the structure on this plane as measured in calibrated real
world units with the origin located at the center of the first voxel in the original image

- Structures that have not been traced on this plane will be listed with zeros for all values.
- You can choose "Copy" from the "Edit" menu of the table's window to copy all of the data
in tab delimited format that can be pasted into a spreadsheet

©2001-2012 Roger P. Woods, M.D.
Modified: August 26, 2012