Phantom Radius & Ratio

General
1

I am trying to calculate the dimensions of the phantom so I can calculate scaling. I thought I understood what phantom_radius, width ratio, and height ratio were but apparently not. I thought i would be able to use the following equation to compute height or width:

W = 2 * radius * width ratio

This doesn’t seem to work correctly.

2

Well, I take that back. Maybe it does work. I was comparing the area from L x W to phantom area, but the latter is in pixels.