Nunzio wrote:NHE wrote:Hi 1eye,1eye wrote:So n*r*r of that cylindrical section is really volume of a cylindrical vein of length n and radius r. Clear as mud?
This wouldn't give you volume. For that you need length x area or n*π*r². In addition, cross sectional area is used for the comparison instead of something like the radius or diameter since the veins are often not perfect circles.
Hope this helps, NHE
I think the 1eye misunderstanding come from the fact that n represent the greek letter Pi or 3.14 which look like an eglish alphabet "n" or TT, therefore r*r*Pi is the area of a circle.
thank you for clarifying that for everyone. I was as confused by oneeye as others were. I was going to instruct that the formula made no sense as we are concerned with area, not volume, but you did it for me.
Some of the ultrasound units automatically calculate the area from the measurements. Often it is quite clear that the area of the vein is larger or smaller comparing upright and supine by simply eyeballing it, a pun both of you can relate to