I'm not sure how to use this for measurements.

Me neither. Actual banana MRI:

First pic is a banana mandala.  Second pic is a banana rapture.

Geege that is very clever. That's clever clever land!

Source has other fruit! http://www.geekosystem.com/fruit-mri-pineapple-orange-banana/

Oh, and here's broccoli, watermelon, and cantaloupe MRI scans:

http://pandawhale.com/post/26311/broccoli-mri-gif-also-watermelon-and-cantaloupe