MRI, also known as Magnetic Resonance Imaging (source). It gives you a clear picture of what is actually happening inside your body, in a 2D view.
Here's a video of Japanese nurses are being scanned in the MRI machine.
I laughed until I cried my tears out! LMAO!! MUAHAHAHAHAHAHAHAHAHAHAAH!
Please press Ctrl + A or, right click, then "Select All".