schlunzi

Of note: if the scan is not done for diagnostic purposes, i.e. if no doctor looks at your images to do a diagnosis, then it is not considered medical data at all. Just like taking a photograph of yourself.

To expand on Deniz' answer, Klarismo (YC S15) does a full body MRI, including a high resolution scan of your head for $249, available in SF and LA at the moment. We extract your brain, segment out gray and white matter and measure your brain volume. In addition we segment, measure and visualize visceral fat, subcutaneous fat and major muscle groups.