Tissue, depending on how dense it is, will attenuate or stop the beams. CT scan is like an x-ray, but it's like a moving x-ray. An MRI generates a magnetic field and we measure how the hydrogen atoms in our body spin to generate an image.
Hey, kiddo, it's what's INSIDE that matters -- like your guts and bones and squishy brain and intestines and stuff. Meet Dr. Varshana Gurusamy: diagnostic radiology resident, Texan and amazing person with great stories. You'll learn the difference between an MRI and an ultrasound, between a CT scan and a CAT scan and why you should not put big things in orifices that you might not be able to retrieve them unaided. You'll want to hug a radiologist ... as soon as they take their lead gonad shield off.
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Sound editing by Steven Ray Morris
Music by Nick Thorburn