tomography

Concise Oxford English Dictionary © 2008 Oxford University Press:
tomography /təˈmɒgrəfi/

▶noun a technique for displaying a cross section through a human body or other solid object using X-rays or ultrasound.

– derivatives
tomogram noun,
tomographic adjective.

– origin 1930s: from Gk tomos ‘slice, section’ + -graphy.