State one advantage of MRI over X-ray medical imaging with reference to the electromagnetic spectrum.

Outline how MRI is used to scan the human body.

uses no ionizing radiation / uses low-energy radio waves / radio waves safer than x-rays / OWTTE;

Accept “does not damage body tissue”.

MRI is (usually) a proton NMR/\(^{\text{1}}{\text{H}}\,{\text{NMR}}\);

(the states of) protons/hydrogen atoms in water/lipids/carbohydrates/proteins/different (chemical) environments are detected;

different organs have different water concentration;

(strong) magnetic field and radio waves/frequency are used;

(by focusing the scanner on different parts of the body) three-dimensional/3-D

images of (organs in) the body are produced / OWTTE;

Most realized that radio waves are lower in energy than X-rays and so less harmful and in (b) quite a number of possible answers were accepted.

Most realized that radio waves are lower in energy than X-rays and so less harmful and in (b) quite a number of possible answers were accepted.