A number of techniques are used for diagnostic imaging of internal body organs. Which of these do not involve ionizing radiation and therefore do not pose a risk for producing cancer?
I. CT scan (X-ray computed tomography)
II. MRI scan (radio-wave magnetic resonance imaging)
III. US scan (ultrasound)
IV. Nuclear heart scan (radioactive tracer)
V.EKG (electrocardiograph)

Question

Quizplus · Accepted Answer

MRI scans use radio waves and magnetic fields, ultrasound uses sound waves, and EKGs measure electrical activity of the heart. None of these involve ionizing radiation, unlike CT scans and nuclear heart scans which do use ionizing radiation.

A Number of Techniques Are Used for Diagnostic Imaging of Internal