A number of techniques are used for diagnostic imaging of internal body organs. Which of these involve ionizing radiation and therefore pose a risk for 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

CT scans and nuclear heart scans both involve ionizing radiation, which has been linked to an increased risk of cancer. MRI scans, ultrasound, and EKGs do not use ionizing radiation and are considered safer alternatives.

A Number of Techniques Are Used for Diagnostic Imaging of Internal