A Number of Techniques Are Used for Diagnostic Imaging of Internal

Multiple Choice

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)

A) I and IV
B) I, II, and IV
C) IV only
D) I, IV, and V
E) II, IV, and V