introduction to neuroradiology

Question 1

limitations of a CT scan

Answer 1

• Dose of radiation (1 CT head = 100 chest x-rays)
• Limited anatomical detail – axial plane but now volume data
• Requires iodinated contrast media – potential for allergic reaction

Question 2

strengths of a CT scan

Answer 2

• Better that MRI for demonstrating bone & calcification

* Quicker scan times than MRI

Question 3

limitations of an MRI scan

Answer 3

• Contrast injection may be required
• Strong magnetic field – in some patients MRI is contraindicated
• Noisy & claustrophobic
• Longer scan times than CT

Question 4

Strengths of an MRI scan

Answer 4

• No ionising radiation
• Multiple planes possible
• Excellent anatomical detail