You are a radiologist and you have tour patients in your waiting room. You can o
ID: 944229 • Letter: Y
Question
You are a radiologist and you have tour patients in your waiting room. You can only use each of the of following modalities once: ultrasound. MRI, CT. and PET. Patient A has a suspected broken bone in his right leg. Patient B is a pregnant woman whose infant is at risk of a cardiac problem. Patient C presents neurological deficiencies consistent with a brain tumor. Patient D has symptoms consistent with a tear in anterior cruciate ligament in his knee. Which modality do you use on which patient, and why?Explanation / Answer
pregnant women: ultrasound
ultrasound produces sound waves that are beamed into the body causing return echoes that are recorded to "visualize" structures beneath the skin. The ability to measure different echoes reflected from a variety of tissues allows a shadow picture to be constructed.
patient A:
patient D: MRI scan
MRI (Magnetic Resonance Imaging) scanning is a medical investigation that uses an exceptionally strong magnet and radio frequency waves to generate image of your body.
patient C: PET:
Unlike other imaging tests, such as CT or MRI, PET scans show problems at the cellular level.
patient A: CT scan
A computerised tomography (CT) scan uses X-rays and a computer to create detailed images of the inside of the body.
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