Part 2 · Dyes, Tracers and Treating with Rays
Same concept, other depth: Clinical Reasoning →
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A pregnant woman at 30 weeks is breathless and her heart is racing. Doctors suspect a blood clot in her lungs. Her chest X‑ray is normal. A perfusion scan using a small dose shows normal blood flow everywhere, which rules out a large clot and spares her a CT scan.
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