CASE 45 A 54-year-old man presents with acute shortness of breath and chest pain. Fig. 45.1 • A 3.0 mCi dose of 99mTc-MAA is administered intravenously with the patient supine. • The patient should cough and take several deep breaths before administration of the MAA to clear any areas of resting atelectasis. • The patient should breathe normally during tracer injection. • Use a low-energy, all-purpose collimator. • Energy window 20% centered at 140 keV. • Imaging time is 500,000 counts per view. • Matrix size is 128 × 128. • The views are anterior, right anterior oblique, left anterior oblique, posterior, right posterior oblique, and left posterior oblique. Lateral views can also be obtained, although it is important to remember that counts from the contralateral lung will contribute to these views. There is a small subsegmental defect involving the anterior basal segment of the right lower lobe abutting the expected location of the right major fissure, best seen on the right posterior oblique view (Fig. 45.1
Clinical Presentation
Technique
Image Interpretation
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