PMC4899939_01
59-year-old female with suspected pulmonary embolism. The V/Q scan on day one. Ventilation and perfusion images are mirror copies of each other due to significant dose infiltration during perfusion. V-ventilation, P-perfusion.
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On the first day, the ventilation images and perfusion images looked similar, and there was some soft-tissue and renal activity in the perfusion images (Fig. 1).
59-year-old female with suspected pulmonary embolism. Repeated perfusion images of the patient in case 1 on the following day (bottom two rows).
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MBq (5.2 mCi) of Tc99m MAA (Fig. 2), and a higher count rate was achieved (7.6 Kcounts/second). Matched defects were reported in bilateral lower lung zones (more pronounced on ventilation), without any definite evidence of segmental mismatched perfusion defects, consistent with a "low" probability for PE, according to the PIOPED criteria.
PMC4899939_02
51-year-old female with suspected pulmonary embolism. The V/Q scan of patient in case 2 on day one, again showing absence of tracer signal in perfusion images due to dose infiltration.
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The images (Fig. 3) showed heterogeneous activity in both lungs.
51-year-old female with suspected pulmonary embolism. Repeated perfusion scan of the patient in case 2 on the following day (bottom two rows).
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Tc99m MAA dose infiltration, which was confirmed by noting the count rate on the ventilation study (4.5 Kcounts/second) and the count rate on perfusion study (9.8 Kcounts/second), with the ratio of counts being only 2.1. The perfusion study was repeated the next day (Fig. 4), after the IV administration of 196.1 MBq (5.3 mCi) of Tc99m MAA, and the count rate was higher (12.5 Kcounts/second).