Article Figures & Data
Figures
- FIGURE 1.
Planar V/Q scan with single mismatched perfusion defect (arrow) suggestive of intermediate probability of pulmonary embolism. LAO = left anterior oblique; LPO = left posterior oblique; RAP = right anterior oblique; RPO = right posterior oblique. (Reprinted from (5).)
- FIGURE 2.
For same patient study as outlined in Figure 1, planar V/Q scan after SPECT with representative slices demonstrating multiple defects (arrows), indicating more widespread pulmonary emboli. (Reprinted from (5).)
- FIGURE 3.
Slice-by-slice V/Q pairs for SPECT data with arrows highlighting mismatch defect typical of pulmonary embolism. (Reprinted from (26).)
- FIGURE 4.
Representative slices for ventilation (top), perfusion (middle), and parametric V:Q ratio images (bottom), with positive segments for pulmonary embolism denoted by darker shading on parametric images. (Reprinted with permission of (27).)
- FIGURE 5.
Representative SPECT/CT images of lung ventilation (top) and perfusion (bottom) demonstrating segmental perfusion defect (arrow in D and F) in left lower lobe with no CT opacity or matched ventilation defect consistent with pulmonary embolism. (Reprinted from (3).)
- FIGURE 6.
Fusion of SPECT and low-dose CT showing opacity (arrows) on CT corresponding to perfusion defect producing matching defect consistent with lung metastases. (Reprinted from (5).)
- FIGURE 7.
Fused perfusion SPECT and CTPA showing pulmonary emboli (arrows) bilaterally in arteries with associated perfusion defects on SPECT. (Reprinted with permission of (4).)
Tables
Imaging type United States (%) (n = 222) Australia (%) (n = 154) Planar only 66.7 3.2 Planar and SPECT 2.7 1.9 SPECT only with planar generated from SPECT 11.3 27.3 Planar and SPECT/CT 12.6 3.9 SPECT/CT only with planar generated from SPECT 5.4 61.1 SPECT/CT only 1.4 2.6 Parameter Planar V/Q SPECT V/Q SPECT/CT CTPA Q/CT Source Sensitivity 85% 100% — — — 20 76% 97% — — — 8 — 97% 97% 68% 93% 21 — 97% — 86% — 22 — — — 83% — 23 87% 91% 100% — 100% 13 High Very high High Moderate Very high 5,24 Specificity 100% 95% — — — 20 78% 96% — — — 25 85% 91% — — — 8 — 88% 100% 100% 51% 21 — 91% — 98% — 22 — — — 96% — 23 40% 56% 98% — 52% 13 Moderate High Very high Very high Low 5,24 Other findings Uncommon Uncommon Often Often Often 5,24 Radiation dose Low Low High Very high High 5,24 Technical issues Rare Rare Uncommon Often Uncommon 5,24 Availability During hours* During hours* During hours* During and after hours — 5,24 Adverse effects No No No Yes No 5,24 ↵* Availability after hours is possible in some nuclear medicine departments.
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