Article Figures & Data
Figures
- FIGURE 1.
Scheme of beating-heart phantom: LV of heart is simulated by double-elastic membrane forming inner cavity filled with distilled water and outer cavity filled with air. Interior compartment represents ventricular cavity, and inside of double membrane represents cardiac wall and is filled with radioactive solution. Pumping unit guarantees periodic expansion of interior compartment, allowing volume changes of this cavity simulating cardiac cycle.
- FIGURE 2.
Effect of order on difference from true value of LVEF and value measured (%) and cutoff frequency in FBP reconstruction.
- FIGURE 3.
Effect of number of subsets on difference from true value of LVEF and value measured (error) and number of iterations in OSEM reconstruction.
- FIGURE 4.
Effect of number of EM equivalent iterations on difference from true value of volumes and ejection fraction of LV and value measured (error) in OSEM reconstruction.
Tables
EDV ESV SV LVEF Cutoff frequency Range (mL) Mean ± SD ρ Range (mL) Mean ± SD ρ Range (mL) Mean ± SD ρ Range (%) Mean ± SD ρ 0.2 51–61 55.0 ± 4.24 −0.633 2–10 5.3 ± 3.40 −0.400 49–51 49.8 ± 0.96 −0.949* 84–97 91.0 ± 5.48 0.400 0.3 77–78 77.5 ± 0.58 0.447 19–21 20.0 ± 0.82 0.949* 57–58 57.5 ± 0.58 −0.894 73–76 74.3 ± 1.26 −0.949* 0.4 84–86 85.0 ± 0.82 0.316 23–25 24.3 ± 0.96 0.316 60–61 60.8 ± 0.50 −0.258 71–73 71.5 ± 1.00 −0.775 0.5 86–88 87.3 ± 0.96 0.949* 24–25 24.5 ± 0.58 0.000 62–64 62.8 ± 0.96 −0.949* 71–72 71.3 ± 0.50 −0.775 0.6 85–87 86.3 ± 0.96 −0.316 24–25 24.8 ± 0.50 −0.775 61–62 61.5 ± 0.58 −0.000 71 71.0 ± 0.00 — 0.7 85–86 85.8 ± 0.50 −0.258 24–25 24.8 ± 0.50 −0.258 61 61.0 ± 0.00 — 71 71.0 ± 0.00 — 0.8 86–87 86.5 ± 0.58 −0.447 25 25.0 ± 0.00 — 61–62 61.5 ± 0.58 0.447 71 71.0 ± 0.00 — ↵* Correlations are significant when P ≤ 0.05.
EDV ESV SV LVEF No. of subsets Range (mL) Mean ± SD ρ Range (mL) Mean ± SD ρ Range (mL) Mean ± SD ρ Range (%) Mean ± SD ρ 2 61–95 82.8 ± 11.22 1.00* 10–32 25.1 ± 7.47 0.99* 51–63 57.7 ± 3.87 0.99* 66–83 70.6 ± 5.85 −0.99* 4 70–96 88.9 ± 8.31 1.00* 16–33 28.8 ± 5.42 0.99* 54–63 60.1 ± 2.94 0.98* 65–77 67.9 ± 3.62 −0.95* 6 72–96 89.2 ± 7.68 0.97* 17–33 29.0 ± 5.03 0.95* 55–64 60.2 ± 2.82 0.92* 66–76 67.8 ± 3.27 −0.86* 8 83–95 92.7 ± 3.90 0.69 26–33 31.4 ± 2.30 0.69* 57–63 61.2 ± 1.79 0.48 65–69 66.0 ± 1.32 −0.63 10 83–95 92.6 ± 3.70 0.72 26–33 31.6 ± 2.18 0.51 57–62 61.0 ± 1.58 0.84* 65–69 66.0 ± 1.23 −0.37 12 83–96 92.8 ± 4.06 0.82* 26–33 31.6 ± 2.30 0.75* 57–63 61.2 ± 1.79 0.86* 65–69 66.2 ± 1.20 −0.91* 16 92–96 94.2 ± 1.20 0.52 31–33 32.1 ± 0.60 0.52 61–63 62.1 ± 0.61 0.52 65–67 65.9 ± 0.60 −0.52 ↵* Correlations are significant when P ≤ 0.05.
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