Article Figures & Data
Figures
- FIGURE 1.
Sensitivity values at 0- and 10-cm offset. (A) Sensitivity as function of numbers of attenuating aluminum sleeves. (B) Axial sensitivity profile.
- FIGURE 2.
Count rates for prompt, random, true, and scatter events and noise-equivalent count (NEC) as function of activity concentration.
- FIGURE 3.
Scatter fraction for Omni Legend as function of activity concentration.
- FIGURE 4.
Accuracy of extrapolated true rate (A) and maximum, mean, and minimum error (B) as function of activity concentration for Omni Legend.
- FIGURE 5.
Images of deluxe (A) and mini deluxe (B) Derenzo phantoms using Q.Clear (β-value, 50): original distribution of CT images (left) and actual acquired PET images (right).
- FIGURE 6.
Pancreatic cancer patient images acquired using Omni Legend at 120 s/bed position (8 min total). (A) Maximum-intensity-projection PET images. Numbers indicate lesion SUVmax. (B) Transaxial PET images. HPDL = high-precision DL; LPDL = low precision DL; MPDL = medium-precision DL; noise = noise level of liver (%); non-PDL = nonprecision DL; PSF = point-spread function.
- FIGURE 7.
Lung cancer patient images acquired using Omni Legend at 120 s/bed position (8 min total). (A) Maximum-intensity-projection PET images. Numbers indicate lesion SUVmax. (B) Coronal PET images. HPDL = high-precision DL; LPDL = low precision DL; MPDL = medium-precision DL; noise = noise level of liver (%); non-PDL = nonprecision DL; PSF = point-spread function.
Tables
Parameter Value Spatial resolution (FWHM, mm) FBP 1 cm 4.34, radial; 4.22, tangential; 4.42, axial 10 cm 5.90, radial; 4.55, tangential; 5.57, axial 20 cm 7.83, radial; 5.03, tangential; 5.59, axial OSEM 1 cm 3.89, radial; 3.73, tangential; 3.61, axial 10 cm 5.10, radial; 3.90, tangential; 3.76, axial 20 cm 7.59, radial; 4.26, tangential; 3.58, axial Sensitivity (cps/kBq) At center 47.30 At 10 cm 47.05 Count rate statistics Peak NECR (kcps) 501.7 Peak NECR activity (kBq/mL) 15.70 Scatter fraction at peak NECR (%) 35.42 Maximum error at peak NECR (%) 1.70 Maximum mean error at peak NECR (%) 0.98 Image quality (%) OSEM 10 mm 53.5 (3.1), CR; 8.0 (0.8), BV 13 mm 65.1 (2.2), CR; 6.5 (0.9), BV 17 mm 73.0 (2.8), CR; 5.0 (0.6), BV 22 mm 78.5 (2.4), CR; 3.9 (0.3), BV 28 mm 85.3 (2.7), CR; 3.2 (0.3), BV 37 mm 88.9 (2.3), CR; 2.6 (0.1), BV Average lung error 12.0 (0.3) Q.Clear (β-value, 50) 10 mm 61.3 (3.3), CR; 5.4(0.8), BV 13 mm 75.2 (1.6), CR; 4.2(0.4), BV 17 mm 80.1 (1.3), CR; 3.3(0.3), BV 22 mm 84.5 (1.2), CR; 2.7(0.3), BV 28 mm 90.1 (1.2), CR; 2.2(0.3), BV 37 mm 93.0 (1.2), CR; 1.7(0.1), BV Average lung error 5.1 (0.3) Q.Clear (β-value, 300) 10 mm 36.4 (2.1), CR; 2.9(0.5), BV 13 mm 60.5 (0.5), CR; 2.5(0.4), BV 17 mm 71.6 (0.6), CR; 2.1(0.3), BV 22 mm 79.3 (0.8), CR; 1.8(0.3), BV 28 mm 85.1 (0.6), CR; 1.5(0.2), BV 37 mm 89.7 (0.3), CR; 1.3(0.1), BV Average lung error 6.3 (0.2) Coregistration accuracy (mm) Error at (0,1) 0.85, 5 cm; 2.47, 100 cm Error at (0,20) 1.54, 5 cm; 3.30, 100 cm Error at (20,0) 1.29, 5 cm; 2.73, 100 cm FWHM = full width at half maximum; FBP = filtered backprojection; CR = contrast recovery; BV = background variability.
Data in parentheses are SDs.
Supplemental Data
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