Article Figures & Data
Figures
- FIGURE 1.
Example of standard quantitative measurements specified for ACR PET phantom evaluation. Transaxial slice of 10-mm thickness is generated that includes hot and cold vials. Circular ROIs of 25-mm diameter are drawn, centered over each vial. Circular ROI (diameter between 60 and 70 mm) is drawn over background region. Some pass/fail criteria are based on SUV measurements of these regions, whereas other pass/fail criteria depend on qualitative assessment of hot vial visibility, cold rod visibility, and background uniformity. SUVbw = SUV normalized to body weight. Color version of this figure is available as supplemental file at http://tech.snmjournals.org.
- FIGURE 2.
Histograms of SUV and normalized SUV measurements of 16-mm hot vial for 17 phantom studies. From left to right: SUVmax using ACR ROI, SUVvial using cylindric VOI, normalized SUVmax using ACR ROI, and normalized SUVvial using cylindric VOI. Most consistent results are obtained with normalized SUVvial measurements.
- FIGURE 3.
Histograms of SUVmax ratio (left) and SUVvial ratio (right) for 16- to 25-mm hot vials. SUVvial ratios were more consistent and, unlike SUVmax ratios, did not have outliers greater than 1.0.
- FIGURE 4.
Cold rod contrast versus rod diameter (mean values for 17 phantom studies analyzed). SD for each point is approximately 0.01; error bars are smaller than size of markers.
Tables
- TABLE 1
Hot Vial SUVmax and SUVvial Measured With and Without Normalization Using ACR ROIs and Cylindric VOIs
Hot vial diameter (mm) SUVmax SUVvial SUVmax, Normalized SUVvial, Normalized 25 2.56 ± 6.7% 2.37 ± 6.2% 2.54 ± 3.6% 2.46 ± 3.1% 16 2.43 ± 9.7% 2.16 ± 7.2% 2.41 ± 7.0% 2.24 ± 3.8% 12 2.02 ± 6.0% 1.82 ± 5.6% 2.01 ± 5.2% 1.89 ± 2.4% 8 1.35 ± 9.4% 1.29 ± 8.3% 1.34 ± 6.3% 1.34 ± 3.7% SUVmax using 25-mm circular ROI in 10-mm slice. SUVvial using cylindric VOI. Normalized SUVs account for actual syringe activities and dilution vessel used during phantom preparation.
Hot vial ratio SUVmax ratio SUVvial ratio 16 mm/25 mm 0.95 ± 5.0% 0.91 ± 2.7% 12 mm/25 mm 0.79 ± 6.7% 0.77 ± 3.3% 8 mm/25 mm 0.53 ± 5.2% 0.54 ± 3.7% SUVmax using 25-mm circular ROI in 10-mm slice. SUVvial using cylindric VOI.
Parameter Rod diameter (mm) 12.7 11.1 9.5 7.9 6.4 4.8 Mean contrast 0.598 0.508 0.389 0.234 0.080 −0.011 SD 0.011 0.007 0.008 0.012 0.005 0.007 Data are for 17 studies.
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