Table 3.
The National Electrical Manufactures Association Image quality test result, i.e., contrast recovery, background variability, and percentage relative lung error for the images reconstructed by VPHD and Q. Clear reconstruction technique
| Image quality | Hot sphere |
Cold sphere |
||||
|---|---|---|---|---|---|---|
| 10 mm | 13 mm | 17 mm | 22 mm | 28 mm | 37 mm | |
| The percentage contrast for each hot sphere | ||||||
| Prescribed limits | (>30) | (>40) | (>50) | (>60) | (>60) | (>60) |
| VPHD | 33.7 | 43.1 | 59.9 | 67.7 | 71.5 | 74.2 |
| Q. Clear | 41.9 | 59.4 | 69.7 | 85 | 82.1 | 88.9 |
| The percentage background variability | ||||||
| Prescribed limits | (<12) | (<10) | (<9) | (<7) | (<6) | (<5) |
| VPHD | 5.7 | 4.7 | 3.7 | 2.8 | 2.2 | 1.8 |
| Q. Clear | 4.8 | 4.1 | 3.2 | 2.4 | 1.8 | 1.3 |
| Accuracy of attenuation and scatter corrections | ||||||
| Prescribed limits | (<5.5) | |||||
| VPHD | 3.74 | |||||
| Q. Clear | ||||||
| Percentage relative error for each slice in lung slice | ||||||
| Prescribed limits | (19) | |||||
| VPHD | 16.8 | |||||
| Q. Clear | 10.1 | |||||
| Radioactivity concentration in KBq/mL | 5.3 KBq/mL | |||||