Page 117 - Quantitative Imaging of Small Tumours with Positron Emission Tomography

Chapter 5 Repeatability of Patient-Level Metrics The highest repeatability was observed for TTV (RC 17%). TTBSUV had better repeatability than TTBTBR, albeit non-significantly (RC 23.2% versus 33.4%, p=0.19). Bland-Altman plots demonstrated no skewed variability (Figure 5.3). A 40 30 20 10 0 -10 -20 -30 -40 B 40 30 20 10 0 -10 -20 -30 -40 C 40 30 20 10 0 -10 -20 -30 -40 10 +1.96xSD -1.96xSD 1,000 +1.96xSD -1.96xSD 10,000 +1.96xSD -1.96xSD 10,000 1 10 100 Average (TTV) 1 10 100 Average (TTBSUV) 1,000 100 1,000 Average (TTBTBR) Figure 5.3: Bland-Altman plots of patient-level metrics TTV, TTBSUV, and TTBTBR. Y-axes were log-scaled for visual interpretation. 116 % test-retest difference % test-retest difference % test-retest difference