Quantitative image quality evaluation of pelvic computed tomography-based imaging systems: A novel concept in radiotherapy

Figures & data

Figure 1. VGC analysis for physician 1, physician 2, RTT1, and RTT2, respectively. pCT performs better than CBCT_iX with all points above the “equal line”. The equal line corresponds to no difference between the two modalities. In general, CBCT_Tb seems to be superior to CBCT_iX, however, one point is below the equal line (for physician 1) and 0.5 is within the CIs for the physicians (Table I).

Table I. The results of the VGC analysis. AUCs for pCT compared to CBCT_iX and CBCT_Tb compared to CBCT_iX as well as the 95% CIs.

	pCT vs. CBCTiX		CBCTTb vs. CBCTiX
	AUC	95% CI	AUC	95% CI
Physician 1	0.61	[0.48; 0.74]	0.53	[0.44; 0.61]
Physician 2	0.82	[0.73; 0.92]	0.56	[0.48; 0.65]
RTT 1	0.88	[0.78; 0.99]	0.67	[0.58; 0.76]
RTT2	0.95	[0.91; 0.99]	0.64	[0.55; 0.72]