Table 1.

Evaluation for statistical significant differences (N = 18 vascular territories) regarding image quality (using an ordinal 5-point Likert scale with 1 being “excellent image quality”) and diagnostic confidence (using an ordinal 5-point Likert scale with 1 being “very high confidence of detecting the bleeding site”) for both readers were analysed with the non-parametric Friedman test (Median values with interquartile range in brackets as well as Bonferroni corrected p-values are stated and significant values are marked with an asterisk)

	Reader 1			Reader 2
CTA	Selective regional angiogram	CBCT	CTA	Selective regional angiogram	CBCT
Image quality	1.0 (1.0–2.0)	2.0 (1.8–4.0)	2.0 (1.8–2.0)	1.0 (1.0–2.0)	2.0 (2.0–3.3)	2.0 (2.0–3.0)
p = 0.1699			p = 0.5001
Diagnostic confidence	3.0 (3.0–4.3)	4.0 (2.8–5.0)	1.5 (1.0–3.3)	3.0 (2.0–3.0)	5.0 (3.5–5.0)	2.0 (1.8–3.0)
p = 0.0024*			p = 0.0005*

CBCT, cone beam CT; CTA, CT angiography.