Table 3:

Qualitative assessment of image quality, based on average ratings of 2 readers (N = 64 subjects)

	MBIR		ASiR		Difference (MBIR-ASiR)
	Mean	(95% CI)	Mean	(95% CI)	Mean	(95% CI)	P Valuea
Nasopharynx	4.80 ± 0.26	(4.74–4.87)	4.16 ± 0.31	(4.08–4.23)	0.65 ± 0.30	(0.57–0.72)	<.001
Oropharynx	3.74 ± 0.60	(3.59–3.89)	3.08 ± 0.64	(2.92–3.24)	0.66 ± 0.37	(0.56–0.75)	<.001
Vocal cord	3.73 ± 0.53	(3.59–3.86)	4.02 ± 0.37	(3.92–4.11)	−0.29 ± 0.53	(−0.42 to −0.16)	<.001
SC junction	3.41 ± 0.48	(3.29–3.53)	3.75 ± 0.25	(3.69–3.82)	−0.34 ± 0.52	(−0.47 to −0.21)	<.001
Overall IQ	3.85 ± 0.32	(3.77–3.93)	3.69 ± 0.28	(3.62–3.76)	0.17 ± 0.31	(0.09–0.24)	<.001

Note:—SC indicates sternoclavicular; IQ, image quality.

^aWilcoxon signed ranked test.