Assessment of the Impact of Turbo Factor on Image Quality and Tissue Volumetrics in Brain Magnetic Resonance Imaging Using the Three-Dimensional T1-Weighted (3D T1W) Sequence

Table 5

Median, first quartile, third quartile, and interquartile values for SNR of white matter (WM) and CNR of white matter/gray matter (WM/GM) and gray matter/cerebrospinal fluid (GM/CSF).

Turbo factor	Scan time (mins)	SNR				CNR GM/WM				CNR GM/CSF				EN
		Median	Q1	Q3	IQR	Median	Q1	Q3	IQR	Median	Q1	Q3	IQR	Median	Q1	Q3	IQR
50	20 : 25	14.91	14.36	19.98	5.62	2.29	2.20	2.35	0.15	1.15	1.06	1.16	0.10	-7	-15	-6	9
100	10 : 13	15.83	14.79	17.51	2.72	2.28	2.14	2.28	0.14	1.11	1.06	1.15	0.08	-15	-25	-7	18
150	5 : 08	16.41	14.17	16.93	2.76	2.27	2.13	2.27	0.14	1.13	1.06	1.19	0.13	-18	-23	-14	9
200	5 : 08	17.01	14.34	19.33	4.99	2.29	2.13	2.31	0.18	1.15	0.97	1.16	0.19	-13	-19	-8	11
225	5 : 08	15.73	14.32	19.44	5.12	2.21	2.08	2.28	0.19	1.11	1.04	1.12	0.08	-21	-32	-16	16

Note: Q1 = first quartile; Q3 = third quartile; IQR = interquartile range.