Table 4.

Magnetic resonance imaging (MRI) and membranous urethral length (MUL) measurement procedures

	MRI equipment	Use of an endorectal coil	Professional measuring MUL	Plane used for MUL measurement	Were the assessor(s) blinded to patient continence data when measuring the MUL	MUL, mean ± SD (mm)	MUL range (mm)
Choi et al [14] 2015	3T	No	Urologist	Sagittal	Yes	11.9 ± 2.5	5–23
Kadono et al [15] 2015	NR	NR	NR	NR	NR	NR	NR
Matsushita et al [16] 2015	1.5 and 3T	Yes	Radiologist	Coronal	Yes	12.3 ± 3.7	10, 15a
Tienza et al [17] 2015	1.5T	NR	Radiologist	Sagittal	Yes	14.3 ± 4.5	6.7–34.3
Jeong et al [18] 2014	1.5T	NR	NR	NR	NR	12.8 ± 2.75	5–23
Lee et al [19] 2014	1.5T	NR	2 radiologists	Coronal	Yes	12.3 ± 2.5	5–21.5
Jeong et al [20] 2013	1.5T	NR	2 radiologists	Coronal	NR	12.8 ± 2.7	6–23
Lee et al [21] 2013	1.5T	Yes	Urologist	Coronal	Yes	11.9 ± 2.5	5.6–20.5
Kim et al [22] 2011	1.5T	No	Urologist	Sagittal	Yes	11.2 ± 3.1	5–23
Lim et al [23] 2012	NR	No	Radiologist	Sagittal cross-referenced with coronal	Yes	10.4 ± 3.8	NR
Paparel et al [24] 2009	1.5	Yes	Radiologist and urologist by consensus	Sagittal cross-referenced with coronal	Yes	13.3 ± 3	6–21
Lee et al [25] 2006	1.5T	No	2 radiologists	Coronal	Yes	NR	NR
Coakley et al [26] 2002	1.5T	Yes	2 radiologists	Coronal	Yes	14.5 ± 3.5	6–24

^aInterquartile range.

NR = not reported; SD = standard deviation; T = Tesla.