TY - JOUR
T1 - Pelvic floor levator hiatus measurements
T2 - MRI versus ultrasound
AU - Nardos, Rahel
AU - Thurmond, Amy
AU - Holland, Amanda
AU - Gregory, W. Thomas
PY - 2014
Y1 - 2014
N2 - Objective: The objective of this study is to compare levator hiatus measurements between pelvic magnetic resonance imaging (MRI) and pelvic ultrasound (US) imaging modalities. Methods: We performed pelvic MRI and 3-dimensional US in 37 asymptomatic nulliparous women. For the MRI protocols, we performed axial and sagittal sequences at rest.We then obtained sagittal sequences during Kegel squeeze and Valsalva maneuvers. Blinded to the findings of the MRI, we obtained 3-dimensional pelvic US images using a perineal approach at rest, Kegel and Valsalva maneuvers. Finally, we measured the levator hiatus in both sagittal and axial planes. Results: For the resting sagittal measurements, the mean levator hiatus measurement using MRI (5.0 cm; SD, 0.8) is significantly greater than that using US (4.4 cm; SD, 0.6; P ≤ 0.05). Although the absolute mean levator measurements between the 2 modalities are significantly different, this difference is not influenced by the magnitude of the measurements as noted in Bland-Altman plots of the limits of agreement. Conclusions: We found that the MRI measurements obtained from the sagittal images were consistently greater than the corresponding US images. In contrast, there was not the same consistency of difference between MRI and US for the axial images. This suggests possible variation in acquisition planes for axial images or interpretation of landmarks for the sagittal images.
AB - Objective: The objective of this study is to compare levator hiatus measurements between pelvic magnetic resonance imaging (MRI) and pelvic ultrasound (US) imaging modalities. Methods: We performed pelvic MRI and 3-dimensional US in 37 asymptomatic nulliparous women. For the MRI protocols, we performed axial and sagittal sequences at rest.We then obtained sagittal sequences during Kegel squeeze and Valsalva maneuvers. Blinded to the findings of the MRI, we obtained 3-dimensional pelvic US images using a perineal approach at rest, Kegel and Valsalva maneuvers. Finally, we measured the levator hiatus in both sagittal and axial planes. Results: For the resting sagittal measurements, the mean levator hiatus measurement using MRI (5.0 cm; SD, 0.8) is significantly greater than that using US (4.4 cm; SD, 0.6; P ≤ 0.05). Although the absolute mean levator measurements between the 2 modalities are significantly different, this difference is not influenced by the magnitude of the measurements as noted in Bland-Altman plots of the limits of agreement. Conclusions: We found that the MRI measurements obtained from the sagittal images were consistently greater than the corresponding US images. In contrast, there was not the same consistency of difference between MRI and US for the axial images. This suggests possible variation in acquisition planes for axial images or interpretation of landmarks for the sagittal images.
KW - Pelvic MRI
KW - Pelvic US
KW - Pelvic floor imaging
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U2 - 10.1097/SPV.0000000000000079
DO - 10.1097/SPV.0000000000000079
M3 - Article
C2 - 24978088
AN - SCOPUS:84905823417
SN - 2151-8378
VL - 20
SP - 216
EP - 221
JO - Female Pelvic Medicine and Reconstructive Surgery
JF - Female Pelvic Medicine and Reconstructive Surgery
IS - 4
ER -