Automated 3D quantitative assessment and measurement of alpha angles from the femoral head-neck junction using MR imaging

Xia, Ying, Fripp, Jurgen, Chandra, Shekhar S., Walker, Duncan, Crozier, Stuart and Engstrom, Craig M. (2015) Automated 3D quantitative assessment and measurement of alpha angles from the femoral head-neck junction using MR imaging. Physics in Medicine and Biology, 60 19: 7601-7616. doi:10.1088/0031-9155/60/19/7601

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Author Xia, Ying
Fripp, Jurgen
Chandra, Shekhar S.
Walker, Duncan
Crozier, Stuart
Engstrom, Craig M.
Title Automated 3D quantitative assessment and measurement of alpha angles from the femoral head-neck junction using MR imaging
Journal name Physics in Medicine and Biology   Check publisher's open access policy
ISSN 0031-9155
1361-6560
Publication date 2015-09-21
Year available 2015
Sub-type Article (original research)
DOI 10.1088/0031-9155/60/19/7601
Open Access Status Not Open Access
Volume 60
Issue 19
Start page 7601
End page 7616
Total pages 16
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Collection year 2016
Language eng
Formatted abstract
To develop an automated approach for 3D quantitative assessment and measurement of alpha angles from the femoral head-neck (FHN) junction using bone models derived from magnetic resonance (MR) images of the hip joint.

Bilateral MR images of the hip joints were acquired from 30 male volunteers (healthy active individuals and high-performance athletes, aged 18–49 years) using a water-excited 3D dual echo steady state (DESS) sequence. In a subset of these subjects (18 water-polo players), additional True Fast Imaging with Steady-state Precession (TrueFISP) images were acquired from the right hip joint. For both MR image sets, an active shape model based algorithm was used to generate automated 3D bone reconstructions of the proximal femur. Subsequently, a local coordinate system of the femur was constructed to compute a 2D shape map to project femoral head sphericity for calculation of alpha angles around the FHN junction. To evaluate automated alpha angle measures, manual analyses were performed on anterosuperior and anterior radial MR slices from the FHN junction that were automatically reformatted using the constructed coordinate system.

High intra- and inter-rater reliability (intra-class correlation coefficients  >  0.95) was found for manual alpha angle measurements from the auto-extracted anterosuperior and anterior radial slices. Strong correlations were observed between manual and automatic measures of alpha angles for anterosuperior (r  =  0.84) and anterior (r  =  0.92) FHN positions. For matched DESS and TrueFISP images, there were no significant differences between automated alpha angle measures obtained from the upper anterior quadrant of the FHN junction (two-way repeated measures ANOVA, F  <  0.01, p  =  0.98).

Our automatic 3D method analysed MR images of the hip joints to generate alpha angle measures around the FHN junction circumference with very good reliability and reproducibility. This work has the potential to improve analyses of cam-type lesions of the FHN junction for large-scale morphometric and clinical MR investigations of the human hip region.
Keyword alpha angle
femoroacetabular impingement
magnetic resonance imaging
cam lesion
hip joint
quantitative assessment
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Wed, 23 Sep 2015, 21:16:52 EST by Craig Engstrom on behalf of School of Human Movement and Nutrition Sciences