Segmentation of the proximal femur in radial MR scans using a random forest classifier and deformable model registration.

Damopoulos, Dimitrios; Lerch, Till; Schmaranzer, Florian; Tannast, Moritz; Chênes, Christophe; Zheng, Guoyan; Schmid, Jérôme (2019). Segmentation of the proximal femur in radial MR scans using a random forest classifier and deformable model registration. International Journal of Computer Assisted Radiology and Surgery, 14(3), pp. 545-561. Springer-Verlag 10.1007/s11548-018-1899-z

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BACKGROUND Radial 2D MRI scans of the hip are routinely used for the diagnosis of the cam type of femoroacetabular impingement (FAI) and of avascular necrosis (AVN) of the femoral head, both considered causes of hip joint osteoarthritis in young and active patients. A method for automated and accurate segmentation of the proximal femur from radial MRI scans could be very useful in both clinical routine and biomechanical studies. However, to our knowledge, no such method has been published before. PURPOSE The aims of this study are the development of a system for the segmentation of the proximal femur from radial MRI scans and the reconstruction of its 3D model that can be used for diagnosis and planning of hip-preserving surgery. METHODS The proposed system relies on: (a) a random forest classifier and (b) the registration of a 3D template mesh of the femur to the radial slices based on a physically based deformable model. The input to the system are the radial slices and the manually specified positions of three landmarks. Our dataset consists of the radial MRI scans of 25 patients symptomatic of FAI or AVN and accompanying manual segmentation of the femur, treated as the ground truth. RESULTS The achieved segmentation of the proximal femur has an average Dice similarity coefficient (DSC) of 96.37 ± 1.55%, an average symmetric mean absolute distance (SMAD) of 0.94 ± 0.39 mm and an average Hausdorff distance of 2.37 ± 1.14 mm. In the femoral head subregion, the average SMAD is 0.64 ± 0.18 mm and the average Hausdorff distance is 1.41 ± 0.56 mm. CONCLUSIONS We validated a semiautomated method for the segmentation of the proximal femur from radial MR scans. A 3D model of the proximal femur is also reconstructed, which can be used for the planning of hip-preserving surgery.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB [discontinued]
04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

UniBE Contributor:

Damopoulos, Dimitrios; Lerch, Till; Schmaranzer, Florian; Tannast, Moritz and Zheng, Guoyan

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

1861-6410

Publisher:

Springer-Verlag

Language:

English

Submitter:

Kathrin Aeschlimann

Date Deposited:

31 Oct 2019 09:55

Last Modified:

01 Nov 2019 08:26

Publisher DOI:

10.1007/s11548-018-1899-z

PubMed ID:

30604143

Uncontrolled Keywords:

3D reconstruction Deformable model Proximal femur Radial imaging of the hip Random forest Segmentation

BORIS DOI:

10.7892/boris.134139

URI:

https://boris.unibe.ch/id/eprint/134139

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