Authors:
László Ruskó
1
;
Marta E. Capala
2
;
Vanda Czipczer
1
;
Bernadett Kolozsvári
1
;
Borbála Deák-Karancsi
1
;
Renáta Czabány
3
;
Bence Gyalai
3
;
Tao Tan
1
;
Zoltán Végváry
4
;
Emőke Borzasi
4
;
Zsófia Együd
4
;
Renáta Kószó
4
;
Viktor Paczona
4
;
Emese Fodor
4
;
Chad Bobb
5
;
Cristina Cozzini
6
;
Sandeep Kaushik
6
;
Barbara Darázs
3
;
Gerda M. Verduijn
2
;
Rachel Pearson
7
;
Ross Maxwell
7
;
Hazel Mccallum
7
;
Juan A. Hernandez Tamames
8
;
Katalin Hideghéty
4
;
Steven F. Petit
2
and
Florian Wiesinger
6
Affiliations:
1
GE Healthcare, Budapest, Hungary
;
2
Erasmus MC Cancer Institute, Department of Radiation Oncology, Rotterdam, The Netherlands
;
3
GE Healthcare, Szeged, Hungary
;
4
University of Szeged, Department of Oncotherapy, Szeged, Hungary
;
5
GE Healthcare, Milwaukee, U.S.A.
;
6
GE Healthcare, Munich, Germany
;
7
Newcastle University, Northern Institute for Cancer Research, Newcastle, U.K.
;
8
Erasmus MC, Department of Radiology and Nuclear Medicine, Rotterdam, The Netherlands
Keyword(s):
Organ-at-Risk, Head, Radiation Therapy, MRI, Segmentation, Deep Learning, U-Net.
Abstract:
Segmentation of organs-at-risk (OAR) in MR images has several clinical applications; including radiation
therapy (RT) planning. This paper presents a deep-learning-based method to segment 15 structures in the head
region. The proposed method first applies 2D U-Net models to each of the three planes (axial, coronal,
sagittal) to roughly segment the structure. Then, the results of the 2D models are combined into a fused
prediction to localize the 3D bounding box of the structure. Finally, a 3D U-Net is applied to the volume of
the bounding box to determine the precise contour of the structure. The model was trained on a public dataset
and evaluated on both public and private datasets that contain T2-weighted MR scans of the head-and-neck
region. For all cases the contour of each structure was defined by operators trained by expert clinical
delineators. The evaluation demonstrated that various structures can be accurately and efficiently localized
and segmented using the prese
nted framework. The contours generated by the proposed method were also
qualitatively evaluated. The majority (92%) of the segmented OARs was rated as clinically useful for radiation
therapy.
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