The ISC is part of the Johns Hopkins Applied Physics Laboratory and will follow all current policies. Please visit the JHU/APL page for more information on the Lab's visitor guidance.

2018

X-ray-transform Invariant Anatomical Landmark Detection for Pelvic Trauma Surgery


Abstract

X-ray image guidance enables percutaneous alternatives to complex procedures. Unfortunately, the indirect view onto the anatomy in addition to projective simplification substantially increase the task-load for the surgeon. Additional 3D information such as knowledge of anatomical landmarks can benefit surgical decision making in complicated scenarios. Automatic detection of these landmarks in transmission imaging is challenging since image-domain features characteristic to a certain landmark change substantially depending on the viewing direction. Consequently and to the best of our knowledge, the above problem has not yet been addressed. In this work, we present a method to automatically detect anatomical landmarks in X-ray images independent of the viewing direction. To this end, a sequential prediction framework based on convolutional layers is trained on synthetically generated data of the pelvic anatomy to predict 23 landmarks in single X-ray images. View independence is contingent on training conditions and, here, is achieved on a spherical segment covering 120 ∘× 90 ∘ in LAO/RAO and CRAN/CAUD, respectively, centered around AP. On synthetic data, the proposed approach achieves a mean prediction error of 5.6±4.5 mm. We demonstrate that the proposed network is immediately applicable to clinically acquired data of the pelvis. In particular, we show that our intra-operative landmark detection together with pre-operative CT enables X-ray pose estimation which, ultimately, benefits initialization of image-based 2D/3D registration.

Citation

@incollectionBier_2018 doi: 10.1007/978-3-030-00937-3_7 url: https://doi.org/10.1007/978-3-030-00937-3_7 year: 2018 publisher: Springer International Publishing pages: 55--63 author: Bier Bastian and Unberath Mathias and Zaech Jan-Nico and Fotouhi Javad and Armand Mehran and Osgood Greg and Navab Nassir and Maier Andreas title: X-ray-transform Invariant Anatomical Landmark Detection for Pelvic Trauma Surgery booktitle: Medical Image Computing and Computer Assisted Intervention \textendash MICCAI 2018

Citation

@incollectionBier_2018 doi: 10.1007/978-3-030-00937-3_7 url: https://doi.org/10.1007/978-3-030-00937-3_7 year: 2018 publisher: Springer International Publishing pages: 55--63 author: Bier Bastian and Unberath Mathias and Zaech Jan-Nico and Fotouhi Javad and Armand Mehran and Osgood Greg and Navab Nassir and Maier Andreas title: X-ray-transform Invariant Anatomical Landmark Detection for Pelvic Trauma Surgery booktitle: Medical Image Computing and Computer Assisted Intervention \textendash MICCAI 2018