Towards Automatic Bone Age Estimation from MRI: Localization of 3D Anatomical Landmarks
Bone age estimation (BAE) is an important procedure in forensic practice which recently has seen a shift in attention from X-ray to MRI based imaging. To automate BAE from MRI, localization of the joints between hand bones is a crucial first step, which is challenging due to anatomical variations, different poses and repeating structures within the hand. We propose a landmark localization algorithm using multiple random regression forests, first analyzing the shape of the hand from information of the whole image, thus implicitly modeling the global landmark configuration, followed by a refinement based on more local information to increase prediction accuracy. We are able to clearly outperform related approaches on our dataset of 60 T1-weighted MR images, achieving a mean landmark localization error of 1.4±1.5mm, while having only 0.25% outliers with an error greater than 10mm.
KeywordsDetection Step Landmark Localization Landmark Position Landmark Detection Hand Bone
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