title: Learning without labeling: domain adaptation for ultrasound transducer localization.
abstract: The fusion of image data from trans-esophageal echography (TEE) and X-ray fluoroscopy is attracting increasing interest in minimally-invasive treatment of structural heart disease. In order to calculate the needed transform between both imaging systems, we employ a discriminative learning based approach to localize the TEE transducer in X-ray images. Instead of time-consuming manual labeling, we generate the required training data automatically from a single volumetric image of the transducer. In order to adapt this system to real X-ray data, we use unlabeled fluoroscopy images to estimate differences in feature space density and correct covariate shift by instance weighting. An evaluation on more than 1900 images reveals that our approach reduces detection failures by 95% compared to cross validation on the test set and improves the localization error from 1.5 to 0.8 mm. Due to the automatic generation of training data, the proposed system is highly flexible and can be adapted to any medical device with minimal efforts.
authors: Siemens AG, Corporate Technology, Erlangen, Germany.
authors: Tobias
authors: T
authors: Heimann
authors: Siemens Corporation, Corporate Technology, Princeton, NJ, USA.
authors: Peter
authors: P
authors: Mountney
authors: Siemens AG, Healthcare Sector, Forchheim, Germany.
authors: Matthias
authors: M
authors: John
authors: Siemens Corporation, Corporate Technology, Princeton, NJ, USA.
authors: Razvan
authors: R
authors: Ionasec
mesh_terms: D000465:Algorithms; D005471:Fluoroscopy / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D064847:Multimodal Imaging / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013194:Staining and Labeling; D014159:Transducers; D018084:Ultrasonography, Interventional / Q000295:instrumentation* / Q000379:methods*