title: Extended-field-of-view three-dimensional transesophageal echocardiography using image-based X-ray probe tracking.
abstract: The use of ultrasound imaging for guidance of cardiac interventional procedures is limited by the small field of view of the ultrasound volume. A larger view can be created by image-based registration of several partially overlapping volumes, but automatic registration is likely to fail unless the registration is initialized close to the volumes' correct alignment. In this article, we use X-ray images to track a transesophageal ultrasound probe and thereby provide initial position information for the registration of the ultrasound volumes. The tracking is possible using multiple X-rays or just a single X-ray for each probe position. We test the method in a phantom experiment and find that with at least 50% overlap, 88% of volume pairs are correctly registered when tracked using three X-rays and 86% when using single X-rays. Excluding failed registrations with errors greater than 10 mm, the average registration accuracy is 2.92 mm between ultrasound volumes and 4.75 mm for locating an ultrasound volume in X-ray space. We conclude that the accuracy and robustness of the registrations are sufficient to provide useful images for interventional guidance.
authors: Division of Imaging Sciences and Biomedical Engineering, King's College London, UK. richard.housden@kcl.ac.uk
authors: R James
authors: RJ
authors: Housden
authors: Yingliang
authors: Y
authors: Ma
authors: Aruna
authors: A
authors: Arujuna
authors: Niels
authors: N
authors: Nijhof
authors: Pascal
authors: P
authors: Cathier
authors: Geert
authors: G
authors: Gijsbers
authors: Roland
authors: R
authors: Bullens
authors: Jaswinder
authors: J
authors: Gill
authors: C Aldo
authors: CA
authors: Rinaldi
authors: Victoria
authors: V
authors: Parish
authors: Kawal S
authors: KS
authors: Rhode
mesh_terms: D019560:Echocardiography, Three-Dimensional / Q000295:instrumentation / Q000379:methods*; D017548:Echocardiography, Transesophageal / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D064847:Multimodal Imaging / Q000295:instrumentation / Q000379:methods*; D019047:Phantoms, Imaging; D015641:Radiography, Interventional / Q000295:instrumentation / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013382:Subtraction Technique; D018084:Ultrasonography, Interventional / Q000295:instrumentation / Q000379:methods*