Dr. Germain Y.S. Hwang Profile

Dr. Germain Y.S. Hwang

at Sunnybrook Research Institute

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Proceedings Article | 8 March 2019 Paper

Ultrasound calibration for unique 2.5D conical images

Hareem Nisar, John Moore, Natasha Alves, Germain Hwang, Terry Peters, Elvis C. Chen

Proceedings Volume 10951, 1095126 (2019) https://doi.org/10.1117/12.2506193

KEYWORDS: Calibration, Ultrasonography, 3D image processing, Imaging systems, Sensors, Data acquisition, Precision calibration, Magnetic tracking

Read Abstract +

Intracardiac echocardiography (ICE) systems are routinely used in percutaneous cardiac interventions for interventional and surgical navigation. Conavi's Foresight ICE is a new ICE system that uses a mechanically rotating transducer to generate a 2D conical surface image in 3D space, in contrast to the more typical side-firing phased array. When combined with magnetic tracking technology, this unique imaging geometry poses new calibration challenges and opportunities. Existing ultrasound calibration methods are designed for 2D planar images and cannot be trivially applied to unique 2:5D conical surface images provided by the Foresight ICE system. In this work a spatial and temporal calibration technique applied to the unique case of conical ultrasound image data is described and validated. Precision of calibration parameters is used to quantify the validation of our calibration method and the overall system accuracy is validated using point source and sphere centroid localization. We re- port a maximum error of 5:07mm for point reconstruction accuracy and 1:94mm for sphere centroid localization accuracy.

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