Design and in vitro evaluation of a real-time catheter localization system using time of flight measurements from seven 3.5 MHz single element ultrasound transducers towards abdominal aortic aneurysm procedures |
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Authors: | Mung Jay Han Sukgu Yen Jesse T |
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Institution: | a Department of Biomedical Engineering, Viterbi School of Engineering, 1042 Downey Way, Denney Research Center (DRB), 140, Los Angeles, CA 90089, USA b CardioVascular Thoracic Institute, Keck School of Medicine, Healthcare Consultation Center I, 1510 San Pablo Street, Suite 322, Los Angeles, CA 90033, USA c University of Southern California, Los Angeles, CA, USA |
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Abstract: | Interventional surgical instrument localization is a crucial component of minimally invasive surgery. Image guided surgery researchers are investigating devices broadly categorized as surgical localizers to provide real-time information on the instrument’s 3D location and orientation only. This paper describes the implementation and in vitro evaluation of a prototype real-time nonimaging ultrasound-based catheter localizer system towards use in abdominal aortic aneurysm procedures. The catheter-tip is equipped with a single element ultrasound transducer which is tracked with an array of seven external single element transducers. The performance of the system was evaluated in a water tank and additionally in the presence of pork belly tissue and also a nitinol-dacron stent graft. The mean root mean square errors were respectively 1.94 ± 0.06, 2.54 ± 0.31 and 3.33 ± 0.06 mm. In addition, this paper illustrates errors induced by transducer aperture size and suggests a method for aperture error compensation. Aperture compensation applied to the same experimental data yielded mean root mean square errors of 1.05 ± 0.07, 2.42 ± 0.33 and 3.23 ± 0.07 mm respectively for water; water and pork; and water, pork and stent experiments. Lastly, this paper presents a video showing free-hand movement of the catheter within the water tank with data capture at 25 frames per second. |
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Keywords: | Catheter Localization Real-time Tracker AAA |
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