Calibration for position tracking of swept motor 3-D ultrasound.
Tracking the position and orientation of a 3-D ultrasound transducer has many clinical applications. Tracking requires calibration to find the transformation between the tracking sensor and the ultrasound coordinates. Typically the set of image slice data are scan converted to a Cartesian volume using assumed motor geometry and a single transformation to the sensor. We propose, instead, the calibration of individual slices using a 2-D calibration technique. A best fit to a subset of slices is performed to decrease data collection time compared with that for calibration of all slices, and to reduce the influence of random errors in individual calibrations. We compare our technique with four scan conversion-based techniques: 2-D N-wire on the center slice, N-wire using a 3-D volume, N-wire using a 3-D volume including the edge points and a new closed-form planar method using a 3-D volume. The proposed multi-slice technique produced the smallest point reconstruction error (0.82 mm using a tracked stylus).
Department of Mechanical Engineering, University of British Columbia, Vancouver, British Columbia, Canada. Electronic address: jeffa@ece.ubc.ca.
Jeffrey M
JM
Abeysekera
Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, British Columbia, Canada.
Mohammad
M
Najafi
Department of Mechanical Engineering, University of British Columbia, Vancouver, British Columbia, Canada; Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, British Columbia, Canada.
Robert
R
Rohling
Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, British Columbia, Canada.
Septimiu E
SE
Salcudean
D000465:Algorithms; D002138:Calibration; D004867:Equipment Design; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000379:methods*; D015203:Reproducibility of Results; D014159:Transducers; D014463:Ultrasonography / Q000379:methods*
Calibration; Tracking; Ultrasound