Performance of a miniature magnetic position sensor for three-dimensional ultrasound imaging.
A miniature magnetic position sensor used for three-dimensional ultrasound imaging was tested for precision and accuracy in vitro. The sensor alone was able to locate points with root-mean-square (rms) uncertainty of 1.7 mm and accuracy of 0.05 +/- 0.62 mm over its specified operating range of 50 cm. With an ultrasound imaging system, a point was located from arbitrary viewing windows with 2.4-mm rms uncertainty and 0.06 +/- 0.68 mm accuracy. If viewing windows were limited to those representative of a typical ultrasound examination, the system could achieve rms uncertainty in point location of < 1 mm. Performance was not affected by operation of the imaging system when the sensor was mounted on an ultrasound scanhead. Sensitivity to metals in the operating environment was also measured.
Leotta
D F
DF
Center for Bioengineering, University of Washington, Seattle 98195, USA.
Detmer
P R
PR
Martin
R W
RW
D002138:Calibration; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D008280:Magnetics; D008670:Metals; D008904:Miniaturization; D014463:Ultrasonography / Q000295:instrumentation* / Q000379:methods
D008670:Metals