title: Performance of a miniature magnetic position sensor for three-dimensional ultrasound imaging.
abstract: 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.
authors.affiliation: Center for Bioengineering, University of Washington, Seattle 98195, USA.
authors.forename: D F
authors.initials: DF
authors.lastname: Leotta
authors.forename: P R
authors.initials: PR
authors.lastname: Detmer
authors.forename: R W
authors.initials: RW
authors.lastname: Martin
mesh_terms: 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
chemical_list: D008670:Metals