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. Author manuscript; available in PMC: 2015 Jun 1.
Published in final edited form as: Ultrasound Med Biol. 2014 Mar 14;40(6):1154–1166. doi: 10.1016/j.ultrasmedbio.2013.12.025

Table 3.

Evaluation of the simulated fields using the metrics defined by equations 1–6, for the CT-based and landmark-based positioning strategies and both the 120-kHz and 500-kHz transducers. Mean values ± standard deviation are shown.

120-kHz transducer 500-kHz transducer
Metric CT-based Landmark CT-based Landmark
maxPM1 (%) 53.9±10.5* 48.6±10.6* 50.1±11.2+ 41.4±17.8+
stdPM1 (%) 21.5±4.3^ 23.44±5.1 47.5±12.5+^ 65.5±14.1+
relPM1 (%) ±18.0 ±21.3 ±26.4+ ±47.9+
Rproximal 2.6±0.6^ 2.8±0.7 2.0±0.7+^ 2.9±1.9+
Rdistal 0.8±0.1*^ 1.0±0.2* 0.3±0.1^ 0.3±0.1
ΔTmax (°C) 3.8±2.2*^ 6.1±3.9* 13.4±3.3+^ 18.4±4.2+
*,^,+

indicate pairs with significant statistical difference (p<0.05)