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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 2.

Geometric characterization of the CT-based and landmark-based positioning strategies for both transducers. Mean values ± standard deviation are presented.

120-kHz transducer 500-kHz transducer
CT-based Landmark CT-based Landmark
Distance between transducer center and centroid of M1 (mm) 53.7±4.5* 56.8±4.6* 54.4±4.9+ 56.8±4.6+
Bone thickness along the central axis of the transducer (mm) 2.5±0.7*^ 3.0±1.0* 2.8±0.6^ 2.9±0.9
Mean distance between M1 and transducer axis (mm) 4.0 ±1.1*^ 7.2 ±3.0* 3.3 ±0.7+^ 7.2±2.9+
*,^,+

indicate pairs with significant statistical difference (p<0.05)