Table 1.

Mean localization errors relative to skin marks for all ultrasound patients (2000–2007) and Calypso patients from the clinical trial.

	Number of Localization Procedures	Lateral (mm)	Vertical (mm)	Longitudinal (mm)
Calypso	640	$-1.26\pm 5.64$	$-4.26\pm 6.37$	$-0.73\pm 3.77$
Ultrasound	829	$0.17\pm 3.80$	$-0.66\pm 4.34$	$0.76\pm 4.75$