Actuator-Assisted Calibration of Freehand 3D Ultrasound System

Table 5

Comparison of data acquisition time among calibration approaches.

	Freehand cross wire	Actuator assisted cross wire	Actuator assisted collinear point targets	Actuator assisted modified collinear point targets
Mean (SD) (minutes)	26.2 (5.1)	26.0 (4.0)	12.8 (3.4)	11.1 (3.7)

For each approach, mean (SD) was based on 10 calibration trials. One-way ANOVA revealed a significant difference among calibration approaches. Post hoc analysis further revealed that data acquisition time for both actuator-based collinear point targets and modified collinear point target phantom calibrations was significantly shorter than that for the traditional freehand cross wire phantom calibration ( for each paired comparison). There was no significant difference in data acquisition time between freehand and actuator-assisted cross wire phantom calibration.