@conference {Boctor2006,
	title = {Ultrasound self-calibration},
	booktitle = {Medical Imaging 2006: Visualization, Image-Guided Procedures, and Display},
	volume = {6141},
	number = {1},
	year = {2006},
	pages = {61412N},
	publisher = {SPIE},
	organization = {SPIE},
	doi = {10 1117/12 659594},
	url = {http://link aip org/link/?PSI/6141/61412N/1},
	author = {Emad Boctor and Iulian Iordachita and Gabor Fichtinger and Gregory D. Hager}
}
