Dr. Lipson's prior research activities focused on radiation dose with CT and the associated risk of cancer. As an NIH-funded T32 Research Fellow under the mentorship of Dr. Rebecca Smith-Bindman, Dr. Lipson conducted a study of four Bay Area hospitals in which she reviewed 1,200 CT examinations and CT radiation dose reports; estimated the effective dose from each examination; and calculated the associated risk of cancer attributable to that effective dose.