- Women of childbearing potential who are not surgically sterile, not refraining from sexual activity, or not using reliable methods of contraception. Women of childbearing potential must not be pregnant (negative serum beta-hCG [human chorionic gonadotropin] at the time of screening and negative urine beta-hCG on the day of imaging) or lactating at screening. Women must avoid becoming pregnant, and must agree to refrain from sexual activity or to use reliable contraceptive methods for 30 days prior to and 30 days after administration of radiopharmaceutical imaging agents in this study. In order to participate in this study, sexually active females must be either: two or more years post-menopausal or surgically sterilized, or must be using an acceptable form of contraception (oral contraceptives for at least three months or an IUD (intrauterine device) for at least two months prior to the start of the screening visit, or various barrier methods, e.g., diaphragm or combination condom and spermicide).