MQSA Frequently Asked Questions for Digital Mammography
http://www.fda.gov/CDRH/MAMMOGRAPHY/dig-faq.html

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U.S. National Institutes Of Health
Digital vs. Film Mammography in the Digital Mammographic Imaging Screening Trial (DMIST): Questions and Answers
http://www.cancer.gov/newscenter/pressreleases/DMISTQandA

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National Breast Cancer Foundation
http://www.nationalbreastcancer.org/

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American Cancer Society
http://www.cancer.org

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American Registry of Radiologic Technologists
ARRT is the world's largest credentialing organization that seeks to ensure high quality patient care in radiologic technology. They test and certify technologists and administer continuing education and ethics requirements for their annual registration.
http://www.arrt.org

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Medline – Plus, Breast Ultrasound
General information on the breast ultrasound
http://www.nlm.nih.gov/

Medline – Plus, Ultrasound
http://www.nlm.nih.gov/

Medline – Plus, Sleep Studies (Polysomnogram)
http://www.nlm.nih.gov/

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American Registry of Diagnostic Medical Sonographers
The American Registry for Diagnostic Medical Sonography® (ARDMS®), incorporated in June 1975, is an independent, nonprofit organization that administers examinations and awards credentials in the areas of diagnostic medical sonography, diagnostic cardiac sonography, vascular interpretation and vascular technology.
http://www.ardms.org