dr. daniel kopans is a leading expert in breast cancer detection and diagnosis. he is the founder of the breast imaging division in the department of radiology at the massachusetts general hospital. in 1984 he was the lead author on a paper in the new england journal of medicine describing the developing subspecialty of "breast imaging". one of the founders of this new field, dr. kopans has been at the forefront of combining mammography, ultrasound, and other imaging tests to aid in the detection and diagnosis of breast cancer. dr. kopans led the defense of screening for women ages 40–49 when an effort was made, in the 1990s, to deny these women access to screening.