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Heart disease today By : Hon Diseases of the heart and vessels at present occupy a leading position on the frequency of development and mortality. CT Heart Scans Cut X-ray Dose To Patients, Study Says By : Mason Weiss Heart scans that detect blocked arteries can be performed with half the amount of radiation exposure to patients to make them safer, according to Bloomberg news. The Michigan study measured the radiation dose from heart CT scans of 4,862 patients in 15 hospitals from July 2007 to April 2008. A quality control program lowered the median radiation dose -- expressed in units known as millisieverts --to 10 from 21, according to a study in the Journal of the American Medical Association. The full body scans produced good quality diagnostic images, the study authors said.