'''By Ross Kerber, Globe Staff | August 15, 2005
Medical imaging companies want to give regulators a clearer picture of their work.
Stung by criticism from insurers and hospitals that costs are out of control for magnetic-resonance imaging and ...'
'''Johns Hopkins scientists have found that modern implanted heart devices -- such as pacemakers and defibrillators -- are safe for use in magnetic resonance imaging (MRI) machines, a diagnostic and imaging tool long ruled potentially unsafe and off-limits ...'