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 - Ultrasound, women's health

Citing the possibility of tissue heating, cavitation and inherent risks of untrained use, the U.S. Food and Drug Administration has discouraged pregnant women from getting keepsake ultrasounds and from using over-the-counter Doppler fetal ultrasound monitors.

 - merger, acquisition, money, handshake

Royal Philips will pay $1 billion to acquire the catheter-based imaging company Volcano Corp. The deal is scheduled to close in the first quarter of 2015.

 - heart valves

Frequent echocardiography may not be needed for patients with asymptomatic, moderate aortic or mitral regurgitation, according to a study published online Dec. 10 in the Journal of the American College of Cardiology: Cardiovascular Imaging.

 - doctor communication

Communication between radiologists and referring physicians improved when a standard certainty lexicon was implemented for routine staging prostate MRI exams, according to a study published this month in the American Journal of Roentgenology.

 - Contract

Half of  accountable care organization (ACO) providers hold contracts with private insurers, according to a study published in the December edition of the American Journal of Managed Care. The analysis is one of the first to shed light on the nature of ACO contracts with commercial payers.