Benoit Larrat1, Benjamin Marty1, Mathieu Pernot2, Mickael Tanter2, Franck Lethimonnier1, Sbastien Mriaux1
In this work, blood brain barrier was opened in rats using focusing ultrasound under 7T MRI guidance. Displacements induced by the acoustic radiation force were imaged with a motion sensitized sequence. After injection of a Gd chelate contrast agent, T1 maps were acquired from which quantitative Gd concentration images were derived. The relationship between acoustic intensity and penetration of contrast agent in cerebral tissue was investigated. Our data show that radiation force imaging is an efficient guiding tool to adjust the quantity of delivered drug or contrast agent with ultrasound induced blood brain barrier disruption.