Random calibration for accelerating MR-ARFI guided ultrasonic focusing in transcranial therapy
نویسندگان
چکیده
منابع مشابه
Random calibration for accelerating MR-ARFI guided ultrasonic focusing in transcranial therapy.
Transcranial focused ultrasound is a promising therapeutic modality. It consists of placing transducers around the skull and emitting shaped ultrasound waves that propagate through the skull and then concentrate on one particular location within the brain. However, the skull bone is known to distort the ultrasound beam. In order to compensate for such distortions, a number of techniques have be...
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A particularly critical issue for brain therapy with transcranial high-power focused ultrasound (HIFU) is to optimize the accuracy and rapidity of the temperature follow-up during the heating. MRI is a well-suited candidate for temperature monitoring since it offers several parameters such as the proton resonance frequency shift. Up-to-now, temperature scans were achieved using the standard bod...
متن کاملOptimization of encoding gradients for MR-ARFI.
MR acoustic radiation force imaging provides a promising method to monitor therapeutic ultrasound treatments. By measuring the displacement induced by the acoustic radiation force, MR acoustic radiation force imaging can locate the focal spot, without a significant temperature rise. In this work, the encoding gradient for MR acoustic radiation force imaging is optimized to achieve an enhanced a...
متن کاملHigh power transcranial beam steering for ultrasonic brain therapy.
A sparse phased array is specially designed for non-invasive ultrasound transskull brain therapy. The array is made of 200 single elements corresponding to a new generation of high power transducers developed in collaboration with Imasonic (Besançon, France). Each element has a surface of 0.5 cm2 and works at 0.9 MHz central frequency with a maximum 20 W cm(-2) intensity on the transducer surfa...
متن کاملMR-guided adaptive focusing of therapeutic ultrasound beams in the human head.
PURPOSE This study aims to demonstrate, using human cadavers the feasibility of energy-based adaptive focusing of ultrasonic waves using magnetic resonance acoustic radiation force imaging (MR-ARFI) in the framework of non-invasive transcranial high intensity focused ultrasound (HIFU) therapy. METHODS Energy-based adaptive focusing techniques were recently proposed in order to achieve aberrat...
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ژورنال
عنوان ژورنال: Physics in Medicine and Biology
سال: 2015
ISSN: 0031-9155,1361-6560
DOI: 10.1088/0031-9155/60/3/1069