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Three‐dimensional spatial and temporal temperature control with MR thermometry‐guided focused ultrasound (MRgHIFU)
Author(s) -
Mougenot Charles,
Quesson Bruno,
de Senneville Baudouin Denis,
de Oliveira Philippe Lourenco,
Sprinkhuizen Sara,
Palussière Jean,
Grenier Nicolas,
Moonen Chrit T.W.
Publication year - 2009
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.21887
Subject(s) - overshoot (microwave communication) , temperature control , voxel , pid controller , perpendicular , ultrasound , volume (thermodynamics) , beam (structure) , materials science , temperature measurement , trajectory , nuclear magnetic resonance , biomedical engineering , physics , acoustics , optics , computer science , mathematics , artificial intelligence , geometry , medicine , telecommunications , quantum mechanics , thermodynamics , astronomy
High‐intensity focused ultrasound (HIFU) is an efficient noninvasive technique for local heating. Using MRI thermal maps, a proportional, integral, and derivative (PID) automatic temperature control was previously applied at the focal point, or at several points within a plane perpendicular to the beam axis using a multispiral focal point trajectory. This study presents a flexible and rapid method to extend the spatial PID temperature control to three dimensions during each MR dynamic. The temperature in the complete volume is regulated by taking into account the overlap effect of nearby sonication points, which tends to enlarge the heated area along the beam axis. Volumetric temperature control in vitro in gel and in vivo in rabbit leg muscle was shown to provide temperature control with a precision close to that of the temperature MRI measurements. The proposed temperature control ensures heating throughout the volume of interest of up to 1 ml composed of 287 voxels with 95% of the energy deposited within its boundaries and reducing the typical average temperature overshoot to 1°C. Magn Reson Med, 2009. © 2008 Wiley‐Liss, Inc.