منابع مشابه
Referenceless PRF shift thermometry.
The proton resonance frequency (PRF) shift provides a means of measuring temperature changes during minimally invasive thermotherapy. However, conventional PRF thermometry relies on the subtraction of baseline images, which makes it sensitive to tissue motion and frequency drift during the course of treatment. In this study, a new method is presented that eliminates these problems by estimating...
متن کاملHybrid multi-baseline and referenceless PRF-shift thermometry
Introduction Proton resonance frequency (PRF)-shift MR thermometry is a promising tool for guiding thermal therapies in the treatment of liver tumors and heart arrhythmias, but is complicated by organ motion and respiration. To address motion, multi-baseline subtraction techniques have been proposed [1,2] that use a library of pre-treatment baseline images covering the cardiac and respiratory c...
متن کاملPRF based MR-Thermometry on Abdominal Organs: A pragmatic comparison of referenceless vs multi-baseline
Introduction Reliable temperature and thermal-dose measurements using PRF based MR-thermometry for MR-guided ablation therapy on abdominal organs are complicated by the fact that the target moves through an inhomogeneous and time-variant magnetic field. Two correction approaches emerged recently as the most promising candidates to allow continuous real-time MR-thermometry under free-breathing c...
متن کاملImproved k-space-based MR thermometry by joint PRF phase shift and T1/T2* attenuation estimation
Background/introduction MR temperature mapping based on the proton resonance frequency (PRF) shift is used in MR-guided focused ultrasound procedures for dosimetry and safety monitoring. While conventional PRF-shift thermometry is based on calculating a phase difference between two reconstructed MR images, Gaur et al [1,2] have recently described two algorithms that estimate temperatureinduced ...
متن کاملVelocity Navigator Triggering for Motion Compensated PRF Thermometry
Introduction MR-guidance is increasingly used for thermo-therapies such as radio frequency, laser (LITT) or focused ultrasound ablation, because MR allows for non-invasive temperature measurements. In the most commonly applied proton resonance frequency (PRF) shift thermometry, temperature differences are calculated based on phase variations with respect to a reference baseline. Since there is ...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2004
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.20090