A fast referenceless PRFS-based MR thermometry by phase finite difference
نویسندگان
چکیده
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...
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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...
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Of the various techniques employed to quantify temperature changes by MR, proton resonance frequency (PRF) shift-based phase-difference imaging (PDI) is the most accurate and widely used. However, PDI is associated with various artifacts. Motivated by these limitations, we developed a new method to monitor temperature changes by MRI using the balanced steady-state free precession (balanced-SSFP...
متن کاملMR thermometry in moving objects using a novel referenceless and user-independent approach
Introduction: The simplest way to generate temperature maps based on proton resonance frequency shifts involves phase subtractions with a prior-to-heating time frame. In the presence of motion this approach is not practical, as many changes may occur in time besides heating. The referenceless approach [1-3] has proved very effective for generating temperature measurements in moving objects, but...
متن کاملThe magnetic susceptibility effect of gadolinium-based contrast agents on PRFS-based MR thermometry during thermal interventions
BACKGROUND Proton resonance frequency shift (PRFS) magnetic resonance (MR) thermometry exploits the local magnetic field changes induced by the temperature dependence of the electron screening constant of water protons. Any other local magnetic field changes will therefore translate into incorrect temperature readings and need to be considered accordingly. Here, we investigated the susceptibili...
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ژورنال
عنوان ژورنال: Physics in Medicine and Biology
سال: 2013
ISSN: 0031-9155,1361-6560
DOI: 10.1088/0031-9155/58/16/5735