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Influence of water and fat heterogeneity on fat-referenced MR thermometry
Magnetic resonance in medicine, 2016-03, Vol.75 (3), p.1187-1197
Baron, Paul
Deckers, Roel
Bouwman, Job G.
Bakker, Chris J. G.
de Greef, Martijn
Viergever, Max A.
Moonen, Chrit T. W.
Bartels, Lambertus W.
2016
Details
Autor(en) / Beteiligte
Baron, Paul
Deckers, Roel
Bouwman, Job G.
Bakker, Chris J. G.
de Greef, Martijn
Viergever, Max A.
Moonen, Chrit T. W.
Bartels, Lambertus W.
Titel
Influence of water and fat heterogeneity on fat-referenced MR thermometry
Ist Teil von
Magnetic resonance in medicine, 2016-03, Vol.75 (3), p.1187-1197
Ort / Verlag
United States: Blackwell Publishing Ltd
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
Purpose To investigate the effect of the aqueous and fatty tissue magnetic susceptibility distribution on absolute and relative temperature measurements as obtained directly from the water/fat (w/f) frequency difference. Methods Absolute thermometry was investigated using spherical phantoms filled with pork and margarine, which were scanned in three orthogonal orientations. To evaluate relative fat referencing, multigradient echo scans were acquired before and after heating pork tissue via high‐intensity focused ultrasound (HIFU). Simulations were performed to estimate the errors that can be expected in human breast tissue. Results The sphere experiment showed susceptibility‐related errors of 8.4°C and 0.2°C for pork and margarine, respectively. For relative fat referencing measurements, fat showed pronounced phase changes of opposite polarity to aqueous tissue. The apparent mean temperature for a numerical breast model assumed to be 37°C was 47.2 ± 21.6°C. Simulations of relative fat referencing for a HIFU sonication (ΔT = 29.7°C) yielded a maximum temperature error of 6.6°C compared with 2.5°C without fat referencing. Conclusion Variations in the observed frequency difference between water and fat are largely due to variations in the w/f spatial distribution. This effect may lead to considerable errors in absolute MR thermometry. Additionally, fat referencing may exacerbate rather than correct for proton resonance frequency shift–temperature measurement errors. Magn Reson Med 75:1187–1197, 2016. © 2015 Wiley Periodicals, Inc.
Sprache
Englisch
Identifikatoren
ISSN: 0740-3194
eISSN: 1522-2594
DOI: 10.1002/mrm.25727
Titel-ID: cdi_proquest_miscellaneous_1776671353
Format
–
Schlagworte
absolute thermometry
,
Breast - diagnostic imaging
,
Computer Simulation
,
fat referenced thermometry
,
Fats - chemistry
,
Female
,
Frequency shift
,
Heterogeneity
,
Humans
,
Magnetic permeability
,
Magnetic Resonance Imaging - methods
,
Magnetic susceptibility
,
Margarine
,
Models, Biological
,
MR thermometry
,
MR-HIFU
,
Phantoms, Imaging
,
Phase transitions
,
Polarity
,
Pork
,
Proton resonance
,
Referencing
,
Sonication
,
Spatial distribution
,
Temperature effects
,
Temperature measurement
,
Thermography - methods
,
Thermometry
,
Tissues
,
Ultrasound
,
Water - chemistry
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