RF heating measurement using MR thermometry and field monitoring: Methodological considerations and first in vivo results

2020 ◽  
Vol 85 (3) ◽  
pp. 1282-1293
Author(s):  
Caroline Le Ster ◽  
Franck Mauconduit ◽  
Christian Mirkes ◽  
Michel Bottlaender ◽  
Fawzi Boumezbeur ◽  
...  
Keyword(s):  
Field Monitoring ◽  
Rf Heating ◽  
Mr Thermometry ◽  
Methodological Considerations

Improved MR Thermometry to Measure Brain Temperatures

2008 ◽  
Author(s):  
Devashish Shrivastava ◽  
Lance DelaBarre ◽  
Timothy Hanson ◽  
J. Thomas Vaughan
Keyword(s):  
High Field ◽  
Core Body Temperature ◽  
Temperature Response ◽  
Time History ◽  
Rf Heating ◽  
Mr Thermometry ◽  
Ultra High Field ◽  
High Fields ◽  
Rf Safety

An MR thermometry technique with sub-degree celsius accuracy is needed to measure in vivo temperatures vs. time in porcine brains at ultra-high fields. Porcine models are used to study thermoregulatory temperature response of the ultra-high field radiofrequency (RF) heating. The porcine hot critical temperature limit is comparable to and lower than that of humans. Also, porcine thermoregulatory mechanisms are similar to humans. Thus, conservative porcine thermoregulatory temperature responses can help develop new RF safety thresholds for ultra-high field human MRI. Sub-degree C temperature accuracy is needed since RF safety guidelines limit the maximum in vivo head temperature change due to RF heating to 1 °C over the core body temperature. Three-dimensional temperature maps over time are required since non-uniform RF power deposition at ultra-high fields and blood flow produce non-uniform in vivo temperatures with local hot spots. Thermogenic hazards are related to in vivo temperatures and temperature-time history — and not to the typically measured whole head average specific absorption rate.

In vivo T2 -based MR thermometry in adipose tissue layers for high-intensity focused ultrasound near-field monitoring

2013 ◽  
Vol 72 (4) ◽  
pp. 1057-1064 ◽  
Author(s):  
Paul Baron ◽  
Mario Ries ◽  
Roel Deckers ◽  
Martijn de Greef ◽  
Jukka Tanttu ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
High Intensity ◽  
Focused Ultrasound ◽  
Near Field ◽  
Field Monitoring ◽  
High Intensity Focused Ultrasound ◽  
Mr Thermometry

Fast PRF-based MR thermometry using double-echo EPI: in vivo comparison in a clinical hyperthermia setting

2014 ◽  
Vol 28 (4) ◽  
pp. 305-314 ◽  
Author(s):  
Tetiana Dadakova ◽  
Johanna Gellermann ◽  
Otilia Voigt ◽  
Jan Gerrit Korvink ◽  
John Matthew Pavlina ◽  
...  
Keyword(s):  
Mr Thermometry

In Vivo MR Thermometry of Frozen Tissue Using R2* and Signal Intensity1

2005 ◽  
Vol 12 (9) ◽  
pp. 1080-1084 ◽  
Author(s):  
Janaka P. Wansapura ◽  
Bruce L. Daniel ◽  
Karl K. Vigen ◽  
Kim Butts
Keyword(s):  
Mr Thermometry ◽  
Frozen Tissue

scholarly journals A transmit/receive system for magnetic field monitoring of in vivo MRI

2009 ◽  
Vol 62 (1) ◽  
pp. 269-276 ◽  
Author(s):  
Christoph Barmet ◽  
Nicola De Zanche ◽  
Bertram J. Wilm ◽  
Klaas P. Pruessmann
Keyword(s):  
Magnetic Field ◽  
Field Monitoring ◽  
Receive System

Measurement of the Endogenous Adenosine Concentration in Humans In Vivo: Methodological Considerations

2008 ◽  
Vol 9 (8) ◽  
pp. 679-685 ◽  
Author(s):  
B. Ramakers ◽  
P. Pickkers ◽  
A. Deussen ◽  
G. Rongen ◽  
P. Broek ◽  
...  
Keyword(s):  
Endogenous Adenosine ◽  
Adenosine Concentration ◽  
Methodological Considerations

In vivo determinants of arterial biophysical properties: methodological considerations

1997 ◽  
Vol 135 (2) ◽  
pp. 263-267 ◽  
Author(s):  
E.D Lehmann ◽  
R.G Gosling
Keyword(s):  
Biophysical Properties ◽  
Methodological Considerations

In vivo voltammetry: Some methodological considerations

1986 ◽  
Vol 17 (1) ◽  
pp. 1-29 ◽  
Author(s):  
Jonathan A. Stamford
Keyword(s):  
In Vivo Voltammetry ◽  
Methodological Considerations

In vivo determinants of arterial biophysical properties: methodological considerations

1997 ◽  
Vol 135 (2) ◽  
pp. 269
Author(s):  
A.M Dart ◽  
X.L Qi ◽  
J.D Cameron
Keyword(s):  
Biophysical Properties ◽  
Methodological Considerations
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