Radiofrequency heating studies on anesthetized swine using fractionated dipole antennas at 10.5 T

Yiğitcan Eryaman, Russell L. Lagore, M. Arcan Ertürk, Lynn Utecht, Patrick Zhang, Angel Torrado-Carvajal, Esra Abaci Türk, Lance Delabarre, Gregory J. Metzger, Gregor Adriany, Kâmil Uğurbil, J. Thomas Vaughan

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Purpose: To validate electromagnetic and thermal simulations with in vivo temperature measurements, and to demonstrate a framework that can be used to predict temperature increase caused by radiofrequency (RF) excitation with dipole transmitter arrays. Methods: Dipole arrays were used to deliver RF energy in the back/neck region of the swine using different RF excitation patterns (n = 2–4 per swine) for heating. The temperature in anesthetized swine (n = 3) was measured using fluoroscopic probes (n = 12) and compared against thermal modeling from animal-specific electromagnetic simulations. Results: Simulated temperature curves were in agreement with the measured data. The root mean square error between simulated and measured temperature rise at all locations (at the end of each RF excitation) is calculated as 0.37°C. The mean experimental temperature rise at the maximum temperature rise locations (averaged over all experiments) is calculated as 2.89°C. The root mean square error between simulated and measured temperature at the maximum temperature rise location is calculated as 0.57°C. (Error values are averaged over all experiments.). Conclusions: Electromagnetic and thermal simulations were validated with experiments. Thermal effects of RF excitation at 10.5 Tesla with dipoles were investigated. Magn Reson Med 79:479–488, 2018.

Original languageEnglish (US)
Pages (from-to)479-488
Number of pages10
JournalMagnetic resonance in medicine
Volume79
Issue number1
DOIs
StatePublished - Jan 2018

Fingerprint

Heating
Swine
Temperature
Electromagnetic Phenomena
Hot Temperature
Neck

Keywords

  • 10.5 T
  • SAR
  • dipole arrays
  • radiofrequency (RF)
  • temperature

Cite this

Radiofrequency heating studies on anesthetized swine using fractionated dipole antennas at 10.5 T. / Eryaman, Yiğitcan; Lagore, Russell L.; Ertürk, M. Arcan; Utecht, Lynn; Zhang, Patrick; Torrado-Carvajal, Angel; Türk, Esra Abaci; Delabarre, Lance; Metzger, Gregory J.; Adriany, Gregor; Uğurbil, Kâmil; Vaughan, J. Thomas.

In: Magnetic resonance in medicine, Vol. 79, No. 1, 01.2018, p. 479-488.

Research output: Contribution to journalArticle

Eryaman, Yiğitcan ; Lagore, Russell L. ; Ertürk, M. Arcan ; Utecht, Lynn ; Zhang, Patrick ; Torrado-Carvajal, Angel ; Türk, Esra Abaci ; Delabarre, Lance ; Metzger, Gregory J. ; Adriany, Gregor ; Uğurbil, Kâmil ; Vaughan, J. Thomas. / Radiofrequency heating studies on anesthetized swine using fractionated dipole antennas at 10.5 T. In: Magnetic resonance in medicine. 2018 ; Vol. 79, No. 1. pp. 479-488.
@article{0f5ae7a8d46b469085f2fe432553b2cb,
title = "Radiofrequency heating studies on anesthetized swine using fractionated dipole antennas at 10.5 T",
abstract = "Purpose: To validate electromagnetic and thermal simulations with in vivo temperature measurements, and to demonstrate a framework that can be used to predict temperature increase caused by radiofrequency (RF) excitation with dipole transmitter arrays. Methods: Dipole arrays were used to deliver RF energy in the back/neck region of the swine using different RF excitation patterns (n = 2–4 per swine) for heating. The temperature in anesthetized swine (n = 3) was measured using fluoroscopic probes (n = 12) and compared against thermal modeling from animal-specific electromagnetic simulations. Results: Simulated temperature curves were in agreement with the measured data. The root mean square error between simulated and measured temperature rise at all locations (at the end of each RF excitation) is calculated as 0.37°C. The mean experimental temperature rise at the maximum temperature rise locations (averaged over all experiments) is calculated as 2.89°C. The root mean square error between simulated and measured temperature at the maximum temperature rise location is calculated as 0.57°C. (Error values are averaged over all experiments.). Conclusions: Electromagnetic and thermal simulations were validated with experiments. Thermal effects of RF excitation at 10.5 Tesla with dipoles were investigated. Magn Reson Med 79:479–488, 2018.",
keywords = "10.5 T, SAR, dipole arrays, radiofrequency (RF), temperature",
author = "Yiğitcan Eryaman and Lagore, {Russell L.} and Ert{\"u}rk, {M. Arcan} and Lynn Utecht and Patrick Zhang and Angel Torrado-Carvajal and T{\"u}rk, {Esra Abaci} and Lance Delabarre and Metzger, {Gregory J.} and Gregor Adriany and K{\^a}mil Uğurbil and Vaughan, {J. Thomas}",
year = "2018",
month = "1",
doi = "10.1002/mrm.26688",
language = "English (US)",
volume = "79",
pages = "479--488",
journal = "Magnetic Resonance in Medicine",
issn = "0740-3194",
publisher = "John Wiley and Sons Inc.",
number = "1",

}

TY - JOUR

T1 - Radiofrequency heating studies on anesthetized swine using fractionated dipole antennas at 10.5 T

AU - Eryaman, Yiğitcan

AU - Lagore, Russell L.

AU - Ertürk, M. Arcan

AU - Utecht, Lynn

AU - Zhang, Patrick

AU - Torrado-Carvajal, Angel

AU - Türk, Esra Abaci

AU - Delabarre, Lance

AU - Metzger, Gregory J.

AU - Adriany, Gregor

AU - Uğurbil, Kâmil

AU - Vaughan, J. Thomas

PY - 2018/1

Y1 - 2018/1

N2 - Purpose: To validate electromagnetic and thermal simulations with in vivo temperature measurements, and to demonstrate a framework that can be used to predict temperature increase caused by radiofrequency (RF) excitation with dipole transmitter arrays. Methods: Dipole arrays were used to deliver RF energy in the back/neck region of the swine using different RF excitation patterns (n = 2–4 per swine) for heating. The temperature in anesthetized swine (n = 3) was measured using fluoroscopic probes (n = 12) and compared against thermal modeling from animal-specific electromagnetic simulations. Results: Simulated temperature curves were in agreement with the measured data. The root mean square error between simulated and measured temperature rise at all locations (at the end of each RF excitation) is calculated as 0.37°C. The mean experimental temperature rise at the maximum temperature rise locations (averaged over all experiments) is calculated as 2.89°C. The root mean square error between simulated and measured temperature at the maximum temperature rise location is calculated as 0.57°C. (Error values are averaged over all experiments.). Conclusions: Electromagnetic and thermal simulations were validated with experiments. Thermal effects of RF excitation at 10.5 Tesla with dipoles were investigated. Magn Reson Med 79:479–488, 2018.

AB - Purpose: To validate electromagnetic and thermal simulations with in vivo temperature measurements, and to demonstrate a framework that can be used to predict temperature increase caused by radiofrequency (RF) excitation with dipole transmitter arrays. Methods: Dipole arrays were used to deliver RF energy in the back/neck region of the swine using different RF excitation patterns (n = 2–4 per swine) for heating. The temperature in anesthetized swine (n = 3) was measured using fluoroscopic probes (n = 12) and compared against thermal modeling from animal-specific electromagnetic simulations. Results: Simulated temperature curves were in agreement with the measured data. The root mean square error between simulated and measured temperature rise at all locations (at the end of each RF excitation) is calculated as 0.37°C. The mean experimental temperature rise at the maximum temperature rise locations (averaged over all experiments) is calculated as 2.89°C. The root mean square error between simulated and measured temperature at the maximum temperature rise location is calculated as 0.57°C. (Error values are averaged over all experiments.). Conclusions: Electromagnetic and thermal simulations were validated with experiments. Thermal effects of RF excitation at 10.5 Tesla with dipoles were investigated. Magn Reson Med 79:479–488, 2018.

KW - 10.5 T

KW - SAR

KW - dipole arrays

KW - radiofrequency (RF)

KW - temperature

UR - http://www.scopus.com/inward/record.url?scp=85017332199&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85017332199&partnerID=8YFLogxK

U2 - 10.1002/mrm.26688

DO - 10.1002/mrm.26688

M3 - Article

C2 - 28370375

AN - SCOPUS:85017332199

VL - 79

SP - 479

EP - 488

JO - Magnetic Resonance in Medicine

JF - Magnetic Resonance in Medicine

SN - 0740-3194

IS - 1

ER -