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Titolo:
Calculations of B-1 distribution, SNR, and SAR for a surface coil adjacentto an anatomically-accurate human body model
Autore:
Collins, CM; Smith, MB;
Indirizzi:
Penn State Univ, Coll Med, Dept Radiol H066, Ctr NMR Res, Hershey, PA 17033 USA Penn State Univ Hershey PA USA 17033 , Ctr NMR Res, Hershey, PA 17033 USA Penn State Univ, Coll Med, Dept Physiol, Hershey, PA 17033 USA Penn State Univ Hershey PA USA 17033 Dept Physiol, Hershey, PA 17033 USA Univ Penn, Dept Bioengn, Philadelphia, PA USA Univ Penn Philadelphia PA USA v Penn, Dept Bioengn, Philadelphia, PA USA
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 4, volume: 45, anno: 2001,
pagine: 692 - 699
SICI:
0740-3194(200104)45:4<692:COBDSA>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIGNAL-TO-NOISE; ELECTROMAGNETIC-FIELDS; NMR; RATIO; SAMPLES; MRI;
Keywords:
calculations; SNR; power; MRI; high field;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Smith, MB Penn State Univ, Coll Med, Dept Radiol H066, Ctr NMR Res, NMR-MRI Bldg,500Univ Dr, Hershey, PA 17033 USA Penn State Univ NMR-MRI Bldg,500 Univ Dr Hershey PA USA 17033 SA
Citazione:
C.M. Collins e M.B. Smith, "Calculations of B-1 distribution, SNR, and SAR for a surface coil adjacentto an anatomically-accurate human body model", MAGN RES M, 45(4), 2001, pp. 692-699

Abstract

Calculations of the radiofrequency magnetic (B-1) field, SAR, and SNR as functions of frequency between 64 and 345 MHz for a surface coil against an anatomically-accurate human chest are presented. Calculated B-1 field distributions are in good agreement with previously-published experimental results up to 175 MHz, especially considering the dependence of field behavior on subject anatomy. Calculated SNR in the heart agrees well with theory for low frequencies (nearly linear increase with B-0 field strength). Above 175MHz, the trend in SNR with frequency begins to depend largely on location in the heart. At all frequencies, present limits on local (1 g) SAR levels are exceeded before limits on whole-body average limits. At frequencies above 175 MHz, limits on SAR begin to be an issue in some common imaging sequences. These results are relevant for coils and subjects similar to those modeled here. Magn Reson Med 45:692-699, 2001. (C) 2001 Wiley-Liss, Inc.

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Documento generato il 03/04/20 alle ore 11:12:48