[身体コイルと表面コイルの結合による人体組織での無線周波電力吸収の上昇] tech./dosim.

Increased radio-frequency power absorption in human tissue due to coupling between body coil and surface coil

著者: Boesiger P, Buchli R, Saner M, Meier D
掲載誌: Ann N Y Acad Sci 1992; 649: 160-165
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ばく露

ばく露 パラメータ
ばく露1: 64 MHz
Modulation type: pulsed
ばく露時間: 15 min
  • 磁束密度: 11.7 µT (from the transmitting radio-frequency)
  • 磁束密度: 12 µT (without surface coil)
  • 磁束密度: 14 µT (without surface coil)
  • 磁束密度: 112 µT (with surface coil with mechanical tuning capacitors)
  • 磁束密度: 94 µT (with surface coil with mechanical tuning capacitors)
  • 磁束密度: 6 µT (with surface coil with variocaps)
  • SAR: 0.3 W/kg (from transmitting B-field)
  • SAR: 24 W/kg (from induced B-field)

ばく露1

主たる特性
周波数 64 MHz
タイプ
  • electromagnetic field
ばく露時間 15 min
Modulation
Modulation type pulsed
Duty cycle 2.6 %
Additional information

repetition time 500 ms echo time (6 echos): 50-300 ms
ばく露装置
ばく露の発生源／構造
  • 1.5 T whole body imager
ばく露装置の詳細 coil placed concentrically on the face of the phantom (2 cm high, r = 6 cm) in such a way that coil center and phantom center coincide
パラメータ
測定量 値 種別 Method Mass 備考
磁束密度 11.7 µT - 測定値 - from the transmitting radio-frequency
磁束密度 12 µT - 計算値 - without surface coil
磁束密度 14 µT - 測定値 - without surface coil
磁束密度 112 µT - 計算値 - with surface coil with mechanical tuning capacitors
磁束密度 94 µT - 測定値 - with surface coil with mechanical tuning capacitors
磁束密度 6 µT - 測定値 - with surface coil with variocaps
SAR 0.3 W/kg - 計算値 - from transmitting B-field
SAR 24 W/kg - 計算値 - from induced B-field