研究のタイプ: 医学/生物学の研究 (experimental study)

[ヘッドコイルを用いた高強度MR画像撮影で生じる角膜温の変化] med./bio.

Corneal temperature changes induced by high-field-strength MR imaging with a head coil.

掲載誌: Radiology 1988; 167 (3): 809-811

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研究目的(著者による)

To determine changes in corneal temperature that are associated with high-field-strength magnetic resonance imaging performed with a transmit/receive head coil at local SARs exceeding the level recommended by the FDA (U.S. Food and Drug Administration).

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 64 MHz
ばく露時間: 2 min 40 sec.
ばく露2: 64 MHz
ばく露時間: 8 min 40 sec

General information

MRI experiment.

ばく露1

主たる特性
周波数 64 MHz
ばく露時間 2 min 40 sec.
ばく露装置
ばく露の発生源/構造
  • 1.5 T superconducting magnet. MR imaging was preformed with a 28 cm open bore transmit/receive head
パラメータ
測定量 種別 Method Mass 備考
SAR 2.54 mW/g minimum 計算値 unspecified to 3.05 W/kg.
磁束密度 1.5 T - - - -

ばく露2

主たる特性
周波数 64 MHz
ばく露時間 8 min 40 sec
ばく露装置
ばく露の発生源/構造
  • 1.5 T superconducting magnet. MR imaging was preformed with a 28 cm open bore transmit/receive head
パラメータ
測定量 種別 Method Mass 備考
SAR 2.54 mW/g minimum 計算値 unspecified to 3.05 W/kg.
磁束密度 1.5 T - - - -

Reference articles

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
研究対象とした臓器系:
  • eye
調査の時期:
  • ばく露後

研究の主なアウトカム(著者による)

There was a statistically significant increase in the average corneal temperature (32.7°C +/- 0.7 before imaging, 33.2°C +/- 0.5 after). The changes in corneal temperature ranged from 0.0 °C to 1.8°C (mean, 0.5°C). The highest corneal temperature measured after imaging was 34.4°C. The authors conclude that clinical magnetic resonance imaging with use of a head coil at the SARs studied causes relatively minor increases in corneal temperature that do not seem to pose any thermal hazard to ocular tissue.

研究の種別:

研究助成