AN ASSESSMENT OF THE INTRAUTERINE SOUND INTENSITY LEVEL DURING OBSTETRIC ECHO-PLANAR MAGNETIC-RESONANCE-IMAGING

被引:75
作者
GLOVER, P
HYKIN, J
GOWLAND, P
WRIGHT, J
JOHNSON, I
MANSFIELD, P
机构
[1] UNIV NOTTINGHAM,DEPT PHYS,CTR MAGNET RESONANCE,NOTTINGHAM NG7 2RD,ENGLAND
[2] CITY HOSP,DEPT OBSTET & GYNAECOL,NOTTINGHAM NG5 1PB,ENGLAND
[3] QUEENS MED CTR,DEPT SURG,NOTTINGHAM NG7 2UH,ENGLAND
关键词
D O I
10.1259/0007-1285-68-814-1090
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
In order to assess the sound level experienced by the fetal ear during obstetric magnetic resonance imaging, a fluid filled stomach was used as an experimental model of the gravid uterus. A better than 30 dB attenuation in intensity was recorded across the frequency band of interest for all patient orientations. This was enough to reduce acoustic sound pressure from a level dose to the instantaneous damage threshold (120 dB), to an acceptable level (<90 dB). Direct mechanical coupling through the patient table was also shown to increase uterine sound pressure levels by as much as 10 dB. Much higher peak pressures could be obtained by tapping of abdomen with the fingers.
引用
收藏
页码:1090 / 1094
页数:5
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