![]() ![]() ![]() The speakers were separately calibrated on an acoustic noise level of 55dB(A). Designed specifically for premature babies, Natus MiniMuffs Noise Attenuators protect their sensitive ears and provide a safe environment for healthy development. Four speakers (Yamaha MSP5A, Hamamatsu, Shizuoka, Japan) were positioned around this test setup: one on each end of the dummy bore and one on both sides (Figure 2). Natus product lines include: ALGO Newborn Hearing Screeners, MiniMuffs Neonatal Noise Attenuators, the CO-Stat End Tidal Breath Analyzer, neoBLUE LED. A microphone (Brüel & Kjær, type 4189) was placed in the isocenter of the dummy bore to record the sound volumes in dB(A). We conducted all sound level measurements using a Brüel & Kjær Sound Level Meter (type 2250, Brüel & Kjær, Nærum, Denmark). Soesterberg, the Netherlands), Natus MiniMuffs (Natus Medical Incorporated, San Carlos, CA, USA) and a hood for acoustic noise protection (19). A test setup with a dummy MR bore (old 7.0T MR bore) was made in a sound isolated booth to test the attenuation of acoustic noise with the different hoods and no hood. A prototype of the hood (190cm long) for noise protection that fits in the 7.0T MR scanner was developed using a layer of 5cm foam (EASYfoam TC2, Easy Noise Control). domain provided by at (7 Years, 184 Days ago), expired at (1 Year, 181 Days left). Preparation - Acoustic Noise protection In the 3.0T MRI, acoustic noise protection is guaranteed by Alpine Muffy Baby (Alpine Hearing Protection, Soesterberg, the Netherlands), Natus MiniMuffs (Natus Medical Incorporated, San Carlos, CA, USA) and a hood for acoustic noise protection (19), respectively leading to 6.4-31.6 dB, 7dB and 4-13.6dB reduction. On the left the adult head and torso is shown which was used as a reference. 239 7.0T MRI in neonates Figure 1: Different positions of the infant model in the RF coil. ![]()
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