Most of the prior investigations examining the effect of US on neuronal activity also used high-frequency US (>1 MHz; for exceptions see [3], [20], [21]), which has larger attenuation coefficients compared to lower frequency ultrasound.
We conducted XCT scanning of carbon fiber reinforced plastics (CFRPs) containing Ni-plated CF. The fiber orientation can be clearly observed in CT images due to a large X-ray attenuation coefficient of Ni-plating.
The ultrasonic attenuation measurements were prone to similar large variations since the attenuation coefficient is inversely proportional to the thickness.
The largest NRMSDs caused by combined rotation, shifts and attenuation coefficient errors were 6.3%, 3.0%, 2.5% and 2.3% for 125I, 201Tl, 99mTc and 111In, respectively.
It is noteworthy that the frequency range and attenuation coefficient of the locally resonant gap become larger in complex band structures if larger resonators were used.
It is evident that small differences in HU calibration and/or the difference between the HU conversion laws used can lead to large differences in the measured value of the very low air linear attenuation coefficient.
Specifically, the attenuation coefficient is a promising measure that is sensitive to PD; however, larger longitudinal studies are needed to assess its ability to monitor disease progression, determine intervention efficacy, and inform clinical management [ 5, 34, 35].
The ability to attenuate accelerations through the upper body was quantified using the attenuation coefficient.
The corresponding total attenuation coefficient shown by en2 in Fig. 9(f) was 3.2 dB/mm, which is larger than the total attenuation coefficient of the dentine layer.
From the attenuation coefficient α shown in Table 2, the resistive loss in the 150 MHz case is larger than that in the 13.56 MHz case.
