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Attenuation coefficient estimates of mouse and rat chest wall

机译:小鼠和大鼠胸壁的衰减系数估计

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Attenuation coefficients of intercostal tissues were estimated from chest walls removed postmortem (pm) from 41 6-to-7-week-old female ICR mice and 27 10-to-11-week-old female Sprague-Dawley rats. These values were determined from measurements through the intercostal tissues, from the surface of the skin to the parietal pleura. Mouse chest walls were sealed in plastic wrap and stored at 4/spl deg/C until evaluated, and rat chest walls were sealed in sandwich bags and stored at -15/spl deg/C. When evaluated, chest wall storage time ranged between 1 and 2 days pm for mice and between 41 and 110 days pm for rats. All chest walls were allowed to equilibrate to 22/spl deg/C in a water bath prior to evaluation. For both mouse and rat intercostal tissues, the estimated frequency normalized attenuation coefficient was 1.1 dB/cm-MHz. In order to determine if there was an effect of storage time on estimates of attenuation coefficient, an independent experiment was conducted. The intercostal tissues from six mouse chest walls were evaluated at three time points (1, 22, and 144 days pm), and from six rat chest walls were evaluated at four time points (1, 22, 50, and 125 days pm). There was no difference in the estimated intercostal tissue attenuation coefficient as a function of time postmortem.
机译:从41只6至7周龄雌性ICR小鼠和27只10至11周龄雌性Sprague-Dawley大鼠的死后去除的胸壁(pm)估计肋间组织的衰减系数。这些值是从肋间组织的测量结果确定的,从皮肤表面到壁层胸膜。将小鼠胸壁密封在保鲜膜中,并以4 / spl deg / C储存直至评估;将大鼠胸壁密封在三明治袋中,并以-15 / spl deg / C储存。当进行评估时,小鼠的胸壁存储时间在下午1至2天之间,而大鼠的胸壁存储时间则在41至110天之间。在评估之前,在水浴中使所有胸壁平衡至22 / spl℃/℃。对于小鼠和大鼠肋间组织,估计的频率归一化衰减系数为1.1 dB / cm-MHz。为了确定存储时间是否对衰减系数的估计有影响,进行了独立实验。在三个时间点(下午1、22和144天)评估六个小鼠胸壁的肋间组织,在四个时间点(下午1、22、50和125天)评估六个大鼠胸壁的肋间组织。估计的肋间组织衰减系数与死后时间的函数没有差异。

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