The shift in average attenuation values may propagate through CT-AC and cause local artifacts that may be incorrectly interpreted in the clinical reading.
There was no significant difference between average attenuation values between naïve joints and μ-dHACM-treated MMT joints, suggesting the treatment maintained PG content comparable to intact joints.
Second, the mean CT values we measured were the average attenuation values on the transverse slices that showed the maximum diameter of the nodule, not the density of the entire nodule.
The signal-to-noise ratio (SNR) was calculated as the mean attenuation value of the ROI/standard deviation of the surrounding oil attenuation value.
Mean attenuation values were taken as an average of the mean Hounsfield numbers over these same areas of subcutaneous fat.
Table 1 shows the average quantitative values for the image noise, mean attenuation values and contrast-to-noise ratio of three different reconstruction algorithms.
Previously, material information was captured as energy-dependent mean attenuation values.
They also provide computer-derived measures such as mean lung attenuation (MLA) (representing the average global attenuation value of the pulmonary parenchyma), skewness (representing the extent of asymmetry of histograms), and kurtosis (representing the degree of "peakedness" of the histograms) [ 15].
Average summed attenuation values for standard, TBW, calculated LBW, and measured LBW protocols were 419 HU +/- 50 (standard deviation), 443 HU +/- 51, 433 HU +/- 50, and 426 HU +/- 33, respectively (P = not significant for all).
The difference in attenuation between each tumor and surrounding parenchyma was calculated as follow: Attenuation difference = mean tumor attenuation values - mean pancreas upstream and/or downstream attenuation values.
