Figure 4.
Linear regression fit of equation 19 that is [Log (ρe)-LogG(ν)] versus Zxeff 95% confidence interval was shown by lines drawn above and below the central line. (a) The value of correlation coefficient a4 and b4 were found to be −0.501 and 1.366 × 10−4, respectively (linear regression coefficient r = 0.9707 with P < 0.0001 that is statistically highly significant result) for voltage ν =140 kVp. (b) Similarly, at ν =100 kVp, a4 and b4 were found to be −0.509 and 5.932 × 10−5, respectively (linear regression coefficient r = 0.8696 with P < 0.01 that is statistically significant result)