## 3 Results and Discussion
(**b**) Statistical analysis bar chart of linear birefringence orientation MMPD parameter \(\theta_{e}\) and MMT parameter \(\phi_{2434}\) for each kind of bulk tissue samples. (**c**) Variance of linear birefringence orientation MMPD parameters \(\theta_{e}\) plotted against its counterpart MMT parameter \(\phi_{2434}\) for correlation analysis with all five kinds of bulk tissue samples. (**d**) Statistical analysis bar chart of linear birefringence orientation MMPD parameter \(\theta_{e}\) and MMT parameter \(\phi_{243}\) for each kind of bulk tissue samples. (**e**) Variance of linear birefringence orientation MMPD parameter \(\theta_{e}\) plotted against its counterpart MMT parameter \(\phi_{qr}\) for correlation analysis with all five kinds of bulk tissue samples. (**f**) Statistical analysis bar chart of linear birefringence orientation MMPD parameter \(\theta_{e}\) and MMT parameter \(\phi_{qr}\) for each kind of bulk tissue sample. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Type**} & \multirow{2}{*}{**Tissues**} & \multicolumn{4}{c}{**Depolarization**} \\ \cline{3-6}  & & \multicolumn{2}{c}{\(\boldsymbol{R^{2}}\)} & \multicolumn{2}{c}{\(\boldsymbol{p}\)} \\ \cline{3-6}  & & \(\boldsymbol{\Delta{-}1-b}\) & \(\boldsymbol{\Delta{-}1-b_{m}}\) & \(\boldsymbol{\Delta{-}1-b}\) & \(\boldsymbol{\Delta{-}1-b_{m}}\) \\ \hline \multirow{5}{*}{Forward} & colorectal & 0.53 & 0.50 & \textless{}0.01 & \textless{}0.01 \\  & ITB & 0.23 & 0.26 & \textless{}0.01 & \textless{}0.01 \\  & liver & 0.73 & 0.70 & \textless{}0.01 & \textless{}0.01 \\  & CD & 0.09 & 0.05 & \textgreater{}0.05 & \textless{}0.01 \\  & bladder & 0.43 & 0.44 & \textless{}0.01 & \textless{}0.05 \\  & breast & 0.49 & 0.70 & \textgreater{}0.05 & \textless{}0.01 \\  & adenoma & 0.17 & 0.11 & \textless{}0.01 & \textless{}0.05 \\  & Total & 0.49 & 0.49 & \textless{}0.01 & \textless{}0.01 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Correlation and statistical analysis comparison results between forward measured MMT and MMPD depolarization parameters for each kind of thin tissue samples. Figure 7: Comparison of MMT and MMPD depolarization parameters of thin tissue samples. **(a)** Depolarization MMPD parameter \(\Delta\) plotted against its counterpart MMT parameter \(1-b\) for correlation analysis with all seven kinds of thin tissue samples. **(b)** Statistical analysis bar chart of depolarization MMPD parameter \(\Delta\) and MMT parameter \(1-b\) for each kind of thin tissue samples. **(c)** Depolarization MMPD parameter \(\Delta\) plotted against its counterpart MMT parameter \(1-b_{m}\) for correlation analysis with all seven kinds of thin tissue samples. **(d)** Statistical analysis bar chart of depolarization MMPD parameter \(\Delta\) and MMT parameter \(1-b_{m}\) for each kind of thin tissue sample. For the correlation analysis, the values of parameters groups of (\(\Delta\), \(1-b\)) and (\(\Delta,1-b_{m}\)) are close and much smaller than \(1\) for most of the tissue samples indicated in Table 8, which means both groups of parameters hardly exist in a linear relationship. More intuitive comparisons illustrated in Figure 7a,c confirm that all the sample data points distribute randomly. For the statistical analysis, most of the samples show statistically significant differences with \(p\) < 0.01 for the parameters groups (\(\Delta,1-b\)) and (\(\Delta,1-b_{m}\)) shown in Table 8. From Figure 7b,d, we can find that the MMPD and MMT depolarization parameters values of thin tissue samples are smaller than 0.02. This is the reason why the parameters (\(\Delta,1-b\)) and (\(\Delta,1-b_{m}\)) show no significant difference in correlation analysis for the thin tissue samples with a limited thickness. Quantitative Comparison of Linear Birefringence Orientation Related MMPD and MMT Parameters for Backscattering Imaging of Bulk Tissue Samples  
For the bulk tissue samples, both the MMT parameters \(1-b\) and \(1-b_{m}\) show a good accordance with the MMPD parameter \(\Delta\).