% \begin{table*}[b]
%     \centering
%     \caption{Registration performance on typical cases using the fixed image (left) and GT (right) for evaluation. \textbf{Best} and \underline{second best}  are highlighted. LOTUS outpainting significantly boosts performance (*, paired t-tests, p\textless 0.05) compared to baselines.}
%     \begin{minipage}{0.45\textwidth} % Reduce width to avoid overlap
%         \centering
%         \setlength{\tabcolsep}{2pt} % Reduce column spacing
%         \renewcommand{\arraystretch}{1} % Adjust row height
%         % \caption*{(a) Using Fixed Image for Evaluation}
%         \resizebox{\textwidth}{!}{ % Automatically scale down
%         \begin{tabular}{l|cc|c}
%         \hline
%             \multirow{2}{*}{Method} & \multicolumn{2}{c|}{Similarity Metrics} & \multicolumn{1}{c}{Overlap Area} \\ 
%             \cline{2-4}
%             ~ & NCC ↑ & MSE($\times 10$)↓ & DSC \\ \hline
%             MOV & 0.552$\pm$0.128 & 0.325$\pm$0.113 & 0.975$\pm$0.050  \\ 
%             GT & 0.892$\pm$0.033 & 0.127$\pm$0.034 & 0.855$\pm$0.030  \\ \hline
%             Greedy & 0.702$\pm$0.214 & 0.240$\pm$0.136 & 0.858$\pm$0.204  \\ 
%             ANTs & 0.698$\pm$0.157 & 0.237$\pm$0.102 & 0.906$\pm$0.052  \\ 
%             \hline
%             LOTUS+G & \underline{0.810$\pm$0.213} & \underline{0.138$\pm$0.066*} & 0.794$\pm$0.186 \\ 
%             LOTUS+A & \textbf{0.891$\pm$0.053*} & \textbf{0.122$\pm$0.035*} & 0.843$\pm$0.033  \\ 
%             \hline
%         \end{tabular}}
%     \end{minipage}
%     \hspace{0.05\textwidth} % Add spacing between tables
%     \begin{minipage}{0.45\textwidth} % Reduce width
%         \centering
%         \setlength{\tabcolsep}{2pt} % Reduce spacing
%         \renewcommand{\arraystretch}{1}
%         % \caption*{(b) Using GT for Evaluation}
%         \resizebox{\textwidth}{!}{ % Automatically adjust size
%         \begin{tabular}{l|cc|c}
%         \hline
%             \multirow{2}{*}{Method} & \multicolumn{2}{c|}{Similarity Metrics} & \multicolumn{1}{c}{Transf Error} \\ 
%             \cline{2-4}
%             ~ & NCC ↑ & MSE($\times 100$) ↓ & ER ↓ \\ \hline
%             Greedy & 0.839$\pm$0.219 & 1.44$\pm$1.42 & 43.4$\pm$34.8  \\ 
%             ANTs & 0.851$\pm$0.113 & 1.49$\pm$0.95 & 55.1$\pm$33.8  \\ 
%             \hline
%             LOTUS+G & \underline{0.887$\pm$0.298} & \underline{0.928$\pm$1.858} & \underline{17.3$\pm$26.8*} \\ 
%             LOTUS+A & \textbf{0.985$\pm$0.023*} & \textbf{0.255$\pm$0.210*} & \textbf{8.04$\pm$17.67*}  \\ \hline
%         \end{tabular}}
%     \end{minipage}
%     \label{tab:combined_registration}
% \end{table*}

\begin{table*}[b]
    \centering
    \caption{Registration performance on typical cases using the fixed image (left) and GT (right) for evaluation. \textbf{Best} and \underline{second best} are highlighted. LOTUS outpainting significantly boosts performance (*, paired t-tests, p\textless 0.05) compared to baselines.}
    \begin{minipage}{0.38\textwidth} % Reduce width to avoid overlap
        \centering
        \setlength{\tabcolsep}{1pt} % Reduce column spacing
        \renewcommand{\arraystretch}{1} % Adjust row height
        % \caption*{(a) Using Fixed Image for Evaluation}
        \resizebox{\textwidth}{!}{ % Automatically scale down
        \begin{tabular}{l|cc}
        \hline
            \multirow{2}{*}{Method} & \multicolumn{2}{c}{Similarity Metrics} \\ 
            \cline{2-3}
            ~ & NCC ↑ & MSE($\times 10$)↓ \\ \hline
            MOV & 0.552$\pm$0.128 & 0.325$\pm$0.113  \\ 
            GT & 0.892$\pm$0.033 & 0.127$\pm$0.034  \\ \hline
            Greedy & 0.702$\pm$0.214 & 0.240$\pm$0.136  \\ 
            ANTs & 0.698$\pm$0.157 & 0.237$\pm$0.102  \\ 
            \hline
            LOTUS+Greedy & \underline{0.810$\pm$0.213} & \underline{0.138$\pm$0.066*}  \\ 
            LOTUS+ANTs & \textbf{0.891$\pm$0.053*} & \textbf{0.122$\pm$0.035*}  \\ 
            \hline
        \end{tabular}}
    \end{minipage}
    \hspace{0.05\textwidth} % Add spacing between tables
    \begin{minipage}{0.52\textwidth} % Reduce width
        \centering
        \setlength{\tabcolsep}{1pt} % Reduce spacing
        \renewcommand{\arraystretch}{1}
        % \caption*{(b) Using GT for Evaluation}
        \resizebox{\textwidth}{!}{ % Automatically adjust size
        \begin{tabular}{l|cc|c}
        \hline
            \multirow{2}{*}{Method} & \multicolumn{2}{c|}{Similarity Metrics} & \multicolumn{1}{c}{Transformation Error} \\ 
            \cline{2-4}
            ~ & NCC ↑ & MSE($\times 100$) ↓ & RE ↓ \\ \hline
            Greedy & 0.839$\pm$0.219 & 1.44$\pm$1.42 & 43.4$\pm$34.8  \\ 
            ANTs & 0.851$\pm$0.113 & 1.49$\pm$0.95 & 55.1$\pm$33.8  \\ 
            \hline
            LOTUS+Greedy & \underline{0.887$\pm$0.298} & \underline{0.928$\pm$1.858} & \underline{17.3$\pm$26.8*} \\ 
            LOTUS+ANTs & \textbf{0.985$\pm$0.023*} & \textbf{0.255$\pm$0.210*} & \textbf{8.04$\pm$17.67*}  \\ \hline
        \end{tabular}}
    \end{minipage}
    \label{tab:combined_registration}
\end{table*}
