vertical position of sidecap figure with respect to top aligned caption

EDIT: Solution revised to handle long captions. Place a vertical rule at the beginning of the caption:

\documentclass{article}
\usepackage[demo]{graphicx}

\usepackage{sidecap}
\sidecaptionvpos{figure}{t}

\begin{document}

\begin{SCfigure}
    \includegraphics{graphs/dataset17b.pdf}
    \caption{\protect\rule{0ex}{5ex}Foo bar Foo bar Foo bar Foo bar Foo bar Foo bar Foo bar }
\end{SCfigure}

\end{document}