“…Many treatment planning articles discuss the relative merits of various aspects of treatment planning tasks, such as how to optimize dose distributions (e.g., Anderson, 1985;Hilaris, Nori, and Anderson, 1987b;Ling et al, 1988;Niroomand-Rad, Thomadsen, and Vainio, 1987;Purdy, 1984;Suit and du Bois, 1991). One issue that underlies much of the treatment planning literature is the extent to which the target volume is actually irradiated (e.g., Dutreix, 1988;Krishnan et al, 1990;Meertens, 1989;Meigooni, Meli, and Nath, 1988;Paul, Koch, and Philip, 1988;Siwek, O'Brien, and Leung, 1991;Spearman, 1988). This concern encompasses all treatment planning tasks, but focuses especially on target volume localization, simulation with dummy sources, and dosimetry.…”