[Influence of position of ionization chamber and leaf-end on verification value in IMRT verification for prostate cancer]. - Hashimoto H; Nagano H; Katou M; Nakanishi M; Watanabe M; Shimo T; Ichinose T; Agawa M; Tashima Y (Nihon Hoshasen Gijutsu Gakkai zasshi, 2009)