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Investigation for decrease of delivery time for the prostate cancer patient by modifications of treatment planning parameters in TomoTherapy planning station
Authors:Shimizu Hidetoshi  Tachibana Hiroyuki  Kubota Takashi  Imamura Hiroshi  Matsushima Shigeru  Yoshimoto Manabu  Kodaira Takeshi
Affiliation:Department of Therapeutic Radiation Oncology, Aichi Cancer Center Hospital.
Abstract:The purpose of present study is to investigate the decrease of delivery time for prostate cancer patient by using the helical type accelerator, Hi-Art System. The delivery time for Hi-Art System depends on planning parameters [pitch, modulation factor (MF) and field width (FW)], which are set by the operator at the beginning of the treatment planning. If you can allow for the deterioration of the dose distribution, the delivery time is able to decrease by increasing of FW and/or by decreasing of MF. On the other hands, as the use of 5.0 cm FW tends to increase the dose for the penile bulb, enough consideration for the dose distribution is needed. In addition, pitch should be set for the gantry rotation period not to become 15 s or less to prevent the increase of delivery time.
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