title: [Investigation for decrease of delivery time for the prostate cancer patient by modifications of treatment planning parameters in TomoTherapy planning station].
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.
authors.affiliation: Department of Therapeutic Radiation Oncology, Aichi Cancer Center Hospital.
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Shimizu
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Tachibana
authors.forename: Takashi
authors.initials: T
authors.lastname: Kubota
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Imamura
authors.forename: Shigeru
authors.initials: S
authors.lastname: Matsushima
authors.forename: Manabu
authors.initials: M
authors.lastname: Yoshimoto
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kodaira
mesh_terms: D000015:Abnormalities, Multiple; D004423:Ear / Q000002:abnormalities; D006330:Heart Defects, Congenital; D006801:Humans; D017880:Limb Deformities, Congenital; D008297:Male; D011471:Prostatic Neoplasms / Q000532:radiotherapy*; D011625:Pterygium; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation / Q000379:methods*; D050397:Radiotherapy, Intensity-Modulated / Q000295:instrumentation*; D011884:Radius / Q000002:abnormalities; D013131:Spine / Q000002:abnormalities; D013997:Time Factors; D014714:Vertebrates / Q000002:abnormalities