title: Validation of dosimetric field matching accuracy from proton therapy using a robotic patient positioning system.
abstract: Large area, shallow fields are well suited to proton therapy. However, due to beam production limitations, such volumes typically require multiple matched fields. This is problematic due to the relatively narrow beam penumbra at shallow depths compared to electron and photon beams. Therefore, highly accurate dose planning and delivery is required. As the dose delivery includes shifting the patient for matched fields, accuracy at the 1-2 millimeter level in patient positioning is also required. This study investigates the dosimetric accuracy of such proton field matching by an innovative robotic patient positioner system (RPPS). The dosimetric comparisons were made between treatment planning system calculations, radiographic film and ionization chamber measurements. The results indicated good agreement amongst the methods and suggest that proton field matching by a RPPS is accurate and efficient.
authors.affiliation: Midwest Proton Radiotherapy Institute, 2425 Milo B. Sampson Lane, Bloomington, Indiana USA. jonathan.farr@uk-essen.de
authors.forename: Jonathan B
authors.initials: JB
authors.lastname: Farr
authors.forename: Avril
authors.initials: A
authors.lastname: O'Ryan-Blair
authors.forename: Frederick
authors.initials: F
authors.lastname: Jesseph
authors.forename: Wen-Chien
authors.initials: WC
authors.lastname: Hsi
authors.forename: Chris E
authors.initials: CE
authors.lastname: Allgower
authors.forename: Anthony E
authors.initials: AE
authors.lastname: Mascia
authors.forename: Allan F
authors.initials: AF
authors.lastname: Thornton
authors.forename: Andreas N
authors.initials: AN
authors.lastname: Schreuder
mesh_terms: D006801:Humans; D009369:Neoplasms / Q000532:radiotherapy*; D056888:Patient Positioning; D061766:Proton Therapy; D011874:Radiometry; D011878:Radiotherapy / Q000295:instrumentation*; D011879:Radiotherapy Dosage; D012371:Robotics; D011522:Protons
chemical_list: D011522:Protons