title: In-gantry or remote patient positioning? Monte Carlo simulations for proton therapy centers of different sizes.
abstract: OBJECTIVE
  We estimated the potential advantage of remote positioning (RP) vs. in-room positioning (IP) for a proton therapy facility in terms of patient throughput.
  
  
  METHODS
  Monte Carlo simulations of facilities with one, two or three gantries were performed. A sensitivity analysis was applied by varying the imaging and setup correction system (ICS), the speed of transporters (for RP) and beam switching time. Possible advantages of using three couches (for RP) or of switching the beam between fields was also investigated.
  
  
  RESULTS
  For a single gantry facility, an average of 20% more patients could be treated using RP: ranging from +45%, if a fast transporter and slow ICS were simulated, to -14% if a slow transporter and fast ICS was simulated. For two gantries, about 10% more patients could be treated with RP, ranging from +32% (fast transporter, slow ICS) to -12% (slow transporter, fast ICS). The ability to switch beam between fields did not substantially influence the throughput. In addition, the use of three transporters showed increased delays and therefore a slight reduction of the fractions executables. For three gantries, RP and IP showed similar results.
  
  
  CONCLUSIONS
  The advantage of RP vs. IP strongly depends on ICS and the speed of the transporters. For RP to be advantageous, reduced transport times are required. The advantage of RP decreases with increasing number of gantries.
authors: AtreP - Agenzia Provinciale per la Protonterapia, Trento, Italy.
authors: Giovanni
authors: G
authors: Fava
authors: Lamberto
authors: L
authors: Widesott
authors: Francesco
authors: F
authors: Fellin
authors: Maurizio
authors: M
authors: Amichetti
authors: Valentina
authors: V
authors: Viesi
authors: Antony J
authors: AJ
authors: Lomax
authors: Lydia
authors: L
authors: Lederer
authors: Eugen B
authors: EB
authors: Hug
authors: Claudio
authors: C
authors: Fiorino
authors: Giovannella
authors: G
authors: Salvadori
authors: Nadia
authors: N
authors: Di Muzio
authors: Marco
authors: M
authors: Schwarz
mesh_terms: D006801:Humans; D009010:Monte Carlo Method; D056888:Patient Positioning; D061766:Proton Therapy; D011522:Protons
chemical_list: D011522:Protons