title: Independent dose per monitor unit review of eight U.S.A. proton treatment facilities.
abstract: OBJECTIVE
  Compare the dose per monitor unit at different proton treatment facilities using three different dosimetry methods.
  
  
  METHODS
  Measurements of dose per monitor unit were performed by a single group at eight facilities using 11 test beams and up to six different clinical portal treatment sites. These measurements were compared to the facility reported dose per monitor unit values.
  
  
  RESULTS
  Agreement between the measured and reported doses was similar using any of the three dosimetry methods. Use of the ICRU 59 ND,w based method gave results approximately 3% higher than both the ICRU 59 NX and ICRU 78 (TRS-398) ND,w based methods.
  
  
  CONCLUSIONS
  Any single dosimetry method could be used for multi-institution trials with similar conformity between facilities. A multi-institutional trial could support facilities using both the ICRU 59 NX based and ICRU 78 (TRS-398) ND,w based methods but use of the ICRU 59 ND,w based method should not be allowed simultaneously with the other two until the difference is resolved.
authors.affiliation: Colton, California 92354.
authors.forename: M F
authors.initials: MF
authors.lastname: Moyers
authors.affiliation: Department of Radiation Physics, University of Texas - M. D. Anderson Cancer Center, Houston, Texas 77030.
authors.forename: G S
authors.initials: GS
authors.lastname: Ibbott
authors.affiliation: Department of Radiation Physics, University of Texas - M. D. Anderson Cancer Center, Houston, Texas 77030.
authors.forename: R L
authors.initials: RL
authors.lastname: Grant
authors.affiliation: Department of Radiation Physics, University of Texas - M. D. Anderson Cancer Center, Houston, Texas 77030.
authors.forename: P A
authors.initials: PA
authors.lastname: Summers
authors.affiliation: Department of Radiation Physics, University of Texas - M. D. Anderson Cancer Center, Houston, Texas 77030.
authors.forename: D S
authors.initials: DS
authors.lastname: Followill
mesh_terms: D061766:Proton Therapy; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation / Q000379:methods*; D011879:Radiotherapy Dosage; D014481:United States; D011522:Protons
chemical_list: D011522:Protons