Wedge factor constituents of high energy photon beams: field size and depth dependence.
作者： S. Heukelom , J.H. Lanson , B.J. Mijnheer
DOI: 10.1016/0167-8140(94)90011-6
关键词:
摘要: Wedge factors have been determined as a function of field size and phantom depth for 60Co gamma-ray beam X-ray beams in the range from 4 MV to 25 MV. The results show an increase wedge factor with size, up 9.1% beam. magnitude this is linear product that part irradiated volume can be observed point measurement, its mass energy-absorption coefficient density. This relationship independent photon energy, type material angle. Differences variation amount backscatter monitor open wedged yielded only minor influence, 0.7%. For 4-16 increases linearly depth, almost independently size. more complicated particular
sci-hub.se 参考文章(16)
Kiuru A, Patomäki Lk, Depth dose distributions in wedge fields of Co-60 beams. Strahlentherapie, v. 147, no. 6, pp. 611-618. ,vol. 147, pp. 611- ,(1974)
F G Abrath, J A Purdy, Wedge design and dosimetry for 25-MV x rays. Radiology. ,vol. 136, pp. 757- 762 ,(1980) , 10.1148/RADIOLOGY.136.3.6773106
B.J. Mijnheer, A.H.L. Aalbers, A.g. Visser, F.W. Wittkämper, Consistency and simplicity in the determination of absorbed dose to water in high-energy photon beams: a new code of practice. Radiotherapy and Oncology. ,vol. 7, pp. 371- 384 ,(1986) , 10.1016/S0167-8140(86)80068-8
Hideo Kubo, Telescopic measurements of backscattered radiation from secondary collimator jaws to a beam monitor chamber using a pair of slits Medical Physics. ,vol. 16, pp. 295- 298 ,(1989) , 10.1118/1.596381
Robert J. Shalek, Determination of Absorbed Dose in a Patient Irradiated by Beams of X or Gamma Rays in Radiotherapy Procedures Medical Physics. ,vol. 4, pp. 461- 461 ,(1977) , 10.1118/1.594356
L Atherton, Wedge transmission data: effect of backscatter into monitor chamber. Physics in Medicine and Biology. ,vol. 24, pp. 451- 452 ,(1979) , 10.1088/0031-9155/24/2/424
J.H. Hubbell, Photon mass attenuation and energy-absorption coefficients The International Journal of Applied Radiation and Isotopes. ,vol. 33, pp. 1269- 1290 ,(1982) , 10.1016/0020-708X(82)90248-4
Wilfred Sewchand, Faiz M. Khan, Jeffrey Williamson, Variations in Depth-Dose Data Between Open and Wedge Fields for 4-MV X-Rays Radiology. ,vol. 127, pp. 789- 792 ,(1978) , 10.1148/127.3.789
T Knoos, L Wittgren, Which depth dose data should be used for dose planning when wedge filters are used to modify the photon beam Physics in Medicine and Biology. ,vol. 36, pp. 255- 267 ,(1991) , 10.1088/0031-9155/36/2/009
Pin-Hua Huang, Lee M. Chin, Bengt E. Bjärngard, Scattered photons produced by beam-modifying filters Medical Physics. ,vol. 13, pp. 57- 63 ,(1986) , 10.1118/1.595923