A 10 MV x-ray attenuation coefficient expression for water as a function of depth and off-axis distance

Journal of JASTRO

Volumn 10, Issue 1, 1998, Pages 53-60

  Iwasaki, Akira ^a  

^a HIROSAKI UNIVERSITY   (Japan)

Author keywords

10 MV x rays; Attenuation coefficient; Depth quality change; Off axis quality change

Indexed keywords

EID: 0002266831     PISSN: 10409564     EISSN: 18819885     Source Type: Journal    
DOI: 10.11182/jastro1989.10.53     Document Type: Article

References (20)

1. Nyström, H. and Karlsson, M.: Photon beam quality specification by narrow-beam transmission measurements. Phys. Med. Biol. 39: 1231–1245, 1994.
2. Hanson, W. F., Berkley, L.W., and Peterson, M.: Off-axis beam quality change in linear accelerator x-ray beams. Med. Phys. 7: 145–146, 1980.
3. Hanson, W. F., Berkley, L.W., and Peterson, M.: Calculative technique to correct for the change in linear accelerator beam energy at off-axis points. Med. Phys. 7: 147–150, 1980.
4. Lutz, W. R. and Larsen, R.D.: The effect of flattening filter design on quality variations within an 8-MV primary x-ray beam. Med. Phys. 11: 843–845, 1984.
5. Kepta, A. G., Johnson, P.M., and David, J.: The effect of off-axis quality changes on zero area TAR for megavoltage beams. Phys. Med. Biol. 30: 589–595, 1985.
6. Mohan, R. Chui, C., and Lidofsky, L.: Energy and angular distributions of photons from medical linear accelerators. Med. Phys. 12: 592–597, 1985.
7. Khan, F. M., Gerbi, B. J., and Deibel, F.C.: Dosimetry of asymmetric x-ray collimators. Med. Phys. 13: 936–941, 1986.
8. Loshek, D. D.: Analysis of tissue-maximum ratio/scatter-maximum ratio model relative to the prediction of tissue-maximum ratio in asymmetrically collimated fields. Med. Phys. 15: 672–682, 1988.
9. Zefkili, S., Kappas, C., and Rosenwald, J.C.: On-axis and off-axis primary dose component in high energy photon beams. Med. Phys. 21: 799–808, 1994.
10. Bjärngard, B. E. and Shackford, H.: Attenuation in high-energy x-ray beams. Med. Phys. 21: 1069–1073, 1994.
11. Iwasaki, A.: A convolution method for calculating 10-MV x-ray primary and scatter dose including electron contamination dose. Med. Phys. 19: 907–915, 1992.
12. Attix, F. H.: The partition of kerma to account for bremsstrahlung. Health Phys. 36: 347–354, 1979.
13. Attix, F. H.: Addendum to ‘The partition of kerma to account for bremsstrahlung’. Health Phys. 36: 536, 1979.
14. Attix, F. H.: Energy imparted, energy transferred and net energy transferred. Phys. Med. Biol. 28: 1385–1390, 1983.
15. Metcalfe, P. E., Hoban, P. W., Murray, D. C., and Round, W.H.: Beam hardening of 10 MV radiotherapy x-rays: Analysis using a convolution/superposition method. Phys. Med. Biol. 35: 1533–1549, 1990.
16. Iwasaki, A.: Theoretical considerations of using in-air chamber readings for evaluation of the attenuation of in-phantom primary water collision kerma. J. Jpn. Soc. Ther. Radiol. Oncol. 10: 47–52, 1998.
17. Hubbell, J. H.: Photon mass attenuation and energy-absorption coefficients from 1 keV to 20 MeV. Int. J. Appl. Radiat. Isotopes 33: 1269–1290, 1982.
18. Johns, H. E. and Cunningham, J.R.: The Physics of Radiology, 4th ed., Thomas, Springfield, IL, 1983, pp. 719–739.
19. Ahnesjö, A.: Collapsed cone convolution of radiant energy for photon dose calculation in heterogeneous media. Med. Phys. 16: 577–592, 1989.
20. Meli, J. A. and Nath, R.: Choice of material for HVL measurements in megavoltage x-ray beams. Med. Phys. 12: 108–110, 1985.