Modelling lateral beam quality variations in pencil kernel based photon dose calculations

Physics in Medicine and Biology

Volumn 51, Issue 16, 2006, Pages 4111-4118

  Nyholm, T ^a   Olofsson, J ^a   Ahnesjo A ^a,b,c   Karlsson, M ^a  

^a UMEÅ UNIVERSITY   (Sweden)

^b Elekta AB   (Sweden)

^c UPPSALA UNIVERSITY   (Sweden)

Author keywords

[No Author keywords available]

Indexed keywords

DATA ACQUISITION; DOSIMETRY; FILTRATION; IMAGE QUALITY; PATIENT MONITORING; PHOTONS; RADIATION EFFECTS;

HALF VALUE LAYER (HVL); MACHINE PERFORMANCE; PENCIL KERNEL; STANDARD TREATMENT MACHINES;

RADIOTHERAPY;

ACCURACY; ARTICLE; DOSIMETRY; MATHEMATICAL COMPUTING; MODEL; PHOTON THERAPY; PRIORITY JOURNAL; RADIATION FIELD; TECHNIQUE; THICKNESS;

EID: 33746837724     PISSN: 00319155     EISSN: 13616560     Source Type: Journal    
DOI: 10.1088/0031-9155/51/16/016     Document Type: Article

References (25)

1. Ahnesjö A, Saxner M and Trepp A 1992 A pencil beam model for photon dose calculation Med. Phys. 19 263-73
2. Ahnesjö A and Trepp A 1991 Acquisition of the effective lateral energy fluence distribution for photon beam dose calculations by convolution models Phys. Med. Biol. 36 973-86
3. Ahnesjö A, Weber L, Murman A, Saxner M, Thorslund I and Traneus E 2005 Beam modeling and verification of a photon beam multisource model Med. Phys. 32 1722-37
4. Bjärngard B E and Petti P L 1988 Description of the scatter component in photon-beam data Phys. Med. Biol. 33 21-32
5. Bjärngard B E, Rashid H and Obcemea C H 1989 Separation of primary and scatter components of measured photon beam data Phys. Med. Biol. 34 1939-45
6. Hanson W F, Berkley L W and Peterson M 1980a Off-axis beam quality change in linear accelerator x-ray beams Med. Phys. 7 145-6
7. Hanson W F, Berkley L W and Peterson M 1980b Calculative technique to correct for the change in linear accelerator beam energy at off-axis points Med. Phys. 7 147-50
8. Johansson B, Wickman G and Bahar-Gogani J 1997 General collection efficiency for liquid isooctane and tetramethylsilane in pulsed radiation Phys. Med. Biol. 42 1929-38
9. Karlsson M, Nystrom H and Svensson H 1993 Photon beam characteristics on the MM50 racetrack microtron and a new approach for beam quality determination Med. Phys. 20 143-9
10. Lee P C 1997 Monte Carlo simulations of the differential beam hardening effect of a flattening filter on a therapeutic x-ray beam Med. Phys. 24 1485-9
11. Li X A, Soubra M, Szanto J and Gerig L H 1995 Lateral electron equilibrium and electron contamination in measurements of head-scatter factors using miniphantoms and brass caps Med. Phys. 22 1167-70
12. Mohan R, Chui C and Lidofsky L 1985 Energy and angular distributions of photons from medical linear accelerators Med. Phys. 12 592-7
13. 60Co and other high-energy photon beams in water Med. Phys. 20 1353-60
14. Nizin P S 1991 Geometrical aspects of scatter-to-primary ratio and primary dose Med. Phys. 18 153-60
15. Nyholm T, Olofsson J, Ahnesjo A and Karlsson M 2006 Photon pencil kernel parameterisation based on beam quality index Radiother. Oncol. 78 347-51
16. Nyström H and Karlsson M 1994 Photon beam quality specification by narrow-beam transmission measurements Phys. Med. Biol. 39 1231-45
17. Piermattei A, Arcovito G, Azario L, Bacci C, Bianciardi L, De Sapio E and Giacco C 1990 A study of quality of bremsstrahlung spectra reconstructed from transmission measurements Med. Phys. 17 227-33
18. Robar J L, Riccio S A and Martin M A 2002 Tumour dose enhancement using modified megavoltage photon beams and contrast media Phys. Med. Biol. 47 2433-49
19. Sätherberg A 1997 Characterisation of high energy bremstrahlung beams Radiation Physics Umeå University
20. Sätherberg A, Karlsson M and Karlsson M 1996 Theoretical and experimental determination of phantom scatter factors for photon fields with different radial energy variation Phys. Med. Biol. 41 2687-94
21. Tailor R C, Tello V M, Schroy C B, Vossler M and Hanson W F 1998 A generic off-axis energy correction for linac photon beam dosimetry Med. Phys. 25 662-7
22. Wickman G, Johansson B, Bahar-Gogani J, Holmström T and Grindborg J E 1998 Liquid ionization chambers for absorbed dose measurements in water at low dose rates and intermediate photon energies Med. Phys. 25 900-7
23. Wickman G and Nyström H 1992 The use of liquid ionization chambers for high precision radiotherapy dosimetry Phys. Med. Biol. 42 1789-812
24. Yu M K, Sloboda R S and Murray B 1997 Linear accelerator photon beam quality at off-axis points Med. Phys. 24 233-9
25. Zefkili S, Kappas C and Rosenwald J C 1994 On-axis and off-axis primary dose component in high energy photon beams Med. Phys. 21 799-808