Characterizing the influence of detector density on dosimeter response in non-equilibrium small photon fields

Physics in Medicine and Biology

Volumn 57, Issue 14, 2012, Pages 4461-4476

  Scott, Alison J D ^a,b   Kumar, Sudhir ^a,b,c,d   Nahum, Alan E ^a,b   Fenwick, John D ^a,b,e  

^a CLATTERBRIDGE CENTRE FOR ONCOLOGY   (United Kingdom)

^b UNIVERSITY OF LIVERPOOL   (United Kingdom)

^c BHABHA ATOMIC RESEARCH CENTRE   (India)

^d HOMI BHABHA NATIONAL INSTITUTE   (India)

^e UNIVERSITY OF OXFORD   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

ACTIVE VOLUMES; ATOMIC COMPOSITIONS; ATOMIC NUMBERS; DETECTOR MATERIALS; DOSIMETRIC RESPONSE; FIELD SIZE; INTEGRAL DOSE; MONTE CARLO; NON EQUILIBRIUM; PHOTON FIELDS; PHOTON RADIATION; SMALL FIELD SIZE; SOLID STATE DETECTORS; WATER PHANTOM;

ATOMS; DOSIMETERS; DOSIMETRY; FLUORINE; PHOTONS;

DETECTORS;

DIAMOND; SILICON; WATER;

ARTICLE; METHODOLOGY; PHOTON; RADIOMETRY;

DIAMOND; PHOTONS; RADIOMETRY; SILICON; WATER;

EID: 84863524239     PISSN: 00319155     EISSN: 13616560     Source Type: Journal    
DOI: 10.1088/0031-9155/57/14/4461     Document Type: Article

References (21)

1. Alfonso R et al 2008 A new formalism for reference dosimetry of small and nonstandard fields Med. Phys. 35 5179-86
2. Beddar A S, Mason D J and O'Brien P F 1994 Absorbed dose perturbation caused by diodes for small field photon dosimetry Med. Phys. 21 1075-9
3. Bouchard H, Seuntjens J, Carrier J F and Kawrakow I 2009 Ionization chamber gradient effects in nonstandard beam configurations Med. Phys. 36 4654-63
4. Crop F, Reynaert N, Pittomvils G, Paelinck L, Wagter C D, Vakaet L and Thierens H 2009 The influence of small field sizes, penumbra, spot size and measurement depth on perturbation factors for microionization chambers Phys. Med. Biol. 54 2951-69
5. Dawson D J, Schroeder N J and Hoya J D 1986 Penumbral measurements in water for high-energy x rays Med. Phys. 13 101-4
6. Eklund K and Ahnesjö A 2010 Spectral perturbations from silicon diode detector encapsulation and shielding in photon fields Med. Phys. 37 6055-60
7. Q(clin), Q(msr) for several small detectors and for two linear accelerators using Monte Carlo simulations Med. Phys. 38 6513-26
8. Haryanto F, Fippel M, Laub W, Dohm O and Nüsslin F 2002 Investigation of photon beam output factors for conformal radiation therapy Monte Carlo simulations and measurements Phys. Med. Biol. 47 N133-43
9. Q factors in megavoltage photon beams Med. Phys. 37 2179-93
10. McKerracher C and Thwaites D I 1999 Assessment of new small-field detectors against standard-field detectors for practical stereotactic beam data acquisition Phys. Med. Biol. 44 2143-60
11. McKerracher C and Thwaites D I 2002 Verification of the dose to the isocentre in stereotactic plans Radiother. Oncol. 64 97-107
12. Mobit P N, Nahum A E and Mayles P 1997 A Monte Carlo study of the quality dependence of diamond thermoluminescent dosimeters in radiotherapy beams Phys. Med. Biol. 42 1913-27
13. Nahum A E 2009 Cavity theory, stopping-power ratios, correction factors AAPM 2009 Summer School Proc., Clinical Dosimetry Measurements in Radiotherapy ed D W O Rogers and J E Cygler (Madison, WI: Medical Physics Publishing) pp 91-136
14. Nelson W R, Hirayama H and Rogers D W O 1985 The EGS4 code system SLAC Report 265 Stanford Linear Accelerator Institute (available at http://www.slac.stanford.edu/pubs/slacreports/slac-r-265.html)
15. Pappas E, Maris T G, Zacharopoulou F, Papadakis A, Manolopoulos S, Green S and Wojnecki C 2008 Small SRS photon field profile dosimetry performed using a PinPoint air ion chamber, a diamond detector, a novel silicon-diode array (DOSI), and polymer gel dosimetry: analysis and intercomparison Med. Phys. 35 4640-8
16. Rogers D W, Faddegon B, Ding G X, Ma C M, Wei J and Mackie T 1995 BEAM: a Monte Carlo code to simulate radiotherapy treatment units Med. Phys. 22 503-24
17. Sánchez-Doblado F, Andreo P, Capote R, Leal A, Perucha M, Arráns R, Núez L, Mainegra E, Lagares J I and Carrasco E 2003 Ionization chamber dosimetry of small photon fields: a Monte Carlo study on stopping-power ratios for radiosurgery and IMRT beams Phys. Med. Biol. 48 2081-99
18. Sauer O and Wilbert J 2007 Measurement of output factors for small photon beams Med. Phys. 34 1983-8
19. Scott A J D, Nahum A E and Fenwick J D 2008 Using a Monte Carlo model to predict dosimetric properties of small radiotherapy photon fields Med. Phys. 35 4671-84
20. Scott A J D, Nahum A E and Fenwick J D 2009 Monte Carlo modeling of small photon fields: quantifying the impact of focal spot size on source occlusion and output factors, and exploring miniphantom design for small-field measurements Med. Phys. 36 3132-44
21. Westermark M, Arndt J, Nilsson B and Brahme A 2000 Comparative dosimetry in narrow high-energy photon beams Phys. Med. Biol. 45 685-702