Implementation and validation of portal dosimetry with an amorphous silicon EPID in the energy range from 6 to 25 MV

Physics in Medicine and Biology

Volumn 52, Issue 15, 2007, Pages

  Winkler, Peter ^a   Hefner, Alfred ^b   Georg, Dietmar ^a  

^a MEDICAL UNIVERSITY OF VIENNA   (Austria)

^b ARC SEIBERSDORF RESEARCH GMBH   (Austria)

Author keywords

[No Author keywords available]

Indexed keywords

AMORPHOUS SILICON; IONIZATION CHAMBERS; NORMAL DISTRIBUTION; SCATTERING;

CONVOLUTION KERNELS; EPID SCATTERING; HEAD SCATTER FACTORS;

DOSIMETRY;

SILICON DIOXIDE;

ACCURACY; ARTICLE; DOSE RESPONSE; DOSIMETRY; ENERGY; GAMMA RADIATION; IONIZATION; IRRADIATION; KERNEL METHOD; MEASUREMENT; PRIORITY JOURNAL; VALIDATION PROCESS;

COMPUTER-AIDED DESIGN; DOSE-RESPONSE RELATIONSHIP, RADIATION; EQUIPMENT DESIGN; EQUIPMENT FAILURE ANALYSIS; RADIATION DOSAGE; RADIOMETRY; REPRODUCIBILITY OF RESULTS; SENSITIVITY AND SPECIFICITY; SILICON; TRANSDUCERS;

EID: 34547115940     PISSN: 00319155     EISSN: 13616560     Source Type: Journal    
DOI: 10.1088/0031-9155/52/15/N05     Document Type: Article

References (27)

1. Budgell G J, Zhang R and Mackay R I 2007 Daily monitoring of linear accelerator beam parameters using an amorphous silicon EPID Phys. Med. Biol. 52 1721-33
2. Budgell G J, Zhang Q, Trouncer R J and Mackay R I 2005 Improving IMRT quality control efficiency using an amorphous silicon electronic portal imager Med. Phys. 32 3267-78
3. Chang J, Mageras G S, Ling C C and Lutz W 2001 An iterative EPID calibration procedure for dosimetric verification that considers the EPID scattering factor Med. Phys. 28 2247-57
4. Essers M, Hoogervorst B R, van Herk M, Lanson H and Mijnheer B J 1995 Dosimetric characteristics of a liquid-filled electronic portal imaging device Int. J. Radiat. Oncol. Biol. Phys. 33 1265-72
5. Georg D, Kroupa B, Winkler P and Pötter R 2003 Normalized sensitometric curves for the verification of hybrid IMRT treatment plans with multiple energies Med. Phys. 30 1142-50
6. Georg D, Olofsson J, Künzler T and Karlsson M 2004 On empirical methods to determine scatter factors for irregular MLC shaped beams Med. Phys. 31 2222-9
7. Greer P B 2005 Correction of pixel sensitivity variation and off-axis response for amorphous silicon EPID dosimetry Med. Phys. 32 3558-68
8. Heijmen B J M, Pasma K L, Kroonwijk M, Althof V G M, de Boer J C J, Visser A G and Huizenga H 1995 Portal dose measurement in radiotherapy using an electronic portal imaging device (EPID) Phys. Med. Biol. 40 1943-55
9. Herzen J, Todorovic M, Cremers F, Platz V, Albers D, Bartels A and Schmidt R 2007 Dosimetric evaluation of a 2D pixel ionization chamber for implementation in clinical routine Phys. Med. Biol. 52 1197-208
10. Keller H, Fix M and Rüegsegger P 1998 Calibration of a portal imaging device for high-precision dosimetry: a Monte Carlo study Med. Phys. 25 1891-902
11. Kirkby C and Sloboda R 2005 Comprehensive Monte Carlo calculation of the point spread function for a commercial a-Si EPID Med. Phys. 32 1115-27
12. Low D A, Harms W B, Mutic S and Purdy J A 1998 A technique for the quantitative evaluation of dose distributions Med. Phys. 25 656-61
13. McCurdy B M C, Luchka K and Pistorius S 2001 Dosimetric investigation and portal dose image prediction using an amorphous silicon electronic portal imaging device Med. Phys. 28 911-24
14. McDermott L N, Louwe R J W, Sonke J-J, van Herk M B and Mijnheer B J 2004 Dose-response and ghosting effects of an amorphous silicon electronic portal imaging device Med. Phys. 31 285-95
15. Olofsson J, Georg D and Karlsson M 2003 A widely tested model for head scatter influence on photon beam output Radiother. Oncol. 67 225-38
16. Olofsson J, Nyholm T, Georg D, Ahnesjö A and Karlsson M 2006 Evaluation of uncertainty predictions and dose output for model-based dose calculations for megavoltage photon beams Med. Phys. 33 2548-56
17. Parent L, Seco J, Evans P M, Fielding A and Dance D R 2006 Monte Carlo modelling of a-Si EPID response: the effect of spectral variations with field size and position Med. Phys. 33 4527-40
18. Press W H, Teukolsky S A, Vetterling W T and Flannery B P 2002 Numerical Recipes in C++: The Art of Scientific Computing 2nd edn (Cambridge: Cambridge University Press)
19. Siebers J V, Kim J O, Ko L, Keall P J and Mohan R 2004 Monte Carlo computation of dosimetric amorphous silicon electronic portal images Med. Phys. 31 2135-46
20. Steciw S, Warkentin B, Rathee S and Fallone B G 2005 Three-dimensional IMRT verification with a flat-panel EPID Med. Phys. 32 600-12
21. Van Esch A, Depuydt T and Huyskens D P 2004 The use of an aSi-based EPID for routine absolute dosimetric pre-treatment verification of dynamic IMRT fields Radiother. Oncol. 71 223-34
22. van Gasteren J J M, Heukelom S, van Kleffens H J, Van Der Laarse R, Venselaar J L M and Westermann C F 1991 The determination of phantom and collimator scatter components of the output of megavoltage photon beams: measurement of the collimator scatter part with a beam-coaxial narrow cylindrical phantom Radiother. Oncol. 20 250-7
23. Vieira S C, Dirkx M L P, Pasma K L and Heijmen B J M 2003 Dosimetric verification of x-ray fields with steep dose gradients using an electronic portal imaging device Phys. Med. Biol. 48 157-66
24. Warkentin B, Steciw S, Rathee S and Fallone B G 2003 Dosimetric IMRT verification with a flat-panel EPID Med. Phys. 30 3143-55
25. Wendling M, Louwe R J W, McDermott L N, Sonke J-J, van Herk M and Mijnheer B J 2006 Accurate two-dimensional IMRT verification using a back-projection EPID dosimetry method Med. Phys. 33 259-73
26. Winkler P and Georg D 2006 An intercomparison of 11 amorphous silicon EPIDs of the same type: implications for portal dosimetry Phys. Med. Biol. 51 4189-200
27. Winkler P, Hefner A and Georg D 2005 Dose-response characteristics of an amorphous silicon EPID Med. Phys. 32 3095-105