Dosimetric Comparison of aSi1000 EPID and ImatriXX 2-D Array System for Volumetric Modulated Arc and Intensity Modulated Radiotherapy Patient Specific Quality Assurance
Prior to the use of detectors, characteristics
comparison study was performed and baseline established. In patient
specific QA, the portal dosimetry mean values of area gamma,
average gamma and maximum gamma were 1.02, 0.31 and 1.31 with
standard deviation of 0.33, 0.03 and 0.14 for IMRT and the
corresponding values were 1.58, 0.48 and 1.73 with standard
deviation of 0.31, 0.06 and 0.66 for VMAT. With ImatriXX 2-D
array system, on an average 99.35% of the pixels passed the criteria
of 3%-3 mm gamma with standard deviation of 0.24 for dynamic
IMRT. For VMAT, the average value was 98.16% with a standard
deviation of 0.86. The results showed that both the systems can be
used in patient specific QA measurements for IMRT and VMAT.
The values obtained with the portal dosimetry system were found to
be relatively more consistent compared to those obtained with
ImatriXX 2-D array system.
[1] T.Wiezorek., M. B. Nschwedas, D. Georg and T. G. Wendt,
"Dosimetric quality assurance for intensity-modulated radiotherapy
feasibility study for a filmless approach." Strahlenther. Oncol., vol. 81,
pp. 468-74, 2005.
[2] B F Branci, L Marrazzo and S Russo, "An inter comparison between
film dosimetry and diode matrix for IMRT quality assurance." Med.
Phys., vol.34, pp. 1372-1379, 2007.
[3] G J Budgell, Q Zhang, R J Trouncer and R I Mackay, "Improving IMRT
quality control efficiency using an amorphous silicon electronic portal
imager," Med. Phys., vol.32, pp.3267-78, 2005.
[4] P Winkler, A Hefner and D Georg, "Dose- response characteristics of
amorphous silicon EPID," Med. Phy.,; vol. 32, pp. 3095-105, 2005.
[5] E E Grein, R Lee and K Luchka "An investigation of a new amorphous
silicon electronic portal imaging device for transit dosimetry," Med.
Phys.vol 29: pp. 2262, 2002. R. W. Lucky, "Automatic equalization for
digital communication," Bell Syst. Tech. J., vol. 44, no. 4, pp. 547-588,
Apr. 1965.
[6] P. B. Greer, C. C and Popescu, "Dosimetric properties of an amorphous
silicon electronic portal imaging device for verification of dynamic
intensity modulated radiation therapy," Med. Phys., vol. 30, pp. 1618-27,
2003.
[7] E Spezi, A L Angelini, F Romani and A Ferri, "Characterization of a 2D
ion chamber array for the verification of radiotherapy treatments," Phys.
Med. Biol., vol. 50, pp. 3361-3373, 2005.
[8] B V Elsevier, "Evaluation of a 2D diode array for IMRT quality
assurance," Radiother. Oncol., vol. 70, pp.199-206, 2009.
[9] N Agazaryan,D S Timothy and J J Demarco, "Patient specific quality
assurance for the delivery of intensity modulated radiotherapy," J. Appl.
Clin. Med. Phys., vol. 4, 2003.
[10] C D Wagter, "The ideal dosimeter for intensity modulated radiation
therapy (IMRT): what is required?" Jr. Phys., vol. 3, pp. 4-8, 2004.
[11] W. V. Elmpt, L. Mcdermott, S. Nijsten, M. wending, et al, "A literature
review of electronic portal imaging for radiotherapy dosimetry,"
Radiother. oncol., vol. 88, pp. 289-309, 2008.
[1] T.Wiezorek., M. B. Nschwedas, D. Georg and T. G. Wendt,
"Dosimetric quality assurance for intensity-modulated radiotherapy
feasibility study for a filmless approach." Strahlenther. Oncol., vol. 81,
pp. 468-74, 2005.
[2] B F Branci, L Marrazzo and S Russo, "An inter comparison between
film dosimetry and diode matrix for IMRT quality assurance." Med.
Phys., vol.34, pp. 1372-1379, 2007.
[3] G J Budgell, Q Zhang, R J Trouncer and R I Mackay, "Improving IMRT
quality control efficiency using an amorphous silicon electronic portal
imager," Med. Phys., vol.32, pp.3267-78, 2005.
[4] P Winkler, A Hefner and D Georg, "Dose- response characteristics of
amorphous silicon EPID," Med. Phy.,; vol. 32, pp. 3095-105, 2005.
[5] E E Grein, R Lee and K Luchka "An investigation of a new amorphous
silicon electronic portal imaging device for transit dosimetry," Med.
Phys.vol 29: pp. 2262, 2002. R. W. Lucky, "Automatic equalization for
digital communication," Bell Syst. Tech. J., vol. 44, no. 4, pp. 547-588,
Apr. 1965.
[6] P. B. Greer, C. C and Popescu, "Dosimetric properties of an amorphous
silicon electronic portal imaging device for verification of dynamic
intensity modulated radiation therapy," Med. Phys., vol. 30, pp. 1618-27,
2003.
[7] E Spezi, A L Angelini, F Romani and A Ferri, "Characterization of a 2D
ion chamber array for the verification of radiotherapy treatments," Phys.
Med. Biol., vol. 50, pp. 3361-3373, 2005.
[8] B V Elsevier, "Evaluation of a 2D diode array for IMRT quality
assurance," Radiother. Oncol., vol. 70, pp.199-206, 2009.
[9] N Agazaryan,D S Timothy and J J Demarco, "Patient specific quality
assurance for the delivery of intensity modulated radiotherapy," J. Appl.
Clin. Med. Phys., vol. 4, 2003.
[10] C D Wagter, "The ideal dosimeter for intensity modulated radiation
therapy (IMRT): what is required?" Jr. Phys., vol. 3, pp. 4-8, 2004.
[11] W. V. Elmpt, L. Mcdermott, S. Nijsten, M. wending, et al, "A literature
review of electronic portal imaging for radiotherapy dosimetry,"
Radiother. oncol., vol. 88, pp. 289-309, 2008.
@article{"International Journal of Engineering, Mathematical and Physical Sciences:54638", author = "Jayesh K. and Ganesh T. and Suganthi D. and Mohan R. and Rakesh C. J. and Sarojkumar D. M. and Jacob S. J.", title = "Dosimetric Comparison of aSi1000 EPID and ImatriXX 2-D Array System for Volumetric Modulated Arc and Intensity Modulated Radiotherapy Patient Specific Quality Assurance", abstract = "Prior to the use of detectors, characteristics
comparison study was performed and baseline established. In patient
specific QA, the portal dosimetry mean values of area gamma,
average gamma and maximum gamma were 1.02, 0.31 and 1.31 with
standard deviation of 0.33, 0.03 and 0.14 for IMRT and the
corresponding values were 1.58, 0.48 and 1.73 with standard
deviation of 0.31, 0.06 and 0.66 for VMAT. With ImatriXX 2-D
array system, on an average 99.35% of the pixels passed the criteria
of 3%-3 mm gamma with standard deviation of 0.24 for dynamic
IMRT. For VMAT, the average value was 98.16% with a standard
deviation of 0.86. The results showed that both the systems can be
used in patient specific QA measurements for IMRT and VMAT.
The values obtained with the portal dosimetry system were found to
be relatively more consistent compared to those obtained with
ImatriXX 2-D array system.", keywords = "Gamma, IMRT, QA, TPS, VMAT.", volume = "7", number = "3", pages = "340-3", }