Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2015.483.491AlashrahS. El-TaherA. 32015153Low spatial resolution in the penumbra region is normally encountered in a 2D array ImRT MatriXX which is commonly used in verifying Intensity Modulated Radiation Therapy (IMRT) plans. Low spatial resolution results from the size of a detector and the transport of secondary electrons from the walls into the measuring volume. In this study, a Gaussian convolution kernel was chosen to convolve the true dose profile of five nasopharynx IMRT plans calculated by Treatment Planning System (TPS). Gafchromic film (EBT2) and Monte Carlo simulation were also used to verify the true dose profile. The head of a LINAC (Artiste) and dose distribution in a water phantom for the selected field sizes were simulated using the EGSnrc (BEAMnrc/DOSXYZnrc) code and then compared to the ion chamber measurements. Good agreement in the dose profiles between ImRT MatriXX, IC03, EBT2 film and the Monte Carlo simulation were observed in the low gradient region. In the steeper dose gradients better agreement between ImRT MatriXX and IC03 was obtained after the Gaussian convolution kernel was applied to the IC03 data. The convolved dose distribution for IMRT plans were compared with the measured plans of a 2D array ImRT MatriXX. The passing rates improved significantly from 80.2-92.2% using the 3%/3 mm gamma index criteria when compared to cross dose profile plans from the treatment planning system after convolution correction. Convolution can minimize the difference in the beam profiles which occur due to the limited resolution of the ImRT MatriXX detector.]]>Alashrah, S., S. Kandaiya, L.S. Lum and S.K. Cheng,201323270278Alashrah, S., S. Kandaiya, N. Maalej and A. El-Taher,2014162338344Alashrah, S., S. Kandaiya, S.Y. Yong and S.K. Cheng,2010619181185Arjomandy, B., N. Sahoo, X. Ding and M. Gillin,20083538893894Arnfield, M.R., K. Otto, V.R. Aroumougame and R.D. Alkins,2005321218Bednarz, G., M.S. Huq and U.F. Rosenow,20024736433649Charland, P., E. El-Khatib and J. Wolters,199825152160Chetty, I.J., B. Curran, J.E. Cygler, J.J. DeMarco and G. Ezzell et al.,20073448184853Chu, R.D.H., D.F. Lewis, K.P.J. O'Hara, B.W. Buckland, F. Dinelle and G. Van Dyk,1990TM dosimetry media: A new high dose, thin film routine dosimeter and dose mapping tool.]]>35767773Devic, S., J. Seuntjens, G. Hegyi, E.B. Podgorsak and C.G. Soares et al.,20043123922401Fischer, M., M. Todorovic, E. Drud and F. Cremers,2010118191Fox, C., T. Simon, B. Simon, J.F. Dempsey and D. Kahler et al.,201037477484Gago-Arias, A., L. Brualla-Gonzalez, D.M. Gonzalez-Castano, F. Gomez and M.S. Garcia et al.,20125720052020Garcia-Vicente, F., J.M. Delgado and C. Rodriguez,200045645650Han, Z., S.K. Ng, M.S. Bhagwat, Y. Lyatskaya and P. Zygmanski,20103737043714Herzen, J., M. Todorovic, F. Cremers, V. Platz, D. Albers, A. Bartels and R. Schmidt,20075211971208Kamomae, T., Y. Miyabe, A. Sawada, O. Matoba and M. Nakata et al.,20114140147Kawrakow, I. and D.W.O. Rogers,20032003Laub, W.U. and T. Wong,200330341347Li, J.G., G. Yan and C. Liu,2009106274Looe, H.K., T.S. Stelljes, S. Foschepoth, D. Harder, K. Willborn and B. Poppe,201323129143Lydon, J.M.,20055027012714Matney, J.E., B.C. Parker, D.W. Neck, G. Henkelmann and I.I. Rosen,201011198208Meeks, S.L., F.J. Bova, S. Kim, W.A. Tome, J.M. Buatti and W.A. Friedman,199926729733Pappas, E., T.G. Maris, A. Papadakis, F. Zacharopoulou, J. Damilakis, N. Papanikolaou and N. Gourtsoyiannis,20063337003710Paskalev, K.A., J.P. Seuntjens and E.B. Podgorsak,20022002pp: 298-318pp: 298-318Poppe, B., A. Blechschmidt, A. Djouguela, R. Kollhoff, A. Rubach, K.C. Willborn and D. Harder,20063310051015Poppe, B., A. Djouguela, A. Blechschmidt, K. Willborn, A. Ruhmann and D. Harder,20075229212935Richley, L., A.C. John, H. Coomber and S. Fletcher,20105526012617Rogers, D.W.O., B.A. Faddegon, G.X. Ding, C.M. Ma, J. We and T.R. Mackie,199522503524Rogers, D.W.O., B. Walters and I. Kawrakow,20062006Spezi, E., A.L. Angelini, F. Romani and A. Ferri,20055033613373Tacke, M.B., S. Nill, P. Haring and U. Oelfke,2008TM, the new Siemens multileaf collimator.]]>3516341642Ulmer, W. and W. Kaissl,200348707727Van't Veld, A.A., P. Van Luijk, F. Praamstra and P.C. Van Der Hulst,200128738751Vandana, S., V.S. Shaiju, S.D. Sharma, S. Mhatre, S. Shinde, G. Chourasiya and Y.S. Mayya,201169130135Yan, G., C. Fox, C. Liu and J.G. Li,20083536613670Zeidan, O.A., S.A.L. Stephenson, S.L. Meeks, T.H. Wagner, T.R. Willoughby, P.A. Kupelian and K.M. Langen,20063340644072