Evaluation of the Portal Imaging System Performance for an Elekta Precise Linac in Radiotherapy

Publish Year: 1397
نوع سند: مقاله ژورنالی
زبان: English
View: 367

This Paper With 9 Page And PDF Format Ready To Download

  • Certificate
  • من نویسنده این مقاله هستم

استخراج به نرم افزارهای پژوهشی:

لینک ثابت به این Paper:

شناسه ملی سند علمی:

JR_IJMP-15-4_014

تاریخ نمایه سازی: 18 تیر 1398

Abstract:

Introduction: Electronic portal imaging devices (EPIDs) provide two- and three-dimensional planar and volumetric cone beam images to improve the accuracy of radiation treatment delivery. Periodic quality assurance (QA) of EPIDs is essential for dosimetric verification in radiotherapy. In this study, a QA program was implemented to evaluate the function of the EPID to be confident in applying corrections for the uncertainty of patient set-up. Material and Methods: Firstly, the safety features were verified, and the uniformity of EPID response was evaluated using flat panel detector. Additionally, the contrast and spatial resolutions of the EPID were assessed using detail counting of the Los Vegas phantom images by visualization method and measuring the modulation transfer function using edge technique, respectively. Moreover, a combination of smoothing methods was used for optimal use of edge detection algorithm for the noisy portal images. Finally, the location of the central ray on the EPID surface at different gantry angles was determined to evaluate the mechanical stability of the supporting arm. Results: The safety interlocks were found to be functional.The EPID response variation was less than 3% according to the results obtained from the detector. The contrast resolution met the recommended tolerance; however, the visualization method was widely observer-dependent. The value of f50 for spatial resolution was 0.401±0.005 lp/mm for the photon energy of 6 MV. The supporting arm deviation was within ±1 mm. Conclusion: The periodic QA of image guidance system gave confidence to apply the corrections for set-up in clinic.

Authors

Fatemeh Shahedi

Medical Physics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.

Mehdi Momennezhad

Medical Physics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.

shahrokh Nasseri

Medical Physics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.

Hamid Gholamhosseinian

Medical Physics Research center, Mashhad University of Medical Sciences, Mashhad, Iran

مراجع و منابع این Paper:

لیست زیر مراجع و منابع استفاده شده در این Paper را نمایش می دهد. این مراجع به صورت کاملا ماشینی و بر اساس هوش مصنوعی استخراج شده اند و لذا ممکن است دارای اشکالاتی باشند که به مرور زمان دقت استخراج این محتوا افزایش می یابد. مراجعی که مقالات مربوط به آنها در سیویلیکا نمایه شده و پیدا شده اند، به خود Paper لینک شده اند :
  • O Daniel JC, Garden AS, Schwartz DL, Wang H, Ang ...
  • Bedford JL. Treatment planning for volumetric modulated arc therapy. Medical ...
  • Fredh A, Korreman S, af Rosenschöld PM. Automated analysis of ...
  • Kirby M, Glendinning A. Developments in electronic portal imaging systems. ...
  • Van Herk M, Meertens H. A matrix ionisation chamber imaging ...
  • Heijmen B, Pasma K, Kroonwijk M, Althof V, De Boer ...
  • Das IJ, Cao M, Cheng C-W, Misic V, Scheuring K, ...
  • Midgley S, Millar R, Dudson J. A feasibility study for ...
  • Bissonnette J-P, editor Quality assurance of image-guidance technologies. Seminars in ...
  • Tournel K, De Ridder M, Engels B, Bijdekerke P, Fierens ...
  • Gopal A, Samant SS. Use of a line‐pair resolution phantom ...
  • Klein EE, Hanley J, Bayouth J, Yin FF, Simon W, ...
  • Bissonnette JP, Balter PA, Dong L, Langen KM, Lovelock DM, ...
  • Kanakavelu N, Samuel EJ. Assessment and evaluation of MV image ...
  • Low DA, Klein EE, Maag DK, Umfleet WE, Purdy JA. ...
  • Herman MG, Balter JM, Jaffray DA, McGee KP, Munro P, ...
  • Smith PL. New technique for estimating the MTF of an ...
  • Rout BK, Shekar MC, Kumar A, Ramesh KK. Quality control ...
  • Cunningham IA, Reid BK. Signal and noise in modulation transfer ...
  • E. Samei, M. Flynn and D. Reimann, A method for ...
  • Gustafsson H, Vial P, Kuncic Z, Baldock C, Greer PB. ...
  • Winkler P, Hefner A, Georg D. Dose‐response characteristics of an ...
  • Van der Sypt, Jan, Carlos De Wagter, and Luc Van ...
  • Sukumar P, Padmanaban S, Jeevanandam P, Kumar SS, Nagarajan V. ...
  • Balter JM, Antonuk LE. Quality Assurance for kV and MV ...
  • Buhr E, Günther‐Kohfahl S, Neitzel U. Accuracy of a simple ...
  • Fujita H, Tsai D-Y, Itoh T, Doi K, Morishita J, ...
  • Greer PB, Van Doorn T. Evaluation of an algorithm for ...
  • Marshall N. Early experience in the use of quantitative image ...
  • Hassanein AS, Mohammad S, Sameer M, Ragab ME. A survey ...
  • Carton AK, Vandenbroucke D, Struye L, Maidment AD, Kao YH, ...
  • Saunders RS, Samei E. A method for modifying the image ...
  • B. Hasegawa, The Physics of Medical X-Ray Imaging, Madison, Wisconsin: ...
  • Donovan M, Zhang D, Liu H. Step by step analysis ...
  • Rowshanfarzad P, McGarry CK, Barnes MP, Sabet M, Ebert MA. ...
  • Bailey DW, Kumaraswamy L, Bakhtiari M, Malhotra HK, Podgorsak MB. ...
  • Sun B, Goddu SM, Yaddanapudi S, Noel C, Li H, ...
  • Elekta Customer Acceptance tests for iViewGT. Document number: 45133701945 04. ...
  • Bissonnette JP, Jaffray DA, Fenster A, Munro P. Optimal radiographic ...
  • Levitt SH, Purdy JA, Perez CA, Vijayakumar S. Technical basis ...
  • Kavuma A. Transit dosimetry based on water equivalent path length ...
  • Jomehzadeh A, Shokrani P, Mohammadi M, Amouheidari A. A quality ...
  • Clements R, Luchka K, Pouliot J, Sage J, Shalev S. ...
  • Doi K. Basic imaging properties of radiographic systems and their ...
  • JJ. Sonke. In-room imaging techniques. In: KK. Brock. Image Processing ...
  • Rowshanfarzad P, Riis H, Zimmermann S, Ebert M. A comprehensive ...
  • نمایش کامل مراجع