Dosimetric Analysis of Physical and Enhanced Dynamic Wedge and Its Implicaton in 3D-Conformal Radiotherapy Planning Shahnawaz Ansari * , Subrat Satpathy, Anil Kumar, Santosh kumar, Nimish Kumar and BK Singh Apollo Hospitals Bilaspur (C.G), Bilaspur, Chhatsgarh, India * Corresponding author: Ansari S, M.Sc (Physics), D.R.P, Apollo Hospitals Bilaspur (C.G), Bilaspur, Chhatsgarh, India, Tel: 8968708521; E-mail: ansarisnz05@gmail.com Received Date: November 15, 2017; Accepted Date: January 08, 2018; Published Date: January 18, 2018 Copyright: © 2018 Ansari S, et al. This is an open-access artcle distributed under the terms of the Creatve Commons Atributon License, which permits unrestricted use, distributon, and reproducton in any medium, provided the original author and source are credited. Citaton: Ansari S, Satpathy S, Kumar A, kumar S, Kumar N, et al. (2018) Dosimetric Analysis of Physical and Enhanced Dynamic Wedge and Its Implicaton in 3D-Conformal Radiotherapy Planning. J Biomedical Sci. Vol.7 No.1:1. Abstract Background: Across the history of radiotherapy, wedges are generally used to modify the shape of isodose lines to achieve desired clinical dose coverage to the target and to reduce the hot spot as well. Aim: The main aim of this study was to analyse and compare the dosimetric propertes of Varian’s physical and enhanced dynamic wedges, and their dosimetric impact on radiotherapy plan (3D-Conformal). Materials and Methods: All plans were generated and evaluated in Varian’s eclipse planning system. For comparing the isodose line alteraton, the plans were prepared in water phantom with feld of size 10 cmx 10 cm. Wedges of angle 15°, 30°, 45° and 60° were used for generatng isodose lines in the current study. All wedge factors were measured in water phantom using FC65 farmer type chamber. Discussion: In the current study, the dosimetric characteristcs of EDW and PW were analyzed and compared. For analyzing the impact of EDW and PW, 22 patents were taken into consideraton, and 50 Gy dose was prescribed to PTV in 25 fractons. Conclusion: The analysis of EDW and PW shows slightly diferent dosimetric features. EDW gives beter target’s coverage, less hyper dose and comparatvely less MUs as compare to PW. Hence the use EDW in 3D-conformal radiotherapy plan is a prudent practce. Keywords Isodose line; Physical wedge; Enhanced dynamic wedge Background Across the history of radiotherapy, wedges are generally used as tssue compensator and beam modifer to improve the dose coverage to the target. In enhanced dynamic wedge, the required dose distributon is being achieved by sweeping acton one of the collimator jaws in two directons (IN and OUT) [1].Wedge flters are used to modify the shape of isodose curves, for that two beams are being deployed at diferent angles with small hinge angle at the target volume without creatng a hotspot. The wedge angle refers to the angle through which the isodose curves are tlted, relatve to their normal positon perpendicular to the beam axis at reference depth. The internatonal commission on radiaton units and measurements (ICRU) recommendaton for reference depth is 10 cm [2]. The presence of wedge flter in the beam path reduces the beam intensity and this must be taken into account during treatment planning. It is generally assumed that for wedged felds of diferent size, a single wedge factor measured for a reference feld size is valid for calculaton. Plta et al. examined feld size dependence of a wedge factor using the Varian Clinac -4 wedge flters and Philip’s SL75/5 auto wedge [3]. The Physical wedges (PW) have been the primarily means of producing the wedged felds. The required wedged dose profles can also be achieved by computer control moton of one of the jaws. This kind of wedge is called dynamic wedge [4], which was frst introduced by Varian medical system in early 1990s in linear accelerator [5]. The dynamic wedge provides a range of angle like 15°, 30°, 45°, and 60° for symmetrical feld size up to 20 cm width. Capability of dynamic wedge is signifcantly improved by introducing the concept of Varian’s enhanced dynamic wedge (EDW). Now the EDW provides wedge angle of 10°, 15°, 20°, 25°, 30°, 45°, and 60° for both symmetrical and asymmetrical feld sizes up to 30 cm width. A number of studies have been conducted on PW and EDW [6-8]. Many studies related to comparison of Varian’s PW and EDW stll have not been reported [9-12].The dosimetric impact of enhanced dynamic wedge factors (EDWF) for symmetrical and asymmetrical photon felds have been discussed in many literatures. Physical wedge is going to out of phase in future. Hence it is essental to analyze and understand the features of enhanced dynamic wedge so that users can use it judiciously. Aim The main aim of this study was to analyze the dosimetric propertes of Varian’s physical and enhanced dynamic wedge, Research Article iMedPub Journals http://www.imedpub.com/ DOI: 10.4172/2254-609X.100080 Journal of Biomedical Sciences ISSN 2254-609X Vol.7 No.1:1 2018 © Under License of Creative Commons Attribution 3.0 License | This article is available from: http://www.jbiomeds.com/ 1