The quality assurance of Varian enhanced dynamic wedges using Daily QA Check 2

Rutonjski, L.; Kuzmanovic, Z.; Baucal, M.; Petrović, Borislava; Teodorovic, M.

doi:10.2298/aoo0802007r

Cited by 1 publication

(2 citation statements)

References 6 publications

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“…The relationship between the delivered dose and the jaw position in dynamic wedge treatment is based on a segmented treatment table (STT), which provides a tabular representation of the jaw position versus the fraction of the dose that is delivered. For EDWs, treatment uses two STTs that are independent of the initial field size and wedge angle 4 , 5…”

Section: Introductionmentioning

confidence: 99%

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A study of enhanced dynamic wedge dosimetry using a 2D ion chamber array detector

Kumar¹,

Aparna

Anjana

et al. 2015

J Radiother Pract

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The purpose of this work was to study the dosimetric properties of the enhanced dynamic wedge using a Seven29 ion chamber array. The PTW Seven29 ion chamber array and solid water phantoms were used for the study. Primarily, the solid water phantoms with the two-dimensional (2D) array were scanned using a computed tomography scanner at different depths. Using these scanned images, planning was performed for different wedge angles at 6 and 15 MV. A dose of 100 CGy was delivered in each case. For each delivery, the required monitoring units (MUs) were calculated. Using the same setup with a Varian Clinac iX, the calculated MU was delivered for different wedge angles. Subsequently, the different wedged dose distributions that had been obtained were analysed using Verisoft software. A shoulder-like region was observed in the profile; this region reduced as depth increased. The percentage deviation between the planned and measured doses at the shoulder region fell within the range of 0·9–4·3%. The standard deviation between planned and measured doses at shoulder region in the profile fell within 0·08±0·02 at different depths. The standard deviations between planned and measured wedge factors for different depths (2·5, 5, 10 and 15 cm) were 0·0021, 0·0007, 0·0050 and 0·0001 for 6 MV and 0·0024, 0·0191, 0·0013 and 0·0005 for 15 MV, respectively. On the basis of the studies that we performed, it can be concluded that the 2D ion chamber array is a good tool for enhanced dynamic wedge dosimetry.

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Section: Introductionmentioning

confidence: 99%

“…For EDWs, treatment uses two STTs that are independent of the initial field size and wedge angle. 4,5 In this study, a Seven29 detector array (PTW, Freiburg, Germany) was used to evaluate EDW dosimetry. The purpose of the study was to examine the wedge factors and beam profiles of a wedge field.…”

Section: Introductionmentioning

confidence: 99%