Dynamic wedges – dosimetry and quality control

Chełmiński, K.; Bulski, W.; Rostkowska, J; Kania, Małgorzata

doi:10.1016/s1507-1367(06)71050-1

Cited by 9 publications

(6 citation statements)

References 25 publications

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“…These findings are consistent with those found by all other authors we reference in this paper. As did Chelminski et al (5) , Shao et al (8) and Caprile et al, (10) for Helax, ADAC Pinnacle and Varian Eclipse TPS, respectively we found a slight disagreement in the edge of the toe for the lower energy. These results do not represent a serious limitation of the system, as they are limited to the last 5 mm of the toe.…”

Section: Discussionsupporting

confidence: 82%

“…Weber et al (4) in 1996 and Chelminski et al (5) in 2006 analyzed Helax TMS TPS, comparing calculated depth doses, profiles and output factors in dynamic wedge fields with the measured ones. In 1999, Papatheodorou et al (6) verified output factors and dose profiles calculations performed by ISiS3D TPS by measurements.…”

Section: Introductionmentioning

confidence: 99%

“…The main purpose of the present paper is to verify the implementation of the Varian EDW into the Oncentra MasterPlan TPS by comparing calculated EDW factors, depth doses, profiles and two-dimensional dose distributions with measured ones, and to compare the obtained results with those published for different treatment planning systems. (4)(5)(6)(7)(8)(9)(10)…”

Section: Introductionmentioning

confidence: 99%

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Verification of Varian enhanced dynamic wedge implementation in MasterPlan treatment planning system

Pasquino

Borca

Tofani

et al. 2009

J Applied Clin Med Phys

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This paper investigates the accuracy of the two available calculation algorithms of the Oncentra MasterPlan three‐dimensional treatment planning system (TPS) – the pencil beam method and collapsed‐cone convolution – in modeling the Varian enhanced dynamic wedge (EDW). Measurements were carried out for a dual high energy (6–15 MV) Varian DHX‐S linear accelerator using ionization chambers for beam axis measurements (wedge factors and depth doses), film dosimetry for off‐axis dose profiles measurements, and a diode matrix detector for two dimensional absolute dose distributions. Using both calculation algorithms, different configuration of symmetric and asymmetric fields varying the wedge's angle were tested. Accuracy of the treatment planning system was evaluated in terms of percentage differences between measured and calculated values for wedge factors, depth doses, and profiles. As far as the absolute dose distribution was concerned, the gamma index method (Low et al. (13) ) was used with 3% and 3 mm as acceptance criteria for dose difference and distance‐to‐agreement, respectively. Wedge factors and percentage depth doses were within 1% deviation between calculated and measured values. The comparison of measured and calculated dose profiles shows that the Van Dyk's acceptance criteria (Van Dyk et al. (14) ) are generally met; a disagreement can be noted for large wedge angles and field size limited to the low dose‐low gradient region only. The 2D absolute dose distribution analysis confirms the good accuracy of the two calculation algorithms in modeling the enhanced dynamic wedge.PACS number: 87.53.Bn, 87.55.kn, 87.56.ng

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Verification of Varian enhanced dynamic wedge implementation in MasterPlan treatment planning system

Pasquino

Borca

Tofani

et al. 2009

J Applied Clin Med Phys

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show abstract

“…It uses external radiation beams which are directed and intersect at the target volume. The purpose of modern radiotherapy is to receive a maximum dose distribution in the target volume while sparing surrounding healthy tissue [1]. In radiotherapy wedge filters are commonly used to modify the dose distribution of photon beams and to achieve a uniform dose distribution within the target volume.…”

Section: Introductionmentioning

confidence: 99%

“…In radiotherapy wedge filters are commonly used to modify the dose distribution of photon beams and to achieve a uniform dose distribution within the target volume. When the wedge filters are placed in the path of a photon beams, the beam quality is altered and the beam intensity is decreased [1][2][3][4][5][6]. Varian has upgraded its dynamic wedge to enhanced dynamic wedge (EDW), where some improvements have been introduced [7].…”

Section: Introductionmentioning

confidence: 99%