Evaluation of intensity modulated radiation therapy delivery system using a volumetric phantom on the basis of the task group 119 report of american association of physicists in medicine

Abstract

The current work describes the implementation of the American Association of Physicists in Medicine (AAPM)'s Task Group 119 report on a volumetric phantom (Delta4, Scandidos, Uppsala, Sweden) following the stated dose goals, to evaluate the step-and-shoot intensity modulated radiation therapy (IMRT) system. Delta4 consists of diode detectors, lying on two crossed planes, measuring the delivered dose, and providing two-dimensional dosimetric information. Seven plans of different goals and complexity were performed, with individual structure sets. TG199 structure sets and plans were transferred and implemented on the Delta4 phantom taking into account its cylindrical geometry. All plans were delivered with a 6 MV linear accelerator equipped with multileaf collimator of 1 cm thickness. Plan results for each test met the recommended dose goals. The evaluation was performed in terms of dose deviation, distance to agreement, and gamma index passing rate. In all test cases, the gamma index passing rate was measured >90%. Delta4 phantom has proven to be fast, applicable, and reliable for the step-and-shoot IMRT commissioning following TG119's recommended tests. Although AAPM's TG119 report is referring to the implementation of test plans that do not correspond to patient plans, it could be used as an evaluation tool of various IMRT systems, considering the local treatment planning system and the delivery system.

Validation of the RapidArc delivery system using a volumetric phantom as per task group report 119 of the American association of physicists in medicine

“…Avgousti et al . [ 17 ] also reported similar findings using a volumetric Delta4 phantom device for the evaluation of IMRT delivery as per AAPM TG 119. Ezzell et al .,[ 7 ] Mynampati et al .,[ 9 ] and Kaushik et al .…”

Effect of contrast medium on treatment modalities planned with different photon beam energies: a planning study

“…in the absence of contrast media. This experimental data was analyzed to make a resemblance with published data and made a comparison with results of AAPM TG 119 [11], Mynampati et al [12], Nithya et al [13], Lalit et al [14] and Kaushik et al [15].…”

Simulation of Image-Guided Microwave Ablation Therapy Using a Digital Twin Computational Model

“…As shown in Figs. 7 and 9 , this use of signed distance to agreement is similar to how Intensity Modulated Radiotherapy is planned and evaluated to achieve total tumor coverage [97] , [98] , [99] . Additionally, the signed distance between the ablation volume and the tumor (SDA A-T ) should be minimized to control surrounding tissue destruction.…”