Radiological properties of high energy x-rays inside the in house developed heterogeneous thorax phantom

Dubey, Swati; Ghosh, Subir; Bagdare, Priyusha

doi:10.1063/5.0000693

Cited by 1 publication

(2 citation statements)

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“…Gamma index evaluations showed that no more than 3% of the points within the range of 3mm had a gamma value larger than one. 12 The percentage of points satisfying the above passing criteria was found by comparing the TPS generated 2D gamma fluence with that of the fluence obtained on the machine.…”

Section: Discussionmentioning

confidence: 99%

“…Materials used for the designing of HTP are chosen such that it replicates the radiological characteristics of tissues involved, which has been described earlier in detail. 12 Briefly, this phantom is made up of porous sawdust of pinewood (density: 0.24 g/cm3) to mimic the lung, honeybee's wax of density (density: 0.86 g/cm3) to replicate the soft-tissue region, and rib cage (density: 1.84 g/cm3) to represent the actual human thoracic bony cavity as shown in Figure 1. CT images of the designed HTP with 3.0 mm slice thickness were taken on Siemens Biograph PETCT (Siemens Medical Systems, Germany).…”

Section: Methodsmentioning

confidence: 99%

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Analysis of gamma index using in-house developed heterogeneous thorax phantom

Bagdare¹,

Dubey²,

Ghosh³

et al. 2021

IJRRT

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Quality assurance (QA) before patient treatment plays a major role in complex radiotherapy (RT) treatment planning. Phantoms are the standard materials that are used for the pre-treatment QA of patients. Contemporary phantoms used in RT are mainly water-based, having simple geometry and of uniform density. These phantoms dose not replicate the exact heterogeneities of the actual human body. The present work aims to evaluate the results of relative dosimetry performed on in-house developed heterogeneous thorax phantom (HTP) using an electronic portal imaging device (EPID). To perform the relative dosimetry, contours were drawn on HTP at three different locations and intensity modulated radiotherapy (IMRT), as well as Rapid ARC (RA), were generated on it to compare the fluence obtained on TPS as well as on linac machine. The gamma evaluation results indicate a strong correlation between planned and the measured fluence. We found the EPID-based QA done on HTP explore its property as a QA tool and it can further be used to perform patient-specific relative dosimetry.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%