Intercomparison of Phantoms for CT Numbers to Relative Electron Density (RED)/Physical Density Calibration and Influence to Dose Calculation in TPS

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652052%3A_____%2F18%3AN0000001" target="_blank" >RIV/86652052:_____/18:N0000001 - isvavai.cz</a>

Výsledek na webu

<a href="https://docs.wixstatic.com/ugd/3110be_f271f132c62f4b788f07426476a369b3.pdf" target="_blank" >https://docs.wixstatic.com/ugd/3110be_f271f132c62f4b788f07426476a369b3.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Intercomparison of Phantoms for CT Numbers to Relative Electron Density (RED)/Physical Density Calibration and Influence to Dose Calculation in TPS

Popis výsledku v původním jazyce

Calibration curves from CT numbers to electron/physical densities in treatment planning systems (TPS) is an important part of commissioning. The aim of this work was to compare phantoms manufactured by different vendors. 6 phantoms were included in the study (2x CIRS, 1x Agmeco, 1x QUASAR, 1x Gammex, 1x CatPhan) to evaluate the sensitivity of dose calculated by TPS to calibration curve. All phantoms were scanned at two centres with 2 CT scanners under different protocols with various kV. The influence of different calibration curves on dose calculation in the TPS has been estimated. The presence of titanium and the scattering material has been evaluated. The sensitivity of RED to dose is higher for CT numbers higher than 100 HU (10% change in RED caused 3% and 1,5% in dose for 6MV and 18 MV respectively for material of 10 cm thickness). The largest sensitivity was observed for dense bone (up to 3,5% in dose for 6MV). The CT spectra can influence doses up to 4,5% and 2,5% for 6MV and 18 MV respectively. Two phantoms by the same vendor differed for dense bone up to 2% and 1% in dose for 6MV and 18 MV respectively. Phantoms used for CT-RED calibration were compared and various conditions and their influence to dose calculated by TPS was evaluated. Presented at 18th Asia-Oceania Congress of Medical Physics & 16th South-East Asia Congress of Medical Physics, A sustainable Future for Medical Physics: Book of Abstracts, 11th-14th November 2018, Kuala Lumpur, Malaysia (p. 141, A124).

Název v anglickém jazyce

Intercomparison of Phantoms for CT Numbers to Relative Electron Density (RED)/Physical Density Calibration and Influence to Dose Calculation in TPS

Popis výsledku anglicky

Calibration curves from CT numbers to electron/physical densities in treatment planning systems (TPS) is an important part of commissioning. The aim of this work was to compare phantoms manufactured by different vendors. 6 phantoms were included in the study (2x CIRS, 1x Agmeco, 1x QUASAR, 1x Gammex, 1x CatPhan) to evaluate the sensitivity of dose calculated by TPS to calibration curve. All phantoms were scanned at two centres with 2 CT scanners under different protocols with various kV. The influence of different calibration curves on dose calculation in the TPS has been estimated. The presence of titanium and the scattering material has been evaluated. The sensitivity of RED to dose is higher for CT numbers higher than 100 HU (10% change in RED caused 3% and 1,5% in dose for 6MV and 18 MV respectively for material of 10 cm thickness). The largest sensitivity was observed for dense bone (up to 3,5% in dose for 6MV). The CT spectra can influence doses up to 4,5% and 2,5% for 6MV and 18 MV respectively. Two phantoms by the same vendor differed for dense bone up to 2% and 1% in dose for 6MV and 18 MV respectively. Phantoms used for CT-RED calibration were compared and various conditions and their influence to dose calculated by TPS was evaluated. Presented at 18th Asia-Oceania Congress of Medical Physics & 16th South-East Asia Congress of Medical Physics, A sustainable Future for Medical Physics: Book of Abstracts, 11th-14th November 2018, Kuala Lumpur, Malaysia (p. 141, A124).

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20601 - Medical engineering

Projekt

<a href="/cs/project/FV20411" target="_blank" >FV20411: Radioterapeutický plánovací systém - optimalizace nejmodernějších algoritmů pro 3D výpočet dávky od externích svazků v těle pacienta a jejich integrace do nové generace plánovacího systému.</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů