Organ doses assessment in the anthropomorphic phantom of one-year-old child – verification of measurement by Monte Carlo simulation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652052%3A_____%2F18%3AN0000025" target="_blank" >RIV/86652052:_____/18:N0000025 - isvavai.cz</a>

Výsledek na webu

<a href="https://guarant.topinfo.cz/iupesm2018/en/book-of-abstracts" target="_blank" >https://guarant.topinfo.cz/iupesm2018/en/book-of-abstracts</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Organ doses assessment in the anthropomorphic phantom of one-year-old child – verification of measurement by Monte Carlo simulation

Popis výsledku v původním jazyce

Organ doses were assessed for paediatric radiographic procedures of skull, chest and abdomen. Firstly, organ doses were measured by thermolumniscence dosimeters (TLD) LiF:Mg,Cu,P placed in an anthropomorphic phantom of one-year-old child (ATOM 704-B, CIRS, Norfolk). Batch of 100 dosimeters was used for every procedure to cover the volume of interest sufficiently. The phantom was irradiated in the NRPI calibration laboratory using clinical x-ray machine DRGEM. Exposure parameters were set in accordance with clinical protocols (from four faculty hospitals). TLDs were calibrated in air kerma in spectra equivalent to spectra used for the phantom irradiation. The reference dosimeter was ionization chamber Radcal 6 cm3. The TLD glow curves were obtained by Harshaw 4500. Measured organ doses were compared with organ doses calculated in PCXMC. There was no systematic correspondence or difference, due to differences in tissue densities and shape of the organs. Consequently, Monte Carlo simulation using a voxelized phantom was considered. At the time of submitting this abstract, the voxelization was being performed using CT images of the anthropomorphic phantom. CT conversion ramp was created from tissue pixel value distributions determined in selected CT slices using ImageJ. Proper voxelization from dicom images was performed by EGSnrc ctcreate. Head and abdomen parts were voxelized separately to avoid stack overflow. The application EGSnrc dosxyznrc was used for this Monte Carlo simulation. Presented at Book of Abstracts (World Congress on Medical Physics & Biomedical Engineering, June 3-8, 2018, Prague, Czech Republic).

Název v anglickém jazyce

Organ doses assessment in the anthropomorphic phantom of one-year-old child – verification of measurement by Monte Carlo simulation

Popis výsledku anglicky

Organ doses were assessed for paediatric radiographic procedures of skull, chest and abdomen. Firstly, organ doses were measured by thermolumniscence dosimeters (TLD) LiF:Mg,Cu,P placed in an anthropomorphic phantom of one-year-old child (ATOM 704-B, CIRS, Norfolk). Batch of 100 dosimeters was used for every procedure to cover the volume of interest sufficiently. The phantom was irradiated in the NRPI calibration laboratory using clinical x-ray machine DRGEM. Exposure parameters were set in accordance with clinical protocols (from four faculty hospitals). TLDs were calibrated in air kerma in spectra equivalent to spectra used for the phantom irradiation. The reference dosimeter was ionization chamber Radcal 6 cm3. The TLD glow curves were obtained by Harshaw 4500. Measured organ doses were compared with organ doses calculated in PCXMC. There was no systematic correspondence or difference, due to differences in tissue densities and shape of the organs. Consequently, Monte Carlo simulation using a voxelized phantom was considered. At the time of submitting this abstract, the voxelization was being performed using CT images of the anthropomorphic phantom. CT conversion ramp was created from tissue pixel value distributions determined in selected CT slices using ImageJ. Proper voxelization from dicom images was performed by EGSnrc ctcreate. Head and abdomen parts were voxelized separately to avoid stack overflow. The application EGSnrc dosxyznrc was used for this Monte Carlo simulation. Presented at Book of Abstracts (World Congress on Medical Physics & Biomedical Engineering, June 3-8, 2018, Prague, Czech Republic).

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20602 - Medical laboratory technology (including laboratory samples analysis; diagnostic technologies) (Biomaterials to be 2.9 [physical characteristics of living material as related to medical implants, devices, sensors])

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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