Curvas de isodose no ar em uma sala de mamografia

Adad, Maria Cecília Baptista Todeschini; Hoff, Gabriela; Streck, Elaine Evaní; Lykawka, Rochele

doi:10.1590/s0100-39842008000400011

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…The absorbed dose distribution is represented by curves generated by points where the dose values are equal. Isodose curves are regular absorbed dose intervals drawn as depth dose distribution maps and can be expressed as a percentage of the absorbed dose at a reference point [2,18,25].…”

Section: Isodose Curvesmentioning

confidence: 99%

Dose Variation Profiles of Small Fields with a 10 MV Photon Beam

Teixeira¹,

Prata²

2023

Int J Oncol Res

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Radiotherapy is a treatment of carcinogenic tumors using ionising radiation and the improvement of radiotherapy techniques has been conducted to protection of healthy tissues. Recent implementations have employed static fields with small dimensions. The interests for this work were small fields, used in modern techniques such as Stereotactic Radiation Therapy (SRS) and Intensity Modulated Radiation Therapy (IMRT). These fields have special characteristics that refer to the non-establishment of the physical conditions idealized in traditional dosimetry protocols and localized imbalances of the photon spectrum. The obtained profiles allowed to verify disturbances present in the exposures, considering the dosimetry of small fields and the impacts on the planning of local dose deposition. In this work, the dose distribution of an X-ray beam was recorded using a solid water phantom. This phantom was irradiated using small fields with 1 × 1, 2 × 2, 3 × 3 and 5 × 5 cm 2 . The 10 MV X-ray beam was generated in a linear accelerator model Synergy Platform from the manufacturer Elekta and radiochromic film sheets were used to record dose profiles inside a solid water phantom. The solid water phantom loaded with radiochromic film was positioned 1m away from the X-ray beam's focus. The longitudinal profile of absorbed dose obtained presented the maximum dose value at 2.24 cm of depth for both fields, inside the phantom. Smaller field size generated a maximum absorbed dose smaller. The axial dose profiles were recorded at 1 cm depth, and presented a plateau in the axis Y for the four fields. For axial irradiation on the X-axis, the central region is 99.27% in relation to 100% of the relative dose and on the Y-axis, the central region is 99.39% in relation to 100% of the relative dose.

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Section: Isodose Curvesmentioning

confidence: 99%

Dose Variation Profiles of Small Fields with a 10 MV Photon Beam

Teixeira¹,

Prata²

2023

Int J Oncol Res

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“…Adad et al have determined the isodose curve in a mammography room and concluded that the utilization of additional shielding at mammography rooms is not necessary, since at distances > 0.50 m, the measurements generated absorbed doses < 0.1 mGy per exposure ( 2 ) . Vieira et al (Determination of isodose curves in brachytherapy with linear radiation sources.…”

Section: Introductionmentioning

confidence: 99%

Ambient radiation levels in positron emission tomography/computed tomography (PET/CT) imaging center

et al. 2015

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ObjectiveTo evaluate the level of ambient radiation in a PET/CT center. Materials and MethodsPreviously selected and calibrated TLD-100H thermoluminescent dosimeters were utilized to measure room radiation levels. During 32 days, the detectors were placed in several strategically selected points inside the PET/CT center and in adjacent buildings. After the exposure period the dosimeters were collected and processed to determine the radiation level. ResultsIn none of the points selected for measurements the values exceeded the radiation dose threshold for controlled area (5 mSv/year) or free area (0.5 mSv/year) as recommended by the Brazilian regulations. ConclusionIn the present study the authors demonstrated that the whole shielding system is appropriate and, consequently, the workers are exposed to doses below the threshold established by Brazilian standards, provided the radiation protection standards are followed.

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“… calibração e avaliação do desempenho de sistemas de imagens médicas; ; ; (HOFF, et. al., 2006)  desenvolvimento de programas de proteção radiológica e controle de qualidade destes equipamentos; ; (ADAD, et. al., 2008)  avaliação da qualidade da imagem; (PIRES, 2002); (PINA, et.…”

Section: Classificação E Aplicações Dos Simuladoresunclassified

Desenvolvimento de simulador mamográfico para avaliação de esquemas CAD

Stemberg¹

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Primeiramente agradeço a Deus, pela saúde e benção divina recebida e principalmente por iluminar meu caminho e dar força para ter chegado até aqui, superando todos os obstáculos e momentos difíceis ao longo desta caminhada, que por muitas vezes parecia inatingível. Ao Professor Dr. Homero Schiabel, pela forma competente que orientou este trabalho, por todo apoio e confiança depositada em mim durante este período, e principalmente por ter acreditado que eu era capaz quando me aceitou como sua aluna. Aos meus pais, Carlos e Raquel, pelo apoio incondicional, pela formação que com muito esforço me proporcionaram através do estudo e por nunca terem me deixado desistir. Vocês me ensinaram os valores da vida, e se hoje eu cheguei até aqui, com certeza devo isto a vocês. Obrigado por estarem do meu lado em todos os momentos. Eu amo vocês! Ao meu irmão Carlos Eduardo, que mesmo de longe, também sempre me apoiou e tenho certeza que torce por mim a cada etapa de minha vida. Você mora dentro de meu coração, obrigado por tudo. A todos do grupo LAPIMO, por todo este tempo de convivência no laboratório. A Evandra e Luciana, o meu muito obrigado por tudo que vocês sempre fazem por mim. Obrigado pelo carinho e pela disposição em estar ao meu lado. Ao Prof. Dr. Marcelo Andrade (Mogi) meu agradecimento por todas as vezes que me recebeu tirando dúvidas no decorrer deste trabalho. Ao Professor Thomaz Ghilardi Netto do Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto-HCFMRP/USP, por ter gentilmente cedido parte do material utilizado no desenvolvimento deste trabalho. Aos funcionários da EESC pela ajuda quando necessária e pela atenção em todos os momentos.

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Curvas de isodose no ar em uma sala de mamografia

Cited by 3 publications

References 2 publications

Dose Variation Profiles of Small Fields with a 10 MV Photon Beam

Dose Variation Profiles of Small Fields with a 10 MV Photon Beam

Ambient radiation levels in positron emission tomography/computed tomography (PET/CT) imaging center

Desenvolvimento de simulador mamográfico para avaliação de esquemas CAD

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