Com a finalidade de se avaliarem as curvas isodose fornecidas pelo fabricante da unidade Cobalto 60 "Eldorado 78" n° 34, foram efetuadas medidas dose em profundidade e uma linha perpendicular ao raio central na 5cm com sem filtro cunha para diversos tamanhos campo. Os dados relativos à porcentagem profunda obtidos experimentalmente através das comparados os do Suplemento 11 British Journal of R...

PURPOSE The uterine tandem with open-ended vaginal cylinder is the most commonly used brachytherapy system for Federation Internationale de Gynecologie et d'Obstetrique (FIGO) Stage IIIA cervix cancer at the National Cancer Centre, Singapore. Without the 3-channel ovoid system, the dose to the parametrium is often compromised. In this study, a vaginal cylinder that could potentially be incorpor...

Purpose To present the acceptance and commissioning, to define reference dose, prepare data for a quality assessment (QA) program of an ultra-high dose rate (UHDR) electron device in order validate it preclinical animal FLASH radiotherapy (FLASH RT) experiments RT clinical human protocols. Methods The Mobetron® was evaluated with beams 9 MeV conventional (CONV) mode 6 UHDR (nominal energy). per...

BACKGROUND AND PURPOSE To compare partial-breast clinical target volumes generated using a standard 15 mm margin (CTV(standard)) with those generated using three-dimensional surgical excision margins (CTV(tailored 30)) in women who have undergone wide local excision (WLE) for breast cancer. MATERIAL AND METHODS Thirty-five women underwent WLE with placement of clips in the anterior, deep and ...

This study presents a 3D dose mapping of complex dose distributions using an x-ray computed tomography (CT) polymer gel dosimetry technique. Two polyacrylamide gels (PAGs) of identical composition were irradiated with the same four arc stereotactic treatment to maximum doses of 15 Gy (PAG1) and 8 Gy (PAG2). The PAGs were CT imaged using a previously defined protocol that involves image averagin...

A method is presented for checking the treatment time calculation for high dose rate (HDR) vaginal cylinder treatments. The method represents an independent check of the HDR planning system and can take into account nonuniform isodose line coverage around the cylinder. Only the air kerma strength of the source and information that is available from the written directive are required. The maximu...

Background: Field-in-field (FIF) technique for treatment of breast cancer has become a widely performed method over the recent years. However, there was no study in the application of FIF technique in patients with breast cancer undergoing mastectomy and lumpectomy. This study is an attempt to compare dosimetric outcomes after applying the FIF technique in these patients. Materials and Methods:...

BACKGROUND Standard applicators for cervical cancer Brachytherapy (BT) do not always achieve acceptable balance between target volume and normal tissue irradiation. We aimed to develop an innovative method of Target-volume Density Mapping (TDM) for modelling of novel applicator prototypes with optimal coverage characteristics. Patients and methods. Development of Contour-Analysis Tool 2 (CAT-2)...

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BACKGROUND 4-dimensional CT (4DCT) scans are increasingly used to account for mobility during radiotherapy planning. As variations in respiratory patterns can alter observed motion, with consequent changes in the generated target volumes, we evaluated the reproducibility of 4D target volumes generated during repeat uncoached quiet respiration. METHODS A retrospective analysis was performed on...