To the Editor: Recently, a detailed comparative study regarding intracranial Gamma Knife (GK) vs. CyberKnife (CK) intracranial dosimetry has been published by your Journal.(1) In a group of 15 patients with 26 brain metastases, we showed that CK produced more homogeneous and conformal plans, while the GK plans had sharper peripheral dose falloff in most cases. In the CK plans, by convention, th...

In this study, we examined the factors contributing to brain radiation necrosis and its predictors of patients treated with Cyberknife radiosurgery. A total of 94 patients with primary or metastatic brain tumours having been treated with Cyberknife radiotherapy from Sep. 2006 to Oct. 2011 were collected and retrospectively analyzed. Skull based tracking was used to deliver radiation to 104 targ...

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...

a method is described whereby the isodose curves of a cobalt unit were measured, using a simple photographic technique. the method reduces the effects of experimental errors and artifacts by cross_plotting the constants of decrement liner. the method is self-calibrating, and affords a useful allernative to the more usual water phantom pro:edures, in cases when this apparatus is not available

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 ...