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Vertebral Stereotactic ablative body radiotherapy (SABR) involves substantial tumour density heterogeneities. We evaluated the impact of a linear Boltzmann transport equation (LBTE) solver dose calculation on vertebral SABR dose distributions. A sequential cohort of 20 patients with vertebral metastases treated with SABR were selected. Treatment plans were initially planned with a convolution style dose calculation algorithm. The plan was copied and recalculated with a LBTE algorithm reporting both dose to water (Dw) or dose to medium (Dm). Target dose as a function of CT number, and spinal cord dose was compared between algorithms. Compared with a convolution algorithm, there was minimal change in PTV D90% with LBTE. LBTE reporting Dm resulted in reduced GTV D50% by (mean, 95% CI) 2.2% (1.9–2.6%) and reduced Spinal Cord PRV near-maximum dose by 3.0% (2.0–4.1%). LBTE reporting Dw resulted in increased GTV D50% by 2.4% (1.8–3.0%). GTV D50% decreased or increased with increasing CT ....
Kaufmann destacó la repavimentación de la ruta 1 entre Cayastá y Helvecia : : El Litoral - Noticias - Santa Fe - Argentina ellitoral.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from ellitoral.com Daily Mail and Mail on Sunday newspapers.
Un giovane turista della provincia di Napoli, un 25enne in vacanza a Gallipoli, la notte scorsa è stato investito da un'auto mentre passeggiava con alcuni amici in via Delle Dune, nella zona della Baia Verde. (ANSA) ....
Ancora violenza cieca nelle strade di Roma. Una situazione che peggiora di giorno in giorno. Stavolta, teatro degli episodi di cronaca è il quartiere . ....