Introduction: Radiation therapy using electron beams is a promising method due to its physical dose distribution. Monte Carlo (MC) code is the best and most accurate technique for forespeaking the distribution of dose in radiation treatment of patients.Materials and Methods: We report an MC simulation of a linac head and depth dose on central axis, along with profile calculations. The purpose o...

Fig. 1. Transverse CTscan showing the tumour originating from the right inferior pulmonary vein (PV) andoccupying thewhole of the left atrium (T). Note the left sided pleural effusion (E) and associated collapsed left lower lobe. Fig. 2. Pre-operative trans-thoracic echocardiography (five chamber view) showing the tumour (T) extending from the pulmonary vein (PV) and the left atrium (LA) into t...

Background: Exposure conditions in CT examinations are quite different from conventional Xray. In CT examination higher dose is given to patient in comparison with the dose in other diagnostic examinations. In order to calculate organ effective dose in chest CT, Monte Carlo simulation has been used in this study. Materials and Methods: The Impact survey data were used to determine the ...

Methods The patient, a 60-year-old man, was conscious and haemodynamically stable at admission to the hospital after a car accident in 80 km/h. No neurological deficits were found. CTscan showed a U-shaped fracture of the sacrum in the S2 level and bilateral fracture of the transverse processes in L5. The pelvic ring was intact. The fracture was thus treated conservatively, since there was insi...

The patient is a 69-year-old male with a symptomatic, fusiform distal arch/proximal descending aortic aneurysm extending over 9 cm in length. As demonstrated in the CTscan, the distal arch aneurysm is 5.5 cm diameter with a newly detected symptomatic ventral sac extending to 6 cm in diameter, presenting as a penetrating aortic ulcer (PAU). The ascending aorta is ectatic to 4.5 cm. His risk fact...

background: the assessment of rbe quantity in the treatment of cancer tumors with proton beams in treatment planning systems (tps) is of high significance. given the significance of the issue and the studies conducted in the literature, this quantity is fixed and is taken as equal to 1.1. objective: the main objective of this study was to assess rbe quantity of proton beams and their variations...

Background: During intensity modulated radiation therapy (IMRT) technique, theoretically, presence of flattening filter (FF) across the beamline of clinical linear accelerator (linac) is not essential to obtain uniform lateral profiles due to intensity modulation of photon beams by multileaf collimators (MLCs). The aim of this study was to investigate the dosimetrical properties of 18 MV photon...

OBJECTIVE To evaluate epidemiologic, clinical, pathologic and therapeutic characteristics of the mesenteric cysts in hospitals of Sergipe, Brazil. METHODS Mesenteric cysts were assessed by a non-interventional cross-sectional study from the archives of the Pathology Laboratory of Federal University of Sergipe between 1995 and 2007. The charts of the patients were reviewed in order to find out...