Introduction: The success of radiotherapy cancer treatment delivery depends on the accuracy of patient positioning for each treatment session. A number of kilovoltage x-ray volumetric imaging modalities with an additional source and detector have been developed to allow patient set-up verification based on the internal anatomy, but a significant portion of medical linacs are on...

The feasibility of real-time portal imaging during radiation therapy, through the Cherenkov emission (CE) effect is investigated via a medical linear accelerator (CyberKnife(®)) irradiating a partially-filled water tank with a 60 mm circular beam. A graticule of lead/plywood and a number of tissue equivalent materials were alternatively placed at the beam entrance face while the induced CE at t...

Knowing the normal anatomy, variations, congenital and acquired pathologies of the portal venous system are important, especially when planning liver surgery and percutaneous interventional procedures. The portal venous system pathologies can be congenital such as agenesis of portal vein (PV) or can be involved by other hepatic disorders such as cirrhosis and malignancies. In this article, we p...

Introduction: In order to reduce patient setup error in treatment field, portal images with treatment beam (megavoltage x-ray) are widely used. These images are acquired by electronic portal imaging devices (EPID). However, portal images suffer from insufficient anatomical information, contrast, and spatial resolution, because of the fact that Compton scatter is the main photon...

In this paper an existing ridge detector based on the Hessian tensor and a new one based on the structure tensor are evaluated for use in portal/simulator imaging. Tensor smoothing is introduced as a scaling parameter. By changing this scale (as opposed to the image scale) the detectors can be tuned to suppress spurious ridges without moving them. Desirable ridge detector properties for portal/...

In this paper an existing ridge detector based on the Hessian tensor and a new one based on the structure tensor are evaluated for use in portal/simulator imaging. Tensor smoothing is introduced as a scaling parameter. By changing this scale (as opposed to the image scale) the detectors can be tuned to suppress spurious ridges without moving them. Desirable ridge detector properties for portal/...

Aim: The aim of this prospective study was to determine and compare the various parameters and indices of portal vein, hepatic artery and splenic artery by sonographic Doppler imaging in chronic hepatitis C patients and healthy individuals.Methods: 45 Chronic Hepatitis C patients and 90 Healthy adults formed two groups. All participants underwent color Doppler imaging of the portal vein, hepati...

Aneurysmal dilatation of the portal vein (ADPV) is a rare cause of portal hypertension. We described a case of ADPV in a female patient who presented with ascites. Imaging studies revealed tortuosity and dilatation of the main portal vein with turbulent flow. Endoscopy revealed oesophageal varices. A liver biopsy showed no abnormalities in liver histology. This is the first case of ascites as a...

conclusions in our study, portal venous thrombosis was detected in the patient who died during the acute period only. a study including large numbers of budd-chiari-syndrome patients with behcet’s disease and portal venous thrombosis would be helpful to determine the prognostic significance of portal venous thrombosis in budd-chiari-syndrome patients with behcet’s disease. in addition, patients...