A phantom study was conducted to investigate inherent positioning accuracy of an image-guided patient positioning system-the Novalis Body system for three-dimensional (3-D) conformal radiotherapy.
The coincidence of the coordinates between the patient-positioning system and the irradiation system was verified using the Daily QA system.
The purpose of this study was to evaluate the pressure placed on the shoulders as a function of varying degrees of head-down tilt (the Trendelenburg position) and to compare these pressures among 3 different patient-positioning systems.
On the other hand, the average Euclidean distance of tumor errors in the lung screening phantom was 4.84 ± 1.45 mm, which was measured by using an image guided patient positioning (IGPP) system in the radiotherapy system used for this study.
Virtual simulation CT studies are typically acquired on conventional diagnostic scanners equipped with an external patient positioning laser system and specialized planning and visualization software.
Localisation images will be obtained either with the Brainlab Exactrac system (6D patient positioning) [ 22] or the Varian On-Board Imaging system (3D positioning) [ 23].
The same 18F-FDG scan patient position and fixation system were used in order to improve reproducibility.
Patient positioning, subglottic secretion drainage, closed suctioning systems, probiotics, early tracheotomy, early enteral feeding, stress ulcer prophylaxis, silver-coated endotracheal tubes, oral decontamination with antiseptics or antibiotics, selective digestive decontamination without systemic antimicrobial therapy, and all the other interventions studied had no impact on mortality.
Patients were placed into a CRT positioning system (Rotorest, KCI, San Antonio, TX, USA) and the study was performed after 1 3 days of turning.
