4d rv function

RT3DE with full volume and harmonic imaging was recorded over 4–7 cardiac cycles with a matrix-array transducer. All recordings were electrocardiogram-gated and performed with a breath-hold technique. The images were gathered with an x3-1(iE33, Philips Health care) and a 4Z1C matrix-array transducer (Siemens Acuson SC2000).The apical view was used for recording although with a more off-axis approach to include the entire RV. Depth, sector size, angle, and focus were adjusted to focus on the region of interest in the RV. Two to four recordings were acquired for the RV. The datasets were saved in a digital format to a workstation connected to a TomTec server (TomTec Imaging Systems, Unterschleissheim, Germany) for further analyses. RV data were interpreted with 4D RV-Function (TomTec Imaging Systems) software. Before tracing, end-systole and end-diastole volumes were defined as the smallest and largest cavities, respectively. The endocardium was traced manually in end-systole and end-diastole in the 4-chamber, short-axis and coronal views. The endocardial border was detected semi-automatically, over a full cardiac cycle. Manual correction was performed to optimize the endocardial border delineation in all patients.