Posters

Abstract

Objective To evaluate the accuracy of MRI combined with sensitivity encoded (SENSE) technique for diagnosis conotruncal defects (CTD) in children. Materials and methods Twenty-seven patients with CTD and ten volunteers underwent MR. The patients were performed cardiac catheterization and surgical operations. MRI sequences included ECG-gated HASTE, TrueFISP, and fast cine (TrueFISP and fast cine with SENSE, the reduce factor = 2, 1.5-T Avanto, Siemens). The diameters of ascending aorta (AAO), main pulmonary artery (MPA), left and right pulmonary artery (L-RPA) in patients were measured, and the right ventricular function parameters including ejection fraction (EF), end diastolic volume (EDV), end systolic volume (ESV), and mean myocardial mass (MM) of 20 children (TOF, n=10, volunteers, n= 10) were estimated by LEONARDO Syngo2004A software system. The anatomic findings of MRI were compared with those of catheterization, and the function results of patients compared with those of volunteers by SSPS 11.5 analysis software. Results The relationship of great artery at the level of semilunar valves are depicted with axial TrueFISP and HASTE MR images. MRI diagnosis included TOF (n=15), L-TGA (n=2), and DORV (n=10). Compared to catheterization, MRI had 100% sensitivity and specificity for the diagnosis of CTD. MPA, RPA, LPA hypoplasia or stenosis were noted by MRI. There was complete agreement between catheterization and MRI identification of PA abnormality. There were significant differences for EF, EDV, ESV, and MM of RV in patients and volunteers. Conclusion MRI combined with SENSE not only detects the cardiovascular anatomy abnormalities, but also comprehensively assess cardiac function. P2MRI evaluation of the right ventricular outflow tract and of the right ventricle in pediatric patients after the Ross procedure