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ObjectiveTo investigate reproducibility of cardiac MRI for assessment of cardiac morphology and ventricular function in selected normal Chinese Han population.MethodsTwo hundred and sixty-nine normal volunteers underwent cardiac MRI using a 1.5 T MR system.HASTE and steady state free precession imaging were performed with long and short axis images and cine mode through the ventricle with wireless vector cardiac gating.The images were reviewed by two independent observers.The dimensions of cardiac chambers and ventricular function including ejection fraction (EF),end diastolic volume( EDV),end systolic volume (ESV) and myocardial mass were evaluated.The data between male and female were compared by using two-tailed unpaired t test.Results Total imaging time was (15 ± 3 ) min.The anteroposterior diameter of the left atrium was( 2.87 ± 0.77 ) cm,the right atrial diameter perpendicular to the atrial septum was ( 3.61 ± 0.57 ) cm,the end diastolic diameter of the left ventricle was (4.97 ±0.52) cm,the end diastolic diameter of the right ventricle was (2.65 ± 0.48) cm.On the left ventricle,EF was(60.62 ±7.08)％,EDV was (115.37 ±26.71) ml,ESV was (46.02+15.72) ml and LV mass was ( 82.97± 24.03 ) g.On the right ventricle,EF was (47.73 ± 6.50 ) ％,EDV was ( 128.27 ± 32.16 )ml,ESV was (67.7 ± 21.07) ml and RV mass was (48.24 ± 13.42) g.There were no statistically significant differences in LVESV( P =0.144 ),LVEDV index ( P =0.714 ),LVESV index ( P =0.113 ),LVCI ( P =0.199),RVEF ( P =0.296 ) and RV mass ( P =0.093 ),and statistically significant differences in other cardiac parameters between male and female.Conclusion Cardiac MRI can provide useful information about cardiac function and morphology with a high level of reproducibility in normal Chinese Han population.
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Ovbective To evaluate the role of electron beam computed tomography (EBCT) in diagnosis of anomalous pulmonary venous connection. Methods Retrospective analysis on 20 cases diagnosed as anomalous pulmonary venous connection by EBCT. The slice thickness and scan time was 1.5～3mm and 100ms respectively. 3～4ml/s non-ionic contrast medium was injected. Three-dimensional reconstruction of EBCT images was carried out in all cases with special workstation. Meanwhile,ultrasound echocardiography was performed on all patients and conventional cardiovascular angiography was performed on 10 patients as control. 14 cases were operated. Results (1) 4 patients with total anomalous pulmonary venous connection and 16 patients with partial pulmonary venous connection were diagnosed by EBCT preoperatively. (2) Compared with the findings from operations (14 cases),CT results (14 cases) corresponded well in 13 cases and corresponded partially in other 1 case. Meanwhile,ultrasound echocardiography (14 cases) only corresponded partially in 2 case and suggested suspected APVC (without any exact number and connective location of APVC were mentioned) in other 8 cases. Cardiovascular angiography was performed in 6 of 14 cases and APVC was found in 4 of them. (3) In 6 non-operation cases,four underwent conventional cardiovascular angiography. APVC were diagnosed in 2 only of these 4 cases. Meanwhile,the diagnoses of these 6 cases were all confirmed by CT ultrasound,echocardiography didn't yield positive findings of APVC. Conclusion EBCT might be significantly superior to UCG and angiography in the detection of anomalous pulmonary venous connection. According to our experience,EBCT with 3-D reconstruction was a noninvasive,effective method in the diagnosis of APVC.