ABSTRACT
Objective: To explore the feasibility of 320 row wide-detector CT in evaluation on cardiac function in postoperative congenital heart disease (CHD) children. Methods: Totally 25 postoperative CHD children underwent 320 row wide-detector CT and 3.0T MR cardiac scanning during following-up. The left and right ventricular ejection fraction (EF), end diastolic volume index (EDVI), end systolic volume index (ESVI), stroke volume index (SVI) and cardiac index (CI) were measured with corresponding cardiac function analysis software. The reproducibility of 320 row wide-detector results and their correlation with MRI results were compared and analyzed. Results: No significant difference of EF, EDVI, ESVI, SVI and CI was found between 320 row wide-detector CT and MRI results (all P>0.05), and CT results had good correlation with MRI(r=0.62-0.97, all P<0.05). The mean values of all index measured with CT were higher than those with MRI. The reproducibility of CT for measuring cardiac function indexes were good (ICC=0.85-0.98, all P<0.05). The volume index (EDVI, ESVI, SVI, CI) of left ventricular showed better reproducibility than that of the right ventricular. Conclusion: 320 row wide-detector CT could be used to evaluate cardiac function in postoperative CHD children, having a great value for those with contraindication for cardiac MR.
ABSTRACT
Objective To explore the value of DWI and ADC in differential diagnosis of benign prostatic hyperplasia (BPH)and prostatic cancer(PCa).Methods The data of 43 patients with BPH or PCa proven by histopathology were retrospectively reviewed. There were 21 patients with PCa and 22 patients with BPH.All of the patients were examined by DWI at 1.5T MRI.On the DWI,signal intensities in ROI were measured at the b value of 800 s/mm2 and 1 600 s/mm2 ,respectively.On the ADC map,ADC values in ROI were measured.The differences of the ADC values and the signal intensities of DWI were compared between the benign BPH and the PCa by using independent sample tGtest.Diagnostic efficiency of the signal intensity and the ADC value for PCa were analyzed by using ROC curve.Results There were statistically significant differences of the ADC values and the signal intensities of DWI at the b value of 800 s/mm2 and 1 600 s/mm2 between the BPH and the PCa (P＜0.05).The ADC at the b value of 1 600 s/mm2 had the highest diagnostic efficiency,the DWI at the b value of 1 600 s/mm2 took a second place,and the DWI at the b value of 800 s/mm2 was worst.Conclusion DWI and ADC are helpful for the diagnosis of PCa,and ADC at b value of 600 s/mm2 has the highest diagnostic efficiency.