Diffusion tensor imaging map of anterior cruciate ligament contrasted with MRI in healthy adults / 中南大学学报(医学版)

OBJECTIVE@#To measure anterior cruciate ligament (ACL) by diffusion tensor imaging (DTI), combined with ACL half quantitative measurement magnetic resonance imaging (MRI) method as the contrast, and to preliminarily investigate the feasibility of DTI for ACL.@*METHODS@#The ACLs of 31 healthy volunteers were scanned with ordinary MRI and DTI. At ordinary MRI map, sagittal ACL-tibial angle, coronal ACL-tibial angle, Blumensaat line-ACL angle, angle of inclination of the intercondylar roof, and ACL-tibial insertion site were measured. As for DTI analysis of ACL, ACL was divide to 5 portions, namely 1(st), 2(nd), 3(rd), 4(th), 5(th), and all fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values of every portion were recorded and repeated.@*RESULTS@#The sagittal ACL-tibial angle, coronal ACL-tibial angle, Blumensaat line-ACL angle, angle of inclination of the intercondylar roof, and ACL-tibial insertion site were 53.00°±2.46°, 52.42°±5.15°, 12.67°±5.71°, 39.41°±2.64°, (24.90±2.84)%, respectively. FA values of different portions were 0.611±0.042, 0. 618±0.051, 0.596±0.045, 0.566±0.059, and 0.497±0.072. ADC values of 1(st)-5(th) portion were (1.068±0.216), (1.128±0.268), (1.189±0.197), (1.455±0.423), and (1.779±0.384)× 10(-3) mm(2)/s. The correlation coefficient of sagittal ACL-tibial angle and the FA value of 2(nd) and 3(rd) portion was -0.568 and -0.429. The correlation coefficient of Blumensaat line-ACL angle and the FA value of 1(st) and 4(th) portion was -0.507 and -0.633. The correlation coefficient of ACL-tibial insertion site and the FA value of 4(th) portion was -0.593, all with statistical significance. FA and ADC values of all portions in both team's ACL didn't have significant difference (P>0.05), but had obvious correlation.@*CONCLUSION@#DTI can be used to effectively evaluate the orientation and connection of ACL, having good contrast virtue with ACL half quantitative MRI measurement. It may provide more profound ACL information for clinicians, and it is of great significance for the further research and large sample data base of ACL pathology.

Comprehensive examination of visual electrophysiology of visual function assessment after cataract operation / 眼科新进展

Objective　To study the value of comprehensive examination of visual electrophysiology in prognosis of visual function after cataract operation.Methods　315 patients with cataract(408 eyes) underwent preoperative routine examination with pattern reversal visual evoked potential(PVEP), red and blue flicker electroretinogram(ERG) and oscillatory potential (OPs). Normal control group included 162 cases (266 eyes). All of the ocular fundi were examined postoperatively and corrected visual acuities were obtained 3 months after operation. Results　Postoperative corrected visions ≥0.5(Ⅰ) and ＜0.5(Ⅱ) in case group compared with that in control group, amplitudes of PVEP P100-wave decreased significantly and PVEP P100-wave latency times prolonged significantly in group Ⅰ and Ⅱ. There was much more prominent changes in P100-wave of group Ⅱ due to other factors influencing visual function. There wasn't significant difference of the amplitudes and the latency times of a-wave and b-wave of Red-Blue ERG in group Ⅰ and the control group preoperatively. The amplitudes of a-wave and b-wave of Red ERG decreased, the latency times of a-wave and b-wave of Red ERG prolonged, the amplitudes of a-wave and b-wave of Blue ERG decreased but latency times didn' t prolong in group Ⅱ. The value of OPs decreased in groupⅡ compared with that of the control group, which was related to the retinopathy due to blood circulation obstruction.Conclusion　Combined examination of visual electrophysiology can estimate visual function thoroughly. The prognosis will be good if various examinations are normal before operation, but will not be good if PVEP P100 latency time prolong, the amplitudes of a-wave and b-wave of Red ERG decrease and the latency time prolong, the amplitudes of a-wave and b-wave of Blue ERG decrease and the value of OPs decrease.