Objective To investigate the variation law of apparent diffusion coefficient (ADC) and fractional anisotropy (FA) values in patients with cerebral infarction, and to explore the relationship between the changes and the prognosis of cerebral infarct patients. Methods Sixteen patients with cerebral infarction were recruited and divided into 2 groups:good recovery and poor rehabilitation. ADC and FA values were calculated in infarct areas and control areas which were the regions with symmetrical position and the same area as infarct areas. The difference of ADC and FA values in patients at acute and earlier chronic stage between the two areas were analyzed. Results ①At acute stage, ADC values in infarct areas were lower than those in control areas (P<0.05). At early chronic stage, there was no significant difference of ADC values between infarct areas and control areas (P>0.05), moreover ADC values were higher than that at acute phase (P<0.05). ②FA values in infarct areas were lower than those in control areas at both acute and early chronic stage (P<0.05). At early chronic stage, FA values were lower than those at acute stage (P<0.05). ③There was no significant difference of ADC and FA values at both acute and early chronic stage between good recovery group compared with poor rehabilitation group (P>0.05). Conclusion There are certainly rules in changes of ADC and FA values in patients with cerebral infarction at acute and earlier chronic stage.

ObjectiveTo investigate the postoperative 3D MRI appearances and their evolvement patterns of ACL grafts and bone tunnels at follow-up.Methods There were 26 double bundles ACL reconstructions and 16 single bundle ACL reconstructions,and a total of 56 follow-up 3D MR Imaging.MR images were reconstructed with MPR technique to evaluate grafts,bone tunnels,fixers and associated.complications.Proportions of grafts with hypointensity or hyperintensity and occurrence rates of marrow edema around bone tunnels were calculated respectively among groups of different periods after operation.ResultsThere were 24 grafts of hypointensity and 32 grafts of hyperintensity.Grafts of 2 cases were suspended with cross pins within femoral tunnels,graft of 1 case was suspended with an endobutton within the femoral tunnel,and grafts of other sites were fixed with interference screws.In the three periods as 3 months,6 to 9 months and over 12 months after cruciate ligament reconstruction,proportions of hypointensive grafts were 20/25,0/14 and 4/10 respectively,while proportions of hyperintensive grafts were 5/25,14/14 and 6/10 respectively,occurrence proportions of marrow edema around bone tunnels were 54/54,10/32 and 4/26 respectively.There was 1 tear graft,4 tibial tunnels placed anteriorly with ACL graft impingement on the intercondylar roof,3 femoral tunnels placed anteriorly,and 2 bone tunnels with mismatching interference screws.Conclusion3D MRI can accurately demonstrate the state of ACL grafts,bone tunnels,fixers and associated complications.Intensity of grafts presented a rise and reduce pattern after operation.

Objective To investigate the effect of slice orientation on the popliteomeniscal fasciculi (PMF) MR imaging and its normal MRI appearances. Methods Volumetric MRI data of 40 knees of healthy volunteers were acquired using an isotropic 3D turbo spin echo (TSE) MR sequence. The posterior tangential line to both femoral condyles was used as the reference line, and the long axis sectional images of the popliteal hiatus region were reformatted at 0°, 15°, 30°, 45°, 60°, 75° and 90° to the reference line. The MRI appearances of the PMF were scored respectively and classified. The final scores of the PMF at each slice angle were statistically analyzed by a repeated measure ANOVA. Results At 0°, 15°, 30°, 45°, 60°, 75° and 90° slice angles: scores of the anteroinferior fasciculi were (1.7±0.7), (1.8±0.6), (1.9±0.6), (2.0±0.7), (1.9±0.7), (1.8±0.8) and (1.0±0.5),respectively. Scores of the posterosuperior fasciculi were (1.5±0.7), (1.9±0.7), (2.1±0.6), (2.2±0.6),(2.2±0.6), (2.0±0.8) and (1.7±0.8), respectively. There were statistically significant differences in the average scores at each slice angle for both anteroinferior fasciculi (F = 29.744, P = 0.000) and posterosuperior fasciculi (F = 19.770,P =0.000). The anteroinferior fasciculi and the posterosuperior fasciculi had highest average scores at the angle of 45°. The percentage of type A, B and C of anteroinferior fascicali were 20.0% (8/40), 75.0% (30/40) and 5.0% (2/40), respectively. The percentage of type A, B and C of posterosuperior fasciculi were 37.5% (15/40) ,62.5% (25/40) and 0% (0/40) ,respectively. Conclusion The anteroinferior fasciculi and the posterosuperior fasciculi can be well depicted at the angle of 45° slice orientation.

Objective To evaluate spleen autotransplantation with lower esophagus transection for the treatment of portal hypertension by three-dimensional dynamic contrast-enhanced magnetic resonance angiography (3D-DCE MRA). Methods Twenty-eight patients were randomly divided into study group undergoing splenic autotransplantation and cardia-esophageal devascularization plus lower esophagus transection and control group without splenic transplantation. The cross section area, blood velocity and blood flow of main portal vein (MPV) were measured by 3D-DCE MRA, and the blood flow, collateral circulation of transplanted spleen were assessed. Results The cross section areas (cm ) of MPV of the two groups decreased postoperatively ( study group 1. 80 ? 0. 69 vs. 1. 20 ? 0. 73 , t = 13.96, P = 0. 00; control group 1. 78 ? 0. 43 vs. 1. 29 ? 0. 57, t = 11. 38, P = 0. 00). The mean blood velocity ( cm/s) of MPV decreased postoperatively (study group 9. 85 ? 0. 09 vs. 7. 06 ? 1. 98, t = 18. 98 , P = 0. 00; control group 10. 01 ?0. 43 vs. 8. 19 ?2. 44, t =22. 32, P =0. 00) in the two groups, and the mean blood velocity ' of MPV in study group was lower postoperatively than that in control group ( t = - 8. 02, P = 0. 00 ) . The mean blood flow (ml/s) of MPV decreased postoperatively (study group 15. 05 ? 2. 43 vs. 10. 52 ? 2. 55, 1 = 16.93, P=0. 00; control group 14. 81 ?2. 29 vs. 11.58 ?2. 96, t = 15. 90, P=0. 00) , and the mean blood flow of MPV in study group was lower postoperatively than that in control group (t = - 2. 73, P = 0. 02). Extensive collateral circulation developed around the transplanted spleen. Conclusions 3D-DCE MRA clearly shows the autotransplantated spleen and portal hemodynamics. It is an important non-invasive way to evaluate the result of the procedures.

OBJECTIVEThis work was done to compare the validity of various imaging methods, e.g. ultrasonography (US), computed tomography (CT), endoscopic retrograde cholangiopancreatography (ERCP), percutaneous transhepatic cholangiography (PTC), and, especially, magnetic resonance cholangiopancreatography (MRCP) for extrahepatic bile duct carcinoma.

METHODSSixty-five such patients who were operated and confirmed by pathology were used. Sixty patients had been examined by US; 52 by CT; 20 by ERCP; 9 by PTC and 20 by MRCP. The results of these imaging methods were compared with those of operative and pathological findings.

RESULTSThe diagnostic accuracy rates of site location were US 81.7%, CT 84.6%, ERCP 75.0%, PTC 88.9% and MRCP 100%, respectively. The quality diagnostic accuracy rates were US 73.3%, CT 82.7%, ERCP 75.0%, PTC 88.9% and MRCP 95.0%, respectively.

CONCLUSIONMRCP is superior to US, CT, ERCP and PTC not only in demonstrating the position but also the nature of extrahepatic bile duct carcinoma.

Adult ; Aged ; Aged, 80 and over ; Bile Duct Neoplasms ; diagnostic imaging ; pathology ; Cholangiocarcinoma ; diagnostic imaging ; pathology ; Cholangiopancreatography, Endoscopic Retrograde ; Female ; Humans ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Ultrasonography

Objective To discuss the value of CT and MRI in diagnosis of laryngeal non-Hodgkin's lymphoma(NHL).Methods The clinical data,CT and MRI findings and pathology of 26 patients with laryngeal NHL were analyzed retrospectively.Results Of 26 patients with laryngeal NHL,14 were diffuse large B-cell lymphoma,6 were NK/T-cell lymphoma,2 were follicular lymphoma,2 were small lymphocytic lymphoma(SLL),1 was angioimmunoblastic lymphoma and 1 was peripheral T-cell lymphoma.CT and MRI findings of laryngeal NHL:(1)laryngeal NHL showed homogeneous density on CT,slightly high signal intensity on T2WI,intermediate signal intensity on T1WI and moderate homogeneous enhancement;(2)laryngeal NHL was symmetrical and diffuse in appearance;(3)laryngeal NHL tended to spread through the submucosal and fat space,while muscle or cartilage invasion was quite rare but existed;(4)multisite lesions in Waldeyer's ring were obseverd occasionally.For those young male presenting diffuse multisite laryngeal lesion without a history of tuberculosis,a diagnosis of NHL should be raised.Conclusion CT and MRI can show the characteristics of the laryngeal NHL exactly,thus have applied value in detecting laryngeal NHL.