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Objective: To observe the changes of inner ear in patients with Meniere's disease with 3D-FLAIR MRI after intratympanic (IT) gadolinium injection or intravenous (IV) gadolinium injection. Methods: Totally 36 patients with Meniere's disease were randomly divided into 2 groups. Eighteen of them underwent intravenous injection of GD-BOPTA (IV group), while the rest 18 underwent bilateral IT injection of equivalent dilution of GD-DTPA (IT group). 3D-FLAIR MR examinations were performed after 4 and 24 hours, respectively. ROIs in cochlear perilymph and medulla oblongata were drawn on MRI, and signal-intensity ratio (CM ratio) was subsequently evaluated and compared with paired t test. In addition, the ratio of endolymphatic hydrops (EH) of each group were separately observed and analyzed using chi-squared test. Results: For IT group, comparable CM ratios were found between the affected and unaffected sides of perilymph regions (1.86±0.74 vs 1.68±0.77,n=18,P=0.805). For IV group, significant difference of CM ratios was observed between the affected and unaffected sides of perilymph regions (1.46±0.31 vs 1.26±0.21, n=18, P=0.001). Meanwhile, significantly higher CM ratio was shown in affected sides of perilymph in IT group than that in IV group (1.86±0.74 vs 1.46±0.31,n=18, P=0.044), and significantly higher CM ratio was found in unaffected sides of perilymph in IT group than that in IV group (1.68±0.77 vs 1.26±0.21, n=18, P=0.032). Conclusion: Trans-tympanum administration and intravenous administration inner ear MRI show the same effect, and the former has higher signal intensity, while bilateral inner ear and blood-labyrinth barrier permeability could be observed using the latter with less injury.
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Objective To explore the sensitivity of a little amount of subarachnoid hemorrhage (SAH) between CT and different MR sequences through animal experiment,to find a more sensitive way to diagnosis SAH.Methods 18 healthy adult white New Zealand rabbits were randomly divided into two experimental groups(group A and group B) and one control group(group C).Rabbit SAH model was established by injecting blood into the cisterna magna one time.All rabbits underwent CT and MR scan at 2 hours,48 hours after operation.The findings on CT and different MR sequences were observed and recorded.Results ①In experimental groups(group A and group B),MR FLAIR sequences in the diagnosis of a little amount of SAH was more sensitive than that on MR T1WI,T2WI and CT in acute phase.And the diagnosis sensitivity between MR FLAIR and CT was statistically significant(P<0.05).②Abnormal signs of SAH could not be found in group C.Conclusion ①Rabbit SAH model was established successfully which will be the foundation for the follow-up study of medical imaging.②MR FLAIR sequence is more sensitive to diagnose a little amount of SAH in acute phase,and may be used in the routine diagnosis of SAH in acute phase.
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Objective To evaluate the diagnostic values of MRI symptoms of bursa hydrops in the subscapularis recess in patients with shoulder adhesive capsulitis. Methods The MRI image of 157 cases recieved from September 2012 to March 2014 were retrospectively ana-lyzed. The 62 cases who were diagnosed as adhesive capsulitis in the freezing phase were regarded as the adhesive capsulitis group; the 31 cases of partial tear of rotator cuff were regarded as the rotator cuff tear group;and the other 64 cases who were undiagnosed were regareded as the control group. The presence of fluid distension of the bursa in the subscapularis recess were evaluated on the T2-weightedfat-saturated images. Results Symptoms of bursa hydrops in the subscapularis recess were found in 55 patients (55/62) with shoulder adhesive capsuli-tis, 4 patients (4/31) with superior cuff tear, and 5 patients (5/64) in the control group. The mean diagnostic values were:veracity 0. 90;sensibility 0. 89;specificity 0. 91;positive predictive value 0. 86; negative predictive value 0. 92. Symptoms of bursa hydrops in the sub-scapularis recess have a good consistency with arthroscopic or pathological results (P<0. 001). Conclusion The MRI symptoms of bursa hydrops in the subscapularis recess has an important diagnostic value for the confirmation of shoulder adhesive capsulitis.
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Objective To evaluate the difference of image quality and lesion detection between Gd+-EOB-DTPA with Gd+-DTPA-enhanced MRI in cases of hepatocellular carcinoma (HCC).Methods A total of 21 HCC patients underwent both Gd+-EOB-DTPA and Gd+-DTPA-enhanced MRI examination,comparing the difference between the two agents using the value of lesion display quality index,sensitivity,specificity,positive and negative predictive value,diagnosis accuracy and CNR.Results There were 25 lesions on the 21 HCC patients with 9 lesions ＜ 1.0 cm.24 lesions showed hypointensity and 1 lesion showed isointensity on hepatobiliary phase with Gd+-EOB-DTPA-enhanced MRI.15 lesions showed hypointensity,5 lesions showed isointensity and 5 lesions showed hyperintensity on portal venous phase with Gd+-DTPA-enhanced MRI.The value of lesion (in particular for the lesion ＜ 1.0 cm)display quality index,sensitivity,specificity,positive and negative predictive value,diagnosis accuracy on Gd+-EOB-DTPA-enhanced MRI and Gd+-DTPA-enhanced MRI were 17scors,89％,89％,89％,89％ and 12 scors,33％,33％,33％,67％ respectively.CNR on hepatobiliary phase with Gd+-EOB-DTPA-enhanced MRI was 639.35.CNR on arterial phase and portal venous phase with Gd+-DTPA-enhanced MRI were 225.25 and 93.25 respectively.The data showed that Gd+-EOB-DTPA-enhanced MRI was better than that of Gd+-DTPA-enhanced MRI.Conclusions Gd+-EOB-DTPA-enhanced MRI displays lesions (especially for lesions ＜ 1.0 cm) better compared with Gd+-DTPA-enhanced MRI increasing the diagnostic accuracy of small HCC.