The value of 3D-iMSDE MR neurography in the determination of the anatomical relationship between intraparotid facial nerve and parotid ducts and parotid tumors / 中华放射学杂志

Objective To investigate the spatial relationship between intraparotid facial nerve and parotid ducts in different types of parotid neoplasms with 3D improved motion-sensitized driven-equilibrium pulse (3D-iMSDE) MR neurography, and to guide the operation plan. Methods By means of prospective research methods, the sequences of 3D-iMSDE and 3D-T2-fast field echo (3D-T2-FFE) were obtained in 30 healthy volunteers and 40 patients with parotid gland tumors, respectively. All patients with parotid mass were found by physical examination, by maxillofacial surgeons or by ultrasonography or other imaging examinations. Facial nerve trunk with its first branches and parotid ducts were evaluated independently on images of iMSDE and T2-FFE sequence for volunteers. The signal intensity ratio (SIR) of both facial nerve and parotid ducts were compared respectively in two sequences The relationship between intraparotid facial nerve and parotid ducts with the lesion were analyzed on images of iMSDE and T2-FFE sequences for 40 patients. The results were compared with intra-operative anatomy and post-operative pathological findings.Wilcoxon symbolic rank test, t test and chi-square test were used Results The image scores of intra-parotid facial nerve and parotid ducts in iMSDE sequence were higher than that of T2-FFE sequence in all 30 healthy volunteers. The difference was statistically significant (Z=-6.197,P<0.05). Both the facial nerve and parotid duct on images of iMSDE sequence had higher SIR than that of T2-FFE. The differences were statistically significant (t=10.772,11.586, respectively;P<0.05). Forty patients with parotid gland tumors had a total of 41 lesions. Compared with the intraoperative anatomy, the accuracy of iMSDE and T2-FFE sequences in showing the relationship between the facial nerve and its primary branches with the mass were 36/41 (87.8%), and 22/41 (53.7%) respectively, and the accuracy of the two sequences in showing the relationship between the dominant duct of the parotid gland and the mass were 38/41 (92.7%) and 30/41 (73.2%), respectively.The accuracy rate in showing the relationship between facial nerve and its primary branch and the mass on images of iMSDE sequence were higher than that of T2-FFE sequence, and also in showing the relationship of parotid duct and the mass. The statistical differences were significant (χ2=9.725, 5.513;P<0.05,respectively). In the iMSDE sequence, the relationship between the facial nerve and its first branches (temporofacial and cervicofacial division) with the tumor was correctly demonstrated in 36 cases. 38 cases of parotid ducts were satisfactorily displayed on image of iMSDE sequence. Conclusions The 3D-iMSDE MRN sequence can correctly show the relationship between intraparotid facial nerve and parotid duct and the parotid gland neoplasms.

The value of 3D-iMSDE MR neurography in the determination of the anatomical relationship between intraparotid facial nerve and parotid ducts and parotid tumors / 中华放射学杂志

Objective@#To investigate the spatial relationship between intraparotid facial nerve and parotid ducts in different types of parotid neoplasms with 3D improved motion-sensitized driven-equilibrium pulse (3D-iMSDE) MR neurography, and to guide the operation plan.@*Methods@#By means of prospective research methods, the sequences of 3D-iMSDE and 3D-T2-fast field echo (3D-T2-FFE) were obtained in 30 healthy volunteers and 40 patients with parotid gland tumors, respectively. All patients with parotid mass were found by physical examination, by maxillofacial surgeons or by ultrasonography or other imaging examinations. Facial nerve trunk with its first branches and parotid ducts were evaluated independently on images of iMSDE and T2-FFE sequence for volunteers. The signal intensity ratio (SIR) of both facial nerve and parotid ducts were compared respectively in two sequences The relationship between intraparotid facial nerve and parotid ducts with the lesion were analyzed on images of iMSDE and T2-FFE sequences for 40 patients. The results were compared with intra-operative anatomy and post-operative pathological findings.Wilcoxon symbolic rank test, t test and chi-square test were used@*Results@#The image scores of intra-parotid facial nerve and parotid ducts in iMSDE sequence were higher than that of T2-FFE sequence in all 30 healthy volunteers. The difference was statistically significant (Z=-6.197,P<0.05). Both the facial nerve and parotid duct on images of iMSDE sequence had higher SIR than that of T2-FFE. The differences were statistically significant (t=10.772,11.586, respectively;P<0.05). Forty patients with parotid gland tumors had a total of 41 lesions. Compared with the intraoperative anatomy, the accuracy of iMSDE and T2-FFE sequences in showing the relationship between the facial nerve and its primary branches with the mass were 36/41 (87.8%), and 22/41 (53.7%) respectively, and the accuracy of the two sequences in showing the relationship between the dominant duct of the parotid gland and the mass were 38/41 (92.7%) and 30/41 (73.2%), respectively.The accuracy rate in showing the relationship between facial nerve and its primary branch and the mass on images of iMSDE sequence were higher than that of T2-FFE sequence, and also in showing the relationship of parotid duct and the mass. The statistical differences were significant (χ2=9.725, 5.513;P<0.05,respectively). In the iMSDE sequence, the relationship between the facial nerve and its first branches (temporofacial and cervicofacial division) with the tumor was correctly demonstrated in 36 cases. 38 cases of parotid ducts were satisfactorily displayed on image of iMSDE sequence.@*Conclusions@#The 3D-iMSDE MRN sequence can correctly show the relationship between intraparotid facial nerve and parotid duct and the parotid gland neoplasms.

The application of mr dti in cerebra infarction of optic radiation / 实用放射学杂志

Objective To evaluate the fiber altering and clinical relationship in patients with occipital and temporal lobe cerebral infarction with DTI.Methods Fifty patients suffering from cerebral stroke were analyzed with conventional MRI,DWI and DTI. The fibers of visual pathway were depicted ,and their fractional anisotropy (FA),apparent diffusion coefficient (ADC),isotropic im-age (Iso)and T2-weighted trace were measured and analyzed.Results Regions of interest (ROIs)were placed in infarction and nor-mal contralateral tissue for tracking the visual pathways.The different parameters were measured.FA is useful to differentiate hy-per-acute stroke from acute and sub-acute stroke.FA values increased slightly in hyper-acute and decreased in acute,sub-acute and chronic phase.The values of ADC in infarction regions in hyper-acute,acute and sub-acute phases were lower than those of the con-tralateral tissue.Iso and T2-weighted trace increased in acute phase and decreased in chronic phase.DTT was used to show the way and chang of visual pathway.Conclusion DTI could track the fiber of visual pathway,and depict the fiber of infarction zone.DTT could be used in evaluating the prognosis of patients.

3 T MR 3D fast imaging employing steady state acquisition demonstrating branches of intraparotid facial nerve, parotid duct, and relation with parotid tumors / 中华放射学杂志

Objective To investigate the usefulness of 3 T MRI 3D-FIESTA in the evaluation of the intraparotid components of the facial nerve and parotid duct, and compare them with surgical findings. Methods Twenty-two cases with parotid benign tumors were scanned with conventional and 3D-FIESTA sequences on 3 T MRI scanner. Postprocessed multiplanar images were obtained with the workstation. Parotid ducts and facial nerves and tumors were identified on these images. The relationship of the tumors to the facial nerves and Parotid ducts was confirmed at surgery. Results Various types of parotid benign tumors had their characteristics on 3 T MR imaging. Parotid benign tumors mainly showed hypo-intensity on T_1WI in 21 cases, and hyper-intensity on T_2WI in 22 cases. But on 3D-FIESTA images, they appeared hypo-intensity (10 cases) or high intensity (12 cases) due to different types. Facial nerves in parotid appeared as linear structures with hypo-inteusity. The indication of the main trunks were 16 and 18 cases for T_1WI and T_2WI images, while on 3D-FIESTA images, the main trunks and cervicofacial and temporofacial divisions of the facial nerves were found in 22, 21,22 cases. Parotid ducts appeared as structures with hypo-intensity on T_1WI and hyper-intensity on multiplanar images (14, 20, 22 cases). Compared with surgical results, the main trunks of the facial nerve were correctly showed by 3D-FIESTA images in 20 cases. However, in 2 cases they were not located in the operation because of shifting. Conclusion 3 T MR 3D-FIESTA imaging could depict the extracranial facial nerve and the parotid duct in the parotid gland, which is useful for preoperative evaluation of parotid gland tumors.

Magnetic resonance imaging guided bone biopsies in the iPath-200 system / 中华医学杂志(英文版)

<p><b>OBJECTIVE</b>To study the clinical value of a new MRI compatible percutaneous bone biopsy system.</p><p><b>METHODS</b>Twenty-six patients with bone lesions MRI-guided biopsies underwent using a 0.23-T open MR system combined with an iPath-200 optical leading system.</p><p><b>RESULTS</b>Of the 26 biopsies, 23 samples were sufficient for histological examination and the histopathologic diagnoses were confirmed. In the high-risk areas like spine, the biopsies were successfully done in 11 patients. No procedural complications occurred.</p><p><b>CONCLUSION</b>Percutaneous biopsy of bone lesions performed under MRI-guidance in an iPath system was proved to be accurate and safe.</p>

Multislice spiral CT myocardial perfusion and coronary angiography in acute myocardial infarction: an experimental study / 中华放射学杂志

0.05).But significant enhancement was found after LAD ligation for 4 hours (82.1?15.2) HU.MSCT coronary angiography could show the blockage of LAD in nine dogs.Conclusion MSCT myocardial perfusion combined with coronary angiography could estimate myocardial ischemia and infarction,and show the blockage of the coronary artery.

Value of High Field MRI in Detecting the Fetal Corpus Callosum Agenesis Suspected by US / 实用放射学杂志

Objective To explore the value of MRI in detecting the corpus callosum agenesis suspected by US.Methods 19 women with complicated pregnancies,aged from 20 to 37 years(average 28 years) and with gestation from 20 to 38weeks(average 29 weeks) were studied with a 1.5 T superconductive MR unit within 24 hours after ultrasound examinations and suspected with fetal corpus callosum agenesis.T2WI and T1WI were performed using HASTE and FLASH,respectively.The features of MRI and ultrasound were compared with that of autopsy or follow-up outcome.Results Of the 19 fetus,14 cases with fetal corpus callosum,3 cases with mild enlargement of lateral cerebral ventricle and 2 cases with leukodystrophy were confirmed by MRI.Of them,accompained with Dandy-Walker syndrome in one and lipoma of corpus callosum in one.One case of Dandy-Walker syndrome and microcephalus respectively missed by US was detected by MRI.Conclusion MRI is superior in displaying fetal corpus callosum agenesis than ultrasound,which is helpful in conforming the diagnosis of fetal corpus callosum,classification and additional cerebral anomalies.