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@#Alar ligament is one of the most important craniocervical junction (CCJ) ligaments; acting as stabilizer of CCJ and limiting axial rotation. It may be involved in various pathological processes including trauma. Magnetic resonance imaging (MRI) is increasingly being used in cervical spine trauma as a supplement to conventional radiography and computed tomography (CT) to detect a wide range of severe cervical spine injuries. MR depiction of alar ligament requires special sequences despite no known established MR sequence is available. However, the role of MRI in minor or moderate trauma, including whiplash injuries, has long been debated, particularly when neurological dysfunction is absent, because no anatomical disruption other than degenerative disc disease have been reported. In this review, we provide detailed account on the current knowledge of MR visualization of normal alar ligament; outlining the variations in its signal intensity, dimension, shape and orientation.
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Objective To explore the clinical value of 3.0T nuclear magnetic resonance susceptibility weighted imaging in diagnosis of neonatal hypoxic ischemic encephalopathy,thus to provide guidance for the clinical.Methods From December 10,2015 to December 10,2017,100 cases of neonatal hypoxic ischemic encephalopathy (observation group) and 100 cases of normal newborns in Lishui People's Hospital during the same period accepted health examination (control group) were selected in the research.All the cases received 3.0T magnetic resonance susceptibility weighted imaging,the diagnostic value of 3.0T MR susceptibility weighted imaging was observed.Results The ADC value of the observation group[(0.00 1 13 ± 0.000 01)mm2/s] was significantly lower than that in the control group[(0.001 98 ±0.000 02)mm2/s] (P ＜0.05).The neonatal ADC value of the mild group[(0.001 21 ± 0.000 01)mm2/s] was significantly higher than that in the moderate group[(0.001 12 ± 0.000 02)mm2/s] and the severe group[(0.001 02 ± 0.000 03)mm2/s] (P ＜ 0.05).ADC value was positively correlated with neonatal hypoxic ischemic encephalopathy,namely,the lower the ADC value,the more serious the neonatal hypoxic ischemic encephalopathy.The fractional anisotropy value and relative anisotropy value of newborn babies in the observation group were significantly higher than those in the control group (all P ＜ 0.05).Conclusion For neonatal hypoxic ischemic encephalopathy patients,3.0T nuclear magnetic resonance susceptibility weighted imaging in the diagnosis is feasible,it can help the clinician to analyze the disease,and has positive significance to carry out the treatment.
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Objective To investigate the clinical value of 3.0T MRI for hilarcholangioc-arcinoma diagnosis.Methods T Totally48 hilarcholangiocarcinoma patients from October 2011 to June 2015 underwent diagnoses by 3.0T MRI and 64-slice spiral CT,and then the diagnosing results were compared with those by surgery and pathological examination to determine the value of 3.0T MRI for hilarcholangiocarcinoma diagnosis.Results 3.0T MRI had the positioning accuracy (100％) and qualitative accuracy (95.83％) significantly higher than the positioning accuracy (79.17％) and qualitative accuracy (81.25％) (P＜0.05).In case of hepatic duct dilatation,CT found 35 cases of hilar masses,14 cases of lymphoma,5 cases of hepatic duct wall invasion and 9 cases of portal vein invasion,while 3.0T MRI displayed 44 cases of hilar masses,26 cases of lymphoma,13 cases of hepatic duct wall invasion and 30 cases of portal vein invasion.Conclusion 3.0T MRI has high positioning and qualitative accuracies when used to diagnosing hilarcholangiocarcinoma,behaves well in displaying hepatic duct dilatation,high resolution of soft tissues,and thus is worthy promoting clinically.