Objective To explore the pathogenesis of juvenile disorders of spine facet joints and to clarify the diagnosis by concluding the clinical and imaging manifestations.Methods Retrospectively analyzed imaging data of 250 patients from 10～30 years with disorders of spine facet joints including X-ray and CT and MRI.Results Reasons of juvenile disorders of spine facet joints has unique imaging manifestations of asymmetric of small joints and joint surface hyperplasia like pen,of nonspecial inflammation in surrounding soft tissue.Conclusions Imaging can diagnose and differentiate diagnosis juvenile disorder of spine facet joints.X-ray is also the primary method.Not only.CT or MRI image can more clearly display the changes of spine facet joints and surrounding soft tissue,but also differentiate diagnosis disc henaiation and other diseases.

Objective To evaluate the imaging features of acute necrotizing encephalopathy caused by children A H1N1 influenza.Methods CT and MRI brain imaging data of three children acute necrotizing encephalopathy caused by A H1N1 influenza virus and proved by clinical and laboratory investigation were analyzed.All the three children got CT and MRI scan because of coma while in hospital.Results All cases represented multifocal damage,and some were symmetrical.Bilateral thalamencephalons were involved in the all cases.Bilateral grey and white matters of frontal lobe,temporal lobe,parietal lobe and occipital lobe,and hippocampi,putamina,external capsule,brain stem,bilateral cerebellum,could be seen multifocal damage,and some were symmetrical.All the cases showed brain swelling in varying degrees.These region presented low density in CT,hypointensity on T1 weighted series and hyperintensity on T2 weighted series and FLAIR series in MRI.Conclusion The imaging features of acute necrotizing encephalopathy caused by children A H1N1 influenza represented multifocal and symmetrical damage and brain swelling.It may be characteristic that bilateral thalamencephaloas were involved.The patient was serious,and fatality rate was high.So we should pay much attention to acute necrotizing encephalopathy caused by children A H1 N1 influenza.

Objective To evaluate the ability of two sets parameters of the volome rendering technich(VRT)with multislice spiral CT(MSCT)to display the normal inner ear.Methods Fifty-eight inner ears of twenty-nine healthy volunteers were scanned and reconstructed with VRT.The images of VRT were recombinated with two sets(A,B)of parameters.Results The semicirculares、cochlea,vestibule,fenestra cochleae and vestibuli of inner ear could be visualized clearly by VRT images with"A"group's parameters.The vestibuli was displayed unsharply by VRT images with"B" group's parameters.Conclusions The double-threshold segmentation matching with manuleditor of VRT was successfully used to separate the inner ear from the temporal bone.And the semicirculares,cochiea,vestibule,fenestra cochleae and vestibuli of inner ear could be displayed clearly by VRT images of"A"group's parameters(threshold:256～765,935～1019,brightness:42,opacity:70).