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Objective To evaluate the diagosis value of different spiral computed tomography(CT) chest scanning methods in the differentiation of various pulmonary diseases,in order to avoid x-ray irradiation damage and reduce patients economic burden,but the diagnosis criterion should be guaranteed still.Methods 1000 cases of chest scan by spiral CT were randomly analyzed.In 927 conventional scan cases,including 155 cases of simple plainscan,474 cases of direct contrast scan,25 cases of plain plus contrast scans,73 cases of CT angiography.In addition,high resolution CT(HRCT) for 105 cases,thin layer scan for 86 cases,dynamic scan for 6 cases,and 40 cases bronchgraphy diagnosis were also carried out in the conventional scanning cases.Results The different CT scanning methods were adapted for diffenent pulmonary diseases.An adaptive scanning method and technique can decrease X-ray irradiation dosage and rise accuracy of diagnosis.Conclusions Aptimal scanning method and technique should be alternative according the clinical need and the patients status.
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Objective To investigate the techniques of lower limbs MRI. Methods 50 patients underwent lower limbs MRI examinations on 1.5T scanner using 4-channel torso coil, in which 28 were femur and 22 were tibia and fibula. Pulse sequences included FSE T2WI and SE T1WI. All FSET2WI were added with fat saturation. FOV is 42cm?42cm. Imaging planes included axial, coronal and saggital views. Slice thickness ranged from 8mm to10mm on axial and 4mm to 5mm on sagital or coronal view. Results Axial view could delineated the anatomical relationship of the lesions. Coronal or sagital view could show the global view and relation to the adjacent structure. Conclusion The proper scan skill, optimized parameters and proper pulse sequences are essential for better delineation of the anatomy of the lower extremities and helpful for the location and the diagnosis.