| Chronic obstructive salivary gland diseases were various kinds of local cause and result in obstruction of gland ducts, difficulties of salivary secretion, and recurrent swollen of glando Incidence of the disease is 15‰。Surgical sialoendoscopy is the best therapy method。Because sialoendoscopy field of vision is small and operation is in the duct lumen, a systemic, precies and preoperative evaluation about salivary duct and periphery should be made。MR sialography applied saliva as innate contrast solution, have no intubation to injection contrast solution and noninvasion demonstrate salivary duct lumen。However, these view resolution are too poorer to display ramulus of salivary duct。Our study goal is to improve quality of MR sialography image。Firstly, we construct human salivary duct model by magphan body model。Secondly, we designed various parameter, used the new 3D FIESTA sequence, and obtained different magphan body model views。Finally, we ascertain optimal parameter by comparing magphan body image spatial resolution, density resolution, signal-noise ratio, acquisition time。All those were physics experiment of this study。These optimal parameter applied to clinic。MR sialography were compared with the surgical sialoendoscopic findings。This comparion is the study focal point。We found in process 3D FIESTA sequence was more suitable for MR sialography at present。This technic features include higher signal-noise ratio, shorter acquisition time(five minutes), hypso- resolution, that can avoid swallowing movement artifical and detect the third branch of main duct in the gland。It was superior to other technic。Literature reported, the technic is resemble to digital sialography in sensitivity and duct lumen specificity。As a series of MR examination for salivary, those images demonstrated not only morphous alteration of duct lumen, but also shape of duct lesion and periphery structure。It was important for diagnosis, especially stage and surgical therapy of malignant disease。MR sialography date conveyed to the workstation。Three-dimensional reconstruction images and virtual endoscopic views gland ducts were generated with maximum intensity projection (MIP), shaded surface display(SSD), and volume rendering techniques (VRT). MIP and SSD could displayed main and 1～3 grade branches of gland duct, and know the total duct system。Marking a position on the original image, Virtual endoscopic view could minic the detect paths and direct the endoscopic to the diseased region with minimum wound. Otherwise, routine T1, T2 image could demonstrate duct wall and periphery。It could make stage of tumor。The virtual endoscopic images were compared with the operative observations。The results showed a good resemblance between the MR virtual endoscopic views and the findings of sial, endoscopic surgery。Our initial experience demonstrates that MR virtual endoscopy is an effective and promising noninvasive diagnostic technique, which provides clear, detailed, and high-resolution endoluminal views of the salivary gland duct。The virtual endoscopic views are comparable to surgical sialoendoscopic findings。Clinical application of MR virtual endoscopy as a presurgical procedure before sialoendoscopy provides surgeons with direct morphologic and pathologic information supporting the preoperative foresight and planning procedure。This topic was in the process of deep study. Initiatory result has been published in the SCI。We are applying for the Health Department Scientific Research Found to support our study。... |
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