Int J Comput Assist Radiol Surg - Diffusion tensor tractography of normal facial and vestibulocochlear nerves.

Tópicos

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Resumo

RPOSE: Diffusion tensor tractography (DTT) is not adequately reliable for prediction of facial and vestibulocochlear (VII-VIII) nerve locations, especially relative to a vestibular schwannoma (VS). Furthermore, it is often not possible to visualize normal VII-VIII nerves by DTT (visualization rates were 12.5-63.6%). Therefore, DTT post-processing was optimized for normal VII-VIII nerve visualization with and without manual noise elimination.METHODS: DTT examinations of ten patients were evaluated to assess the improvement in performance by modifying seed region of interest (ROI) and fractional anisotropy (FA) threshold. Seed ROI was placed at the porus of the internal auditory meatus, and FA threshold values were either fixed or variable for each patient. DTT visualization of cranial nerves VII-VIII was evaluated and the noise effect was measured.RESULTS: Cranial nerves VII-VIII were visualized in 90% of patients without using manual noise elimination by modifying the seed ROI and FA threshold. The visualization rate with FA threshold of the upper limit in each patient (100%) was significantly higher than that with FA threshold of 0.1 (75%) (p = 0.02). The incidence rate of noise with FA threshold of the upper limit (10%) was not significantly different than the FA threshold of 0.1 (20%) (p = 0.66).CONCLUSION: Seed ROI modification and FA thresholding can improve the visualization of cranial nerve VII-VIII locations in DTT. This technique is promising for its potential to determine the relationship of cranial nerves VII-VIII to VS.

Resumo Limpo

rpose diffus tensor tractographi dtt adequ reliabl predict facial vestibulocochlear viiviii nerv locat especi relat vestibular schwannoma vs furthermor often possibl visual normal viiviii nerv dtt visual rate therefor dtt postprocess optim normal viiviii nerv visual without manual nois eliminationmethod dtt examin ten patient evalu assess improv perform modifi seed region interest roi fraction anisotropi fa threshold seed roi place porus intern auditori meatus fa threshold valu either fix variabl patient dtt visual cranial nerv viiviii evalu nois effect measuredresult cranial nerv viiviii visual patient without use manual nois elimin modifi seed roi fa threshold visual rate fa threshold upper limit patient signific higher fa threshold p incid rate nois fa threshold upper limit signific differ fa threshold p conclus seed roi modif fa threshold can improv visual cranial nerv viiviii locat dtt techniqu promis potenti determin relationship cranial nerv viiviii vs

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