ABSTRACT
Objective To investigate the suboccipitalretrosigmoidapproach-relatedanatomy for cranial nerve microvascular decompression, so as to provide clinical anatomical data for microvascular decompression. Methods Eight adult cadaveric heads were fixed in 10% formalin and purfused with emulsion, and then were used to simulate the operation approach. Dissections were performed gradually; the anatomy variations and neurovascular travelling, especially the upper/middle/lower neurovascular complex in cerebellopontine angle (CPA) region, were observed and measured. Results The distance between the site of trigeminal nerve going into the brain stem to the meeting point of the transverse and sigmoid sinuseswas (4. 4±0. 2) cm; the distance between facial nerve going out of the brain stem to the meeting point of the transverse and sigmoid sinuses was (4. 1±0.2) cm. The distance from midpoint of horizontal fissure of the cerebellum to anterior bone wall (the width of the CPA cistern) was (0. 2±0. 1) cm and the height of flocculus was (0. 3±0. 1) cm. Conclusion It is of great significance for clinical surgery to, via the suboccipitalretrosigmoid approach, dissect the neurovascular tissues in CPA, with focus on the relationship between important neural and vascular tissues, including the bone window, petrosll veins, and the upper/middle/lower neurovascular complex.
ABSTRACT
PROPELLER (periodically rotated overlapping parallel lines with enhanced reconstruction) is a new method of MRI data collection and reconstruction technique for reducing motion artifact. However, the minimum imaging time in PROPELLER is markedly longer than in conventional fast MRI. Through the current research of K-Space Undersampling algorithm based on PROPELLER technique, a proper undersampling method is conducted and then proved by simulation. The new data collection method can shorten the PROPELLER time without causing more image artifacts, which improves the value of PROPELLER technique.