[4, 6] In this study, we report our experience of using MRA in the detection of Az and associated aneurysms in our institute. To our knowledge, this is one of the largest MRA investigations to date relating to the Az and associated aneurysms.
Between January 2008 and March 2011, MRA was performed in a total of 3,572 consecutive hospitalized patients (1,897 male, 1,675 female) aged 8-100 years (mean age, 61.99 ± 15.26 years) in our hospital (the Sixth Affiliated https://www.selleckchem.com/products/Lapatinib-Ditosylate.html People’s Hospital, Shanghai Jiao Tong University). The study protocol was reviewed and approved by the Institutional Review Board. Informed consent for study participation was provided by patients or their immediate family members (if the patient’s clinical status precluded him or her from granting consent). We established a database where all MRA data focusing on intracranial vessels and the main clinical information of the patients were recorded and stored. Through the database, we could easily screen and categorize the MRA data using different search key words. All MRA examinations were performed on a 3.0 T system (Achieva X-Series, Philips Medical Systems, Amsterdam, The Netherlands) with a Sense-Head-8
receiver head coil. The 3-D-T1-fast field sequences were used to obtain time-of-flight (TOF)-MRA images; the detailed parameters of the sequences have been described in our previous paper.[7] The acquired image datasets were then transferred to a workstation (EWS 2.5.3.0, Philips Medical Systems), where 3-dimensional (3-D) image Selleckchem Venetoclax reconstruction was rendered with VR by use of a 3-D specialist software package (Volume Inspection, Philips Medical Systems). During VR postprocessing, the posterior circulation system was removed by using the single artery highlighting method to reduce artery overlay and highlight the anterior circulation. With an arbitrary rotation, the VR MRA images were allowed to render a comprehensive vision of the anterior circulation system. The merits afforded by VR MRA make it a useful tool for identifying an Az from other ACA anomalies, especially bihemispheric www.selleck.co.jp/products/atezolizumab.html ACA. Two experienced observers (M.H.L and H.Q.T), both blind to all clinical
information and independent of each other, interpreted all 3-D-TOF-MRA datasets on an offline workstation, where all MRA images, including source images, maximum intensity projection and VR images, were displayed on screen. The observers were allowed to adjust the appropriate threshold of window width and level and rotate the VR images arbitrarily for comprehensive visualization. Interobserver disagreements were resolved by consensus in a joint session. The presence of an Az was identified according to the same criteria described in previously published literatures.[1-4] If associated aneurysms were present, their size, location, shape, and clinical information were recorded in detail. The descriptive statistics analysis was performed by use of SPSS (version 13.0, SPSS Inc., Chicago, IL, USA).