CT angiography for assessment of intracranial basilar apex aneurysm neck diameter reduction poststenting for treatment planning

2010 ◽  
pp. NA-NA
Author(s):  
Joseph G. Adel ◽  
Arun K. Sherma ◽  
Bernard R. Bendok
Keyword(s):  
Treatment Planning ◽  
Ct Angiography ◽  
Aneurysm Neck ◽  
Neck Diameter ◽  
Diameter Reduction

Cerebral aneurysm neck diameter is an independent predictor of progressive occlusion after stent-assisted coiling

2017 ◽  
Vol 159 (7) ◽  
pp. 1313-1319 ◽  
Author(s):  
Masahito Nakazaki ◽  
Tadashi Nonaka ◽  
Tatsufumi Nomura ◽  
Toshiyuki Onda ◽  
Yasuyuki Yonemasu ◽  
...  
Keyword(s):  
Cerebral Aneurysm ◽  
Independent Predictor ◽  
Aneurysm Neck ◽  
Progressive Occlusion ◽  
Neck Diameter

Aneurysms of the posterior circulation: detection and treatment planning using volume-rendered three-dimensional helical computerized tomography angiography

2005 ◽  
Vol 103 (6) ◽  
pp. 1018-1029 ◽  
Author(s):  
J. Pablo Villablanca ◽  
Adina Achiriolaie ◽  
Parizad Hooshi ◽  
Neil Martin ◽  
Gary Duckwiler ◽  
...  
Keyword(s):  
Treatment Planning ◽  
Ct Angiography ◽  
Computerized Tomography ◽  
Treatment Options ◽  
Significant Proportion ◽  
Posterior Circulation ◽  
Content Type ◽  
Computerized Tomography Angiography ◽  
Posterior Circulation Aneurysms ◽  
Fine Print

Object. The aim of this study was to determine whether computerized tomography (CT) angiography could be used to identify and characterize aneurysms of the posterior circulation and guide optimal treatment selection, and how data obtained using this method compared with intraoperative findings. Methods. Patients suspected of harboring brain aneurysms underwent CT angiography and digital subtraction (DS) angiography; the results were prospectively interpreted by blinded independent evaluators. All patients with posterior circulation aneurysms were consecutively enrolled in the study. After treatment, neurosurgeons and endovascular therapists evaluated the ability of CT and DS angiography to demonstrate features of the lesions important for triage between treatment options (Wilcoxon signed-rank test) and to allow for coil or clip preselection and complete treatment planning (McNemar test of proportions), while using intraoperative findings as the basis of truth. In 242 patients overall, CT angiography detected 38 aneurysms and two aneurysmal blisters in 32 patients. The sensitivity of CT angiography in revealing posterior circulation aneurysms was 100% compared with DS angiography, with no false-positive results. Furthermore, CT angiography was sufficient as the sole study at triage for 65% of the posterior circulation aneurysms (26 of 40 lesions; p < 0.001), including 62% of the complex lesions (p < 0.001), and permitted coil or clip preselection in 74% of treated cases (20 of 27 cases; p < 0.002). Results of CT angiography revealed information about mural calcification and intraluminal thrombus not available on DS angiography, which affected patient care. Conclusions. In this study population, CT angiography was comparable to DS angiography in the detection and characterization of aneurysms of the posterior circulation. Computerized tomography angiography was used successfully to triage patients between endovascular and neurosurgical treatment options in a significant proportion of cases and permitted treatment planning in more than 70% of treated cases.

Progressive thrombosis of unruptured aneurysms after coil embolization: analysis of 255 consecutive aneurysms

2019 ◽  
Vol 11 (11) ◽  
pp. 1113-1117 ◽  
Author(s):  
Yusuke Funakoshi ◽  
Hirotoshi Imamura ◽  
Shoichi Tani ◽  
Hidemitsu Adachi ◽  
Ryu Fukumitsu ◽  
...  
Keyword(s):  
Contrast Agent ◽  
Digital Subtraction Angiography ◽  
Coil Embolization ◽  
Endovascular Procedure ◽  
Digital Subtraction ◽  
Unruptured Aneurysms ◽  
Aneurysm Neck ◽  
Complete Obliteration ◽  
Neck Diameter

IntroductionWe have observed that aneurysms treated by insufficient coil embolization and filled with contrast agent immediately after the procedure are often completely occluded at follow-up. However, there are limited studies showing progressive thrombosis of aneurysms after coil embolization. Herein, we describe our experience with coil embolization for aneurysms, and discuss the factors involved in progressive thrombosis.MethodsA total of 255 aneurysms treated by coil embolization in our institute between January 2011 and June 2017 and observed >6 months were included. ‘Progressive thrombosis’ indicated that aneurysms that were neck remnant (NR) or dome filling (DF) immediately after coil embolization changed to complete obliteration (CO) at the 6-month follow-up digital subtraction angiography. The factors involved in progressive thrombosis were assessed.ResultsIn all aneurysms (n=255), 24 (9.4%) were CO, 82 (32.2%) were NR, and 149 (58.4%) were DF immediately after the procedure. At 6-month digital subtraction angiography, 123 (48.2%) were CO, 95 (37.3%) were NR, and 37 (14.5%) were DF. Retreatment for major recanalization was performed in eight cases (3.1%). One hundred and three aneurysms showed progressive thrombosis. There were significant differences in aneurysm location (P=0.0002), aneurysm dome diameter (P=0.0015), aneurysm neck diameter (P=0.0068), volume embolization ratio (P=0.0054), and endovascular procedure with stent (P=0.0264) between the progressive thrombosis and no thrombosis groups.ConclusionsProgressive thrombosis can occur in aneurysms after coil embolization depending on aneurysm location and size, and stent use. Thus, the degree of coil embolization and combination with a stent should be adjusted depending on aneurysm type.

Follow-Up of Aneurysm Neck Diameter after Endovascular Repair of Abdominal Aortic Aneurysms

2008 ◽  
Vol 22 (4) ◽  
pp. 559-563 ◽  
Author(s):  
Alberto Bravo Soberón ◽  
Milagros Martí de Garcia ◽  
Gonzalo Garzón Möll ◽  
Beatriz Rodríguez Vigil ◽  
María Allona Krauel ◽  
...  
Keyword(s):  
Endovascular Repair ◽  
Abdominal Aortic Aneurysms ◽  
Aortic Aneurysms ◽  
Aneurysm Neck ◽  
Abdominal Aortic ◽  
Neck Diameter

Three-dimensional helical computerized tomography angiography in the diagnosis, characterization, and management of middle cerebral artery aneurysms: comparison with conventional angiography and intraoperative findings

2002 ◽  
Vol 97 (6) ◽  
pp. 1322-1332 ◽  
Author(s):  
J. Pablo Villablanca ◽  
Parizad Hooshi ◽  
Neil Martin ◽  
Reza Jahan ◽  
Gary Duckwiler ◽  
...  
Keyword(s):  
Middle Cerebral Artery ◽  
Treatment Planning ◽  
Ct Angiography ◽  
Computerized Tomography ◽  
Cerebral Artery ◽  
Three Dimensional ◽  
Content Type ◽  
Computerized Tomography Angiography ◽  
Fine Print

Object. Middle cerebral artery (MCA) aneurysms can be difficult to detect and characterize. The authors describe the utility and impact of helical computerized tomography (CT) angiography for the evaluation of aneurysms in this location, and compare this modality with digital subtraction (DS) angiography and intraoperative findings. Methods. Two hundred fifty-one patients with suspected cerebral aneurysms underwent CT angiography. Two-dimensional multiplanar reformatted images and three-dimensional CT angiograms were examined by two independent readers in a blinded fashion. Results were compared with findings on DS angiograms to determine the relative efficacy of these modalities in the detection and characterization of aneurysms. Questionnaires completed by neurosurgeons and endovascular therapists were used to determine the impact of CT angiograms on aneurysm management. Twenty-eight patients harboring 31 MCA aneurysms and 26 patients without aneurysms were identified using CT angiography. The sensitivity of CT angiography and DS angiography for MCA aneurysms was 97%; both techniques showed 100% specificity. In 76% of evaluations, the CT angiography studies provided information not available on DS angiography examinations. For the characterization of aneurysms, CT angiography was rated superior (72%) or equal (20%) to DS angiography in 92% of cases evaluated (p < 0.001). Computerized tomography angiography was evaluated as the only study needed for patient triage in 82% of cases (p < 0.001), and as the only study needed for treatment planning in 89% of surgically treated (p < 0.001) and in 63% of endovascularly treated cases (p < 0.001). The information acquired on CT angiograms changed the initial treatment plan in 24 (67%) of these 36 complex lesions (p < 0.01). The aneurysm appearance intraoperatively was identical or nearly identical to that seen on CT angiograms in 17 (89%) of 19 of the surgically treated cases. Conclusions. Computerized tomography angiography has unique advantages over DS angiography and is a viable alternative to the latter modality in the diagnosis, triage, and treatment planning in patients with MCA aneurysms.

scholarly journals Capabilities and Limitations of Fire-Shaping to Produce Glass Nozzles

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5477
Author(s):  
Alejandro Rubio ◽  
Sergio Rodríguez ◽  
Maria G. Cabezas
Keyword(s):  
Polished Glass ◽  
Nozzle Length ◽  
Gas Dynamic ◽  
Produce Glass ◽  
Nozzle Shape ◽  
Inner Diameter ◽  
Different Shapes ◽  
Capillary Size ◽  
Neck Diameter ◽  
Diameter Reduction

Microfluidic devices for drop and emulsion production are often built using fire-shaped (or fire-polished) glass nozzles. These are usually fabricated manually with inexpensive equipment. The shape limitations and poor reproducibility are pointed as the main drawbacks. Here, we evaluate the capabilities of a new fire-shaping approach which fabricates the nozzle by heating a vertical rotating capillary at the Bottom of a Lateral Flame (BLF). We analyze the effect of the heating conditions, and the capillary size and tolerances. The shape reproducibility is excellent for nozzles of the same size produced with the same conditions. However, the size reproducibility is limited and does not seem to be significantly affected by the heating conditions. Specifically, the minimum neck diameter standard deviation is 3%. Different shapes can be obtained by changing the heating position or the capillary dimensions, though, for a given diameter reduction, there is a minimum nozzle length due to the overturning of the surface. The use of thinner (wall or inner diameter) capillaries allows producing much shorter nozzles but hinders the size reproducibility. Finally, we showed an example of how the performance of a microfluidic device is affected by the nozzle shape: a Gas Dynamic Virtual Nozzle (GDVN) built with a higher convergent rate nozzle works over a wider parametric range without whipping.

scholarly journals Evaluation of 64-Section CT Angiography for Detection and Treatment Planning of Intracranial Aneurysms by Using DSA and Surgical Findings

Radiology ◽  
2009 ◽  
Vol 252 (3) ◽  
pp. 808-815 ◽  
Author(s):  
Qi Li ◽  
Fajin Lv ◽  
Yongmei Li ◽  
Tianyou Luo ◽  
Kewei Li ◽  
...  
Keyword(s):  
Treatment Planning ◽  
Ct Angiography ◽  
Intracranial Aneurysms
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