Intracranial aneurysms: endovascular evaluation with three-dimensional-display MR angiography.

Bontozoglou, Nikos; Spanos, H; Lasjaunias, P.; Zarifis, G.

doi:10.1148/radiology.197.3.7480772

Cited by 17 publications

(2 citation statements)

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“…Use of a low opacity can result in the creation of transparent objects (eg, it is possible to make intracranial arteries visible beneath a layer of skull bone) (Fig 8). Selecting only a small group of voxels with a high opacity allows creation of a "virtual endoscopic" view in which the thin layer of voxels resembles the vessel wall (Fig 8e) (30).…”

Section: Threshold-dependent Methods For 3d Visualizationmentioning

confidence: 99%

CT Angiography of Intracranial Aneurysms: A Focus on Postprocessing

Tomandl¹,

Köstner²,

Schempershofe³

et al. 2004

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110

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Computed tomographic (CT) angiography is a well-known tool for detection of intracranial aneurysms and the planning of therapeutic intervention. Despite a wealth of existing studies and an increase in image quality due to use of multisection CT and increasingly sophisticated postprocessing tools such as direct volume rendering, CT angiography has still not replaced digital subtraction angiography as the standard of reference for detection of intracranial aneurysms. One reason may be that CT angiography is still not a uniformly standardized method, particularly with regard to image postprocessing. Several methods for two- and three-dimensional visualization can be used: multiplanar reformation, maximum intensity projection, shaded surface display, and direct volume rendering. Pitfalls of CT angiography include lack of visibility of small arteries, difficulty differentiating the infundibular dilatation at the origin of an artery from an aneurysm, the kissing vessel artifact, demonstration of venous structures that can simulate aneurysms, inability to identify thrombosis and calcification on three-dimensional images, and beam hardening artifacts produced by aneurysm clips. Finally, an algorithm for the safe and useful application of CT angiography in patients with subarachnoid hemorrhage has been developed, which takes into account the varying quality of equipment and software at different imaging centers.

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Section: Threshold-dependent Methods For 3d Visualizationmentioning

confidence: 99%

CT Angiography of Intracranial Aneurysms: A Focus on Postprocessing

Tomandl¹,

Köstner²,

Schempershofe³

et al. 2004

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110

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“…The use of intravascular virtual MR endoscopy for the evaluation of intracranial aneurysms is quite rare. İn a different study, Bontozoglou et al (3,4) described the size of the aneurysmal sac and its orifice using 3D endovascular MR angiography via an orthographic rendering method. As far as we know, only Shigematsu et al (20) described the use of intravascular virtual MR endoscopy …”

Section: Incesu L Et Al: Mr Endoscopy In Cerebral Aneurysmsmentioning

confidence: 99%

Intravascular virtual MR endoscopy evaluation of cerebral aneurysms

İncesu

Aslan²,

Polat³

et al. 2013

Turkish Neurosurgery

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AIm:The aim of this study was to evaluate the role of intravascular virtual MR endoscopy in the planning of correct surgical clipping of the aneurysm neck. mATeRIAL and meTHods: A total of 36 aneurysms were detected by using magnetic resonance angiography (MRA) in thirty patients. Intravascular virtual MR endoscopy is a realistic 3-dimensional simulation of intravascular structures that is generated by postprocessing of MRA maximum-intensity projection images. The images were evaluated by two neuroradiologists, in terms of image quality via qualitative analysis of MRA and intravascular virtual MR endoscopy of the orifice of the aneurysm neck, as well as the relationship of the main and bifurcating arteries with the orifice of the aneurysm. The readers were fully blinded. Mann-Whitney U test was used to compare the differences in mean scores for each reader between these two groups.ResuLTs: Based on the scoring system, evaluating image quality using qualitative analysis, both readers found the mean scores to be 3.82 ± 0.52 and 3.91 ± 0.72 for intravascular virtual MR endoscopy, and 2.97 ± 0.71 and 2.89 ± 0.83 for MRA, which was statistically different (p<0.001).CoNCLusIoN: Intravascular virtual MR endoscopy may provide useful knowledge in the proper the surgical clipping of the aneurysm neck.KeywoRds: Cerebral aneurysm, Intravascular virtual MR endoscopy, Magnetic resonance angiography ÖZ AmAÇ: Bu çalışmanın amacı, anevrizma boynunun doğru cerrahi kliplenmesinin planlanmasında intravasküler sanal MR endoskopinin rolünü değerlendirmektir. yÖNTem ve GeReÇLeR: 30 hastada 36 anevrizma magnetik rezonans anjiyografi (MRA) kullanılarak ortaya çıkarıldı. İntravasküler sanal MR endoskopi, MRA maximum-intensity projeksiyon görüntülemenin işlenmesinden üretilen intravasküler yapıların gerçekçi 3 boyutlu simülasyonudur. İki nöroradyolog tarafından MRA ve intravasküler sanal MR endoskopide anevrizma boynunun orifisi ve anevrizmanın orifisi ile bifurkasyon arter ve ana arterin ilişkisi kalitatif analiz vasıtasıyla görüntü kalitesi açısından değerlendirildi. İki okuyucu tamamen bağımsızdı. Bu iki grup arasındaki her bir okuyucu için ortalama puan farkının anlamlılığına Mann-Whitney testi ile karşılaştırıldı.BuLGuLAR: Kalitatif analiz kullanılarak görüntü kalitesini puanlama sistemine göre değerlendirilmesinde her iki okuyucu intravasküler sanal MR endoskopi için 3.82 ± 0.52 ve 3.91 ± 0.72; MRA için 2.97 ± 0.71 ve 2.89 ± 0.83 ortalama skora sahipti ve bu fark istatistiksel olarak anlamlıydı (p<0.001).soNuÇ: İntravasküler sanal MR endoskopi anevrizma boynunun uygun cerrahi kliplenmesinde faydalı bilgi sağlayabilir.ANAHTAR sÖZCÜKLeR: Serebral anevrizma, İntravasküler sanal MR endoskopi, Magnetik rezonans anjiyografi

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Multiresolution, model‐based segmentation of MR angiograms

Summers¹,

Bhalerao²,

Hawkes³

1997

Magnetic Resonance Imaging

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During the last decade, the quality of MR angiograms has risen substantially and their clinical utility has been demonstrated progressively. This acceptance has created a need for tools with which to summarize and display the information available. We have used a model-based segmentation technique to extract vascular morphology and local flow parameters from phase contrast MR angiograms. A multiresolution data structure is used as the basis of recursive decision-making to identify regions of blood flow. The resulting data representation allows more efficient data handling in subsequent processing and visualization and is directly applicable to the creation of a connected graph model of vascular regions. We describe this flow feature extraction algorithm and demonstrate the utility of the results.

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Intracranial aneurysms: endovascular evaluation with three-dimensional-display MR angiography.

Cited by 17 publications

References 0 publications

CT Angiography of Intracranial Aneurysms: A Focus on Postprocessing

CT Angiography of Intracranial Aneurysms: A Focus on Postprocessing

Intravascular virtual MR endoscopy evaluation of cerebral aneurysms

Multiresolution, model‐based segmentation of MR angiograms

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