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Visualization of Intraaneurysmal Flow Patterns with Transluminal Flow Images of 3D MR Angiograms in Conjunction with Aneurysmal Configurations

Toru Satoha, Keisuke Onodab and Shoji Tsuchimotob

a Department of Neurological Surgery, Ryofukai Satoh Neurosurgical Hospital, Hiroshima, Japan
b Department of Neurological Surgery, Onomichi Municipal Hospital, Hiroshima, Japan



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  		FIG 1. Schematic illustration of selective opacity curves used in the opacity chart of MR signal intensities: increasing curve for the conventional parallel volume-rendered imaging (top), spiked peak curve for transluminal imaging (middle), and spiked peak curve with a stepwise square curve for transluminal flow imaging (bottom). Serial observation of transluminal flow images represents the intraaneurysmal flow patterns by superimposing stepwise extracted intraluminal volume data, with signal intensities ranging 350–500, 320–500, 290–500, 260–500, 230–500, and 200–500, respectively, onto the corresponding transluminal images with aneurysmal configurations.




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  		FIG 2. Case 1. 75-year-old woman with an unruptured left internal carotid-posterior communicating artery aneurysm.

A and B, Three-dimensional volume-rendered CT and MR angiograms, respectively, superoinferior projection.

C and D, magnified images of CT and MR angiograms, respectively, left lateral projection.

E and F, Maximum intensity projection images of CT and MR angiograms, respectively. Figure 2 continues.

Figure 2 continued. G–L, Transluminal flow images of 3D MR angiogram with stepwise intraluminal contents, with signal intensities ranging 350–500, 320–500, 290–500, 260–500, and 200–500, respectively, demonstrate blood flow as the three-dimensional distribution of signal intensities.




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  		FIG 3. Case 2. 66-year-old man with an unruptured left internal carotid-posterior communicating artery aneurysm.

A and B, Magnified volume-rendered CT and MR angiograms, respectively, right lateral projection.

C and D, Maximum intensity projection images of CT and MR angiograms, respectively. E and F, Digital subtraction angiograms, lateral projection, obtained in the early and late arterial phases, respectively. Figure 3 continues.

Figure 3 continued. G–L, Transluminal flow images of 3D MR angiogram with stepwise intraluminal contents, with signal intensities ranging 350–500, 320–500, 290–500, 260–500, 230–350, and 200–500, respectively.



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  		FIG 4. Case 3. 63-year-old woman with an unruptured left internal carotid-ophthalmic artery aneurysm.

A, Magnified volume-rendered MR angiogram and B, coordinated maximum intensity projection image, anteroposterior projection.

C–F, Transluminal flow images of 3D MR angiogram with stepwise intraluminal contents, with signal intensities ranging 350–500, 320–500, 290–350, and 260–500, respectively.





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X