AJDRAJNR - American Journal of Neuroradiology

Published ahead of print on September 20, 2007
doi: 10.3174/ajnr.A0648
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Noninvasive Measurement of Intra-Aneurysmal Pressure and Flow Pattern Using Phase Contrast with Vastly Undersampled Isotropic Projection Imaging

R. Moftakhara, B. Aagaard-Kienitza,b, K. Johnsonc, P.A. Turskia,b, A.S. Turka,b, D.B. Niemanna,b, D. Consignyb, J. Grindeb, O. Wiebenb,c and C.A. Mistrettab,c

a Department of Neurosurgery, University of Wisconsin Hospital and Clinics, Madison, Wis
b Department of Radiology, University of Wisconsin Hospital and Clinics, Madison, Wis
c Medical Physics, University of Wisconsin Hospital and Clinics, Madison, Wis


Figure 1
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  		Fig 1. The 3 patterns of blood flow observed in the experimental aneurysms are illustrated: (A) recirculation pattern in bifurcation aneurysm, (B) jet pattern in bifurcation aneurysm, and (C) low flow pattern in sidewall aneurysm.


Figure 2
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  		Fig 2. A recirculation blood-flow pattern is observed in these experimental bifurcation aneurysms. A, PC-VIPR imaging demonstrates the recirculation blood flow pattern. B, The PC-VIPR pressure map demonstrates a relatively low neck-to-dome pressure differential with recirculation-type blood flow pattern.


Figure 3
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  		Fig 3. A jet blood-flow pattern is observed in a single case of bifurcation aneurysm. A, This bifurcation aneurysm demonstrates the jet blood-flow pattern with PC-VIPR imaging. B, The PC-VIPR pressure map of the aneurysm with the jet blood-flow pattern demonstrating the relatively high neck-to-dome pressure differential.


Figure 4
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  		Fig 4. In the sidewall aneurysms, a pattern of low blood flow is seen, resulting in an intermediate dome pressure gradient. A, The low flow pattern is demonstrated with PC-VIPR. B, PC-VIPR pressure map of the aneurysm with low flow pattern demonstrating a relatively intermediate neck-to-dome pressure differential.


Figure 5
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  		Fig 5. The linear Bland-Altman analysis demonstrates the high correlation between the PC-VIPR and catheter pressure measurements. The x-axis is the average of PC-VIPR and catheter pressure measurements, and the y-axis is the difference between the PC-VIPR and catheter pressure measurements.





Copyright © 2008 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X