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Cerebral Vasoreactivity: A Comparison of Color Velocity Imaging Quantification and Stable Xenon-Enhanced CT

S. S. Y. Ho1, W. W-m. Lam1, S. C. P. Ng2, M. K. Lam2, M. T. V. Chan3, W. S. Poon2 and C. Metreweli1

1 Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital, Ngan Shing St., Shatin, New Territories, Hong Kong.
2 Department of Surgery, Prince of Wales Hospital, Shatin, New Territories, Hong Kong.
3 Department of Anaesthesia and Intensive Care, Prince of Wales Hospital, Shatin, New Territories, Hong Kong.



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  		Fig. 1A. —77-year-old man with bilateral internal carotid artery stenoses and compromised cerebral vasoreactivity. Measurement of cerebral vasoreactivity on color velocity imaging quantification. Before administration of acetazolamide (A), baseline blood flow volume of right common carotid artery was 379.0 mL/min. After acetazolamide administration (B), respective flow value decreased to 300.0 mL/min, decrease of approximately 21%.

 


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  		Fig. 1B. —77-year-old man with bilateral internal carotid artery stenoses and compromised cerebral vasoreactivity. Measurement of cerebral vasoreactivity on color velocity imaging quantification. Before administration of acetazolamide (A), baseline blood flow volume of right common carotid artery was 379.0 mL/min. After acetazolamide administration (B), respective flow value decreased to 300.0 mL/min, decrease of approximately 21%.

 


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  		Fig. 1C. —77-year-old man with bilateral internal carotid artery stenoses and compromised cerebral vasoreactivity. Measurement of cerebral vasoreactivity on xenon CT. Before administration of acetazolamide (C), right hemispheric cerebral blood flow was 86.2 + 64.5 mL/100 g per minute = 150.7 mL/100 g per minute. After acetazolamide administration (D), respective hemispheric cerebral blood flow was 56.3 + 61.6 mL/100 g per minute = 117.9 mL/100 g per minute, a decrease of 22.0%.

 


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  		Fig. 1D. —77-year-old man with bilateral internal carotid artery stenoses and compromised cerebral vasoreactivity. Measurement of cerebral vasoreactivity on xenon CT. Before administration of acetazolamide (C), right hemispheric cerebral blood flow was 86.2 + 64.5 mL/100 g per minute = 150.7 mL/100 g per minute. After acetazolamide administration (D), respective hemispheric cerebral blood flow was 56.3 + 61.6 mL/100 g per minute = 117.9 mL/100 g per minute, a decrease of 22.0%.

 


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  		Fig. 2. —Agreement on cerebral vasoreactivity between color velocity imaging quantification (CVIQ) and stable xenon CT (XeCT). Solid line denotes mean difference in percentage of flow volume change between CVIQ and XeCT within 95% limit of agreement (dotted lines).

 

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