- Bone-Subtracted Spinal CT Angiography Using Nonrigid Registration for Better Visualization of Arterial Feeders in Spinal Arteriovenous Fistulas
CTA images of the arterial and late arterial phases were used to obtain warped images of the late arterial phase by nonrigid registration that was adjusted to the arterial phase images. R-CTA images were then obtained by subtracting the warped images from the arterial phase images. R-CTA had a higher accuracy compared with conventional spinal CTA (80% versus 47%). The authors conclude that subtracted CTA imaging using nonrigid registration detects feeders of spinal arteriovenous fistulas more accurately and quickly than conventional CTA.
- Clinical and Imaging Follow-Up of Patients with Coiled Basilar Tip Aneurysms Up to 20 Years
Clinical follow-up of 144 of 154 patients who survived the admission period (January 1995–August 2006) was for a mean of 9.8 years. Aneurysm size of 15 mm was the most important independent predictor for retreatment. Nine rebleeds occurred in 106 patients who initially presented with SAH after a median follow-up of 8.3 years. Eight patients died of aneurysm-related adverse events: 3 of rebleed and 5 of progressive mass effect. Life-long MRA follow-up at yearly intervals is recommended.
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