RT Journal Article
SR Electronic
T1 Dangerous Advances in Measurements from Digital Subtraction Angiography: When Is a Millimeter Not a Millimeter?
JF American Journal of Neuroradiology
JO Am. J. Neuroradiol.
FD American Society of Neuroradiology
SP 459
OP 461
DO 10.3174/ajnr.A1381
VO 30
IS 3
A1 A.J. Fox
A1 J. Millar
A1 J. Raymond
A1 J.C. Pryor
A1 D. Roy
A1 G.A. Tomlinson
A1 J.P. McKay
A1 A.J. Molyneux
YR 2009
UL http://www.ajnr.org/content/30/3/459.abstract
AB SUMMARY: Aneurysms need accurate millimeters (mm). Direct millimeters were lost with digital subtraction angiography (DSA) years ago, with measurements in pixels. Advances in DSA can now give inherent millimeters. The Cerecyte aneurysm coiling trial's angiographic core lab assesses images from compact disc (CD). External fiducials for millimeter calibration are required. Of 25 cases with two 10 mm fiducials, near and far from the intensifier, the midline mean is between 9 “mm” to 15 “mm”. Yet 10 mm must be 10 mm. This variance is potentially dangerous. Proprietary software seems to prohibit calibration transfer via CD to another vendor's system.