title: The accuracy of length measurements using different intravascular ultrasound motorized transducer pullback systems.
abstract: Accurate length measurements by intravascular ultrasound (IVUS) are necessary for stent length selection and for IVUS volumetric analysis. The comparative accuracy of commercially available transducer pullback systems--a necessity for accurate IVUS length and volume measurements--has never been studied. We evaluated the accuracy of four IVUS pullback systems by studying 180 patients (45 in each group) who had been treated with a single stent of known length. Stented lesions were located in the left anterior descending artery (n = 77), left circumflex artery (n = 41), right coronary artery (n = 41), left main (n = 2), and saphenous vein grafts (n = 19). The known lengths of implanted stents ranged from 8 to 33 mm. The correlations between known stent length and IVUS-measured stent length in each group were 0.92 for CVIS, 0.83 for BSC Galaxy, 0.63 for Endosonics TrackBack, and 0.69 for Volcano Model R-l00 research pullback device, respectively. Furthermore, the absolute value of the difference between the two measurements was 9.1 +/- 13.1%, 8.8 +/- 10.2%, 18.6 +/- 21.5%, and 17.5 +/- 31.4%, respectively. With the Volcano Model R-l00 research pullback device, there were 3 extreme outliers; if these three outliers were excluded, then the correlation improved from 0.69 to 0.91; and the absolute deviation from known stent length improved from 17.5 +/- 31.4% to 9.7 +/- 8.3%. Thus, there is a significant variation in length measurement accuracy among IVUS pullback devices. This should be taken into account both clinically and when planning scientific studies.
authors: Clinical Medicine, Intravascular Imaging and Physiology Core Laboratory, Cardiovascular Research Foundation, Columbia University Medical Center, 55 East 59th Street, 6th Floor, New York, NY, USA.
authors: Kaoru
authors: K
authors: Tanaka
authors: Stéphane G
authors: SG
authors: Carlier
authors: Gary S
authors: GS
authors: Mintz
authors: Koichi
authors: K
authors: Sano
authors: Xuebo
authors: X
authors: Liu
authors: Kenichi
authors: K
authors: Fujii
authors: Jose
authors: J
authors: de Ribamar Costa
authors: Joanna
authors: J
authors: Lui
authors: Jeffrey W
authors: JW
authors: Moses
authors: Gregg W
authors: GW
authors: Stone
authors: Martin B
authors: MB
authors: Leon
mesh_terms: D000368:Aged; D000704:Analysis of Variance; D019917:Blood Vessel Prosthesis Implantation / Q000379:methods*; D016009:Chi-Square Distribution; D023921:Coronary Stenosis / Q000000981:diagnostic imaging* / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015607:Stents; D014159:Transducers; D018084:Ultrasonography, Interventional / Q000295:instrumentation*