title: Reproducibility of volumetric intravascular ultrasound radiofrequency-based analysis of coronary plaque composition in vivo.
abstract: Intravascular ultrasound radiofrequency (RF-IVUS) data permit the analysis of coronary plaque composition in vivo and is used as an endpoint of ongoing pharmacological intervention trials. We assessed the reproducibility of volumetric RF-IVUS analyses in mild-to-moderately diseased atherosclerotic human coronary arteries in vivo. A total of 9,212 IVUS analyses on cross-sectional IVUS frames was performed to evaluate the reproducibility of volumetric RF-IVUS measurements in 33 coronary segments with a length of 27 +/- 7 mm. For vessel, lumen, and plaque + media volume the relative measurement differences (P = NS for all) were (A = intraobserver comparison, same pullback) -0.40 +/- 1.0%; -0.48 +/- 1.4%; -0.35 +/- 1.6%, (B = intraobserver comparison, repeated pullback) -0.42 +/- 1.2%; -0.52 +/- 1.8%; -0.43 +/- 4.5% (C = interobserver comparison, same pullback) 0.71 +/- 1.8%; 0.71 +/- 2.2%, and 0.89 +/- 5.0%, respectively. For fibrous, fibro-lipidic, calcium, and necrotic-core volumes the relative measurement differences (P = NS for all) were (A) 0.45 +/- 2.1%; -1.12 +/- 4.9%; -0.84 +/- 2.1%; -0.22 +/- 1.8%, (B) 1.40 +/- 4.1%; 1.26 +/- 6.7%; 2.66 +/- 7.4%; 0.85 +/- 4.4%, and (C) -1.60 +/- 4.9%; 3.85 +/- 8.2%; 1.66 +/- 7.5%, and -1.58 +/- 4.7%, respectively. Of note, necrotic-core volume showed on average the lowest measurement variability. Thus, in mild-to-moderate atherosclerotic coronary artery disease the reproducibility of volumetric compositional RF-IVUS measurements from the same pullback is relatively high, but lower than the reproducibility of geometrical IVUS measurements. Measurements from repeated pullbacks and by different observers show acceptable reproducibilities; the volumetric measurement of the necrotic-core shows on average the highest reproducibility of the compositional RF-IVUS measurements.
authors.affiliation: Department of Cardiology, Thoraxcentrum Twente, Medisch Spectrum Twente, Haaksbergerstraat 55, Enschede, 7513ER, The Netherlands.
authors.forename: Marc
authors.initials: M
authors.lastname: Hartmann
authors.forename: Eline S K
authors.initials: ES
authors.lastname: Mattern
authors.forename: Jennifer
authors.initials: J
authors.lastname: Huisman
authors.forename: Gert K
authors.initials: GK
authors.lastname: van Houwelingen
authors.forename: Frits H A F
authors.initials: FH
authors.lastname: de Man
authors.forename: Martin G
authors.initials: MG
authors.lastname: Stoel
authors.forename: Peter W
authors.initials: PW
authors.lastname: Danse
authors.forename: Hans W
authors.initials: HW
authors.lastname: Louwerenburg
authors.forename: Clemens
authors.initials: C
authors.lastname: von Birgelen
mesh_terms: D000704:Analysis of Variance; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D018084:Ultrasonography, Interventional / Q000379:methods*