title: Factors that influence measurements and accurate evaluation of stent apposition by optical coherence tomography. Assessment using a phantom model.
abstract: BACKGROUND
  Factors influencing measurements and accurate evaluation of stent apposition by optical coherence tomography (OCT) are not established.
  
  
  RESULTS
  Phantom models of known luminal sizes and lengths were evaluated by OCT under various conditions and measurements were compared with actual values. Stents implanted into phantom models were examined by OCT to validate the measurement point on the stent strut surface for accurate evaluation of stent apposition. Strut thickness was measured at 3 points (midpoint, inner and outer surfaces of the stent shadow). The precision of OCT measurements of lumen diameter and area was satisfactory when the image wire was positioned in the center, but the error and deviation were unsatisfactory when the image wire was positioned eccentrically using a low frame acquisition rate. Longitudinal OCT measurements were close to actual values under all conditions examined. Measurements from the midpoint of the stent shadow to the adjacent vessel wall surface coincided with actual stent thickness.
  
  
  CONCLUSIONS
  Significant measurement error can occur if the image wire is positioned eccentrically with a lower frame acquisition rate than specified by the manufacturer. To accurately evaluate stent apposition, the stent surface should be measured from the center of the stent reflection.
authors: Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine, Japan.
authors: Takahiro
authors: T
authors: Sawada
authors: Junya
authors: J
authors: Shite
authors: Noriyuki
authors: N
authors: Negi
authors: Toshiro
authors: T
authors: Shinke
authors: Yusuke
authors: Y
authors: Tanino
authors: Daisuke
authors: D
authors: Ogasawara
authors: Hiroyuki
authors: H
authors: Kawamori
authors: Hiroki
authors: H
authors: Kato
authors: Naoki
authors: N
authors: Miyoshi
authors: Naoki
authors: N
authors: Yoshino
authors: Amane
authors: A
authors: Kozuki
authors: Masanobu
authors: M
authors: Koto
authors: Ken-ichi
authors: K
authors: Hirata
mesh_terms: D015906:Angioplasty, Balloon, Coronary / Q000295:instrumentation*; D016477:Artifacts; D003331:Coronary Vessels / Q000033:anatomy & histology*; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D015607:Stents; D041623:Tomography, Optical Coherence / Q000295:instrumentation*