title: The lognormal perfusion model for disruption replenishment measurements of blood flow: in vivo validation.
abstract: Dynamic contrast enhanced ultrasound (DCE-US) is evolving as a promising tool to noninvasively quantify relative tissue perfusion in organs and solid tumours. Quantification using the method of disruption replenishment is best performed using a model that accurately describes the replenishment of microbubble contrast agents through the ultrasound imaging plane. In this study, the lognormal perfusion model was validated using an exposed in vivo rabbit kidney model. Compared against an implanted transit time flow meter, longitudinal relative flow measurement was (×3) less variable and correlated better when quantification was performed with the lognormal perfusion model (Spearman r = 0.90, 95% confidence interval [CI] = 0.05) vs. the prevailing mono-exponential model (Spearman r = 0.54, 95% CI = 0.18). Disruption-replenishment measurements using the lognormal perfusion model were reproducible in vivo to within 12%.
authors.affiliation: Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada. hudsonjm@gmail.com
authors.forename: John M
authors.initials: JM
authors.lastname: Hudson
authors.forename: Kogee
authors.initials: K
authors.lastname: Leung
authors.forename: Peter N
authors.initials: PN
authors.lastname: Burns
mesh_terms: D000465:Algorithms; D000818:Animals; D001783:Blood Flow Velocity / Q000502:physiology*; D001810:Blood Volume; D003287:Contrast Media / Q000493:pharmacokinetics*; D004195:Disease Models, Animal; D005466:Fluorocarbons / Q000493:pharmacokinetics*; D018056:Hemorheology; D007668:Kidney / Q000098:blood supply* / Q000000981:diagnostic imaging*; D016018:Least-Squares Analysis; D011817:Rabbits; D012078:Renal Artery Obstruction / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D015203:Reproducibility of Results; D018709:Statistics, Nonparametric; D014463:Ultrasonography
chemical_list: D003287:Contrast Media; D005466:Fluorocarbons; C042852:perflutren