title: The random walk function in the analysis of time-activity curves from dynamic radionuclide studies.
abstract: The random walk function is a mathematical function derived from studies of the mass transport and flow of diffusible materials through tubes. Approximations to the function were first used some time ago in the field of cardiac tracer dilution curves, but in the absence of rapid and reproducible curve fitting the method never became commonplace. The current study uses the latest curve-fitting techniques and shows how the method may be used with precision in the analysis of time-activity curves from dynamic oesophageal and blood flow studies. The physiological basis of the method is given and parameters obtained which relate to both the rate of flow and the local dispersion of the bolus.
authors: Department of Medical Physics, Bradford Royal Infirmary, UK.
authors: G C
authors: GC
authors: Hart
authors: B
authors: B
authors: Bunday
authors: V
authors: V
authors: Kiri
mesh_terms: D004947:Esophagus / Q000000981:diagnostic imaging; D006801:Humans; D008433:Mathematics; D011877:Radionuclide Imaging; D012039:Regional Blood Flow; D013269:Stochastic Processes; D013997:Time Factors