The effects of renal variation upon measurements of perfusion and leakage volume in breast tumours

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Abstract

Dynamic contrast enhanced MRI (DCE-MRI) and pharmacokinetic models have been used to measure tumour permeability (K-trans) and leakage volume (v(e)) in numerous studies. The construction of pharmacokinetic models describing such tissue properties relies on defining the blood plasma concentration of contrast agent with respect to time (C-p(t)). When direct measurement is not possible a bi-exponential decay has been applied using data from healthy volunteers. This work investigates, by simulation, the magnitude of errors resulting from this definition with respect to normal variation in renal function and for cases with renal impairment. Errors up to 23% in v(e) and 28% in K-trans were found for the normal simulations, and 67% in v(e) and 61% in K-trans for the impaired simulations. If this bi-exponential curve is used as an input function to the generalized kinetic model and used in oncology, estimates of tissue permeability and leakage volume will possess large errors due to variation in C-p(t) curves between subjects.

Original languageEnglish
Pages (from-to)2041-2051
Number of pages10
JournalPhysics in Medicine and Biology
Volume49
Issue number10
DOIs
Publication statusPublished - May 2004

Keywords

  • BRAIN-BARRIER PERMEABILITY
  • CONTRAST AGENT UPTAKE
  • GD-DTPA ENHANCEMENT
  • TRACER KINETICS
  • DYNAMIC MRI
  • PARAMETERS
  • MODEL
  • PHARMACOKINETICS
  • INJECTION
  • CONSTANT

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