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Modeling tracer kinetics in dynamic Gd-DTPA MR imaging
1NMR Unit, Institute of Neurology, London, England.
Journal of Magnetic Resonance Imaging : JMRI
|January 1, 1997
Summary
This study compares three dynamic MRI models for analyzing gadolinium-diethylene-triamine penta-acetic acid (Gd-DTPA) data. The models assess plasma-to-extravascular extracellular space transfer, with K(ep) being the simplest parameter to measure.
Area of Science:
- Medical Imaging
- Biophysics
- Pharmacokinetics
Background:
- Dynamic contrast-enhanced MRI (DCE-MRI) with gadolinium-diethylene-triamine penta-acetic acid (Gd-DTPA) is crucial for analyzing tissue characteristics.
- Several mathematical models exist to interpret Gd-DTPA kinetic data, each with specific assumptions and parameter outputs.
Purpose of the Study:
- To examine and compare three prominent dynamic MRI models: Tofts, Larsson, and Brix.
- To elucidate the intercompatibility and parameter measurement capabilities of these Gd-DTPA kinetic models.
Main Methods:
- Analysis of data acquired using dynamic MRI with Gd-DTPA.
- Comparison of three compartment models (Tofts, Larsson, Brix) representing blood plasma and extravascular extracellular space (EES).
- Evaluation of parameter measurement: influx rate constant (kPSp), EES volume (ve), and efflux rate constant (K(ep)).
Main Results:
- All three models utilize intercompatible compartments for plasma and EES.
- The efflux rate constant (K(ep)) is the most straightforward parameter to measure.
- Accurate measurement of kPSp and ve requires additional data like pre-contrast T1 (T10) and tissue relaxivity (R1).
Conclusions:
- The Tofts, Larsson, and Brix models offer compatible frameworks for DCE-MRI analysis.
- K(ep) provides a readily obtainable kinetic parameter from Gd-DTPA studies.
- Separate quantification of kPSp and ve necessitates more comprehensive data acquisition protocols.