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Related Concept Videos

Compartment Models: Two-Compartment Model01:20

Compartment Models: Two-Compartment Model

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The two-compartment model divides the body into central and peripheral compartments to account for varying blood perfusion rates among organs and tissues, affecting drug distribution. The central compartment includes blood and highly perfused tissues with rapid drug distribution, while the peripheral compartment contains tissues with slower drug distribution. After a single IV bolus dose, the drug concentration is high in plasma and low in tissues. The drug distribution between compartments...
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Compartment Models: Single-Compartment Model01:14

Compartment Models: Single-Compartment Model

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The single-compartment model serves as a simplified representation of the human body. This model assumes that the body functions as a single, well-mixed open compartment. When a drug is administered intravenously, it enters the body and quickly distributes uniformly. The drug then undergoes biotransformation and elimination, ultimately leaving the body. The volume of this compartment is referred to as the apparent volume of distribution into which the drug can uniformly distribute. In this...
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Two-Compartment Open Model: Extravascular Administration01:12

Two-Compartment Open Model: Extravascular Administration

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The two-compartment model for extravascular administration represents a drug's absorption and distribution process. It features a central compartment, where the drug is first absorbed, and a peripheral compartment, which illustrates the drug's distribution throughout the body. The rate of change in drug concentration in the central compartment is calculated by three exponents: absorption, distribution, and elimination.
The absorption exponent (ka) indicates the speed at which the drug...
219
Three-Compartment Open Model01:06

Three-Compartment Open Model

248
The three-compartment open model is a pharmacokinetic model used to describe the distribution and elimination of drugs following extravascular administration. It comprises a central compartment representing the plasma and two peripheral compartments. The highly perfused peripheral compartment represents organs and tissues with a rich blood supply, such as the liver, kidneys, and lungs. The scarcely perfused peripheral compartment represents tissues with lower blood supply, such as adipose...
248
Two-Compartment Open Model: Overview01:05

Two-Compartment Open Model: Overview

156
Multicompartmental models are crucial tools in pharmacokinetics, providing a framework to understand how drugs move within the body. The two-compartment model is a crucial subtype, segmenting the body into central and peripheral compartments. The central compartment represents areas with high blood flow, such as plasma and highly perfused organs like the kidneys and liver, while the peripheral compartment signifies tissues with lower blood flow, like adipose tissue and muscle tissue.
The...
156
Two-Compartment Open Model: IV Infusion01:15

Two-Compartment Open Model: IV Infusion

252
A two-compartment model is a vital tool in pharmacokinetics, providing an essential understanding of drug behavior, especially for those administered via zero-order intravenous infusion. This model outlines two compartments: the central compartment, where elimination occurs, and the peripheral compartment.
The model illustrates the decrease in plasma drug concentration from the central compartment with a specific equation. It shows that under steady-state conditions, the drug's input rate...
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Updated: Jul 14, 2025

Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy
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Implications of fitting a two-compartment model in single-shell diffusion MRI.

Jordan A Chad1,2, Nir Sochen3,4, J Jean Chen1,2,5

  • 1Rotman Research Institute, Baycrest Academy for Research and Education, Toronto, ON, Canada.

Physics in Medicine and Biology
|October 10, 2023
PubMed
Summary
This summary is machine-generated.

Fitting single-shell diffusion MRI data to two-compartment models reveals enhanced sensitivity to white matter (WM) changes over diffusion tensor imaging (DTI). This study clarifies the implications of using these models with limited data.

Keywords:
brain agingdiffusion MRImodelingsensitivitywhite matter

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Area of Science:

  • Neuroimaging
  • Biomedical Engineering
  • Diffusion MRI

Background:

  • Single-shell diffusion MRI data is commonly analyzed using two-compartment models, comprising hindered and isotropic compartments.
  • The isotropic compartment fraction (f) is reportedly sensitive to white matter (WM) conditions and pathologies, but its biological source remains unvalidated.

Purpose of the Study:

  • To investigate the sensitivity implications of fitting single-shell diffusion MRI data to a two-compartment model, setting aside biological interpretations of the isotropic fraction (f).
  • To understand the relationship between one-compartment (DTI) and two-compartment models under specific conditions.

Main Methods:

  • Analysis of single-shell diffusion MRI data using a two-compartment model with fixed mean diffusivities.
  • Identification of a nonlinear transformation between diffusion tensor imaging (DTI) and the two-compartment model.

Main Results:

  • The study reveals a mathematical link between DTI and the two-compartment model, suggesting no additional information is gained solely from fitting the latter.
  • Despite the lack of new information, two-compartment models show enhanced sensitivity over DTI for detecting certain WM alterations, like age-related changes.

Conclusions:

  • The enhanced sensitivity of two-compartment models with single-shell data is an artifact of the fitting process, not necessarily a reflection of new biological insight.
  • This finding offers valuable context for interpreting results from two-compartment models when only single-shell diffusion MRI data is available, emphasizing that it does not replace multi-shell data acquisition.