[Analysis of 99mTc-HIDA kinetics using an adaptive model]

Area of Science:

• Nuclear medicine
• Pharmacokinetics
• Hepatology

Background:

• Assessing hepatocyte function is crucial for diagnosing liver diseases.
• Existing pharmacokinetic models may lack adaptability for dynamic liver processes.
• Hepatoscintigraphy with 99mTc-HIDA offers a non-invasive method to evaluate liver function.

Purpose of the Study:

• To develop and validate an adaptive pharmacokinetic model for assaying hepatocyte function.
• To utilize 99mTc-HIDA hepatoscintigraphy within this model for detailed liver assessment.
• To establish the diagnostic utility of intercompartmental transport constants in liver disease.

Main Methods:

• Development of an adaptive 5-compartmental pharmacokinetic model.
• Hepatoscintigraphy using 99mTc-HIDA across vascular, parenchymal, and biliary phases.
• Calculation of transport constants, specifically K1,2 (blood-liver) and K2,1 (liver-blood).

Main Results:

• The adaptive model successfully evaluated the hepatocytic phase of 99mTc-HIDA transport.
• Intercompartmental constants K1,2 and K2,1 proved highly informative for differential diagnosis.
• The model demonstrated potential for quantifying the extent of liver involvement in disease.

Conclusions:

• The proposed adaptive pharmacokinetic model effectively assays hepatocyte transport function.
• This method aids in defining the degree of liver pathology.
• It supports therapeutic strategy selection, efficacy evaluation, and complication prediction.