Quantitative analysis of multiple biokinetic models using a dynamic water phantom: A feasibility study

Area of Science:

• Biomedical Engineering
• Radiopharmacy
• Nuclear Medicine

Background:

• Biokinetic models are crucial for understanding radiopharmaceutical behavior in the body.
• Accurate modeling requires robust experimental validation.
• Existing methods may lack the dynamic and adjustable nature needed for complex simulations.

Purpose of the Study:

• To develop and validate a dynamic water phantom for simulating human metabolic mechanisms.
• To analyze and compare biokinetic models using experimental data from the phantom.
• To assess the feasibility of using the phantom for radiopharmaceutical research.

Main Methods:

• Custom-built dynamic water phantom with adjustable chambers and water loops.
• Use of a sealed, static water loop with Technetium-99m-Methyl Diphosphonate (TC-99m-MDP).
• Data acquisition using a clinical gamma camera and analysis via MATLAB for comparison with theoretical models.
• Development of a dimensionless agreement (AT) index for evaluation.

Main Results:

• The phantom successfully mimicked metabolic mechanisms for data acquisition.
• Experimental measurements were compared to theoretical estimations from MATLAB.
• The dimensionless agreement (AT) index ranged from 5.6 to 48.7 across five tested cases.
• The study confirmed the acceptable feasibility of the developed phantom.

Conclusions:

• The dynamic water phantom provides a feasible platform for validating biokinetic models.
• The system allows for adjustable parameters to simulate various metabolic conditions.
• This approach aids in the accurate assessment of radiopharmaceutical behavior and biodistribution.