Quantitation and the elimination of errors in bile reflux tests using a gamma camera

Area of Science:

• Nuclear Medicine
• Gastroenterology
• Medical Imaging Analysis

Background:

• Entero-gastric reflux is a condition that can be assessed using 99mTc HIDA scintigraphy and gamma cameras.
• Accurate quantitative assessment of reflux is crucial for diagnosis and management.
• Existing methods may be subject to errors that affect quantitative accuracy.

Purpose of the Study:

• To develop and validate a computer program for correcting errors in quantitative entero-gastric reflux assessment.
• To improve the accuracy of measuring bile reflux using gamma camera imaging.

Main Methods:

• Development of a computer program to correct for multiple error sources in 99mTc HIDA scintigraphy.
• Validation of the technique using naso-gastric aspiration and phantom experiments.
• Application of the corrected technique in 23 patient studies.

Main Results:

• Computer correction significantly reduced the measured percentage of injected dose (PID) in the stomach for patients without visual reflux (from 1.9% to <1%).
• For patients with reflux, correction decreased the mean PID from 5.8% to 1.7%.
• Computer-corrected gastric PID (3%) showed no significant difference compared to aspiration measurements (3.5%) in 14 patients.

Conclusions:

• Computer correction is essential for accurate quantitative assessment of entero-gastric reflux using gamma camera imaging.
• The developed computer program effectively corrects for errors, enhancing the reliability of bile reflux quantification.
• This validated technique provides a more precise method for evaluating entero-gastric reflux in clinical practice.