Measuring SeHCAT retention: a technical note

Area of Science:

• Nuclear Medicine
• Gastroenterology
• Diagnostic Imaging

Background:

• Bile acid malabsorption (BAM) is an increasingly recognized cause of severe chronic diarrhea.
• The SeHCAT (selena-25-homocholic acid) retention test has been the gold standard for BAM diagnosis since the 1980s.
• Increased referrals for SeHCAT testing necessitate efficient and accessible diagnostic methods.

Purpose of the Study:

• To review and discuss standard techniques for measuring SeHCAT retention.
• To present a simplified, modified technique for SeHCAT retention measurement.
• To adapt the SeHCAT test for use with modern dual-headed gamma cameras.

Main Methods:

• Review of established SeHCAT retention measurement protocols.
• Description of a modified technique utilizing a noncollimated whole-body scanner.
• Adaptation of the modified technique for contemporary dual-headed gamma camera systems.

Main Results:

• Standard SeHCAT retention measurement techniques are discussed.
• A simple, modified technique using a noncollimated whole-body scanner is detailed.
• The modified technique is suitable for most modern dual-headed gamma cameras.

Conclusions:

• The SeHCAT test remains crucial for diagnosing bile acid malabsorption.
• A modified, simplified scanning technique offers a practical alternative for SeHCAT retention measurement.
• This adapted method enhances the accessibility and applicability of SeHCAT testing with current imaging technology.