Comparison between multi-echo T2* with and without fat saturation pulse for quantification of liver iron overload

Area of Science:

• Radiology
• Medical Imaging
• Biophysics

Background:

• Accurate quantification of liver iron overload is crucial for patient management.
• The presence of hepatic steatosis (fat in the liver) complicates Magnetic Resonance Imaging (MRI) based iron quantification.
• Existing MRI techniques may yield inaccurate iron measurements due to confounding fat signals.

Purpose of the Study:

• To evaluate an enhanced multi-echo T2* MRI sequence with an additional fat suppression pulse.
• To assess the efficacy of this technique in subjects with concurrent liver iron overload and steatosis.
• To determine if fat suppression improves the reliability of liver iron quantification.

Main Methods:

• Retrospective review of 50 liver MRI scans (1.5T) from individuals with elevated ferritin.
• Utilized in-phase/out-of-phase sequences for steatosis detection.
• Compared standard multi-echo T2* sequence with a modified sequence incorporating a fat suppression pulse.
• Analyzed T2* values and their standard deviations statistically.

Main Results:

• Application of the fat saturation pulse significantly reduced the standard deviation of T2* values in patients with steatosis.
• Modulating the fat signal led to altered patient categorization regarding liver iron levels.
• One case demonstrated a re-classification from overloaded to normal liver iron levels after fat signal modulation.

Conclusions:

• The developed MRI technique enhances the precision of liver iron overload assessment.
• Improved accuracy has significant implications for patient treatment and clinical care decisions.
• This fat-suppression method offers a more reliable approach to diagnosing and monitoring iron overload in the presence of steatosis.