MR relaxometry on a whole-body imager: quality control

Area of Science:

• Medical Imaging
• Magnetic Resonance Imaging (MRI)
• Biophysics

Background:

• Accurate measurement of proton relaxation time T2 is crucial for various MRI applications.
• Assessing the precision and reliability of MRI scanners for T2 quantification is essential for clinical translation.

Purpose of the Study:

• To evaluate the repeatability and reproducibility of T2 measurements using a Siemens whole-body MRI scanner.
• To assess the suitability of the Siemens Vision imager for in vivo T2 evaluation.
• To implement and validate a quality control method for T2 determination.

Main Methods:

• Long-term monitoring of average T2 values in phantoms.
• Utilized a standard 16-echo Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence.
• Applied Shewhart control diagrams for continuous quality control.

Main Results:

• Excellent repeatability (2.6%) and good reproducibility (9.7%) were observed for T2 values around 81 ms.
• The Siemens Vision imager demonstrated suitability for in vivo T2 evaluation.
• Shewhart control diagrams proved effective for ongoing quality assurance.

Conclusions:

• The Siemens Vision MRI system offers reliable and reproducible T2 measurements.
• The implemented quality control methods ensure the accuracy of T2 determination over time.
• This study supports the use of this MRI system for quantitative T2 imaging in research and potentially clinical settings.