Quiet MR sequences in clinical routine: initial experience in abdominal imaging.

Area of Science:

• Medical Imaging
• Acoustics
• Radiology

Background:

• Acoustic noise in Magnetic Resonance Imaging (MRI) can impact patient comfort and image quality.
• Optimizing MRI protocols to reduce noise is crucial for clinical applications.

Purpose of the Study:

• To assess the feasibility and limitations of acoustic noise reduction in a standard clinical MRI protocol for abdominal imaging.
• To evaluate the impact of noise reduction on image quality and diagnostic confidence.

Main Methods:

• Acoustic noise and image quality were evaluated in 17 patients using a standard liver MRI protocol.
• T2 TSE (T2-weighted Turbo Spin Echo) and GRE (Gradient-Recalled Echo) sequences were compared with quiet optimizations.
• Two blinded readers assessed artifacts, organ delineation, and diagnostic confidence. Signal-to-Noise Ratio (SNR) and Contrast-to-Noise Ratio (CNR) were measured.

Main Results:

• Significant acoustic noise reduction was observed in T2 TSE (-30.7%) and T2 HASTE (-22.6%) sequences.
• SNR and CNR decreased for quiet T2 TSE and T2 HASTE sequences but increased for T1 DIXON and T1 FLASH sequences.
• Inter-rater reliability for image quality assessment was high (k=0.987).

Conclusions:

• Sequence-based acoustic noise optimization offers significant benefits for T2 TSE and T2 HASTE abdominal MRI.
• Image quality and diagnostic confidence were maintained in T2 TSE and T2 HASTE sequences despite noise reduction.
• Challenges remain for noise reduction in T1 FLASH and DIXON sequences.