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Optional MRI sequences for LI-RADS: why, what, and how?

Omar Kamal1,2, Ethan Sy3, Victoria Chernyak4

  • 1Oregon Health & Science University, Portland, OR, USA. kamal@ohsu.edu.

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Summary
This summary is machine-generated.

Accurate diagnosis of Hepatocellular carcinoma (HCC) relies on standardized imaging protocols like LI-RADS. Optional MRI sequences enhance detection and characterization of liver observations, improving diagnostic confidence.

Keywords:
Hepatocellular carcinomaLI-RADSLiver imagingMRI

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Area of Science:

  • Radiology
  • Oncology
  • Medical Imaging

Background:

  • Hepatocellular carcinoma (HCC) is the most common primary liver malignancy globally.
  • Noninvasive diagnosis of HCC is achievable through imaging, obviating the need for tissue biopsy.
  • The Liver Imaging Reporting and Data System (LI-RADS) provides a standardized algorithm for interpreting and reporting imaging studies in high-risk HCC patients.

Purpose of the Study:

  • To review optional MRI sequences for LI-RADS.
  • To discuss the advantages of these optional sequences in characterizing liver observations.
  • To explore technical optimization of optional sequences for improved image quality and artifact reduction.

Main Methods:

  • Review of LI-RADS technical recommendations for MRI.
  • Analysis of the role of optional MRI sequences (e.g., DWI, subtraction, hepatobiliary phase).
  • Discussion of technical considerations for optimizing image acquisition and minimizing artifacts.

Main Results:

  • LI-RADS categorizes liver observations (LR-1 to LR-5) based on malignancy probability, with LR-5 indicating >95% likelihood of HCC.
  • Minimum required MRI sequences include T1-weighted in-phase/out-of-phase, T2-weighted, and multiphase T1-weighted imaging.
  • Optional sequences like diffusion-weighted imaging (DWI) and hepatobiliary phase imaging improve diagnostic confidence by differentiating true lesions, detecting additional observations, and enhancing conspicuity.

Conclusions:

  • Adherence to optimal imaging protocols is crucial for accurate LI-RADS assessment.
  • Optional MRI sequences significantly enhance the diagnostic performance of LI-RADS by improving lesion characterization and confidence.
  • Technical optimization of these optional sequences is essential for maximizing their benefits and ensuring high-quality imaging for HCC diagnosis.