Technical Assessment for Liver Ultrasound

Technical Assessment for Liver Ultrasound

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A comprehensive technical assessment ensures optimal image quality, proper anatomical visualization, and accurate documentation. It includes evaluation of study type, image quality, and key anatomical structures such as liver contour, parenchyma, biliary tree, and adjacent organs. The assessment guides radiologists in diagnosing hepatic pathology accurately and consistently.
Transducer Selection The selection of the ultrasound transducer is crucial for achieving optimal liver imaging:

• Curved Array Transducer (2–5 MHz): Standard probe for abdominal imaging, offering deep penetration and wide field of view.
• Linear Array Transducer (5–12 MHz): Suitable for superficial lesions and guiding interventional procedures.
• Phased Array Transducer: Useful in intercostal imaging and in patients with limited acoustic windows (e.g., ICU patients).

Machine Settings and Optimization Proper machine settings are essential for clear visualization:

• Depth: Adjusted to include the entire liver, including posterior segments.
• Gain and TGC: Balanced for uniform brightness across the liver field.
• Focus: Positioned at or just below the region of interest.
• Dynamic Range: Moderate setting for better tissue contrast and detail.
• Harmonic Imaging: Enhances image clarity by reducing artifacts.

Doppler and Elastography Considerations

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For vascular assessment, Doppler settings must be optimized:

• Color Doppler: Adjust PRF and wall filter based on hepatic vessel velocity.
• Spectral Doppler: Use angle correction ≤60° to assess flow direction and waveform.
• Elastography: Perform in the right lobe intercostally, avoiding large vessels; patient should hold breath during acquisition for accurate liver stiffness measurement.