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MO-D-218-02: Ultrasound Phantoms in Image Quality Measurements and Performance Assessment.

E Madsen1

  • 1University of Wisconsin, Madison, WI.

Medical Physics
|May 19, 2017
PubMed
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New ultrasound quality assurance protocols focus on three key parameters: element or channel failure (EOCF), maximum depth of penetration (MDOP), and distance measurement accuracy (DMA). This study details phantoms and methods for reliably measuring these critical ultrasound imaging performance metrics.

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Area of Science:

  • Medical Imaging Physics
  • Diagnostic Ultrasound Technology
  • Quality Assurance in Healthcare

Background:

  • Routine quality assurance (QA) in diagnostic ultrasound has converged on three essential parameters: element or channel failure (EOCF), maximum depth of penetration (MDOP), and distance measurement accuracy (DMA).
  • Previous research, including a four-year study from the Mayo Clinic, has informed these QA standards.
  • Various phantoms have been developed to facilitate these measurements, utilizing different materials and designs.

Purpose of the Study:

  • To describe and evaluate a range of ultrasound phantoms designed for the accurate measurement of EOCF, MDOP, and DMA.
  • To present methodologies and results for implementing these phantom-based QA measurements.
  • To introduce a method for quantitatively assessing imaging performance through the detectability of low-echo spheres as a function of depth.

Main Methods:

  • Utilized diverse phantoms: a multi-parameter phantom with flat/cone windows, tissue-mimicking material, and nylon fibers; starch suspension for EOCF; polyurethane for EOCF/MDOP; and silicone for EOCF.
  • Employed image cine loops with statistically independent frames for EOCF and MDOP determination, with ongoing software development for data averaging.
  • Developed phantoms with spatially randomized low-echo spheres (4mm and 2mm) to quantitatively determine detectability (mean lesion signal-to-noise ratio, LSNR) as a function of depth for various transducer types.

Main Results:

  • Demonstrated the utility of specialized phantoms in measuring key ultrasound QA parameters (EOCF, MDOP, DMA).
  • Quantified the detectability of low-echo spheres (down to -40 dB) using LSNR, providing a measure of the scanner's ability to delineate small inclusions.
  • Showcased phantoms compatible with a wide range of transducers, including phased and curved arrays, ensuring broad applicability.

Conclusions:

  • The described phantoms and methods provide a robust framework for quantitative ultrasound quality assurance.
  • Accurate measurement of EOCF, MDOP, and DMA is crucial for maintaining high-quality diagnostic ultrasound imaging.
  • Assessing low-echo sphere detectability offers valuable insights into a scanner's performance in visualizing subtle anatomical details and pathologies.