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Related Experiment Videos

Image mottle in abdominal CT.

J F Ende1, W Huda, P R Ros

  • 1Department of Radiology, University of Florida College of Medicine, Gainesville, USA.

Investigative Radiology
|April 10, 1999
PubMed
Summary
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Image mottle in abdominal CT scans is influenced by patient size and technique factors. Adjusting kilovoltage peak (kVp) and milliampere-seconds (mAs) can control mottle for clearer abdominal CT images.

Area of Science:

  • Radiological Physics
  • Medical Imaging Technology
  • Diagnostic Radiology

Background:

  • Image mottle, a form of noise, can degrade the quality of computed tomography (CT) images.
  • Understanding factors influencing image mottle is crucial for optimizing diagnostic accuracy in abdominal CT examinations.

Purpose of the Study:

  • To investigate the impact of radiographic technique factors and patient size on image mottle in conventional abdominal CT.
  • To establish relationships between technique parameters (kVp, mAs) and patient dimensions with image mottle.

Main Methods:

  • Utilized water phantoms simulating pediatric (16 cm) and adult (32 cm) abdominal sizes to assess image mottle.
  • Analyzed retrospective CT data from 39 noncontrast and 49 contrast-enhanced liver scans.

Related Experiment Videos

  • Measured mean liver parenchyma Hounsfield units and corresponding image mottle levels.

    • Main Results:

    • Image mottle was inversely proportional to the square root of mAs (mottle ∝ mAs⁻⁰.⁵).
    • Larger phantom diameter (32 cm vs. 16 cm) increased mottle by 2.4x; higher kVp (140 kVp vs. 80 kVp) reduced mottle by 2.5x.
    • A 3 cm increase in patient diameter necessitated approximately 65% more mAs to maintain consistent mottle.

    Conclusions:

    • Image mottle in abdominal CT is controllable by adjusting radiographic technique factors.
    • Technique factors, particularly milliampere-seconds (mAs), should be tailored to individual patient size for optimal image quality.