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Optimal abdominal CT protocol for obese patients.

A Qurashi1, L Rainford2, A Ajlan3

  • 1Radiography and Diagnostic Imaging, School of Medicine, University College Dublin, Ireland; Faculty of Applied Medical Sciences, Taibah University, Madinah, Saudi Arabia.

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PubMed
Summary
This summary is machine-generated.

Optimizing abdominal CT protocols for obese patients significantly reduces radiation dose by up to 60% while maintaining diagnostic image quality. Low kilovoltage (kV) and iterative reconstruction (IR) techniques are effective for dose reduction in this population.

Keywords:
Abdominal CTCT radiation doseObesity imaging

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Area of Science:

  • Radiology
  • Medical Imaging
  • Radiation Oncology

Background:

  • Obese patients undergoing abdominal CT scans often receive higher radiation doses.
  • Optimizing CT protocols is crucial for balancing image quality and radiation exposure in this demographic.

Purpose of the Study:

  • To investigate the impact of various abdominal CT protocols on radiation dose and image quality in obese patients.
  • To identify optimal scanning parameters for reducing radiation dose without compromising diagnostic image quality.

Main Methods:

  • Five abdominal/pelvis CT protocols with varying parameters (kV, reference mAs, reconstruction techniques like filtered back projection (FBP) and iterative reconstruction (IR)) were evaluated on three scanners.
  • Image quality was assessed using visual grading analysis and objective measures (noise, signal/contrast-noise ratios).
  • Radiation dose was compared across protocols for obese patients (n=42) and validated prospectively (n=47).

Main Results:

  • A 60% mean radiation dose reduction was achieved using 100 kV and SAFIRE iterative reconstruction (strength 3) compared to the routine protocol (p=0.001).
  • The FBP protocol with 120 kV and 190 reference mAs reduced radiation dose by up to 30% (p=0.008).
  • Both optimized protocols demonstrated subjective and objective image quality comparable to the routine protocol (p>0.05), with improved quality noted with increasing SAFIRE strength.

Conclusions:

  • Radiation dose in abdominal CT for obese patients can be effectively optimized while preserving image quality.
  • Iterative reconstruction techniques, combined with lower kilovoltage and optimized reference mAs, enable significant radiation dose reduction (30-60%) in obese patients without sacrificing image quality.