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[Influence of Bowtie Filter and Patient Positioning on In-plane Dose Distribution and Image Quality in ECG-gated CT]

Kazuyoshi Minami1, Kosuke Matsubara2, Yuki Hayashi3

  • 1Department of Radiology, National Hospital Organization Kanazawa Medical Center (Current address: Clinical Radiology Service, National Hospital Organization Toyama Hospital).

Nihon Hoshasen Gijutsu Gakkai Zasshi
|June 21, 2019
PubMed

Insights

Optimizing bowtie filters and patient positioning in electrocardiographic (ECG)-gated computed tomography (CT) reduces radiation dose and enhances image quality. This study investigated these factors for improved cardiac imaging.

Area of Science:

  • Medical Imaging
  • Radiological Physics

Background:

  • Electrocardiographic (ECG)-gated computed tomography (CT) optimizes cardiac imaging by adjusting field of view (FOV) and centering on the heart.
  • Wider FOV and larger bowtie filters may be necessary for specific diagnoses (e.g., aortic diseases) or patient positioning, potentially impacting dose and image quality.

Purpose of the Study:

  • To evaluate the influence of bowtie filter size and patient positioning on radiation dose distribution, organ dose, and image quality in ECG-gated CT.
  • To identify optimal settings for minimizing radiation exposure while maintaining diagnostic image quality.

Main Methods:

  • Utilized radio photoluminescence glass dosimeters to measure in-plane dose distribution and organ-absorbed dose.
  • Assessed image quality by measuring signal-to-noise ratio (SNR).
  • Compared small (S) and large (L) bowtie filters and two phantom positioning methods (Heart and Body).

Main Results:

  • Volume CT dose index was higher with the large bowtie filter (71.8 mGy) compared to the small one (55.3 mGy).
  • Breast organ dose increased by 1.29 times with the large filter when centered on the heart (Heart-L vs. Heart-S).
  • Positioning affected in-plane dose distribution, with Heart-S showing a 25% increase anteriorly and 20% decrease posteriorly compared to Body-S. SNR decreased off-center.

Conclusions:

  • Appropriate selection of bowtie filter and patient positioning is crucial for reducing radiation dose in ECG-gated CT.
  • Optimized settings can significantly improve image quality and patient safety during cardiac CT examinations.

Keywords:
bowtie filtercomputed tomographydoseelectrocardiographic-gated computed tomographypositioning

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