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Cardiac Catheterization III: Left Heart Catheterization01:24

Cardiac Catheterization III: Left Heart Catheterization

Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...
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The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
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Potential for Dose Reduction in CT-Derived Left Ventricular Ejection Fraction: A Simulation Study.

Martin Weber Kusk1,2,3, Søren Hess2,3,4, Oke Gerke4,5

  • 1Radiography & Diagnostic Imaging, School of Medicine, University College Dublin, Dublin 4 Belfield, Ireland.

Tomography (Ann Arbor, Mich.)
|November 21, 2023
PubMed
Summary
This summary is machine-generated.

Reducing CT radiation dose by 20 times allows accurate left ventricular ejection fraction (LVEF) measurement, crucial for heart failure detection. Excluding papillary muscles ensures reliable LVEF assessment with minimal radiation exposure.

Keywords:
cardiaccomputed tomographydose reductionejection fractionfunctional imagingsimulationsystolic function

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Area of Science:

  • Medical Imaging
  • Cardiology
  • Radiology

Background:

  • Left ventricular ejection fraction (LVEF) is vital for diagnosing heart failure, especially during cardiotoxic chemotherapy.
  • Cardiac MRI is the gold standard but faces accessibility and patient-specific limitations.
  • CT offers accuracy for LVEF measurement alongside routine oncology scans, but high radiation dose is a concern.

Purpose of the Study:

  • To investigate the feasibility of significant radiation dose reduction in CT for LVEF assessment.
  • To develop and validate a noise simulation algorithm for reduced-dose CT imaging.
  • To determine the lowest acceptable radiation dose for accurate LVEF measurements.

Main Methods:

  • Developed a noise simulation algorithm using an anthropomorphic heart phantom scanned at 13 dose levels.
  • Iteratively optimized filtered backprojection parameters to maintain image quality.
  • Retrospectively analyzed 51 clinical CT coronary angiographies, simulating dose reductions to 25%, 10%, 5%, and 2%.
  • Measured LVEF with and without papillary muscles using clinical software and compared to full-dose scans via Bland-Altman analysis.

Main Results:

  • Excluding papillary muscles, LVEF measurements showed no significant bias at 25%, 10%, and 5% simulated doses compared to full-dose scans.
  • A significant bias of 4.4% was observed at the 2% simulated dose when papillary muscles were excluded.
  • Including papillary muscles resulted in small but significant biases across all simulated dose levels.

Conclusions:

  • CT-based LVEF measurement is feasible with dose reduction up to 20-fold (effective dose of 1 mSv).
  • Excluding papillary muscles from the LV volume is critical for maintaining accuracy at reduced doses.
  • This approach enables routine oncology CT scans to incorporate LVEF assessment with minimal additional radiation exposure.