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Related Concept Videos

Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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Quantifying Patient Positioning Errors and Radiation Dose Variation in Cardiac Computed Tomography Angiography.

Yasser H Hadi1,2, Hassan B Hawsawi3, Niamh Moore1

  • 1Discipline of Medical Imaging and Radiation Therapy, School of Medicine and Health, University College Cork, Cork, Ireland.

Journal of the Saudi Heart Association
|May 14, 2026
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Summary

Patient positioning errors are common in cardiac CT scans, but do not directly correlate with radiation dose when accounting for patient factors. Optimizing patient centring could significantly reduce radiation exposure.

Keywords:
CTCardiac CTOff-centringPatient positioningRadiation dose

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Area of Science:

  • Medical Imaging
  • Radiological Physics
  • Radiation Dose Optimization

Background:

  • Accurate patient centring at the computed tomography (CT) scanner isocentre is crucial for minimizing radiation dose.
  • Previous studies have highlighted the importance of precise patient positioning in CT examinations.

Purpose of the Study:

  • To quantify patient positioning errors in cardiac CT angiography.
  • To assess the relationship between these positioning errors and radiation dose.
  • To estimate potential radiation dose reductions achievable through optimal patient centring.

Main Methods:

  • Retrospective observational study of 399 adult patients undergoing ECG-gated cardiac CT angiography.
  • Calculation of vertical and lateral deviations from the scanner isocentre using scout images and institutional dose monitoring software.
  • Extraction of radiation dose indices (CTDIvol, DLP) from DICOM reports.
  • Statistical analysis including correlation, multivariable regression, and simulation modeling.

Main Results:

  • High prevalence of off-centring: 83% in anteroposterior (AP) and 50% laterally.
  • Severe AP off-centring (>30 mm) in 39% of cases.
  • No independent association between off-centring and radiation dose (CTDIvol, DLP) after adjusting for BMI, age, and sex.
  • Male patients and higher BMI categories showed greater off-centring.

Conclusions:

  • Patient off-centring is highly prevalent in cardiac CT.
  • Adjusting for patient demographics and BMI, off-centring did not independently impact radiation dose.
  • Scenario modeling suggests potential for significant radiation dose reduction (approx. 12%) with ideal centring, requiring prospective validation.