google ads
Cardiac: Coronary CTA Dual Source CT Imaging Pearls - Educational Tools | CT Scanning | CT Imaging | CT Scan Protocols - CTisus
Imaging Pearls ❯ Cardiac ❯ Coronary CTA Dual Source CT

-- OR --

  • "In patients with heart rates of 65 beats/min or less, the higher temporal resolution of dual source CT coronary angiography results in improved accuracy and specificity for the diagnosis of significant stenoses on a per segment level at a similar radiation dose, but provides a comparable diagnostic accuracy on a patient based level as does 64-section coronary angiography."

    Dual Source versus 64-Section CT Coronary Angiography at Lower Heart Rates: Comparison of Accuracy and Radiation Dose
    Baumuller S et al.
    Radiology 2009;253:56-64

  • "Dual-source step and shoot mode CT coronary angiography yielded diagnostic image quality for 97.9% of coronary segments at a low radiation dose."

    Dual-Source CT in Step-and-Shoot Mode: Noninvasive Coronary Angiography with Low Radiation Dose
    Stolzmann P et al.
    Radiology 2008; 249:71-80
  • "Dual-source (DS) CT coronary angiography in the step-and-shoot (SAS) mode can be performed in patients with a heart rate lower than 70 beats per minute and a body mass index (BMI) lower than 30 kg/m², and it enabled diagnostic quality visualization of 97.9% of all coronary segments in the current study."

    Dual-Source CT in Step-and-Shoot Mode: Noninvasive Coronary Angiography with Low Radiation Dose
    Stolzmann P et al.
    Radiology 2008; 249:71-80
  • "Step and shoot mode DS CT coronary angiography with automated tube current modulation is associated with mean estimated effective dose of 2.6 mSv with the 120 kV protocol and 1.2 mSv with the 100 kV protocol."

    Dual-Source CT in Step-and-Shoot Mode: Noninvasive Coronary Angiography with Low Radiation Dose
    Stolzmann P et al.
    Radiology 2008; 249:71-80
  • " Using dual-source CT, the overall optimal reconstruction window is at 75% of the R-R interval in patients with low or intermediate heart rates. In patients with heart rates > 80 bpm, systolic reconstruction often yield superior image quality compared with diastolic reconstruction."

    Optimal Systolic and Diastolic Reconstruction Windows for Coronary CT Angiography Using Dual Source CT
    Seifarth H et al
    AJR 2007; 189:1317-1323
  • "The overall image quality of dual-source CT coronary angiography is sufficient for diagnosis within a wide range of mean heart rates and variability of heart rates. Only heart rates that are both high and variable significantly deteriorate image quality, but the quality remains adequate for diagnosis."

    Dual-Source CT Coronary Angiography:Image Quality, Mean Heart Rate, and Heart Rate Variability
    Matt D et al.
    AJR 2007;189:567-573
  • "Using dual source CT, the overall optimal reconstruction window is at 75% of the R-R interval in patients with low or intermediate heart rates. In heart rates >80 BPM, systolic reconstructions often yield superior image quality compared with diastolic reconstructions."

    Optimal Systolic and Diastolic Reconstruvtion Windows for Coronary CT Angiography Using Dual-Source CT
    Seifarth H et al.
    AJR 2007; 189:1317-1323
  • "The overall image quality of dual-source CT coronary angiography is sufficient for diagnosis within a wide range of mean heart rates and variability of heart rates."

    Dual-Source CT Coronary Angiography:Image Quality, Mean Heart Rate, and Heart Rate Variability
    Matt D et al.
    AJR 2007; 189:567-573
  • - 2 x-ray tubes and 2 detector arrays
    - Temporal resolution increases with gantry rotation time of .33 seconds, the temporal resolution of the system is one quarter of the rotation time or 83 msec
  • Coronary/Cardiac: .83 msec scan times means

    - No need for beta blockers
    - Excellent visualization of coronary arteries across most heart rates
    - Better visualization of the aortic and mitral valves
  • Coronary/Cardiac: .83 msec scan times means

    - Functional imaging including ejection fraction, left ventricular function, wall motion, valve assessment
    - Potential ability to evaluate coronary arteries in both diastole and systole
  • Advantages

    - Lower radiation dose (on the order of 50% less)
    - No need for beta blockers
    - Small risk in most patients
    - Asthmatics can be scanned
    - Ideal in ER setting with improved throughput

Privacy Policy

Copyright © 2024 The Johns Hopkins University, The Johns Hopkins Hospital, and The Johns Hopkins Health System Corporation. All rights reserved.