High-pitch spiral acquisition: A new scan mode for coronary CT angiography

Abstract Coronary CT angiography allows high-quality imaging of the coronary arteries when state-of-the-art CT systems are used. However, radiation exposure has been a concern. We describe a new scan mode that uses a very high-pitch spiral acquisition, “Flash Spiral,” which has been developed specif...

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Bibliographic Details
Published in:Journal of cardiovascular computed tomography 2009-03, Vol.3 (2), p.117-121
Main Authors: Achenbach, Stephan, MD, Marwan, Mohamed, MD, Schepis, Tiziano, MD, Pflederer, Tobias, MD, Bruder, Herbert, PhD, Allmendinger, Thomas, PhD, Petersilka, Martin, PhD, Anders, Katharina, MD, Lell, Michael, MD, Kuettner, Axel, MD, Ropers, Dieter, MD, Daniel, Werner G., MD, Flohr, Thomas, PhD
Format: Article
Language:English
Subjects:
Cardiovascular
Computed tomography
Coronary Angiography - adverse effects
Coronary Angiography - methods
Coronary CT angiography
Coronary Stenosis - diagnostic imaging
Dual-source CT
Electrocardiography
Humans
Male
Middle Aged
Predictive Value of Tests
Radiation Dosage
Radiation exposure
Radiation Injuries - etiology
Radiation Injuries - prevention & control
Radiographic Image Interpretation, Computer-Assisted
Tomography, Spiral Computed
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Summary:Abstract Coronary CT angiography allows high-quality imaging of the coronary arteries when state-of-the-art CT systems are used. However, radiation exposure has been a concern. We describe a new scan mode that uses a very high-pitch spiral acquisition, “Flash Spiral,” which has been developed specifically for low-dose imaging with dual-source CT. The scan mode uses a pitch of 3.2 to acquire a spiral CT data set, while covering the entire volume of the heart in one cardiac cycle. Data acquisition is prospectively triggered by the electrocardiogram and starts in late systole to be completed within one cardiac cycle. Images are reconstructed with a temporal resolution that corresponds to one-quarter of the gantry rotation time. Throughout the data set, subsequent images are reconstructed at later time instants in the cardiac cycle. In a patient with a heart rate of 49 beats/min, the Flash Spiral scan mode was used with a first-generation dual-source CT system and allowed artifact-free visualization of the coronary arteries with a radiation exposure of 1.7 mSv for a 12-cm scan range at 120 kVp tube voltage.
ISSN:1934-5925
1876-861X
DOI:10.1016/j.jcct.2009.02.008