title: 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 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.
authors.affiliation: Department of Cardiology, University of Erlangen, Ulmenweg 18, 91054 Erlangen, Germany. stephan.achenbach@uk-erlangen.de
authors.forename: Stephan
authors.initials: S
authors.lastname: Achenbach
authors.forename: Mohamed
authors.initials: M
authors.lastname: Marwan
authors.forename: Tiziano
authors.initials: T
authors.lastname: Schepis
authors.forename: Tobias
authors.initials: T
authors.lastname: Pflederer
authors.forename: Herbert
authors.initials: H
authors.lastname: Bruder
authors.forename: Thomas
authors.initials: T
authors.lastname: Allmendinger
authors.forename: Martin
authors.initials: M
authors.lastname: Petersilka
authors.forename: Katharina
authors.initials: K
authors.lastname: Anders
authors.forename: Michael
authors.initials: M
authors.lastname: Lell
authors.forename: Axel
authors.initials: A
authors.lastname: Kuettner
authors.forename: Dieter
authors.initials: D
authors.lastname: Ropers
authors.forename: Werner G
authors.initials: WG
authors.lastname: Daniel
authors.forename: Thomas
authors.initials: T
authors.lastname: Flohr