Cardiac multidetector-row CT: Retrospectively ECG-gated spiral with optimized temporal and spatial resolution: First clinical results.

Citation
Af. Kopp et al., Cardiac multidetector-row CT: Retrospectively ECG-gated spiral with optimized temporal and spatial resolution: First clinical results., ROFO-F RONT, 172(5), 2000, pp. 429-435
Citations number
21
Language
TEDESCO
art.tipo
Article
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging
Journal title
ROFO-FORTSCHRITTE AUF DEM GEBIET DER RONTGENSTRAHLEN UND DER BILDGEBENDEN VERFAHREN
ISSN journal
1438-9029 → ACNP
Volume
172
Issue
5
Year of publication
2000
Pages
429 - 435
Database
ISI
SICI code
1438-9029(200005)172:5<429:CMCRES>2.0.ZU;2-A
Abstract
The significantly improved temporal and spatial resolution of Multidetector -Row CT opens up new possibilities for cardiac imaging. A method with retro spectively EGG-gated spiral acquisition is presented. Materials and Methods : A total of 10 patients underwent cardiac CT on a fast multi-slice CT syst em with 4 simultaneously acquired slices and 0.5 s rotation time (Siemens S omatom Volume Zoom). Continuous spiral data of the entire heart volume (5 s tudies precontrast for calcium scoring, 5 studies with contrast) were acqui red together with the patient's ECG and reconstructed with dedicated spiral algorithms providing 250 ms temporal resolution. Three-dimensional image d ata sets were built up from overlapping slices that were reconstructed in a n arbitrary, user-defined phase of the heart cycle (e.g., diastolic phase). To evaluate the capability of the method for functional imaging, complete image volumes were reconstructed from the same spiral data set in different phases of the heart cycle. Results: Within a single breath-hold, a spiral data set of the entire heart Volume could be acquired. Typical scan times f or standard examinations with 3-mm slice width were 12-17 s, and for high-r esolution CT angiographies of the coronary arteries with 1.25-mm slice widt h about 25-35 s. Motion-free reconstruction of the heart and coronary arter ies with high spatial resolution were possible in the diastolic phase of th e heart cycle. Multiphase reconstructions from the same spiral scan data se t were possible. Conclusions: Fast multi-slice spiral CT with retrospective ly EGG-gated spiral reconstruction is well suited for three-dimensional and functional imaging of the heart, especially for high-resolution imaging of calcified coronary plaques and CT-angiography of the coronary arteries.