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Erschienen in: European Radiology 9/2006

01.09.2006 | Cardiac

Optimal image reconstruction intervals for non-invasive coronary angiography with 64-slice CT

verfasst von: Sebastian Leschka, Lars Husmann, Lotus M. Desbiolles, Oliver Gaemperli, Tiziano Schepis, Pascal Koepfli, Thomas Boehm, Borut Marincek, Philipp A. Kaufmann, Hatem Alkadhi

Erschienen in: European Radiology | Ausgabe 9/2006

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Abstract

The reconstruction intervals providing best image quality for non-invasive coronary angiography with 64-slice computed tomography (CT) were evaluated. Contrast-enhanced, retrospectively electrocardiography (ECG)-gated 64-slice CT coronary angiography was performed in 80 patients (47 male, 33 female; mean age 62.1±10.6 years). Thirteen data sets were reconstructed in 5% increments from 20 to 80% of the R-R interval. Depending on the average heart rate during scanning, patients were grouped as <65 bpm (n=49) and ≥65 bpm (n=31). Two blinded and independent readers assessed the image quality of each coronary segment with a diameter ≥1.5 mm using the following scores: 1, no motion artifacts; 2, minor artifacts; 3, moderate artifacts; 4, severe artifacts; and 5, not evaluative. The average heart rate was 63.3±13.1 bpm (range 38–102). Acceptable image quality (scores 1–3) was achieved in 99.1% of all coronary segments (1,162/1,172; mean image quality score 1.55±0.77) in the best reconstruction interval. Best image quality was found at 60% and 65% of the R-R interval for all patients and for each heart rate subgroup, whereas motion artifacts occurred significantly more often (P<0.01) at other reconstruction intervals. At heart rates <65 bpm, acceptable image quality was found in all coronary segments at 60%. At heart rates ≥65 bpm, the whole coronary artery tree could be visualized with acceptable image quality in 87% (27/31) of the patients at 60%, while ten segments in four patients were rated as non-diagnostic (scores 4–5) at any reconstruction interval. In conclusion, 64-slice CT coronary angiography provides best overall image quality in mid-diastole. At heart rates <65 bpm, diagnostic image quality of all coronary segments can be obtained at a single reconstruction interval of 60%.
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Metadaten
Titel
Optimal image reconstruction intervals for non-invasive coronary angiography with 64-slice CT
verfasst von
Sebastian Leschka
Lars Husmann
Lotus M. Desbiolles
Oliver Gaemperli
Tiziano Schepis
Pascal Koepfli
Thomas Boehm
Borut Marincek
Philipp A. Kaufmann
Hatem Alkadhi
Publikationsdatum
01.09.2006
Verlag
Springer-Verlag
Erschienen in
European Radiology / Ausgabe 9/2006
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-006-0262-x

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