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


Leschka, Sebastian; Husmann, Lars; Desbiolles, Lotus M; Gaemperli, Oliver; Schepis, Tiziano; Koepfli, Pascal; Boehm, Thomas; Marincek, Borut; Kaufmann, Philipp A; Alkadhi, Hatem (2006). Optimal image reconstruction intervals for non-invasive coronary angiography with 64-slice CT. European Radiology, 16(9):1964-1972.

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±10.6years). 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 <65bpm (n=49) and ≥65bpm (n=31). Two blinded and independent readers assessed the image quality of each coronary segment with a diameter ≥1.5mm 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±13.1bpm (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 <65bpm, acceptable image quality was found in all coronary segments at 60%. At heart rates ≥65bpm, 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 <65bpm, diagnostic image quality of all coronary segments can be obtained at a single reconstruction interval of 60%

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±10.6years). 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 <65bpm (n=49) and ≥65bpm (n=31). Two blinded and independent readers assessed the image quality of each coronary segment with a diameter ≥1.5mm 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±13.1bpm (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 <65bpm, acceptable image quality was found in all coronary segments at 60%. At heart rates ≥65bpm, 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 <65bpm, diagnostic image quality of all coronary segments can be obtained at a single reconstruction interval of 60%

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Item Type:Journal Article, refereed, original work
Communities & Collections:National licences > 142-005
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:1 September 2006
Deposited On:13 Dec 2018 16:55
Last Modified:13 Dec 2018 16:55
Publisher:Springer
ISSN:0938-7994
OA Status:Green
Publisher DOI:https://doi.org/10.1007/s00330-006-0262-x
Related URLs:https://www.swissbib.ch/Search/Results?lookfor=nationallicencespringer101007s003300060262x (Library Catalogue)
PubMed ID:16699752

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