1017 Computer-assisted calculation of myocardial infarct size shortens the evaluation time of contrast enhanced cardiac
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BioMed Central
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Meeting abstract
1017 Computer-assisted calculation of myocardial infarct size shortens the evaluation time of contrast enhanced cardiac MRI Jan E Engvall*1, Lene Rosendahl2,3, Peter Blomstrand2,3, Jan Ohlsson2,3, PerGunnar Bjorklund2,3, Britt-marie Ahlander2,4 and Einar Heiberg5,6 Address: 1Linkoping University, Linkoping, Sweden, 2County Hospital Ryhov, Jonkoping, Sweden, 3Department of Clinical Physiology, Jonkoping, Sweden, 4MR-department, Jonkoping, Sweden, 5Lund University, Lund, Sweden and 6Department of Clinical Physiology, Lund, Sweden * Corresponding author
from 11th Annual SCMR Scientific Sessions Los Angeles, CA, USA. 1–3 February 2008 Published: 22 October 2008 Journal of Cardiovascular Magnetic Resonance 2008, 10(Suppl 1):A142
doi:10.1186/1532-429X-10-S1-A142
Abstracts of the 11th Annual SCMR Scientific Sessions - 2008
Meeting abstracts – A single PDF containing all abstracts in this Supplement is available here. http://www.biomedcentral.com/content/pdf/1532-429X-10-S1-info.pdfThis abstract is available from: http://jcmr-online.com/content/10/S1/A142 © 2008 Engvall et al; licensee BioMed Central Ltd.
Introduction
Results
Delayed enhancement magnetic resonance imaging (DEMRI) depicts scar in the left ventricle which can be quantitatively measured. Manual segmentation and scar determination is time consuming.
The time for evaluating a cardiac MRI study was 9.2 ± 1.8 minutes with the semi-automatic corrected method, of which 1.2 ± 0.6 minutes was devoted to minor adjustments. The manual infarct sizing required 21.6 ± 4.5 minutes. Infarct volume and infarct percentage were 26+20 ml and 15+11% with the semiautomatic corrected method, 22+17 ml and 13+10% with the manual method. With the computer software, infarct volume and percentage was slightly larger, 3.8 ± 8.1 ml and 2.1 ± 4.4% than with the manual method, p = 0.005 for both, but the difference was deemed clinically acceptable.
Purpose The purpose of this study was to evaluate a software for infarct quantification (Segment, http://segment.heib erg.se), to compare with manual scar determination, and to measure the time saved.
Methods Forty patients, 33 men and 7 women, age 65 ± 10 years (range 36–84) were consecutively enrolled. Patients referred for myocardial SPECT on suspicion of coronary artery disease were included if they had an irreversible uptake reduction suggesting a myocardial scar. A standard segmented IR turboFLASH sequence was employed on a Siemens Magnetom Vision 1.5 T magnet. Segmentation of the endo- and epicardial borders on short axis slices was performed manually and independently by two observers, followed by running the software for automatic determination of scar volume. The time required for segmentation was recorded. The automatic scar analysis took only a few seconds. In the manual method, the myocardium and the scar areas were delineated with Image J.
Conclusion A computer software for myocardial volume and infarct size determination cut the evaluation time by more than 50% co
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