A fast and effective method to assess myocardial necrosis by means of contrast magnetic resonance imaging

Vincenzo Positano, Alessandro Pingitore, Assuero Giorgetti, Brunella Favilli, Maria Filomena Santarelli, Luigi Landini, Paolo Marzullo, Massimo Lombardi

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose. Contrast magnetic resonance (CMR) can identify myocardial necrosis after gadolinium administration as a hyperenhanced (HE) area. Yet there are no software tools that can effectively quantify such an area. The aim of this study is to develop a robust and effective algorithmic method for defining the extent of myocardial necrosis evidenced through CMR. Method. Fifteen patients with previous myocardial infarction underwent nitrate Tetrofosmin G-SPECT and CMR. A software tool was developed, allowing semiautomatic detection of endocardial and epicardial borders and the automatic detection of HE regions. The accuracy of the proposed quantitative method of analysis has been tested with G-SPECT analysis that it is less than an ideal method for assessing myocardial viability, but at present is accepted and widely used in the clinical arena. Results. Segmental (SEHE) and global extension of HE were evaluated. HE was present in 161 of the 255 analyzed segments. Of the 161 HE segments, the mean SEHE was 36 ± 30%. The operator independence (intraobserver: r = 0.97, p <0.0001, interobserver, r = 0.95, p <0.0001) was good and significant, with noticeable time savings with respect to manual analysis. There was strong and inverse correlation between SEHE and scintigraphic regional uptake reduction (r = -0.66, p <0.0001), and also a positive correlation between SEHE and SPECT defect extension (r = 0.75, p <0.0001). When assessing the global extent of necrosis, the correlation between the two techniques was strong (r = 0.79, p = 0.0004). Conclusions. The proposed method of quantifying myocardial necrosis by CMR is highly reliable, reproducible, and operator-independent for quantifying.

Original languageEnglish
Pages (from-to)487-494
Number of pages8
JournalJournal of Cardiovascular Magnetic Resonance
Volume7
Issue number2
DOIs
Publication statusPublished - 2005

Keywords

  • Automatic methods
  • Contrast delayed enhanced MRI
  • G-SPECT
  • Myocardial necrosis

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology
  • Family Practice

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