Tissue characterization of myocardial infarction using T1ρ: Influence of contrast dose and time of imaging after contrast administration

✍ Scribed by Steffen Huber; Raja Muthupillai; Brenda Lambert; Mercedes Pereyra; Alicia Napoli; Scott D. Flamm

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 353 KB
• Volume: 24
• Category: Article
• ISSN: 1053-1807
• DOI: 10.1002/jmri.20720

✦ Synopsis

Abstract

Purpose

To determine whether contrast between acutely infarcted and normal myocardia in T~1~‐rho‐weighted cine TFE (T~1ρ~‐TFE) and delayed‐enhancement (DE) images (measured using a metric percent enhancement (PE)) varied with the dose or time of imaging after contrast administration.

Materials and Methods

Eighteen patients with acute myocardial infarction (AMI) were randomly divided into three groups according to the dose of gadoversetamide (0.1, 0.2, or 0.3 mmol/kg) administered. After contrast administration, T~1ρ~‐TFE images were acquired at five and 40 minutes, and DE images were acquired at 10 and 30 minutes.

Results

For T~1ρ~‐TFE imaging the PE values at 40 minutes were 70 ± 14, 98 ± 14, and 105 ± 41 at 0.1, 0.2, and 0.3 mmol/kg dose levels, which were significantly greater than the corresponding PEs at five minutes after contrast administration (44 ± 12, 71 ±14, and 36 ± 13). For DE and T~1ρ~‐TFE imaging the dose of contrast agent did not significantly affect the PE. However, with DE the PE tended to increase with the dose. At all dose levels, irreversible injury was more conspicuous in T~1ρ~‐TFE images acquired at 40 minutes than at five minutes after contrast.

Conclusion

In T~1ρ~‐TFE, acute infarction was more conspicuous in images acquired at a later time point, and the PE did not vary with the contrast dose. J. Magn. Reson. Imaging 2006. © 2006 Wiley‐Liss, Inc.