Dual mechanisms for change in myocardial signal intensity by means of a single MR contrast medium: Dependence on concentration and pulse sequence

M. Saeed, M. F. Wendland, T. Masui, K. K. Yu, Jian-Jian Li, N. Derugin, C. B. Higgins

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

To determine whether gadodiamide injection can provide sufficient enhancement on both T1- and T2-weighted spin-echo magnetic resonance (MR) images of the heart and skeletal muscles, anesthetized rats were divided into five groups. Groups 1-3 received 0.1 (n = 9), 0.3 (n = 8), or 0.5 (n = 8) mmol/kg gadodiamide injection, respectively, and T1-weighted images were obtained. Groups 4 and 5 received 0.3 or 0.5 mmol/kg gadodiamide injection; respectively, and T2-weighted images were obtained. Gadolinium concentration was measured in myocardium by means of inductively coupled plasma-atomic emission spectroscopy. On T1-weighted images, the 0.1 and 0.3 mmol/kg doses produced a dose-dependent increase in myocardial signal intensity proportional to gadolinium concentration. A dose of 0.5 mmol/kg, which correlated with higher gadolinium concentration and did not further increase myocardial signal intensity, prolonged the imaging window. On T2-weighted images, the 0.3 mmol/kg dose caused a transient decrease in myocardial signal intensity; the 0.5 mmol/kg dose produced greater and persistent loss of signal intensity. In conclusion, the changes in signal intensity induced by gadodiamide injection depend on the dose, pulse sequence, and type of tissue.

Original languageEnglish (US)
Pages (from-to)175-182
Number of pages8
JournalRadiology
Volume186
Issue number1
DOIs
StatePublished - Jan 1 1993
Externally publishedYes

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Keywords

  • Gadolinium
  • Magnetic resonance (MR), contrast enhancement
  • Magnetic resonance (MR), pulse sequences
  • Muscles, MR
  • Myocardium, MR

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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