Optimized double inversion recovery for reduction of T 1 weighting in fluid-attenuated inversion recovery

Ananth J. Madhuranthakam, Subhendra N. Sarkar, Reed F. Busse, Rohit Bakshi, David C. Alsop

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Fluid-attenuated inversion recovery (FLAIR) is a routinely used technique in clinical practice to detect long T 2 lesions by suppressing the cerebrospinal fluid. Concerns remain, however, that the inversion pulse in FLAIR imparts T 1 weighting that can decrease the detectability and mischaracterize some lesions. Hence, FLAIR is usually acquired in conjunction with a standard T 2 to guard against these concerns. Recently, double inversion recovery (DIR) preparations have highlighted certain types of lesions by suppressing both cerebrospinal fluid and white matter but produce even stronger T 1 contrast than FLAIR. This work shows that the inversion times in a DIR sequence can be optimized to minimize unwanted T 1 weighting, enabling the acquisition of cerebrospinal fluid-suppressed images with pure T 2 weighting. This technique is referred to as T 1-nulled DIR. The theory to determine the optimized inversion times is discussed and the results are shown by simulations, normal volunteer studies, and multiple sclerosis patient studies. T 1-nulled DIR provides equivalent or superior contrast between gray and white matters as well as white matter and multiple sclerosis lesion at the same repetition time. Multiple sclerosis lesions appeared sharper on T 1-nulled DIR compared to FLAIR. T 1-nulled DIR has the potential to replace the combination of standard T 2 and FLAIR acquisitions in many clinical protocols.

Original languageEnglish (US)
Pages (from-to)81-88
Number of pages8
JournalMagnetic resonance in medicine
Volume67
Issue number1
DOIs
StatePublished - Jan 1 2012

Keywords

  • DIR
  • FLAIR
  • MS lesion
  • T
  • inversion recovery

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Fingerprint Dive into the research topics of 'Optimized double inversion recovery for reduction of T <sub>1</sub> weighting in fluid-attenuated inversion recovery'. Together they form a unique fingerprint.

  • Cite this