Meeting Banner
Abstract #3869

Fluorinated Gas MR Imaging at Ultra Short Echo Time: Initial Results on a 1.5 T Clinical System

Pascal Hagot1, Ludovic De Rochefort1, Jean-Christophe Ginefri1, Rose-Marie Dubuisson1, Marie Poirier-Quinot1, Jean-Pierre Ruaud1, Hongchen Wang1, Xavier Matre1, Luc Darrasse1

1IR4M(UMR8081), Univ Paris-Sud, CNRS, Orsay, France

Using inert fluorinated gas as sulfur hexafluoride have proven its feasibility without the need of polarizing the gas thanks to its short T1 (few ms) that allows rapid repetition of RF pulse and thus a high number of signal averages. On the other hand, its short T2* ~ 1 ms reduces significantly the available time to acquire NMR signal after an excitation RF pulse. To overcome this constraint, ultra-short echo time sequences can be used. Preliminary UTE experiments using SF6 on a clinical 1.5T scanner and show the significant gain over standard gradient-echo acquisition.

Abstract PDF Presentation Video

Keywords

absolute abstract acquisition acquisitions airways allowed allows alternative animal approaches arbitrary atmospheric authors available averaging background blue bracelet calibration central clinical coil combined complex compliant computing constraint controlled cost coupling dedicated degree designed despite developed deviation deviations dimension displays double enclosed equipped evaluate evaluated eventually excitation explore extract feasibility flow fluid fluorinated fluorine fold frequency fruitful gain gases geometries gradient grounds hand helium hexafluoride human implemented improve improvement inert influence initial jean like limited limits made materials matrix mouth much ninety noble noise nuclei option outer overcome pascal phantom pixel polarizations polarized potential power preamplifier preliminary pressure procedure profile pulse pure quality quantitatively radial ramp reach realistic receive recorded repetition report respect respectively rigid rose sampling scale scanner selected sets shape short shortest significantly slice structure sulfur switch system thank thermally trachea tracked trans transmit tuned twenty ultra underlined units univ unmatched upper varying widely worldwide xenon