Laser-polarized 129Xe NMR and MRI at Ultralow Magnetic Fields

✍ Scribed by Annjoe Wong-Foy; Sunil Saxena; Adam J. Moulé; Hans-Marcus L. Bitter; Juliette A. Seeley; Robert McDermott; John Clarke; Alexander Pines

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 344 KB
• Volume: 157
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.2002.2592

✦ Synopsis

Laser-polarized (129)Xe and a high-T(c)superconducting quantum interference device (SQUID) are used to obtain magnetic resonance images in porous materials at a magnetic field of 2.3 mT, corresponding to a Larmor frequency of 27 kHz. Image resolution of 1 mm is obtained with gradients of only 1 mT/m. The resolution of xenon chemical shifts in different physicochemical environments at ultralow fields is also demonstrated. Details of the circulating flow optical pumping apparatus and the SQUID spectrometer are presented.