Pulsed saturation transfer contrast

✍ Scribed by Bob S. Hu; Steven M. Conolly; Graham A. Wright; Dwight G. Nishimura; Albert Macovski

• Book ID: 102953580
• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 605 KB
• Volume: 26
• Category: Article
• ISSN: 0740-3194
• DOI: 10.1002/mrm.1910260205

✦ Synopsis

Abstract

In vivo ^1^H conventional NMR image contrast generation usually relies on the macroscopic T~1~ and T~2~ relaxation parameters of the tissues of interest. Recently cross‐relaxation related image contrast has been reported by Wolff and Balaban in animal models. Due primarily to the broad lineshape of the intended saturation spin pool and the use of off‐resonance irradiation, high specific absorption rate and an auxiliary RF amplifier have been necessary to produce these images. The relatively long spin‐lattice relaxation property of this spin pool, however, suggests the use of pulse methods to achieve saturation. In this paper, we show that short‐T~2~ spin pools can be selectively saturated with short intense RF pulses. Cross‐relaxation time constants can be measured using the technique of saturation recovery. In vivo magnetization‐transfer‐weighted images can be produced using pulses on commercial whole‐body imagers without additional hardware.