PMID: 9178249Jun 1, 1997Paper

Dispersion in magnetization transfer contrast at a given specific absorption rate due to variations of RF pulse parameters in the magnetization transfer preparation

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Y WangC A Mistretta

Abstract

The effects of RF pulse parameters on magnetization transfer contrast (MTC) were investigated using a magnetization prepared segmented fast gradient echo sequence. MTC was found not to be uniquely determined by the specific absorption rate (SAR). RF pulse parameters (RF amplitude, number of RF pulses and RF duration) also affect MTC. There can be 40% variation in MTC due to differences in RF parameters at SAR = 1 W/kg for a 70-kg subject. Increasing the number of RF pulses is a more efficient way to increase MTC than increasing RF amplitude. This phenomenon is likely caused by the fact that the time scale for magnetization transfer between the free and restricted proton pools is on the same order or longer than the duration of the MT pulse. Accordingly, increase in the MT pulse duration by increasing the number of RF pulses in the MT pulse allows more effective magnetization transfer. Such information can be used as a guide to select RF pulse parameters for a magnetization transfer (MT) pulse. An off-resonance MT pulse designed under this guide for coronary MR angiography improved the depiction of distal vessels.

References

Aug 1, 1992·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·B S HuA Macovski
Jun 1, 1992·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·G B PikeD R Enzmann
Jun 1, 1991·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·R A Jones, T E Southon
Dec 1, 1991·Radiology·R R EdelmanS Paulin
Apr 1, 1989·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·S D Wolff, R S Balaban
Aug 1, 1985·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·P A BottomleyJ F Schenck
Aug 1, 1995·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·D L ParkerJ S Tsuruda
Jan 1, 1995·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Y WangC A Mistretta
May 1, 1993·Journal of Magnetic Resonance Imaging : JMRI·G B PikeD R Enzmann

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Citations

May 20, 1999·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·D F GochbergJ C Gore
Dec 7, 2000·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·F FranconiJ J Le Jeune
Sep 20, 2002·AJR. American Journal of Roentgenology·Lawrence Yao, Dave Thomasson
Sep 28, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Phillip Zhe SunA Gregory Sorensen
Oct 13, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Christian T StoeckReza Nezafat
Apr 23, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Tae KimSeong-Gi Kim
May 1, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Laura I SacolickMika W Vogel
Jun 20, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Chen LinJohn Huston
Feb 21, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Daniel F Gochberg, John C Gore

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