The sensitivity of low flip angle RARE imaging

It is demonstrated that the stability of the Carr‐Purcell‐Mei‐boom‐Gill (CPMG) sequence reflects the existence of a steady state solution to the Bloch equations in the absence of T2 and T1 decay. The steady state theory is then used to evaluate the performance of low flip angle RARE imaging sequences with both constant and optimally varied refocusing flip angles. The theory is experimentally verified in phantoms and then optimized, single shot, low flip angle RARE is used to obtain artifact‐free images from the brain of a normal volunteer.

[1]  E. T. Jaynes,et al.  MATRIX TREATMENT OF NUCLEAR INDUCTION , 1955 .

[2]  E. Purcell,et al.  Effects of Diffusion on Free Precession in Nuclear Magnetic Resonance Experiments , 1954 .

[3]  F A Jolesz,et al.  Partial RF echo planar imaging with the FAISE method. I. Experimental and theoretical assessment of artifact , 1992, Magnetic resonance in medicine.

[4]  P. Mansfield,et al.  BIOLOGICAL AND MEDICAL IMAGING BY NMR , 1979 .

[5]  S. Meiboom,et al.  Modified Spin‐Echo Method for Measuring Nuclear Relaxation Times , 1958 .

[6]  R. R. Ernst,et al.  Application of Fourier Transform Spectroscopy to Magnetic Resonance , 1966 .

[7]  D. Norris,et al.  On the application of ultra‐fast rare experiments , 1992, Magnetic resonance in medicine.

[8]  D. Feinberg,et al.  GRASE (Gradient‐and Spin‐Echo) imaging: A novel fast MRI technique , 1991, Magnetic resonance in medicine.

[9]  J. Hennig.  Multiecho imaging sequences with low refocusing flip angles , 1988 .

[10]  J Hennig,et al.  RARE imaging: A fast imaging method for clinical MR , 1986, Magnetic resonance in medicine.

[11]  F A Jolesz,et al.  Partial RF echo‐planar imaging with the FAISE method. II. Contrast equivalence with spin‐echo sequences , 1992, Magnetic resonance in medicine.

[12]  R C Grimm,et al.  Initial clinical experience in MR imaging of the brain with a fast fluid-attenuated inversion-recovery pulse sequence. , 1994, Radiology.

[13]  F A Jolesz,et al.  T2‐weighted thin‐section imaging with the multislab three‐dimensional RARE technique , 1991, Journal of magnetic resonance imaging : JMRI.

[14]  R V Mulkern,et al.  Magnetization transfer effects in multislice RARE sequences , 1992, Magnetic resonance in medicine.

[15]  B. Kiefer,et al.  Cholangiography before biliary surgery: single-shot MR cholangiography versus intravenous cholangiography. , 1996, Radiology.

[16]  R. S. Hinks,et al.  Stabilization of echo amplitudes in FSE sequences , 1993, Magnetic resonance in medicine.

[17]  A. Haase,et al.  Snapshot flash mri. applications to t1, t2, and chemical‐shift imaging , 1990, Magnetic resonance in medicine.

[18]  J. Frahm,et al.  Diffusion imaging of the human brain in vivo using high‐speed STEAM MRI , 1992, Magnetic resonance in medicine.

[19]  Glyn Johnson,et al.  Increased flexibility in GRASE imaging by k space‐banded phase encoding , 1995, Magnetic resonance in medicine.

[20]  Glyn Johnson,et al.  GRASE Improves Spatial Resolution in Single Shot Imaging , 1995, Magnetic resonance in medicine.

[21]  L P Panych,et al.  Comparing the FAISE method with conventional dual‐echo sequences , 1991, Journal of magnetic resonance imaging : JMRI.