Measurement of glutathione in human brain at 3T using an improved double quantum filter in vivo.
A single voxel proton NMR double quantum filter (DQF) for measurement of glutathione (GSH) in human brain at 3T is reported. Yield enhancement for the CH(2) resonances of the cysteine moiety at 2.95ppm has been achieved by means of dual encoding. After the preparation of double quantum and zero quantum coherences (DQC and ZQC) at equal magnitude, the first DQC encoding was followed by interchange of DQC and ZQC, and another DQC encoding. The multi-quantum coherences were fully utilized to generate a GSH target signal at approximately 2.95ppm. The optimal echo time and the editing efficiency were obtained with numerical analysis of the filtering performance and phantom measurements. The dual-DQC encoding method provided GSH yield greater by a factor of 2.1 than single-DQC encoding for identical slice-selective RF pulses in phantom tests. Using the phantom relaxation times and the ratio of edited GSH to N-acetylaspartate (NAA) 2.0-ppm peak areas, the concentration of GSH in the medial parietal cortex of the healthy human brain in vivo was estimated to be 1.0+/-0.3mM (mean+/-SD, n=7), with reference to NAA at 10mM.
Choi
Changho
C
Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390, USA. changho.choi@utsouthwestern.edu
Zhao
Chenguang
C
Dimitrov
Ivan
I
Douglas
Deborah
D
Coupland
Nicholas J
NJ
Kalra
Sanjay
S
Hawesa
Halima
H
Davis
Jeannie
J
D000328:Adult; D000465:Algorithms; D000596:Amino Acids / Q000737:chemistry; D001923:Brain Chemistry; D003545:Cysteine / Q000737:chemistry; D003627:Data Interpretation, Statistical; D005260:Female; D005978:Glutathione / Q000032:analysis* / Q000737:chemistry; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods* / Q000706:statistics & numerical data; D008297:Male; D010296:Parietal Lobe / Q000737:chemistry; D019047:Phantoms, Imaging; D012016:Reference Values; D014867:Water / Q000737:chemistry; D055815:Young Adult
D000596:Amino Acids; D014867:Water; D005978:Glutathione; D003545:Cysteine