In vivo quantitative 1H MRS of cerebellum and evaluation of quantitation reproducibility by simulation of different levels of noise and spectral resolution.
A quantitative analysis of cerebellar metabolites in normal subjects has been performed by proton MR spectroscopy (MRS) with relaxation time correction. Quantitation was carried out in seven healthy human subjects with the well-established LCModel program. The prior knowledge utilized for quantitation was obtained from solutions containing the major brain metabolites and MRS investigated under the same experimental conditions. The tissue water signal was used as an internal standard for the in vivo studies. Both in vitro (for the prior knowledge template) and in vivo data were acquired separately at 1.5 T by PRESS sequence (TR, 1500 ms; TE, 30 ms). The absolute concentration of main cerebellar metabolites was corrected for relaxation time effects. Different noise and line broadening conditions were considered and simulated in the spectral processing in order to evaluate the effect of spectral quality on the concentration estimates.
Macrì
Maria Antonietta
MA
"Enrico Fermi" Center, 00185 Rome, Italy.
Garreffa
Girolamo
G
Giove
Federico
F
Guardati
Manuela
M
Ambrosini
Anna
A
Colonnese
Claudio
C
Maraviglia
Bruno
B
D000328:Adult; D016477:Artifacts; D001224:Aspartic Acid / Q000031:analogs & derivatives* / Q000032:analysis; D001834:Body Water / Q000737:chemistry; D002531:Cerebellum / Q000737:chemistry / Q000378:metabolism*; D002794:Choline / Q000032:analysis; D003401:Creatine / Q000032:analysis; D004151:Dipeptides / Q000032:analysis; D005260:Female; D018698:Glutamic Acid / Q000032:analysis; D005973:Glutamine / Q000032:analysis; D006801:Humans; D006859:Hydrogen; D007089:Image Enhancement / Q000379:methods; D007091:Image Processing, Computer-Assisted / Q000379:methods; D007294:Inositol / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008297:Male; D009479:Neuropeptides / Q000032:analysis
D004151:Dipeptides; D009479:Neuropeptides; D005973:Glutamine; C027172:isospaglumic acid; D001224:Aspartic Acid; D018698:Glutamic Acid; D007294:Inositol; D006859:Hydrogen; C000179:N-acetylaspartate; D003401:Creatine; D002794:Choline