[논문]Comparison of 1.5T and 3T 1 H MR Spectroscopy for Human Brain Tumors

Kim, Ji-hoon; Chang, Kee-Hyun; Na, Dong Gyu; Song, In Chan; Kim, Seung Ja; Kwon, Bae Ju; Han, Moon Hee

doi:10.3348/kjr.2006.7.3.156

Comparison of 1.5T and 3T 1 H MR Spectroscopy for Human Brain Tumors 원문보기

Korean journal of radiology : official journal of the Korean Radiological Society, v.7 no.3, 2006년, pp.156 - 161

Kim, Ji-hoon (Department of Radiology, Seoul Municipal Boramae Hospital Affiliated to Seoul National University Hospital, Seoul 156-707, Korea.) , Chang, Kee-Hyun (Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea.) , Na, Dong Gyu (Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea.) , Song, In Chan (Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea.) , Kim, Seung Ja (Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea.) , Kwon, Bae Ju (Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea.) , Han, Moon Hee (Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea.)

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ObjectiveWe wanted to estimate the practical improvements of 3T proton MR spectroscopy (1H MRS) as compared with 1.5T 1H MRS for the evaluation of human brain tumors.Materials and MethodsSingle voxel 1H MRS was performed at both 1.5T and 3T in 13 patients suffering with brain tumors. Using the same data acquisition parameters at both field strengths, the 1H MRS spectra were obtained with a short echo time (TE) (35 msec) and an intermediate TE (144 msec) with the voxel size ranging from 2.0 cm3 to 8.7 cm3. The signal to noise ratios (SNRs) of the metabolites (myoinositol [MI], choline compounds [Cho], creatine/phosphocreatine [Cr], N-acetyl-aspartate [NAA], lipid and lactate [LL]) and the metabolite ratios of MI/Cr, Cho/Cr, Cho/NAA and LL/Cr were compared at both TEs between the two field strengths in each brain tumor. The degrees of spectral resolution between the Cho and Cr peaks were qualitatively compared between the two field strengths in each brain tumor.ResultsThe SNRs of the metabolites at 3T demonstrated 49-73% increase at a short TE (p < 0.01) and only 2-12% increase at an intermediate TE (p > 0.05) compared with those of 1.5T. The SNR of inverted lactate at an intermediate TE decreased down to 49% with poorer inversion at 3T (p < 0.05). There was no significant difference in the metabolite ratios between the two field strengths. The degrees of the spectral resolution at 3T were slightly superior to those of 1.5T at a short TE.ConclusionAs compared with 1.5T, 3T 1H MRS demonstrated 49-73% SNR increase in the cerebral metabolites and slightly superior spectral resolution only at a short TE, but little at an intermediate TE, in the brain tumors. There was no significant difference in the metabolite ratios between the two field strengths.

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참고문헌 (13)

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Comparison of 1.5T and 3T 1 H MR Spectroscopy for Human Brain Tumors 원문보기

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