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Quantitative study of liver magnetic resonance spectroscopy quality at 3T using body and phased array coils with physical analysis and clinical evaluation.

Xu L, Gu S, Feng Q, Liang C, Xin SX - PLoS ONE (2015)

Bottom Line: The experimental results showed excellent correlations between the paired data (all r > 0.86).Compared with the body coil group, the phased array group had slightly worse shimming effect and better SNR (all P values < .01).No significant differences of the major liver quantitative information of Cho/Lip2 height, Cho/Lip2 area, and lipid content were observed (all P values >0.05).

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Guangdong Provincial Traditional Chinese Medicine Hospital & postdoctoral mobile research station of Guangzhou University of Traditional Chinese Medicine, Guangzhou, Guangdong Province, People's Republic of China.

ABSTRACT
This study aims to investigate the quality difference of short echo time (TE) breathhold 1H magnetic resonance spectroscopy (MRS) of the liver at 3.0T using the body and phased array coils, respectively. In total, 20 pairs of single-voxel proton spectra of the liver were acquired at 3.0T using the phased array and body coils as receivers. Consecutive stacks of breathhold spectra were acquired using the point resolved spectroscopy (PRESS) technique at a short TE of 30 ms and a repetition time (TR) of 1500 ms. The first spectroscopy sequence was "copied" for the second acquisition to ensure identical voxel positioning. The MRS prescan adjustments of shimming and water suppression, signal-to noise ratio (SNR), and major liver quantitative information were compared between paired spectra. Theoretical calculation of the SNR and homogeneity of the region of interest (ROI, 2 cm×2 cm×2 cm) using different coils loaded with 3D liver electromagnetic model of real human body was implemented in the theoretical analysis. The theoretical analysis showed that, inside the ROI, the SNR of the phase array coil was 2.8387 times larger than that of body coil and the homogeneity of the phase array coil and body coil was 80.10% and 93.86%, respectively. The experimental results showed excellent correlations between the paired data (all r > 0.86). Compared with the body coil group, the phased array group had slightly worse shimming effect and better SNR (all P values < .01). The discrepancy of the line width because of the different coils was approximately 0.8 Hz (0.00625 ppm). No significant differences of the major liver quantitative information of Cho/Lip2 height, Cho/Lip2 area, and lipid content were observed (all P values >0.05). The theoretical analysis and clinical experiment showed that the phased array coil was superior to the body coil with respect to 3.0T breathhold hepatic proton MRS.

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Related in: MedlinePlus

PRESS-localized single voxel 1H MR spectrum originating from liver parenchyma of the same ROI using body coil (a) and phased array coil (b); SNR: (b) was better than (a), so the score was marked 1.
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pone.0122999.g002: PRESS-localized single voxel 1H MR spectrum originating from liver parenchyma of the same ROI using body coil (a) and phased array coil (b); SNR: (b) was better than (a), so the score was marked 1.

Mentions: The paired spectra obtained by two coils from the same ROI were compared (assuming A is the spectrum resulting from the phased array coil and B from the body coil). Blind evaluation of the paired spectra was conducted by two radiologists, and the SNR was recorded. When A was similar to, better than, or worse than B, the score was marked 0, 1, or −1, respectively (Fig 2).


Quantitative study of liver magnetic resonance spectroscopy quality at 3T using body and phased array coils with physical analysis and clinical evaluation.

Xu L, Gu S, Feng Q, Liang C, Xin SX - PLoS ONE (2015)

PRESS-localized single voxel 1H MR spectrum originating from liver parenchyma of the same ROI using body coil (a) and phased array coil (b); SNR: (b) was better than (a), so the score was marked 1.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4400076&req=5

pone.0122999.g002: PRESS-localized single voxel 1H MR spectrum originating from liver parenchyma of the same ROI using body coil (a) and phased array coil (b); SNR: (b) was better than (a), so the score was marked 1.
Mentions: The paired spectra obtained by two coils from the same ROI were compared (assuming A is the spectrum resulting from the phased array coil and B from the body coil). Blind evaluation of the paired spectra was conducted by two radiologists, and the SNR was recorded. When A was similar to, better than, or worse than B, the score was marked 0, 1, or −1, respectively (Fig 2).

Bottom Line: The experimental results showed excellent correlations between the paired data (all r > 0.86).Compared with the body coil group, the phased array group had slightly worse shimming effect and better SNR (all P values < .01).No significant differences of the major liver quantitative information of Cho/Lip2 height, Cho/Lip2 area, and lipid content were observed (all P values >0.05).

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Guangdong Provincial Traditional Chinese Medicine Hospital & postdoctoral mobile research station of Guangzhou University of Traditional Chinese Medicine, Guangzhou, Guangdong Province, People's Republic of China.

ABSTRACT
This study aims to investigate the quality difference of short echo time (TE) breathhold 1H magnetic resonance spectroscopy (MRS) of the liver at 3.0T using the body and phased array coils, respectively. In total, 20 pairs of single-voxel proton spectra of the liver were acquired at 3.0T using the phased array and body coils as receivers. Consecutive stacks of breathhold spectra were acquired using the point resolved spectroscopy (PRESS) technique at a short TE of 30 ms and a repetition time (TR) of 1500 ms. The first spectroscopy sequence was "copied" for the second acquisition to ensure identical voxel positioning. The MRS prescan adjustments of shimming and water suppression, signal-to noise ratio (SNR), and major liver quantitative information were compared between paired spectra. Theoretical calculation of the SNR and homogeneity of the region of interest (ROI, 2 cm×2 cm×2 cm) using different coils loaded with 3D liver electromagnetic model of real human body was implemented in the theoretical analysis. The theoretical analysis showed that, inside the ROI, the SNR of the phase array coil was 2.8387 times larger than that of body coil and the homogeneity of the phase array coil and body coil was 80.10% and 93.86%, respectively. The experimental results showed excellent correlations between the paired data (all r > 0.86). Compared with the body coil group, the phased array group had slightly worse shimming effect and better SNR (all P values < .01). The discrepancy of the line width because of the different coils was approximately 0.8 Hz (0.00625 ppm). No significant differences of the major liver quantitative information of Cho/Lip2 height, Cho/Lip2 area, and lipid content were observed (all P values >0.05). The theoretical analysis and clinical experiment showed that the phased array coil was superior to the body coil with respect to 3.0T breathhold hepatic proton MRS.

Show MeSH
Related in: MedlinePlus