TY - JOUR
T1 - Three-dimensional gradient-echo is effective in suppressing radiofrequency shielding by a titanium mesh
AU - Takatsu, Yasuo
AU - Yoshida, Rei
AU - Yamamura, Kenichiro
AU - Yamatani, Yuya
AU - Ueyama, Tsuyoshi
AU - Kimura, Tetsuya
AU - Nohara, Yuriko
AU - Sahara, Tomohiro
AU - Nishiyama, Kengo
AU - Miyati, Tosiaki
N1 - Publisher Copyright:
© 2020 Japanese Society for Magnetic Resonance in Medicine.
PY - 2021
Y1 - 2021
N2 - Purpose: To determine which sequence for frequently used general contrast-enhanced brain MRI shows the least radiofrequency shielding effect of a titanium mesh in cranioplasty using a phantom. Methods: A 1.5T MRI scanner was used. Frequently used general 2D and 3D spin-echo sequences (SE) and T1 spoiled gradient echo sequences (GRE) used for MRI in clinical settings were adopted in this study. A titanium mesh was placed above a cubic phantom containing manganese chloride tetrahydrate and sodium chloride. The signal attenuation ratio and normalized absolute average deviation (NAAD) were calculated. Moreover, the flip angle (FA) dependency in SE and area of excitation dependency in 3D sequences were analyzed using NAAD. Results: The signal attenuation ratio at the position nearest to the titanium mesh for 2D SE was 71.8% larger than that at the position nearest to the titanium mesh for 3D GRE. With regard to NAAD, 3D GRE showed the highest values among the sequences. When FA was increased, radiofrequency shielding effect was improved. There were no significant differences between the narrow and wide area of excitation. 3D GRE showed the least radiofrequency shielding effect, and it was considered as the optimal sequence for MRI in the presence of a titanium mesh. Conclusion: 3D GRE shows the least radiofrequency shielding effect of a titanium mesh after cranioplasty among frequently used general sequences for contrast-enhanced brain MRI.
AB - Purpose: To determine which sequence for frequently used general contrast-enhanced brain MRI shows the least radiofrequency shielding effect of a titanium mesh in cranioplasty using a phantom. Methods: A 1.5T MRI scanner was used. Frequently used general 2D and 3D spin-echo sequences (SE) and T1 spoiled gradient echo sequences (GRE) used for MRI in clinical settings were adopted in this study. A titanium mesh was placed above a cubic phantom containing manganese chloride tetrahydrate and sodium chloride. The signal attenuation ratio and normalized absolute average deviation (NAAD) were calculated. Moreover, the flip angle (FA) dependency in SE and area of excitation dependency in 3D sequences were analyzed using NAAD. Results: The signal attenuation ratio at the position nearest to the titanium mesh for 2D SE was 71.8% larger than that at the position nearest to the titanium mesh for 3D GRE. With regard to NAAD, 3D GRE showed the highest values among the sequences. When FA was increased, radiofrequency shielding effect was improved. There were no significant differences between the narrow and wide area of excitation. 3D GRE showed the least radiofrequency shielding effect, and it was considered as the optimal sequence for MRI in the presence of a titanium mesh. Conclusion: 3D GRE shows the least radiofrequency shielding effect of a titanium mesh after cranioplasty among frequently used general sequences for contrast-enhanced brain MRI.
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U2 - 10.2463/mrms.mp.2019-0180
DO - 10.2463/mrms.mp.2019-0180
M3 - Article
C2 - 32595187
AN - SCOPUS:85107710768
SN - 1347-3182
VL - 20
SP - 182
EP - 189
JO - Magnetic Resonance in Medical Sciences
JF - Magnetic Resonance in Medical Sciences
IS - 2
ER -