TY - JOUR
T1 - Assessment of Silent T1-weighted head imaging at 7 T
AU - Costagli, Mauro
AU - Symms, Mark R.
AU - Angeli, Lorenzo
AU - Kelley, Douglas A C
AU - Biagi, Laura
AU - Farnetani, Andrea
AU - Rua, Catarina
AU - Donatelli, Graziella
AU - Tiberi, Gianluigi
AU - Tosetti, Michela
AU - Cosottini, Mirco
PY - 2015/8/29
Y1 - 2015/8/29
N2 - Objectives: This study aimed to assess the performance of a “Silent” zero time of echo (ZTE) sequence for T1-weighted brain imaging using a 7 T MRI system. Methods: The Silent sequence was evaluated qualitatively by two neuroradiologists, as well as quantitatively in terms of tissue contrast, homogeneity, signal-to-noise ratio (SNR) and acoustic noise. It was compared to conventional T1-weighted imaging (FSPGR). Adequacy for automated segmentation was evaluated in comparison with FSPGR acquired at 7 T and 1.5 T. Specific absorption rate (SAR) was also measured. Results: Tissue contrast and homogeneity in Silent were remarkable in deep brain structures and in the occipital and temporal lobes. Mean tissue contrast was significantly (p <0.002) higher in Silent (0.25) than in FSPGR (0.11), which favoured automated tissue segmentation. On the other hand, Silent images had lower SNR with respect to conventional imaging: average SNR of FSPGR was 2.66 times that of Silent. Silent images were affected by artefacts related to projection reconstruction, which nevertheless did not compromise the depiction of brain tissues. Silent acquisition was 35 dB(A) quieter than FSPGR and less than 2.5 dB(A) louder than ambient noise. Six-minute average SAR was
AB - Objectives: This study aimed to assess the performance of a “Silent” zero time of echo (ZTE) sequence for T1-weighted brain imaging using a 7 T MRI system. Methods: The Silent sequence was evaluated qualitatively by two neuroradiologists, as well as quantitatively in terms of tissue contrast, homogeneity, signal-to-noise ratio (SNR) and acoustic noise. It was compared to conventional T1-weighted imaging (FSPGR). Adequacy for automated segmentation was evaluated in comparison with FSPGR acquired at 7 T and 1.5 T. Specific absorption rate (SAR) was also measured. Results: Tissue contrast and homogeneity in Silent were remarkable in deep brain structures and in the occipital and temporal lobes. Mean tissue contrast was significantly (p <0.002) higher in Silent (0.25) than in FSPGR (0.11), which favoured automated tissue segmentation. On the other hand, Silent images had lower SNR with respect to conventional imaging: average SNR of FSPGR was 2.66 times that of Silent. Silent images were affected by artefacts related to projection reconstruction, which nevertheless did not compromise the depiction of brain tissues. Silent acquisition was 35 dB(A) quieter than FSPGR and less than 2.5 dB(A) louder than ambient noise. Six-minute average SAR was
KW - Brain
KW - Magnetic resonance imaging
KW - Neuroimaging
KW - Patient satisfaction
KW - Technology assessment, Biomedical
UR - http://www.scopus.com/inward/record.url?scp=84941338277&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84941338277&partnerID=8YFLogxK
U2 - 10.1007/s00330-015-3954-2
DO - 10.1007/s00330-015-3954-2
M3 - Article
AN - SCOPUS:84941338277
JO - European Radiology
JF - European Radiology
SN - 0938-7994
ER -