Assessment of Silent T1-weighted head imaging at 7 T

Mauro Costagli; Mark R. Symms; Lorenzo Angeli; Douglas A C Kelley; Laura Biagi; Andrea Farnetani; Catarina Rua; Graziella Donatelli; Gianluigi Tiberi; Michela Tosetti; Mirco Cosottini

doi:10.1007/s00330-015-3954-2

Assessment of Silent T1-weighted head imaging at 7 T

Mauro Costagli, Mark R. Symms, Lorenzo Angeli, Douglas A C Kelley, Laura Biagi, Andrea Farnetani, Catarina Rua, Graziella Donatelli, Gianluigi Tiberi, Michela Tosetti, Mirco Cosottini

Fondazione Stella Maris

Research output: Contribution to journal › Article › peer-review

Abstract

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

Original language	English
Journal	European Radiology
DOIs	https://doi.org/10.1007/s00330-015-3954-2
Publication status	Accepted/In press - Aug 29 2015

Keywords

Brain
Magnetic resonance imaging
Neuroimaging
Patient satisfaction
Technology assessment, Biomedical

ASJC Scopus subject areas

Radiology Nuclear Medicine and imaging

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title = "Assessment of Silent T1-weighted head imaging at 7 T",

abstract = "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 ",

keywords = "Brain, Magnetic resonance imaging, Neuroimaging, Patient satisfaction, Technology assessment, Biomedical",

author = "Mauro Costagli and Symms, {Mark R.} and Lorenzo Angeli and Kelley, {Douglas A C} and Laura Biagi and Andrea Farnetani and Catarina Rua and Graziella Donatelli and Gianluigi Tiberi and Michela Tosetti and Mirco Cosottini",

year = "2015",

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day = "29",

doi = "10.1007/s00330-015-3954-2",

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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

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