Intracranial microvascular imaging at 7 T MRI with transceiver RF coils |
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Authors: | Chang-Ki Kang Myung-Kyun Woo Suk-Min Hong Young-Bo Kim Zang-Hee Cho |
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Institution: | 1. Neuroscience Research Institute, Gachon University, Incheon, Republic of Korea;2. Department of Radiological Science, College of Health Science, Gachon University, Incheon, Republic of Korea;3. Institute of Neuroscience and Medicine - 4, Forschungszentrum Jülich, Jülich, Germany |
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Abstract: | PurposeTo investigate intracranial microvascular images with transceiver radio-frequency (RF) coils at ultra-high field 7 T magnetic resonance imaging (MRI).Materials and methodsWe designed several types of RF coils for the study of 7 T magnetic resonance angiography and analyzed quantitatively each coil's performance in terms of the signal-to-noise ratio (SNR) profiles to evaluate the usefulness of RF coils for microvascular imaging applications. We also obtained the microvascular images with different resolutions and parallel imaging technique.ResultsThe overlapped 6-channel (ch) transceiver coil exhibited the highest performance for angiographic imaging. Although other multi-channel coils, such as 4- or 8-ch, were also suitable for fast imaging, these coils performed poorly in homogeneity or SNR for angiographic imaging. Furthermore, the 8-ch coil was poor in SNR at the center of the brain, while it had the highest SNR at the periphery.ConclusionThe present study has demonstrated that the overlapped 6-ch coil with large-size loop coils provided the best performance for microvascular imaging or angiography with the ultra-high-field 7 T MRI, mainly because of its long penetration depth together with high SNR. |
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Keywords: | 7 T MRI MRA Microvascular imaging Multi-channel RF coil Parallel imaging |
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