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Articles by A. Henning
Meta-analysis and open-source database for in vivo brain Magnetic Resonance spectroscopy in health and disease
Introduction In vivo MRS can measure levels of metabolites in the brain non-invasively, allowing the abnormal biochemical and cellular processes of disease to be interrogated. The most prominent signals in the 1H spectrum are the methyl singlets associated with N-acetylaspartate/N-acetylaspartylglutamate (tNAA), creatine-containing compounds (tCr), and choline-containing compounds (tCho).
Improvements to dispersed reference interferometry: beyond the linear approximation
Abstract Interferometric instruments with dispersion introduced in the reference arm have previously been created, as the controlled dispersion can be used to generate a signal that contains a clearly identifiable point, the location of which relates to the position of the scattering surface in the measurement arm.
Combination of surface and ‘vertical’ loop elements improves receive performance of a human head transceiver array at 9.4 T
Ultra-high-field (UHF, ?7 T) human magnetic resonance imaging (MRI) provides undisputed advantages over low-field MRI (?3 T), but its development remains challenging because of numerous technical issues, including the low efficiency of transmit (Tx) radiofrequency (RF) coils caused by the increase in tissue power deposition with frequency.
Analytical modeling provides new insight into complex mutual coupling between surface loops at ultrahigh fields
Ultrahigh-field (UHF) (?7 T) transmit (Tx) human head surface loop phased arrays improve both the Tx efficiency (B +/?P) and homogeneity in comparison with single-channel quadrature Tx volume coils. For multi-channel arrays, decoupling becomes one of the major problems during the design process. Further insight into the coupling between array elements and its dependence on various factors can facilitate array development.
Evaluation of transmit efficiency and SAR for a tight fit transceiver human head phased array at 9.4 T
Ultra-high field (UHF, ?7 T) tight fit transceiver phased arrays improve transmit (Tx) efficiency (B +/?P) in comparison with Tx-only arrays, which are usually larger to fit receive (Rx)-only arrays inside. One of the major problems limiting applications of tight fit arrays at UHFs is the anticipated increase of local tissue heating, which is commonly evaluated by the local specific absorption rate (SAR).
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