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Heavy loading, strong RF loss and the skin effect complicate MR investigations in electric conductive, dielectric media. A setup was developed for MR studies on swimming marine fish that reduces these limitations. A birdcage resonator adapted to high loadings was used for signal excitation. An insulated inductive coil (2 cm diameter) was fixed onto the fish(More)
An experimental implementation and first performance analysis of parallel spatially selective excitation with an array of transmit coils and simultaneous transmission of individual waveforms on multiple channels is presented. This technique, also known as Transmit SENSE, uses the basic idea of parallel imaging to shorten the k-space trajectories that(More)
A technique for noninvasively quantifying the concentration of sodium ((23) Na) ions was applied to the study of ischemic stroke. (23) Na-magnetic resonance imaging techniques have shown considerable potential for measuring subtle changes in ischemic tissue, although studies to date have suffered primarily from poor signal/noise ratio. In this study,(More)
Introduction: Phased arrays of loop surface coils or planar strip arrays [1] have been introduced to acquire conventional and parallel spatial encoded MRI imaging in the past. So-called current sheet antennas (CSA) have been commonly used as hyperthermia applicators applying the RF electric field to heat body tissues. The main problem impeding a wide use of(More)
Introduction: In-vivo MR imaging on humans and animals is often affected by flow and motion of nuclear spins causing blurring and ghosting artifacts [1]. If these moving spins are not of direct investigational interest their effects need to be suppressed or compensated efficiently. For this purpose a variety of techniques has been developed, like(More)
In this work we present the design of a small animal PET based on 8 high-density arrays of MPPCs and monolithic scintillators. The MPPCs arrays are composed of 16x16 TSV-type (3x3 mm 2) elements covering a rough active area of 5x5 cm 2. A single LYSO block with a thickness of 10mm has been mounted on each detector. Black paint has been applied to the(More)
The purpose of this study was to develop a practical magnetic resonance imaging (MRI) scheme for the latest rotating radiofrequency coil (RRFC) design at 9.4 T. The new prototype RRFC was integrated with an optical sensor to facilitate recording of its angular positions relative to the sequence timing. In imaging, the RRFC was used together with radial(More)
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