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We reveal that the unique properties of ultrathin metasurface resonators can improve dramatically magnetic resonance imaging (MRI). We place a metasurface formed by an array of metallic wires inside a scanner under the studied object and achieve a substantial enhancement of the radiofrequency magnetic field by means of subwavelength near-field manipulation with metasurface, also allowing to improve...
The electromagnetic (EM) simulation guided design and operation of a receive-only liquid nitrogen (LN2) cooled coil suitable for medical imaging on a 3-T whole body MR scanner is presented. This process is easier and more cost-effective than building a range of coils. The performance of the designed probe was evaluated by comparison of signal-to-noise ratio (SNR) with the same radio-frequency (RF)...
Energy metabolism rates have been hypothesized to reflect abnormalities in diseases such as heart failure and diabetes. Using magnetic resonance imaging (MRI) technology, these rates can be imaged in multiple locations in the body. Due to similarities in muscle striations between myocardial and skeletal tissues, the metabolism of these substances will be imaged in the leg in order to increase patient...
A Bi-2223 surface RF coil was developed for a 0.3T permanent MRI system to achieve better signal-to-noise ratio (SNR) of images. Based on the finite element method (FEM), the SNR of a copper-made surface coil is analyzed, and the emphasis is put on the coil self-resistance that accounts for much higher percentage of the equivalent noise resistance in low field MRI than that in high field MRI. In order...
Magnetic resonance imaging (MRI) may be viewed as a two-stage experiment that yields a non-invasive spatial mapping of hydrogen nuclei in living subjects. Nuclear spins within a subject are first excited using a radio-frequency (RF) excitation pulse and proportions of excited spins are then detected using a resonant coil; images are then reconstructed from this data. Excitation pulses need to be tailored...
The authors have developed an imaging modality called the magic angle rotating frame method. This modality uses a signal-to-noise ratio comparable to that of standard methods. The authors have demonstrated the possibility of using their method to obtain spatial information on a 20-kHz bandwidth system. They have used paramagnetic tracers to emphasize relaxation time contrast and selecting certain...
Baseline removal by subtraction, in which each second-excitation RF pulse changes its polarity, can be successfully used in a variety of data processing applications in real time by appropriately coding the odd and even excitations. The authors demonstrate this technique in: (1) fast fat/water imaging utilizing phase modulation of the spectral components and (2) the detection of lactate in vivo by...
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