5245288 Magnetic resonance examination apparatus with wireless transmission of spin resonance signals from high frequency coil system processing unit
✍ Scribed by Christoph G Leussler
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 115 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0730-725X
No coin nor oath required. For personal study only.
✦ Synopsis
New Patents circuit. Before the beginning of each read-out sequence, the capacitor is charged to a higher voltage than would be necessary to produce a pure sine oscillation during the read-out sequence. The rise time of the gradient pulse thus produced is less than one-fourth of the duration of the sinusoidal oscillation before the zero-axis crossing, and the decay time is less than onefourth of the duration of the sinusoidal oscillation after the zero-axis crossing. Additionally, a constant part of each gradient pulse is nonresonantly generated by a gradient amplifier. Only the steep parts of the oscillation of the resonant circuit are used for the rising and trailing edges, whereas the flattened part of the sine oscillation is cut off. The rising and trailing edges can thus be noticeably shortened, so that a greater range for the constant gradient value, which can be equidistantly sampled in the kspace is available for the signal evaluation.