By Scott W. Atlas
ISBN-10: 078176985X
ISBN-13: 9780781769853
Read Online or Download Magnetic Resonance Imaging of the Brain and Spine (2 Volume Set) PDF
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Additional resources for Magnetic Resonance Imaging of the Brain and Spine (2 Volume Set)
Example text
The resonance module consists of the hardware of the gradient coils and the radiofrequency (RF) coils. Digital synchronization is provided for the receive signal analog-to-digital converter, such that the detected signal samples correlate with the applied gradient and RF signals. The temporal positional accuracy and repeatability (TPAR) of the digital signals is an important system consideration. 1â to 1-µs update interval with 10-ns TPAR In addition to the RF, gradient, and digital signals, additional outputs may be used to drive resistive magnet shims to correct homogeneity or to provide scan-specific corrections.
Therefore, any current in one coil tends to excite strong currents in the other coil. This interaction can also be blocked by the appropriate use of crossed diodes and coaxial cables (76). If coil decoupling is not dealt with properly, both the transmit and receive portions of the imaging sequence can be unsatisfactory. 10. Birdcage resonator. A head coil designed to operate at 170 MHz corresponding to the proton resonant frequency at 4 T. Normally, only two of the four inputs would be driven. Driving two adjacent ports with equal signals 90 degrees out of phase produces a circularly polarized field.
Coils of this size are needed to admit the human body and to produce the gradient field linearity necessary for whole-body imaging. 012 G/cm per ampere of drive current. 3 G/cm in 250 µs. 2 G/cm/ms. The power supply must then be capable of driving the coil current from 0 to roughly 275 A in this short time. 3 kW. This power dissipation produces thermal heating of the coil and may require water-cooling if they duty cycle of the pulse sequence is high. Water-cooling reduces the temperature rise but adds additional reliability considerations of the system.