Download Magnetic Resonance Imaging of the Brain and Spine (2 Volume by Scott W. Atlas PDF

By Scott W. Atlas

ISBN-10: 078176985X

ISBN-13: 9780781769853

Established because the best textbook on imaging analysis of mind and backbone issues, Magnetic Resonance Imaging of the mind and backbone is now in its Fourth variation. This completely up-to-date two-volume reference promises state of the art info on approximately each point of scientific neuroradiology. professional neuroradiologists, cutting edge well known MRI physicists, and skilled top medical neurospecialists from world wide express how you can generate state of the art photos and outline diagnoses from an important clinical/pathologic MR imaging correlations for neurologic, neurosurgical, and psychiatric illnesses spanning fetal CNS anomalies to issues of the getting older mind. Highlights of this variation contain over 6,800 photos of exceptional caliber, extra colour photos, and new details utilizing complex suggestions, together with perfusion and diffusion MRI and practical MRI. A significant other web site will supply the absolutely searchable textual content and a picture financial institution.

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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.

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