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| | | | | | | Searchterm 'HIS' was also found in the following services: | | | | |
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| | | | • View the NEWS results for 'Berlex Laboratories, Inc.' (1).
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| | | | | | • View the DATABASE results for 'Bipolar Gradient Pulse' (7).
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A RF coil, often a transmit receive coil with a number of wires running along the z-direction, arranged to give a cosine current variation around the circumference of the coil, which looks like a bird cage.
The bird cage coil works on a different principle to conventionally tuned local and surround coils in that it behaves like a tuned transmission line with one complete cycle of standing wave around the circumference. The frequency supply is generated by an oscillator, which is modulated to form a shaped pulse by a product detector controlled by the waveform generator. The signal must be amplified to 1000's of watts. T his can be done using either solid state electronics, valves or a combination of both.
The bird cage coil design provides the best field homogeneity of all RF imaging coils.
One advantage is that it is simple to produce an exceedingly uniform B1 radio frequency field over most of the coil's volume, with the result of images with a high degree of uniformity.
A second advantage is that nodes with zero voltage occur 90° away from the driven part of the coil, thus facilitating the introduction of a second signal in quadrature, which produces a circularly polarized radio frequency field.
T his type of volume coil is used for brain (head) MRI, or MR imaging of joints, such as the wrist or knees.
See also the related poll result: ' 3rd party coils are better than the original manufacturer coils' | | | | | | • View the DATABASE results for 'Bird Cage Coil' (4).
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| | | Searchterm 'HIS' was also found in the following services: | | | | |
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| | | | • View the DATABASE results for 'Blood Pool Agents' (16).
| | | • View the NEWS results for 'Blood Pool Agents' (1).
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Device Information and Specification
CLINICAL APPLICATION
Dedicated extremity
SE, GE, IR, STIR, FSE, 3D CE, GE-STIR, 3D GE, ME, TME, HSE
IMAGING MODES
Single, multislice, volume study, fast scan, multi slab
2D: 2 mm - 10 mm;
3D: 0.6 mm - 10 mm
4,096 gray lvls, 256 lvls in 3D
POWER REQUIREMENTS
100/110/200/220/230/240
| | | | • View the DATABASE results for 'C-SCAN™' (4).
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