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Result : Searchterm 'Radio Frequency Coil' found in 1 term [ ] and 8 definitions [ ], (+ 15 Boolean[ ] results
| previous 11 - 15 (of 24) nextResult Pages : [1] [2] [3 4 5] |  | |  | Searchterm 'Radio Frequency Coil' was also found in the following service: | | | | |
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From Siemens Medical Systems;
Received FDA clearance in 2007.
The MAGNETOM Essenza is designed to combine high system performance with simple installation and power requirements to provide optimal operating costs for limited budgets. The standard system has up to 25 integrated coil elements and 8 independent radio frequency channels. Tim allows the combination of up to 4 different coils that reduce patient and coil repositioning.
The 1.5 Tesla system is designated for a complete range of clinical applications, including neurology, orthopedics, body imaging, angiography, cardiology, breast imaging, oncology and pediatric MRI.
Device Information and Specification
CLINICAL APPLICATION
Whole body
CONFIGURATION
Ultra-short bore
Head, spine, torso/ body coil, neurovascular, cardiac, neck, and multi-purpose flex coils. Peripheral vascular, breast, shoulder, knee, wrist, foot//ankle, TMJ optional.
CHANNELS (min. / max. configuration)
8, 16
MAGNET WEIGHT (gantry included)
4350 kg in operation
DIMENSION H*W*D (gantry included)
145 x 226 x 216 cm
COOLING SYSTEM
Water; single cryogen, 2 stage refrigeration
30 mT/m, 300 msec to 10 mT/m
Passive, active; first order standard
second order optional
POWER REQUIREMENTS
380 / 400 / 420 / 440 / 460 / 480 V, 3-phase + ground; 45 kVA
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From Siemens Medical Systems;
Received FDA clearance in 2010.
The MAGNETOM Aera is a patient friendly, comfortable 1.5 Tesla MRI system with advanced radio frequency chain.
The system is equipped with the Tim 4G and Dot system (Total imaging matrix + Day optimizing throughput), to enhance both productivity and image quality.
Tim 4G technology provides improved SNR. The standard system configuration of 48 radio frequency channels and 204 coil elements creates an imaging matrix that allows maximum use of coil elements at full field of view. Dot provides improved image consistency through new features like auto align, auto FoV and automatic bolus detection.
Device Information and Specification
CLINICAL APPLICATION
Whole body
Head, spine, torso/ body coil, neurovascular, cardiac, neck, shoulder, knee, wrist, foot//ankle and multi-purpose flex coils. Peripheral vascular, breast, shoulder. Up to 60% more SNR with Tim 4G.
CHANNELS (min. / max. configuration)
48, 64
MINIMUM TE
3-D GRE: 0.22 (256 matrix), Ultra-short TE
At isocenter: L-R 70 cm, A-P (with table) 55 cm
MAGNET WEIGHT (gantry included)
3121 kg
DIMENSION H*W*D (gantry included)
145 x 231 x 219 cm
MAX. AMPLITUDE
33 or 45 mT/m
3 linear with 20 coils, 5 nonlinear 2nd-order
POWER REQUIREMENTS
380 / 400 / 420 / 440 / 460 / 480 V, 3-phase + ground; 85 kVA
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From Siemens Medical Systems;
Received FDA clearance in 2012.
The MAGNETOM Spectra is a cost-optimized high field MRI system with Tim 4G and Dot technologies. The system consumes less energy compared to other 3 Tesla scanners. The magnet-cooling helium is contained in a closed loop, which prevents the gas from escaping and reduces the need for refills. TimTX includes innovative techniques in the radio frequency excitation hardware as well as new application and processing features enabling uniform RF distribution in all body regions.
Device Information and Specification
CLINICAL APPLICATION
Whole Body
Head, spine, torso/ body coil, neurovascular, neck and multi-purpose flex coils. Peripheral vascular, breast, shoulder, knee, wrist, foot//ankle, endorectal optional.
Chemical shift imaging, single voxel spectroscopy
DIMENSION H*W*D (gantry included)
173 x 231 x 219 cm
COOLING SYSTEM
Water; single cryogen, 2 stage refrigeration
Passive, active; first order standard, second order optional
POWER REQUIREMENTS
380 / 400 / 420 / 440 / 460 / 480 V, 3-phase + ground; connection value with chiller 100 kvA /without chiller 60 kVA
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From Siemens Medical Systems;
Received FDA clearance in 2007.
The MAGNETOM Verio provides up to 102 integrated matrix coil elements and up to 32 independent radiofrequency channels that allow flexible coil combinations to make patient and coil repositioning virtually unnecessary. The Tim (total imaging matrix) technology also increases patient throughput due to a shorter scan time.
The open bore design offers great comfort for patients of all shapes and sizes.
Device Information and Specification
CLINICAL APPLICATION
Whole Body
CONFIGURATION
Ultra-short open bore
Head, spine, torso/ body coil, neurovascular, cardiac, neck and multi-purpose flex coils. Peripheral vascular, breast, shoulder, knee, wrist, foot//ankle, TMJ optional.
CHANNELS (min. / max. configuration)
8, 18, 32
Chemical shift imaging, single voxel spectroscopy
MAGNET WEIGHT (gantry included)
8200 kg
DIMENSION H*W*D (gantry included)
173 x 230 x 222 cm
Passive, active; first order,
second order standard
POWER REQUIREMENTS
380 / 400 / 420 / 440 / 460 / 480 V, 3-phase + ground; 110 kVA
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(SAR) The Specific Absorption Rate is defined as the RF power absorbed per unit of mass of an object, and is measured in watts per kilogram (W/kg).
The SAR describes the potential for heating of the patient's tissue due to the application of the RF energy necessary to produce the MR signal. Inhomogeneity of the RF field leads to a local exposure where most of the absorbed energy is applied to one body region rather than the entire person, leading to the concept of a local SAR. Hot spots may occur in the exposed tissue, to avoid or at least minimize effects of such theoretical complications, the frequency and the power of the radio frequency irradiation should be kept at the lowest possible level. Averaging over the whole body leads to the global SAR.
It increases with field strength, radio frequency power and duty cycle, transmitter- coil type and body size. The doubling of the field strength from 1.5 Tesla (1.5T) to 3 Tesla ( 3T) leads to a quadrupling of SAR. In high and ultrahigh fields, some of the multiple echo, multiple-slice pulse sequences may create a higher SAR than recommended by the agencies. SAR can be reduced by lower flip angle and longer repetition times, which could potentially affect image contrast.
Normally no threatening increase in temperature could be shown. Even in high magnetic fields, the local temperature increases not more than 1°C. 2.1°C is the highest measured increase in skin temperature. Eddy currents may heat up implants and thus may cause local heating.
FDA SAR limits:
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Whole body: 4W/kg/15-minute exposure averaged;
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Head: 3W/kg/10-minute exposure averaged;
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Head or torso: 8W/kg/5 minute exposure per gram of tissue;
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Extremities: 12W/kg/5 minute exposure per gram of tissue.
IEC (International Electrotechnical Commission) SAR limits of some European countries:
All limits are averaged over 6 minutes.
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Level 0 (normal operating mode): Whole body 2W/kg; Head 3.2W/kg; Head or Torso (local) 10W/kg;
Extremities (local) 20W/kg;
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Level I (first level controlled operating mode): Whole body 4W/kg; Head 3.2W/kg; Head or Torso (local) 10W/kg; Extremities (local) 20W/kg;
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Level II (second level controlled operating mode): All values are over Level I values.
(For more details: IEC 60601-2-33 (2002))
In most countries standard MRI systems are limited to a maximum SAR of 4 W/kg, so most scanning in level II is impossible.
For Level I, in addition to routine monitoring, particular caution must be exercised for patients who are sensitive to temperature increases or to RF energy.
For Japan different SAR limits are valid. | |  | | • View the DATABASE results for 'Specific Absorption Rate' (8).
| | | • View the NEWS results for 'Specific Absorption Rate' (1).
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