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Result : Searchterm 'Solenoid' found in 4 terms [] and 11 definitions []
| previous 11 - 15 (of 15) Result Pages : [1] [2 3] | | | | | | |
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A coil, or antenna, positioned within the imaging volume and connected to the receiver circuitry that is used to detect or receive the MR signal from the patient as the disturbed spins relax back into their equilibrium distribution. Also called receive-only coil.
Special-purpose coils are designed to optimize the SNR from a given region of the body. State-of-the-art coil systems include the use of four or more coils with four separate receivers. This method is often referred to as a phased array system.
Receiver coil types include also solenoid, planar, volume and quadrature coils.
The quality of the MR images depends on the SNR of the acquired signal
from the patient. SNR is of the utmost importance in obtaining clear images of the interior of the human body. | | | | | | | | | |
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A surface coil is essentially a loop of conducting material, such as copper tubing. The in-bore solenoidal sending coil is used as the transmitter of RF energy. This type of receiver coil is placed directly on or over the region of interest for increased magnetic sensitivity. The loop may form various shapes and be bent slightly to conform to the imaged body part. Surface coils have a good SNR for tissues adjacent to the coil and because the signal decrease with the distance, an eligibility homogeneity correction will equalize this over the field of view. A rule of thumb for surface coils is that the sensitivity decreases appreciably beyond a distance equal to the diameter of the coil.
The positioning of the coil is an important determinant of performance. As only the region close to the surface coil will contribute to the signal, there is an improvement in the SNR for these regions, compared to the use of receiver coils that surround the appropriate part of the body. These coils are specifically designed for localized body regions, and provide improved signal to noise ratios by limiting the spatial extent of the excitation or reception.
See also the related poll result: ' 3rd party coils are better than the original manufacturer coils' | | | | • View the DATABASE results for 'Surface Coil' (81).
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From Toshiba America Medical Systems Inc.;
the Ultra™ system was developed to help healthcare providers be more competitive by delivering greater patient comfort and a broad range of clinical capabilities, says Anita Bowler, product manager, MRI Business Unit, Toshiba America Medical Systems Inc With its unique, powerful gradient technology, the Ultra™ performs advanced clinical studies and consistently provides high-resolution images that are typically associated with high field MRI systems. At the same time, the Ultra™ offers a truly open feeling that makes patients more relaxed, especially those with claustrophobic tendencies.
Device Information and Specification CLINICAL APPLICATION Whole Body Quadrature, solenoid and multi-channel configurations SE, FE, IR, FastSE, FastIR, FastFLAIR, Fast STIR, FastFE, FASE, Hybrid EPI, Multi Shot EPI, Single shot EPI diffusion, True SSFP, SuperFASE; Angiography: 2D(gate/non-gate)/3D TOF, SORS-STC, Black Blood MRA POWER REQUIREMENTS 380/400/415/440/480 V COOLING SYSTEM TYPE Cryogenless | | | | | |
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From FONAR Corporation;
in October of 2004, the company changed the product name of the Stand-Up™ MRI to the Upright™ MRI. The Indomitable™, Upright™ MRI is the only open MRI in the world that can perform positional MRI (pMRI), i.e. the Upright MRI™ scans patients in upright, weight-bearing positions, in addition to the conventional lie-down positions. The Upright™ MRI is the only device that can scan patients in the position their symptoms occur, in their position of pain. In early clinical reports independently confirm the effectiveness and potential of positional MRI. In October 2000, Fonar received permission to market the Indomitable™ from the FDA.
Device Information and Specification CLINICAL APPLICATION Whole body -
weight-bearing MRI -
position imaging (flexion, extension, bending, standing, sitting and recumbent scanning)
CONFIGURATION Front-open and Top-open MRIPOWER REQUIREMENTS 380/400/415/440/480 V COOLING SYSTEM TYPE Water, closed-loop | | | | • View the DATABASE results for 'Upright™ MRI' (5).
| | | • View the NEWS results for 'Upright™ MRI' (9).
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From Toshiba America Medical Systems Inc.;
VISART™ series is a 1.5 Tesla superconducting MRI system that has been designed to meet the expanding role of MRI in today's clinical environment. The system utilizes innovative technologies such as digital RF, high speed actively shielded gradients and optimized RF coils, which support a wide range of MRI developments. The Visart, an early type of Toshiba Medical Systems Inc., can be retrofitted or upgraded to the Excelart configuration.
Device Information and Specification CLINICAL APPLICATION Whole body Quadrature, solenoid and multi-channel configurations SE, FE, IR, FastSE, FastIR, FastFLAIR, Fast STIR, FastFE, FASE, Hybrid EPI, Multi Shot EPI; Angiography: 2D(gate/non-gate)/3D TOF, SORS-STC IMAGING MODES Single, multislice, volume study POWER REQUIREMENTS 380/400/415/440/480 V COOLING SYSTEM TYPE Closed-loop water-cooled | | | | • View the DATABASE results for 'VISART™' (2).
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