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| | | | | |  | Searchterm 'Spatial Resolution' was also found in the following services: | | | | |
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From GE Healthcare;
'EXCITE technology has the potential to open the door to new imaging techniques and clinical applications, leaping beyond conventional two and three-dimensional MRI to true 4D imaging that will improve the diagnosis of disease throughout the human body from head to foot.' Robert R. Edelman, M.D., Professor of Radiology at Northwestern University Medical School and Chairman, Department of Radiology, at Evanston Northwestern Healthcare.
Device Information and Specification CLINICAL APPLICATION Whole body Head and body coil standard; all other coils optional; open architecture makes system compatible with a wide selection of coils Optional 2D/3D brain and prostate Standard: SE, IR, 2D/3D GRE and SPGR, Angiography: 2D/3D TOF, 2D/3D Phase Contrast;; 2D/3D FSE, 2D/3D FGRE and FSPGR, SSFP, FLAIR, EPI, optional: 2D/3D Fiesta, FGRET, Spiral, TensorTR 1.3 to 12000 msec in increments of 1 msec TE 0.4 to 2000 msec in increments of 1 msec 2D 0.7 mm to 20 mm; 3D 0.1 mm to 5 mm 128x512 steps 32 phase encode 0.08 mm; 0.02 mm optional POWER REQUIREMENTS 480 or 380/415 less than 0.03 L/hr liquid heliumSTRENGTH SmartSpeed 23 mT/m, HiSpeed Plus 33 mT/m, EchoSpeed Plus 33 mT/m 4.0 m x 2.8 m axial x radial | | | | | |
| | | Searchterm 'Spatial Resolution' was also found in the following service: | | | | |
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From GE Healthcare;
a friendly and less confining appearance targets the 7% of individuals who refuse to have an MRI because of claustrophobia. This open MRI system is also up to three times faster than other scanners, therefore the Signa OpenSpeed™ reducing exam time and scheduling
issues. In addition, a swing table provides better access and supports up to 500 pounds.
Device Information and Specification CLINICAL APPLICATION Whole body Standard: SE, IR, 2D/3D GRE and SPGR, Angiography: 2D/3D TOF, 2D/3D Phase Contrast;; 2D/3D FSE, 2D/3D FGRE and FSPGR, SSFP, FLAIR, EPI, optional: 2D/3D Fiesta, FGRET, Spiral, TensorTR 1.3 to 12000 msec in increments of 1 msec TE 0.4 to 2000 msec in increments of 1 msec 2D: 0.8mm - 20mm 3D: 0.1mm - 20mm 0.08 mm; 0.02 mm optional POWER REQUIREMENTS 200 - 480, 3-phase | | | |
• View the DATABASE results for 'Signa OpenSpeed™' (2).
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From GE Healthcare;
the Signa Ovation™ is a patient-friendly open MRI scanner designed not only to handle a typical patient mix, but to accommodate larger patients, patients who are claustrophobic, and others who have difficulty tolerating the close quarters of conventional MR machines.
Device Information and Specification CLINICAL APPLICATION Whole body Standard: SE, IR, 2D/3D GRE and SPGR, 2D/3D TOF, 2D/3D FSE, 2D/3D FGRE and FSPGR, SSFP, FLAIR, EPI, optional: 2D/3D Fiesta, true chem sat, fat/water separation, single shot diffusion EPI, line scan diffusionIMAGING MODES Localizer, single slice, multislice, volume, fast, POMP, multi slab, cine, slice and frequency zip, extended dynamic range, tailored RF TR 1.3 to 12000 msec in increments of 1 msec TE 0.4 to 2000 msec in increments of 1 msec 2D: 1.4mm - 20mm 3D: 0.2mm - 20mm 0.08 mm; 0.02 mm optional POWER REQUIREMENTS 200 - 480, 3-phase MAX. GRADIENT AMPLITUDE 19 mT/m | | | |
• View the DATABASE results for 'Signa Ovation™' (2).
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From GE Healthcare;
the New Signa Profile/i is a patient friendly open MRI system that virtually eliminates patient anxiety and claustrophobia, without compromising diagnostic utility.
Device Information and Specification CLINICAL APPLICATION Whole body Integrated transmit body coil, body flex sizes: M, L, XL, quadrature, head coil quadrature, 4 channel neurovascular array, 8 channel CTL array, quad. c- spine, 2 channel shoulder array, extremity coil, 3 channel wrist array, 4 channel breast array, 6, 9, 11 inch general purpose loop coils Standard: SE, IR, 2D/3D GRE and SPGR, Angiography: 2D/3D TOF, 2D/3D phase contrast; 2D/3D FSE, 2D/3D FRFSE, FGRE and FSPGR, SSFP, FLAIR, EPI, optional: 2D/3D Fiesta, fat/water separation, T1 FLAIRIMAGING MODES Localizer, single slice, multislice, volume, fast, POMP, multi slab, cine, slice and frequency zip, extended dynamic range, tailored RF TR 6 to 12000 msec in increments of 1 msec TE 1.3 to 2000 msec in increments of 1 msec 2D: 2.7mm - 20mm 3D: 0.2mm - 5mm 0.08 mm; 0.02 mm optional 10,000 kg w/gradient enclosure POWER REQUIREMENTS 200 - 480, 3-phase COOLING SYSTEM TYPE None required | | | |
• View the DATABASE results for 'Signa Profile™' (2).
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| | | Searchterm 'Spatial Resolution' was also found in the following service: | | | | |
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( SNR or S/N) The signal to noise ratio is used in MRI to describe the relative contributions to a detected signal of the true signal and random superimposed signals ('background noise') - a criterion for image quality.
One common method to increase the SNR is to average several measurements of the signal, on the expectation that random contributions will tend to cancel out. The SNR can also be improved by sampling larger volumes (increasing the field of view and slice thickness with a corresponding loss of spatial resolution) or, within limits, by increasing the strength of the magnetic field used. Surface coils can also be used to improve local signal intensity. The SNR will depend, in part, on the electrical properties of the sample or patient being studied.
The SNR increases in proportion to voxel volume (1/resolution), the square root of the number of acquisitions ( NEX), and the square root of the number of scans ( phase encodings). SNR decreases with the field of view squared (FOV2) and wider bandwidths. See also Signal Intensity and Spin Density.
Measuring SNR:
Record the mean value of a small ROI placed in the most homogeneous area of tissue with high signal intensity (e.g. white matter in thalamus). Calculate the standard deviation for the largest possible ROI placed outside the object in the image background (avoid ghosting/aliasing or eye movement artifact regions).
The SNR is then:
Mean Signal/Standard Deviation of Background Noise | | | | | |
• View the DATABASE results for 'Signal to Noise Ratio' (48).
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• View the NEWS results for 'Signal to Noise Ratio' (2).
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