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Philips Medical System is the diagnostics business of Royal Philips Electronics of the Netherlands, one of the world's biggest electronics companies and Europe's largest. Philips is quoted on the NYSE (sym bol: PHG), London, Frankfurt, Amsterdam and other stock exchanges.
On October 19, 2001, Philips Medical Systems completed a 3-year acquisition strategy through its purchase of Marconi Medical Systems. Marconi Medical Systems offered leading multislice CT, MRI, and Nuclear Gamma Camera systems to medical institutions around the world. As well as new 3.0T developments, Philips is also in colla boration with researchers at the University of Nottingham, with the intention of developing an ultrahigh field strength clinical 7.0T whole body MR system.
MRI Scanners:
0.23T to 1.0T:
1.5T:
3.0T to 7.0T:
Hybrid Scanners:
Contact Information MAIL Philips Medical Systems
3000 Minuteman Road
Andover, MA 01810-1099
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( STIR) Also called Short Tau ( t) ( inversion time) Inversion Recovery. STIR is a fat suppression technique with an inversion time t = T1 ln2 where the signal of fat is zero ( T1 is the spin lattice relaxation time of the component that should be suppressed). To distinguish two tissue components with this technique, the T1 values must be different. Fluid Attenuation Inversion Recovery ( FLAIR) is a similar technique to suppress water.
Inversion recovery doubles the distance spins will recover, allowing more time for T1 differences. A 180° preparation pulse inverts the net magnetization to the negative longitudinal magnetization prior to the 90° excitation pulse.
This specialized application of the inversion recovery sequence set the inversion time ( t) of the sequence at 0.69 times the T1 of fat. The T1 of fat at 1.5 Tesla is approximately 250 with a null point of 170 ms while at 0.5 Tesla its 215 with a 148 ms null point. At the moment of excitation, a bout 120 to 170 ms after the 180° inversion pulse (depending of the magnetic field) the magnetization of the fat signal has just risen to zero from its original, negative, value and no fat signal is available to be flipped into the transverse plane.
When deciding on the optimal T1 time, factors to be considered include not only the main field strength, but also the tissue to be suppressed and the anatomy. In comparison to a conventional spin echo where tissues with a short T1 are bright due to faster recovery, fat signal is reversed or darkened.
Because body fluids have both a long T1 and a long T2, it is evident that STIR offers the possibility of extremely sensitive detection of body fluid. This is of course, only true for stationary fluid such as edema, as the MRI signal of flowing fluids is governed by other factors.
See also Fat Suppression and Inversion Recovery Sequence. | | | |  | | • View the DATABASE results for 'Short T1 Inversion Recovery' (3).
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From GE Healthcare;
The GE Signa HDx MRI system is a whole body magnetic resonance scanner designed to support high resolution, high signal to noise ratio, and short scan times.
The 1.5T Signa HDx MR Systems is a modification of the currently marketed GE 1.5T machines, with the main difference being the change to the receive chain architecture that includes a thirty two independent receive channels, and allows for future expansion in 16 channel increments. The overall system has been improved with a simplified user interface
and a single 23" liquid crystal display, improved multi channel surface coil connectivity, and an improved image reconstruction architecture known as the Volume Recon Engine (VRE).
Device Information and Specification CLINICAL APPLICATION Whole body CONFIGURATION Compact short bore 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, Tensor, 2D 0.7 mm to 20 mm; 3D 0.1 mm to 5 mm 128x512 steps 32 phase encode POWER REQUIREMENTS 480 or 380/415 less than 0.03 L/hr liquid helium | |  | | | |
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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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From GE Healthcare;
The Signa SP 0.5T™ is an open MRI magnet that is designed for use in interventional radiology and intra-operative imaging. The vertical gap configuration increases patient positioning options, improves patient observation, and allows continuous access to the patient during imaging.
The magnet enclosure also incorporates an intercom, patient observation video camera, laser patient alignment lights, and task lighting in the imaging volume.
Device Information and Specification CLINICAL APPLICATION Whole body Integrated transmit and receive body coil; optional rotational body coil, head; other coils optional; open architecture makes system compatible with a wide selection of coilsarray 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 IMAGING 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 POWER REQUIREMENTS 200 - 480, 3-phase | |  | | • View the DATABASE results for 'Signa SP 0.5T™ Open Configuration' (2).
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