Founded in June 1997, ONI was a privately held company headquartered in Wilmington, Massachusetts. ONI was focused on addressing the new healthcare economics by delivering the next generation of MRI machines: high field, low cost dedicated purpose systems. The company's first offering was the OrthOne™. Further developments lead to the MSK Extreme™, a 1.0 Tesla dedicated purpose MR system with v-SPEC™ Technology and DICOM Conformance for extremity applications.
In October 2009 GE Healthcare bought ONI Medical Systems for US$ 17 Billion.

MRI Scanners:

1.0T:

From Toshiba America Medical Systems Inc.;
OPART™ is a 0.35 T superconducting open MR system featuring cryogenless operation. Superconducting speed and performance are combined with the patient access advantages of open MRI design for unmatched clinical versatility. OPART™ features innovative technologies such as digital RF, high speed gradients and optimized RF coils, which support advanced MRI applications.

This is the point of penetration by the MR system cables into the RF room. This panel contains filters and other connections required to provide communication between the scan room and the rest of the system without allowing interference to pass.

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 (symbol: 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 collaboration 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:

A device that amplifies very low-level signals. A preamplifier is generally placed close to its signal source and has a very low noise figure as it is the principal determinant of electronic noise within the system. Preamplifiers used in NMR systems usually have a 50 ohm input impedance, and require a matching network to interface to the RF coil, although preamplifiers with high input impedance may be used with surface coils. Such devices typically use a field effect transistor (FET) as their input stage.