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Parts: MRI, GE Healthcare, Mobile Signa MR/i 1.5T

 
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Manufacturer : GE Healthcare

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Model : Mobile Signa MR/i 1.5T

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6103778109

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Device: Mobile MRI
Manufacturer: GE Healthcare
Model: Mobile Signa MR/i 1.5T
Name / Number: P.S. / 2317092
Location: France, Alsace
Business type: Service Company
Negotiable
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Page: 1 2 3

MRI may also be referred to as :

Scanning System, Magnetic Resonance Imaging | Scanner, Nuclear Magnetic Resonance (NMR) | Open MRI Unit | Nuclear Magnetic Resonance Imaging System | Nuclear Magnetic Resonance (NMR) Unit | NMR | MRI Unit | MRI System | Magnetic Resonance Imaging System | Magnetic Resonance Imaging (MRI) Unit | Computerized MRI Tomograph | Accessible MRI Unit

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Tips for buying MRI Parts

MRI’s used for medical imaging contain a number of MRI parts which are assembled and connected together to form an MRI system. The MRI parts are very unique and therefore, quite different from the recognized parts used for x-ray, CT and ultrasound.

MRI uses properties of hydrogen atoms to distinguish between different tissues within the human body. The human body is composed primarily of hydrogen atoms (63%). Other elements are oxygen (26%), carbon (9%), nitrogen (1%) and relatively small amounts of phosphorous, calcium, and sodium. MRI uses a property of atoms called “spin” to distinguish differences between tissues such as muscle, fat and tendon.

With a patient in a MRI machine, and the magnet turned on, the nuclei of the hydrogen atoms are inclined to spin in one of two directions. These hydrogen atom nuclei can transition their spin orientation, or precess, to the opposite orientation. In order to spin in the other direction, a coil emits a radiofrequency (RF) that causes this transition (the frequency of energy required to make this transition is specific, and called the Larmour Frequency).

The signal that is used in creating MRI images is derived from the energy released by molecules transitioning, or precessing, from their high-energy to the low-energy state. This exchange of energy between spin states is called resonance, and as a result it is known as magnetic resonance imaging.

To understand how all MRI parts work together, it is necessary to present the main MRI parts, one by one and to explain the principal of operation:

1. The primary magnet is the largest and the most important of all of the MRI Parts. A permanent magnet powerful enough to use in a MRI would be too costly to produce and too awkward to store. The other way to make a magnet is to coil electrical wire and run a current through it, creating a magnetic field within the center of the coil. In order to create a strong enough magnetic field to perform MRI, the coils of the wire must have no resistance. Therefore they are bathed in liquid helium and a temperature close to absolute zero. The primary magnet is always the most expensive.

2. The next MRI part in line of importance is the magnetic gradient assembly:
There are three smaller magnets within an MRI machine called gradient magnets. These magnets are much smaller than the primary magnet, but they allow the magnetic field to be altered very precisely.  It is these gradient magnets that allow image “slices” of the body to be created. By altering the gradient magnets, the magnetic field can be specifically focused on a selected part of the body. The quality of the MRI image depends mainly on the quality of these magnetic MRI parts.

3. The gradient coils are driven by yet another MRI part – the gradient amplifiers assembly. This MRI part is usually heavily loaded and should be very carefully operated.

4. The next type of MRI parts to consider are the radio frequency MRI parts, more specifically, the transmitter and the receivers assembly. The transmitter outputs high power radio frequency pulses which effect the spin orientation and increase the energy state of the hydrogen nuclei. Consequently, when the spins return to their initial state, radio energy is emitted and the signal is fed into the one receiver assembly, which is a very complex and sophisticated MRI part.

5. The coupling of the exitation RF energy to the human body is by the transmitting coil(s).  The tiny MRI signal is also picked up by a coil. A coil is an MRI part specially designed for the anatomic site which is being imaged. The meaning of the word “coil” usually refers to a set of coils which feed different receivers. Each coil is a different and integral MRI part which can be switched into the system as indicated.

6. The last, but still highly significant MRI part, is the computer system:
The computer system interprets the data and creates images that display the different resonance characteristics of different tissue types. We see this as an image in various shades of grey, with some body tissues showing up darker or lighter, depending on the interaction of all of the above processes.