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March 2022
.Contraindications
There are no specific contraindications for MR Rx coils. However, general contraindications for MRI
The operator should be aware of the following contraindications for use related to
examinations do exist.
the strong magnetic field of the MR system:
•
Scanning is contraindicated for patients who have electrically, magnetically or mechanically activated
implants (cardiac pacemakers, for example). The magnetic and electromagnetic fields produced by
the MR System and coil may interfere with the operations of these devices.
•
Scanning patients with intracranial aneurysm clips is contraindicated.
Basic Operating Principles
This RF coil is designed for use with GE MRI scanners with HD or P-port connectors. The coil receives
magnetic resonance signals generated in hydrogen nuclei (protons) in the human body while blocking the
radio frequency magnetic field applied by the MRI system at specified timings. The received signal is
amplified and transmitted to the MRI system, where it is processed into tomographic images by the
computer.
Target patient groups
The target population for MR
patients that require an MRI exam of the Wrist
Intended users
The MRI is intended for use in a professional healthcare facility environment. The coil is to be used by a
trained MR technician/Radiographer only
Clinical benefits and undesirable side effects
Magnetic resonance images are noninvasive and do not employ ionizing radiation. The technique relies
on a different principle for image production than other imaging techniques. An MR image represents the
relative response of specific nuclei to absorbed radio frequency energy. Similar to other imaging
techniques, this image is a function of density, in this case, the distribution of the nuclei being observed.
However, image contrast is also influenced by other physical factors, including differences in the ability to
re-emit the absorbed radio frequency signal (relaxation), and flow phenomena. This dependence on
multiple parameters means that the information content of an MR image is very different from an X-ray
or ultrasound image.
Most MR images are designed to observe the hydrogen nucleus because of its relative abundance in the
body. Thus, an MR image is usually a tomographic map of the distribution of protons in the imaged
sample. Furthermore, the relative appearance of normal versus pathologic tissue can be modified by
altering specific elements of the acquisition protocol to emphasize different physiochemical
characteristics of specific protons, assuring exceptional tissue contrast across a wide range of tissue
types. The imaging sequences can even be modified to visualize blood flow and to compensate for the
blurring effects of cardiac or respiratory motion.
MR also offers the unique ability to acquire images in virtually any orientation, without repositioning the
patient. This translates into greater convenience for medical staff and minimized patient discomfort. Plus,
Wrist Array coils
used with GE scanners includes adults and pediatric
.
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