Glossary; Specific Absorption Rate (Sar) - Boston Scientific WaveWriter Alpha Manual Del Usuario

Glossary

Glossary
Hertz (Hz) – a unit of frequency in Hertz or cycles per second. One Megahertz (MHz) is one million cycles
per second.
MR Conditional – an item with demonstrated safety in the MR environment within defined conditions.
3
At a minimum, these address the conditions of the static magnetic field, the switched gradient magnetic
field and the radiofrequency fields. Additional conditions, including specific configurations of the item, may
be required.
MRI – Magnetic Resonance Imaging.
MRI Transmit/Receive RF Quadrature Body Coil – a coil used to transmit and to receive RF energy that
encompasses the entire body region within the MR system bore, and configured to use circular polarization
(CP).
MRI Transmit/Receive RF Quadrature Extremity Coil – a coil used to transmit and to receive RF energy
that is constrained to an extremity, and configured to use circular polarization (CP).
MRI Transmit/Receive RF Quadrature Head Coil – a coil used to transmit and to receive RF energy that
is constrained to the head region, and configured to use circular polarization (CP).
Radio Frequency (RF) – high frequency electrical fields whose frequencies are in the range of 10,000 Hz
and above. The RF used in the 1.5T MRI Scanner is ~64MHz.

Specific Absorption Rate (SAR)

– radiofrequency power absorbed per unit of mass (W/kg).
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IEC 60601-2-33
Tesla (T) – the unit of measure of magnetic field strength. One T is equal to 10,000 Gauss.
W/kg – Watts per kilogram, a measure of the power that is absorbed per kilogram of tissue.
3 ASTM F 2503-13, "Standard Practice for Marking Medical Devices and Other Items for Safety in the Magnetic Resonance Environment"
ImageReady™ MRI Full Body Guidelines for WaveWriter Alpha™ and WaveWriter Alpha™ Prime Spinal Cord Stimulator Systems
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