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MRSO

Time-varying RF Fields

QuestionAnswer
The amount of energy tilt hydrogen from longitudinal magnetism into the transverse axis. 90 Degree RF
The amount of energy used to move hydrogen is 180 degrees. This is used in a spin echo sequence to regain phase coherency. 180 Degree RF
A term used to describe body types based on shape and size. Body Habitus
The unit is used to describe the time-varying RF magnetic field. Bsub1
The electrical field results when a conductive material is exposed to a changing magnetic field. E-Fields
The spectrum of frequencies that identify the amount and form of energy found at specific frequencies. Electromagnetic Spectrum
This describes how electrical currents are produced in alternating magnetic fields. Faraday's Law of Induction
The area in our gantry is furthest from the RF transmitter. Far Field
This is a mode where the maximum regulated limit of SAR is allowed during acquisition. This is limited to 4W/kg for the whole body. First Controlled Mode
A variable RF pulse will tilt hydrogen away from the longitudinal axis less than 90 degrees. Flip Angle
The rate that something is repeated over some time. Frequency
The amount of waveforms in a second. Hertz
The equation is used to identify the center frequency at a specific static magnetic field strength. Precessional frequency=gyromagnetic ratio * B0 Larmor Equation
The period after an excitation pulse where magnetism returns to equilibrium magnetism. Longitudinal Recovery
This is a burning where an electrical current is induced in a patient and forced through a small contact area, causing a burn. Loop Burns
The area in our gantry is closest to the RF transmitter. Near Field
A form of energy that does not cause biological damage to tissues. Non-ionization
This is a standard mode of operation where SAR for the whole body is kept to 2 W/kg. Normal Mode
This is a technique where two or more coils can be used simultaneously to collect multiple lines of K space. Parallel Imaging
The range of frequencies that are used in MRI to produce resonance. Radio waves
A receiver coil that only detects the signal emitted from the patient. Receive Only Coil
This is a burning where RF is reflected in the patient producing burning. Reflective Burns
The transverse of energy from one thing to another using two or more things oscillating at the same frequency. Resonance
This is a type of burn where resonance is produced in an implant or equipment on a patient, making induction. The e-fields produced will cause burning. Resonant Burns
This is a type of burning where tissues in the near field get burned. Proximity Burns
This is a mode reserved for research or testing where the SAR can operate above the maximum regulated limit. Second Controlled Mode
This is used to measure the amount of patient heating produced in a patient during acquisition. It is measured in watts/kg. Specific Absorption Rate
The body releases sweat through pores so that evaporation can occur. This evaporative cooling can help lower body temperature. Thermoregulatory Mechanisms: Evaporation
Energy can be transferred from one source to another. For example, flowing blood can be cooled by placing a cold source on our patient, lowering a patient's body temperature. Thermoregulatory Mechanisms: Conduction
Heat radiates from a heat source to a cooler area. By passing cool air over a patient, heat can move away from the patient lowering their body temperature. Thermoregulatory Mechanisms: Convection
Heat will flow away from a patient body. Thermoregulatory Mechanisms: Radiation
A receiver coil that produces RF energy detects a patient signal. Transmit-Receive Coil
The period after an excitation pulse where magnetism is lost in the transverse axis Transverse Decay
The distance from one amplitude in a frequency to the next. Wavelength
Created by: zach1710
 

 



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