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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
Signal and System01:26

Signal and System

A signal x(t) is a set of data or a time function representing a variable of interest. Signals typically convey information about a phenomenon, such as atmospheric temperature, humidity, human voice, television images, a dog's bark, or birdsongs. More generally, a signal can be a function of more than one independent variable. For instance, images depend on horizontal and vertical positions and can be regarded as two-dimensional signals. However, this text will focus on one-dimensional signals...
Parallel RLC Circuits01:14

Parallel RLC Circuits

Street lamps equipped with RLC surge protectors are an excellent example of applying circuit analysis in practical scenarios. These surge protectors safeguard the lamp's components against sudden voltage spikes.
A simplified parallel RLC circuit model with a DC input source generating a step response is employed in this context. When the switch is turned on, Kirchhoff's current law is applied, leading to a second-order differential equation.
Classification of Systems-I01:26

Classification of Systems-I

Linearity is a system property characterized by a direct input-output relationship, combining homogeneity and additivity.
Homogeneity dictates that if an input x(t) is multiplied by a constant c, the output y(t) is multiplied by the same constant. Mathematically, this is expressed as:
Radial System Protection01:23

Radial System Protection

Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...

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System and SAR characterization in parallel RF transmission.

Yudong Zhu1, Leeor Alon, Cem M Deniz

  • 1Department of Radiology, Center for Biomedical Imaging, New York University School of Medicine, New York, New York 10016, USA. Yudong.Zhu@nyumc.org

Magnetic Resonance in Medicine
|December 6, 2011
PubMed
Summary
This summary is machine-generated.

Parallel radiofrequency transmission in MRI offers control but complicates specific absorption rate (SAR) management. This study introduces a new method to predict and proactively manage SAR and power, tailored to individual patients and MRI hardware.

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)
  • Radiofrequency Engineering

Background:

  • Parallel radiofrequency transmission in MRI increases degrees of freedom, offering opportunities for E-field tailoring and SAR reduction.
  • However, this also increases the complexity of SAR behavior and the risk of exacerbating SAR due to improper pulse design.
  • Subject-dependency of SAR in high-field MRI further compounds these challenges.

Purpose of the Study:

  • To develop a clinically applicable method for characterizing global and channel-by-channel specific absorption rate (SAR) behavior in parallel RF transmission MRI.
  • To establish a predictive capability for SAR and power consequences specific to the subject and MRI hardware for any given excitation.
  • To lay the foundation for a proactive SAR and power management paradigm in MRI.

Main Methods:

  • Utilized a linear system concept and a calibration scheme with a finite number of in situ measurements.
  • Developed a method to characterize global SAR behavior and channel-by-channel power transmission.
  • Validated the predictive method through simulation and experimental studies.

Main Results:

  • The developed method accurately characterizes global SAR behavior and channel-by-channel power transmission.
  • The method demonstrated a unique capability to predict subject- and hardware-specific SAR and power consequences for any excitation.
  • Validation studies confirmed the method's promise for clinical application.

Conclusions:

  • A clinically applicable method for characterizing and predicting SAR and power in parallel RF transmission MRI has been established.
  • This predictive capability enables proactive management of SAR and power, moving beyond simple monitoring.
  • The findings support a future paradigm shift in MRI safety and optimization through prediction-guided control.