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In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Monitoring Leucine-Rich Repeat Containing 8 Channel (LRRC8/VRAC) Activity Using Sensitized-Emission F&#246;rster Resonance Energy Transfer (SE-FRET)
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Monitoring Leucine-Rich Repeat Containing 8 Channel (LRRC8/VRAC) Activity Using Sensitized-Emission Förster Resonance Energy Transfer (SE-FRET)

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FFRCT: Current Status.

Jack Chen1, Louis H Wetzel1, Kristen L Pope1

  • 1Department of Radiology, Cardiothoracic Imaging Section, Kansas University Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160.

AJR. American Journal of Roentgenology
|December 30, 2020
PubMed
Summary
This summary is machine-generated.

Fractional flow reserve derived from coronary CT angiography (FFRCT) noninvasively evaluates coronary artery disease by combining anatomical and physiological data. This review discusses current FFRCT trials, utility, and limitations.

Keywords:
coronary artery diseasefractional flow reservefractional flow reserve derived from coronary CT angiography

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Area of Science:

  • Cardiovascular imaging and intervention
  • Medical diagnostics

Background:

  • Coronary artery disease (CAD) diagnosis traditionally relies on invasive methods.
  • Noninvasive evaluation tools are crucial for improving patient outcomes and reducing healthcare costs.
  • Fractional flow reserve derived from coronary CT angiography (FFRCT) offers a combined anatomic and physiologic assessment.

Purpose of the Study:

  • To review the current evidence and status of FFRCT in evaluating coronary artery disease.
  • To present case examples of FFRCT utility and potential pitfalls.
  • To provide insights into the future applications of FFRCT.

Main Methods:

  • Review of existing clinical trials and studies on FFRCT.
  • Analysis of FFRCT performance in diverse patient cohorts.
  • Case-based illustration of FFRCT interpretation and clinical decision-making.

Main Results:

  • FFRCT demonstrates potential as a valuable noninvasive tool for diagnosing significant coronary artery stenosis.
  • Evidence from trials supports the accuracy and clinical utility of FFRCT in select patient populations.
  • Understanding the limitations and potential pitfalls is essential for appropriate application of FFRCT.

Conclusions:

  • FFRCT represents a significant advancement in the noninvasive assessment of coronary artery disease.
  • The current body of evidence supports the use of FFRCT, with ongoing research expanding its role.
  • Future applications may further refine diagnostic strategies and treatment decisions for patients with suspected CAD.