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Related Concept Videos

What is a Mode?01:07

What is a Mode?

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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Modes of Standing Waves: II01:04

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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A Bipolar Junction Transistor (BJT) is a versatile component in electronics, functioning in four distinct modes based on the biasing of its junctions: active, saturation, cut-off, and inverted modes.
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Direct List Mode Parametric Reconstruction for Dynamic Cardiac SPECT.

Luyao Shi, Yihuan Lu, Jing Wu

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    This study introduces a new direct parametric imaging algorithm for cardiac SPECT, significantly reducing noise and improving myocardial blood flow quantification. This method enhances accuracy and allows for lower radiation doses for patients.

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    Area of Science:

    • Nuclear Cardiology
    • Medical Imaging Physics

    Background:

    • Stationary cardiac SPECT scanners enable dynamic myocardial blood flow (MBF) quantification.
    • SPECT's low sensitivity leads to high noise, impacting MBF accuracy, especially with low-dose 201Thallium (201Tl).
    • Conventional indirect methods for parametric imaging are prone to noise and bias.

    Purpose of the Study:

    • To develop a direct parametric image reconstruction algorithm for dynamic SPECT.
    • To reduce noise and improve MBF quantification accuracy.
    • To enable patient radiation dose reduction.

    Main Methods:

    • Developed a list mode direct parametric image reconstruction algorithm.
    • Utilized GPU-based parallel computing for significant acceleration (>2000-fold).
    • Evaluated the method using simulations and in vivo canine studies.

    Main Results:

    • The direct method achieved substantially lower image noise and variability compared to the indirect method.
    • Performance improvements were notable at high iteration counts and low-count levels.
    • Demonstrated feasibility in both simulated and real-world (canine) data.

    Conclusions:

    • The proposed direct reconstruction algorithm offers superior noise reduction for MBF quantification in dynamic SPECT.
    • This advancement holds potential for more accurate cardiac imaging and reduced patient radiation exposure.
    • The GPU acceleration makes the method computationally feasible for clinical application.