Biomedical Signal Analysis by Rangaraj M. Rangayyan

By Rangaraj M. Rangayyan

The ebook might help support a reader within the improvement of thoughts for research of biomedical indications and machine aided diagnoses with a pedagogical exam of simple and complicated issues observed by means of over 350 figures and illustrations.

  • Wide variety of filtering recommendations provided to deal with a variety of applications
  • 800 mathematical expressions and
  • Practical questions, difficulties and laboratory exercises
  • Includes fractals and chaos idea with biomedical applications

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Example text

As greater tension is developed, an interference pattern EMG is obtained, with the constituent and active motor units firing in the range of 25 − 50 pps. Grouping of MUAPs has been observed as fatigue develops, leading to decreased high-frequency content and increased amplitude in the EMG [37]. 17. EMG signals recorded using surface electrodes are complex signals including interference patterns of several MUAP trains and are difficult to analyze. An EMG signal indicates the level of activity of a muscle, and may be used to diagnose neuromuscular diseases such as neuropathy and myopathy.

When stimulated by a neural signal, each motor unit contracts and causes an electrical signal that is the summation of the action potentials of all of its constituent cells. This is known as the single-motor-unit action potential (SMUAP, or simply MUAP) and may be recorded using needle electrodes inserted into the muscle region of interest. Muscles for gross movement or large force have hundreds of muscle fibers per motor unit; muscles for precise or fine movement have fewer fibers per motor unit.

Body fluids surrounding cells are conductive solutions containing charged atoms known as ions. 4 gives a schematic illustration of a cell and its characteristics. semipermeable membrane Excitable cell enclosed in a semipermeable membrane Important ions: + + + − Na, K, Ca, Cl Body fluids: conductive solutions containing ions Selective permeability: some ions can move in and out of the cell easily, wheareas others cannot, depending upon the state of the cell and the voltage-gated ion channels. 4 Schematic representation of a cell and its characteristics.

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Biomedical Signal Analysis by Rangaraj M. Rangayyan
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