Login with Facebook

Why do biomedical signals need processing?

Bioengineering is important for medicine because it provides tools and methodologies that can support the doctor in diagnosing, monitoring particular parameters, and understanding certain problems, through the use of mathematical models. In general, it is that sector that integrates the knowledge and methods of engineering with the problems of medicine, that is, the application of mathematical models and technologies to the medical-biological model. And biomedical signal is the important part of it.

A signal describes the variation of a given quantity as a function of other variables, which can be time, space, or both. We talk about the biomedical signal when the source that generates these quantities is the living organism.

The measurement of these quantities, the acquisition, and analysis of these signals is vital in the field of medicine because it provides useful information for the diagnosis, rather than for monitoring therapeutic treatment. It can provide additional information to the specialist for a better understanding of what the physical, chemical, and biological processes under examination are.

Classification of biomedical signals

A first distinction had been made between:

- Signals spontaneously generated by the body

- Evoked signals, which instead are signals that our organism does not spontaneously generate but either if it receives a stimulus from the outside or if a certain external agent interacts with it.

Another classification is related to the dependence of our greatness. We talk about:

- Varying time signal when our signal, our magnitude varies as a function of time.

- Spatial signal if instead there is a variation of the observed quantity as a function of space.

- Spatiotemporal signal if there is a double dependence, both in time and in space.

Signals can be classified according to their origin. We talk about:

- Electrical bio-potentials (ECG, EEG, and EMG): They are all potentials generated by the onset of an action potential, depolarization, and repolarization of the cell membrane.

- Chemical signals

- Mechanical signals

- Thermal signals

Beyond their origin, it is possible to classify the properties of the signals based on their mathematical characteristics. For example, a first distinction concerns:

- Time-continuous signals: in which the magnitude we are measuring varies continuously with the passage of time; that is, for each instant of time, a measurement is made, and the value of that quantity is known.

- Discrete-time signals: In this case, the measurement is carried out only in specific instants of time, interspersed with each other; it is not a time-continuous measurement. Generally, these are quantities that vary slowly or are quantities for which it is not necessary to carry out that type of measurement.

- Deterministic signals: a signal is said to be deterministic when the value that the signal assumes in a certain time interval can be calculated through, for example, a mathematical equation. Or it can also be extrapolated based on the measurements we have made up to that moment. So deterministic because it is almost "predictable."

- Periodic signals: A particular class of deterministic signals. Periodic signals are signals whose waveform repeats after a certain period of time. This time interval is called a period, and the inverse of the period is called a signal frequency. In medicine, some signals have deterministic characteristics; in some cases, even periodic, for example, the voice has a behavior that in physiological conditions, we can define almost periodic.

In any case, most of the signals in the biomedical field are not deterministic, even not periodic, but are random or, in any case, have an almost random behavior.

- Random signals: random signals are those signals for which it is difficult to predict what the value will be that the signal will assume in the following instants of time up to those we have observed. So, in fact, there is no mathematical equation that describes the trend of the signals. Although taking measurements, while going to acquire the signal for a certain period of time, from the knowledge of the samples that we have acquired, we cannot reconstruct the signal in the following instants; so if we want to share information, we must necessarily acquire the signal and study the signal equation that we have acquired.

For example, the electroencephalographic signals, the electromyographic signal, are non-deterministic signals and therefore fall into the class of random signals.

In general, the concept of frequency is associated with the rapidity of variation of the signal, a signal that varies slowly has a lower frequency, a signal that varies rapidly has a higher frequency. And they have different frequency values within the same group of variables the signals. It can be higher frequencies and lower frequencies. The unit of measurement for frequency is the hertz.

So why is it important to know the measurement range and frequency of a signal?

For example, if a diagnosis has to be made, if there are normal ranges, one understands whether or not it actually falls. Furthermore, the frequency and the amplitude are the information characterizing the nature of the signal. Therefore it is essential to know it not only to derive the information the specialist needs from the acquired signals but also before making a measurement. As it is true, that has a ready-made tool, prepared ad hoc to carry out that measurement, but in fact, in the field of measurements, generally, those who must measure a certain size must have an idea of ​​what is going to be measured.

To have these ideas, he must know what the variation range is in terms of the amplitude of the signal magnitude, rather than the frequency value. Because there are instruments that can acquire only quantities with certain variation ranges rather than certain frequencies and those instruments, do not appreciate other values ​​, which instead could be the values ​​of interest.

Therefore it is also useful in choosing the instrumentation to understand if the measuring instrument available can monitor the quantity of interest. HoweverBiomedical engineering, it would help if you always had an initial idea of the characteristics of what you are measuring. Then this information is necessary to make appropriate considerations on the variations associated with diseases or physiological conditions.


Send Comment

Need a custom

We will write it for you.
Order now

Free Essay Examples

Free essays:

An ultimate guide about biochemical reactions
Analysis methods of Transport through biological membranes
A Comprehensive Introduction to the Mona Lisa
An ultimate guide about Biomaterials
Big data analysis in evolutionary biology
Brain-Computer Interface systems with EEG signals
Biochemistry of neurotransmitter
Bipolar disorder: Symptoms, causes, diagnosis and treatment
Cellular excitability
Characterization of biological tissues, biomaterials
Characteristics of the byzantine architecture
Commonly Confused Words: Part 2
Dynamic Systems Modeling with Machine Learning
Digital Imaging: What Is It?
Different forms of dance you should know about
Data Science: Fundamental tools for data analysis
Everything you need to know about enzymatic kinetics
Electromagnetic exposure effects on human organs
Effects of Different Environmental Factors on Artworks
Entrepreneur trends to know about
Famous Ballet Forms
Four postulates of natural selection
Famous African American literature authors
Film styles and the types of styles for shooting a film
Importance of online journalism
Importance of 3d Modelling in Architecture
Introduction to Utilitarianism
Identity theft: what to do?
Kinetic models in biology and Related fields
Know about the different forms of traditional African dances
Know about the history of science
Latest technology trends
Mass transport in a biological system
Major themes in ancient Egyptian art
Major healthcare trends
Misconceptions About the Word “Introvert”
Nonlinear Dynamics in Biology & Biomedicine
NLS (Nonlinear System) - Revolutionary system in diagnostic medicine and therapy
Neural networks: what they are and what they are for
Nuclear fusion: What it is and how it works?
Role of Homeostasis in Human Physiology
Role of a digital artist
Role of gender studies
Risk management, meaning, and importance for companies
Systems biology - An understanding the functioning of biological systems
Self-assembly for biological systems
School of American Ballet
Schizophrenia - a rare psychiatric illness | Essay
The impact of the technological innovations in medicine
The Defense mechanisms against infections
Tips for writing a great thesis statement
The Modeling of Biological Systems
Understand the importance of investigative journalism
Urban planning in the US
Understanding the sociology of Race & Ethnicity
Various theoretical perspectives of sociology
Women empowerment in modern generation
What Makes a Good Leader
What is biopolymers?
What is the cytoplasm and its function?
4 Facts about Origin of Mathematics!
5 techniques to create an animation
13 Best colleges for political science in the world
3d Model Of Building
All you need to know about the ACA Code of ethics
Architecture and Democracy: An Introduction
Architecture and Democracy: Democratic Values
Architecture and Democracy: Democratic Procedures
All You Need to Know About a Synthesis Essay
An essential guide to understanding Film Theory
Application of Artificial Intelligence in Cyber Security
Applications of electrical engineering
Augmented reality: what it is, how it works, examples
Advantages And Disadvantages Of Social Networking
All you need to know about Cryptography
Applications of astrophysical science
All you need to know about architecture engineering
Applications of geological engineering
Artificial intelligence and medicine: an increasingly close relationship
An insight into Computational Biology
ACA code of conduct
A Rose for Emily
Applications of Mathematics in daily life
Architecture mistakes to avoid
All you need to know about Toxicology
All you need to know about Holistic Medicine
All you need to know about linguistics
An introduction to Linguistics and its subfields
All you need to know about Anxiety disorder
All you need to know about Drones
A Brief Insight into Political Science
Assumptions related to feminism
All you need to know about Byzantine emperors
All you need to know about labour economics
An insight into xenobots -the first-ever robots
An ultimate guide about Biomaterials
A Comprehensive Introduction to the Mona Lisa
Analysis methods of Transport through biological membranes
An ultimate guide about biochemical reactions
How to Write a Personal Essay
Housing Needs in America
How to Write a Description Essay
How to Create an Excellent Scholarship Essay?
How to write a cause and effect essay
How to Hire the Best Essay Writing Service Provider?
How to Write a College Application Essay?
How to get the most out of your English lectures
How to write Expository Essay
How to succeed in your psychology class?
How to Write an Academic Essay in the Shortest Time?
History of Journalism
How Different Sectors are Using Artificial intelligence (AI)
How to write an informative essay
How to deliver persuasive essays?
How to Give a Convincing Presentation
How to write an essay on leadership?
Historical Art Still Around Today
Humanoid robot: what it is, how it works and price
History of Chemistry
Healthcare Advanced Computer Power: Robotics, Medical Imaging, and More
Healthcare AI: Game Changers for Medical Decision-Making and Remote Patient Monitoring
How to understand different types of English
How to Cope with Chronic Pain
How African American choreographers and dancers have influenced American dance
How mobile robot can do in logistics or in production
How To Become a Successful Entrepreneur
History of the Philosophy of Feminism
How is the climate changing?
How to Track Your Content Marketing ROI
How to Gun control In the USA?
Historical and contemporary role of labour in the modern world
How breast cancers are classified?
How the cells of our body communicate?
How the Lymphatic System Works?
How Digestive System Works
How to complete your capstone projects effectively?
How to write a research project
Healthcare technologies that help patients with better self-management
How to choose the topic of the senior capstone project