Introduction to Biomed Instrumentation Flashcards
Instruments and devices in medical practices are mainly for what purposes
- Diagnostic
- Therapeutic
- Assistive
What do diagnostic instruments do
Acquire information to tell the present state of the human conditions
What do therapeutic instruments do
Used to capture/control physiological processes that have been away from the normal condition or function due to disease, trauma, or some other agent
What do assistive instruments do
Used to make up for diminished body or organ function, or to provide a lost function
What are the different components of the medical instrumentation system
- Measurand: the physical quantity, property, or condition to be measured
- Sensor (transducer): a device that converts one form of energy, usually to electric signal
- Signal conditioning: processing (amplifying, filtering, impedance matching, sampling, etc) signals for transmission, storage, and display purposes
- Output Display: to display the measurement in a form that human operator can perceive
How can biomedical instruments be classified
- Measurement quantity (P, T, flow)
- Transduction property (resistive, capacitive, ultrasonic, X-ray, etc)
- Organ system
- Clinical specialty (pediatrics, cardiology, radiology, etc.)
Basic rules for ideal op-amp circuit
- When the op-amp output is in its linear range, the 2 input terminals are at the same voltage
- No current flows into either input terminal of the Op-Amp
Define range
The region between the limits wherein a variable is MEASURED
Define span
The difference between the lower and upper range limits
Define sensitivity
The change in output of an instrument as a result of a change in input
Define resolution
The smallest change that can be detected in the instrument reading
Define absolute error
true value - measured value
Define relative error
= (true value - measured value)/true value
Define accuracy
Maximum possible error
Define signal
Component of a variable which contains information about the measurand quantity
