PPT 1 Flashcards
What are the three kinds of biomedical signals?
- Biochemical
- Electrical
- Physical
What are the two types of signals as a function of time?
examples?
discrete - taking temp at same time(s) each day
continuous - monitoring temp continuously
What is a multivariant vector?
measurement results with more than one value such as blood pressure (sys/dias)
What are the objectives of biomedical signal analysis?
(5)
- Info Gathering - measuring to interpret system
- Diagnosis - detecting malfunction/pathology
- Monitoring - continuous/periodic info abt system
- Therapy/Control - modify system behaviour based on first 3 to obtain result
- Evaluation - effect of treatment
IDMTE
I Don’t Mean To Eavesdrop
What are the two different classifications of signal acquisition processes?
(2 types of each classification)
Invasive - transducers, etc. inside body
Non-invasive - surface electrodes
Active - require external stimuli
Passive - no external stimuli
What are the components of the human-instrument system?
- Patient
- Stimulus
- Transducers - sensors/electrodes
- Signal Conditioning Equipment - amplifier/filter
- Display - oscilloscope/monitors
- Recording/Processing/Transmission - tape, CD, comp.
- Control Devices - power supply, isolation
PSTCDRC
Patrick Stopped Training Condors to Dive Really Controversially
What is hysteresis?
a lag in measurement due to the direction of variation of the entity being measured
What is the “linearity” of a biomedical instrument?
the correlation between signal measurement and output
What are the (9) properties of biomedical instruments
- Isolation - of patient
- Range of operation - min/max values measured
- Sensitivity - minimum measurable value
- Linearity - signal goes up, output goes up
- Hysteresis - measurement lag due to variation
- Frequency Response - sensitivity varies with freq.
- Stability - consistent measurements
- Signal-to-Noise Ratio
- Accuracy
IRSLHFSSA
Irsle Huffsa
What are some difficulties of biomedical signal processing?
- Accessibility of the variables
- Variability of the signal source
- Interaction among physiological systems
- Interference from instrumentation
- Energy Limitation
- Patient Safety
What are all the elements between the patient and physician in a computer-aided diagnosis (CAD) system?
3 categories with 8 total elements
-
Signal Data Acquisition
- Transducers
- Isolation
- Amplifiers/Filters
- Analog > Digital Conversion
-
Signal Processing
- Artifact Filtration
- Detection of Events/Components
-
Signal Analysis
- Analysis of Events of Waves, Feature Extraction
- Pattern Recognition, Classification, Diagnosis
Why are CAD systems used?
- tend to anaylze data/signals better than humans because:
- humans get bored
- humans are better with subjective/qualitative
- biomedical signals are slow and can be analyzed online by low-end computers
