Question

Classify the following items into Direct and Indirect measurements, sampling or continuous, and
real or delayed time signals, mentioning the reason behind your choice:
1. EEG signal measurement, to analyse the phyological behaviour of the brain.
2. Temprature measurement, to detect the degree of infection of the body.
3. CT scan image of the heart, to measure the volume of the heart.
4. The digital blood pressure measurement device, to measure the response to blood pressue related
medicine.
5. EOG signal, to measure the visual defects in eye (like farsightedness, astigmatism, and presbyopia).

Answer 1

Classification.

Test	Direct and Indirect	sampling or continuous	real or delayed time signals
EEG	indirect because EEG is taken to analyse the physiological behaviour of the brain. Here the electrodes are placed along the scalp only not inside the brain	continuous	Real.
Temperature	direct placing the thermometer directly on the area to measure	sampling /Temperature of the tested area and for a particular time only. The temperature may change next time when you test it.	Real
CT scan image of the heart	Indirect The patient is placed in the CT scanner taking the images not directly on the heart.	Continuos	Real.
The digital blood pressure measurement device	Indirect/direct test in the heart needs catheterization	sampling	Delayed time  signals
EOG signal	Indirect	continuous	Real