Tag: Biomedical measurements
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5 Types of Biomedical Instrumentation Systems
We have the following five types of biomedical instrumentation/measurement systems: Direct/Indirect In biomedical instrumentation we may have the sensing system measuring a physiological parameter directly, such as the average blood flow in an artery or indirect measurement where a parameter related to the physiologic parameter of interest such as ECG recording at the body surface…
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Common Challenges of EEG Analysis
Though EEG signal detection provides a key indicator for detection of neurological status and disorders, its biomedical application is limited. This is because of the complicated nature of EEG signal and the complexities regarding the interpretation of the signals. Some of the challenges of EEG analysis are discussed as follows: Artifacts The recordings of physiological…
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The Measurement of Ultraviolet Radiation in Biomedical Field
The measurement of ultraviolet radiation in biomedical field may be categorized into three classes: In general, physical devices measure power, whereas chemical and biological systems measure energy. The common radiometric terminology is shown in the table below: Table 1.0 Radiometric Terms Term Unit Wavelength Nanometer (nm) Radiant energy Joule (J) Radiant flux Watt (W) Radiant…
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Optical Tomographic Imaging
The optical properties of normal and diseased tissues are usually different despite the large variation of values in optical properties of the normal tissues alone. A case in point is the cancerous tissues that manifest significant architectural changes at the cellular and subcellular levels, and the cellular components that cause elastic scattering have dimensions typically…
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What is Echocardiography?
Echocardiography is a diagnostic technique that employs ultrasound to produce an image of the beating heart in real time. A piezoelectric transducer element is used to emit short bursts of high frequency, low intensity sound through the chest wall to the heart and then detect the reflections of this sound as it returns from the…
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The Function of a PET scan in Biomedical Diagnostics
The radionuclides that are employed in a PET scan as part of radiopharmaceuticals work best when used for imaging certain physiological properties. Combined with a CT scan or an MRI, a PET scan is good for locating things such as tumours. As a matter of fact, a PET scan can light up for the brain,…
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Key Features of EMG Amplifiers
The amplifiers used for clinical EMG recording must meet same strict specifications for low-leakage currents as do ECG, EEG, and any other amplifiers used to measure human body potentials. EMG amplifier gains are typically x1000 and their bandwidths reflect the transient nature of the single motor unit (SMU) action potentials. An EMG amplifier is generally…