Author: John Mulindi
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Types of Spirometers & Technologies used
Spirometer is the instrument used to measure lung capacity and volume. The record obtained from spirometer is called a spirogram. There are a number of spirometers used in respiration volume measurements. In this article, we look at general types of spirometers according to their application and some of the technologies utilized in these spirometers. There…
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Features of Microprocessor-Based ECG Systems
Microprocessors have been used in electrocardiographs to obtain certain advanced features like the elimination of artefacts, baseline shifting, and so forth using software techniques. In this article, we look at some of the key features of microprocessor-based ECG systems as follows: Microprocessor-based ECG machines can perform self-testing each time they are switched on. They are…
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The Principle & Applications of Confocal Imaging
Confocal imaging (CI) is based on illuminating a single point on the sample and collecting scattered light from the same point of the sample. The illumination point on the sample is the image of the illumination pinhole and is imaged into the detector pinhole, hence making both pinholes and the illuminated spot on the sample…
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3 Common Causes of Anomalies in ECG Recordings
Irregular patterns of ECG may be caused by either pathological states or at times artefacts. Undesirable presence of artefacts on ECG trace may be due to the following: Interference from the Power Line This interference may be caused by the stray effect of the alternating current on the subject under measurement or because of alternating…
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Polarizable vs. Non-Polarizable Electrodes
We may categorize electrodes into two possible types albeit theoretically: those that are perfectly polarizable and those that are perfectly non-polarizable. This categorization is based on what happens to an electrode when a current passes between it and the electrolyte. Perfectly polarizable electrodes are those in which no actual charge crosses the electrode-electrolyte interface when…
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What is Bioinstrumentation?
Bioinstrumentation involves the measurement of current or voltage signals from the different parts of the body. The measurement of various physiological signals produced by the body helps in diagnosis and treatment of diseases. In actual fact, when we talk about bioinstrumentation we mean biomedical instrumentation. Basic Bioinstrumentation System The quantity, property, or condition that is…
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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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4 Classifications of Biomedical Measurement Instruments
Instruments that are used in biomedical measurements can be grouped into four categories, based on the following: Classification Based on Quantity that is sensed The techniques employed in biomedical measurement can be grouped as per the quantity that is sensed, such as pressure, flow or temperature. This categorization makes it easier to compare the different…