Important Amplifier Properties Isolation For the biological subject, against electric shock from the amplifier’s power source(s)–or, how to not kill your patient while taking measurements! For the signal-to-noise ratio (SNR): isolation keeps the (60-Hz mains and other) noise out of the sensor pickup–and out of the amplifier input. One simple way to isolate the input [...]
Tags: AICHo, Amplifier Saturation, Amplifiers, Bandwidth, Biomedical Engineering, Biosignal, DAQ, DAQ Card, Differential Amplifier, Isolation, Pre-Amplifier, Single-Ended
This post is about amplifiers, how they work, and common applications. I will cover several operational amplifier configurations, and situations where each might be useful. This is part I of II for general discussion about amplifiers. Enjoy! Amplifiers Definition (for Bioinstrumentation): Circuit that makes a small signal, usually voltage but occasionally current or power, big [...]
Tags: Amp, Amplifier Saturation, Amplifier Schematic, Amplifiers, Bias Current, CMRR, Common-Mode, DC offset, Diff Amp, Difference Amp, Differential Amp, Frequency Dependance, Gain, Input Impedance, Instrumentation Amp, Operational Amplifier, Output Impedance, Saturation, Wheatstone Bridge
Posted by Jeff on Dec 7, 2009 in
Biomedical Engineering This post is continuing from Biomedical Image Processing – III. Enjoy Basic Image Modification While image processing operations can be performed in hardware (e.g., in cases where speed is paramount), many image processing operations are performed in software. This section discusses some of the basic processing operations performed on different types of images, including image [...]
Tags: boolean operations, component labeling, digital filters, grayscale imaging, image modification, image processing, pixels, point operations
Posted by Jeff on Dec 4, 2009 in
Biomedical Engineering This post is continuing from Biomedical Image Processing – II. DICOM Image Standard Medical specialists have been slow to adopt widely accepted standards for image/film storage, display, and transmission. However, one standard has been adopted with reasonable success in the radiology community: DICOM (Digital Imaging and Communication in Medicine) has been progressively developed since 1983 [...]
Tags: biomedical image processing, component labeling, dicom, dicom image standard, image analysis, image classification, intensity histogram, m-mode
Posted by Jeff on Dec 2, 2009 in
Biomedical Engineering Continuing from Biomedical Image Processing – I Image Properties Once an image is stored in digital format, it can be described by a number of different parameters. Some of the relevant parameters are briefly discussed here. The traditional convention for an image coordinate system is depicted in Figure 4. Figure 4. General convention for image [...]
Tags: aspect ratio, image coordinate system, image processing, image properties, monochrome, pixel, voxel
