ECHOCARDIOGRAM

Echocardiogram is record of ultrasonic measurements in the heart. It is analogous to the electrocardiogram. A record of ultrasonic measurements from the brain is known as echoencephalogram. Ultrasonic eye analysis is known as ultrasonogram. Some other instruments where ultrasonics used are ultrasonograph, ultrasonoscope, sonofluoroscope etc. A phased-array ultrasonograph is nothing but a virtual medical ultrasound laboratory in a single mobile instrument. It includes a large video display which makes possible easy viewing and parallely presents supplementary information along with the diagnostic image. Here two different sets of gain controls give maximum flexibility in optimizing the image for specific information.

Electromyogram

Electromyogram or EMG is associated with human muscle activity. The bioelectric potentials of human muscle activity is measured by a certain process where needle electrodes are used to penetrate the skin. The summation of all the potentials yields EMG. The amplitude of the measured EMG waveform can be interpretated as the instantaneous sum of all the potentials of muscle or muscle groups generated at any given time. Hence we can expect a random-noise waveform here. Here electrodes sense potentials from all the muscles within its range. Regardless the stimulus intensity, we know that all muscles possess an action potential with a fixed magnitude. The waveform sometimes also called as interference pattern.