"The intensity/loudness/amplitude of ultrasound is measured as milliwatts cm-2 or watts cm-2. Diagnostic and low-intensity ultrasound range from 0.1 to 1 watts cm-2, while high-intensity ultrasound is more than 10 watts cm-2 4. Power is energy generated per unit time, measured in joules per second or watts 5. The intensity or power of the ultrasound is directly proportional to the square of the amplitude 5. Meanwhile, relative sound intensity is measured by decibels, which compares the relative intensity of two sound beams 2. The loss of 3 decibels will reduce the sound intensity by half 2."
"The intensity/loudness/amplitude of ultrasound is measured as milliwatts cm-2 or watts cm-2. Diagnostic and low-intensity ultrasound range from 0.1 to 1 watts cm-2, while high-intensity ultrasound is more than 10 watts cm-2 4. Power is energy generated per unit time, measured in joules per second or watts 5. The intensity or power of the ultrasound is directly proportional to the square of the amplitude 5. Meanwhile, relative sound intensity is measured by decibels, which compares the relative intensity of two sound beams 2. The loss of 3 decibels will reduce the sound intensity by half 2."
"The intensity/loudness/amplitude of ultrasound is measured as milliwatts cm-2 or watts cm-2. Diagnostic and low-intensity ultrasound range from 0.1 to 1 watts cm-2, while high-intensity ultrasound is more than 10 watts cm-2 4. Power is energy generated per unit time, measured in joules per second or watts 5. The intensity or power of the ultrasound is directly proportional to the square of the amplitude 5. Meanwhile, relative sound intensity is measured by decibels, which compares the relative intensity of two sound beams 2. The loss of 3 decibels will reduce the sound intensity by half 2."
"Ultrasound is the most common term used for this modality however occasionally ultrasonography (USG), or just sonography are used. When abbreviated, USS, short for ultrasound scanning, may be used as an alternative. Echography is a rare synonym but is seen especially concerning ultrasound of the eye 3."
"Doppler evaluation of organs and vessels adds a dimension of physiologic data, not available on other modalities (except some MRI sequences)"
"An ultrasound transducer, also known as a probe, operates based on the physical principles of ultrasound. It sends an ultrasound pulse into tissue and then receives echoes back. The echoes contain spatial and contrast information. The concept is analogous to sonar used in nautical applications, but the technique in medical ultrasound is more sophisticated, gathering enough data to form a rapidly moving two-dimensional grayscale image."
"An ultrasound transducer, also known as a probe, operates based on the physical principles of ultrasound. It sends an ultrasound pulse into tissue and then receives echoes back. The echoes contain spatial and contrast information. The concept is analogous to sonar used in nautical applications, but the technique in medical ultrasound is more sophisticated, gathering enough data to form a rapidly moving two-dimensional grayscale image."
"Some characteristics of returning echoes from tissue can be selected out to provide additional information beyond a grayscale image. Doppler ultrasound, for instance, can detect a frequency shift in echoes, and determine whether the tissue is moving toward or away from the transducer. This is invaluable for the evaluation of some structures such as blood vessels or the heart (echocardiography)."
Expected headings
"Advantages"
"Disadvantages"
"Transducer"
"the real-time nature of ultrasound imaging is useful for the evaluation of physiology as well as anatomy (e.g. fetal heart rate)"
"ultrasound is not capable of evaluating the internal structure of tissue types with high acoustical impedance (e.g. bone, air). It is also limited in evaluating structures encased in bone (e.g. cerebral parenchyma inside the calvaria)"
"Ultrasound continues to evolve additional functions, including spatial compounding, harmonic imaging, 3D ultrasound imaging, panoramic ultrasound, elastography, and contrast-enhanced ultrasound using microbubbles."