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Imaging Modality: Ultrasound - Article Example

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The article “Imaging Modality: Ultrasound” focuses on one of the commonly employed Image-Guided Radiation Therapy technologies that use high-frequency sound waves to produce images of the internal structures in the human body. In ultrasound, a transducer is used to produce high-frequency sound waves…
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Imaging Modality: Ultrasound
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Download file to see previous pages The probe in the ultrasound scanner has within it several high-frequency sound transmitters that are arranged in a line along the length of the probe. Usually, five of these transmitters are fired at the same time resulting in a short pulse of ultrasound in a narrow beam moving away from the probe. These transmitters then become receivers for recording the intensity of the reflected sound wave. This action is repeated in a sequence along the length of the probe. The time taken for receiving the echo helps to determine the depth from the probe, as the sound is taken to travel at a constant speed (1540m/s). The intensity of the echoes received from any point is reflected through the brightness of that point on the screen of the scanner (Dynamic Ultrasound Group, 2009).  The probe in the ultrasound scanner has within it several high-frequency sound transmitters that are arranged in a line along the length of the probe. Usually, five of these transmitters are fired at the same time resulting in a short pulse of ultrasound in a narrow beam moving away from the probe. These transmitters then become receivers for recording the intensity of the reflected sound wave. This action is repeated in a sequence along the length of the probe. The time taken for receiving the echo helps to determine the depth from the probe, as the sound is taken to travel at a constant speed (1540m/s). The intensity of the echoes received from any point is reflected through the brightness of that point on the screen of the scanner (Dynamic Ultrasound Group, 2009).   A single pulse travels along a path that is called the beam. The lateral resolution of the image received is dependent on the width of the beam. The axial resolution is determined by the length of the pulse. The use of higher frequencies enables the generation of shorter pulses and so normally the highest frequency that is practical is used (Dynamic Ultrasound Group, 2009). The echoes from within the body are generated by two very distinct patterns of reflection of the sound waves, namely specular reflection and scattering, which are used to create the ultrasound image. It is the specular reflection that causes the bright appearance of fibrous structures like tendons and the boundaries amidst various other tissues. This happens as a result of the sound wave coming in contact with a distinct surface that is larger than the wavelength of the ultrasound. The intensity of the sound that is reflected between two different tissues like fat and muscle is dependent on their acoustic impedance, which varies depending on the density and compressibility characteristics of the tissue. It is scattering that is responsible for the characteristic texture of ultrasound images seen within the soft tissue. ...Download file to see next pagesRead More
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