Image resolution or spatial resolution is the ability of the ultrasound wave to define 2 points as separate in space. This includes axial and lateral resolution. Also included is temporal resolution.
Axial resolution (azimuthal resolution) is the resolution of the objects along the line of the ultrasound beam. The axial resolution is directly proportional to the pulse resolution. This means that an increase in the frequency of the ultrasound waves reduces the wavelength, and thus the spatial pulse length. In short, the axial resolution depends on the wave frequency and spatial pulse length. It is not affected by altering the focus.
Lateral resolution is the resolution of structures at 90 degrees to the line of ultrasound waves propagation. It is a cause for artifact formation in imaging. It can be corrected by altering the focus. In addition, increasing the width of the bean and the frequency also increases lateral resolution.
Temporal resolution is the resolution of images over time. It is also called the frame rate. It is directly related to the pulse repetition frequency.
As discussed previously, backscatter is the reason why images are generated on the echo machine. It is not the cause for distortion of images, but in fact, required for normal image generation.
Axial resolution (azimuthal resolution) is the resolution of the objects along the line of the ultrasound beam. The axial resolution is directly proportional to the pulse resolution. This means that an increase in the frequency of the ultrasound waves reduces the wavelength, and thus the spatial pulse length. In short, the axial resolution depends on the wave frequency and spatial pulse length. It is not affected by altering the focus.
Lateral resolution is the resolution of structures at 90 degrees to the line of ultrasound waves propagation. It is a cause for artifact formation in imaging. It can be corrected by altering the focus. In addition, increasing the width of the bean and the frequency also increases lateral resolution.
Temporal resolution is the resolution of images over time. It is also called the frame rate. It is directly related to the pulse repetition frequency.
As discussed previously, backscatter is the reason why images are generated on the echo machine. It is not the cause for distortion of images, but in fact, required for normal image generation.
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