What is frame rate on ultrasound?
What is frame rate on ultrasound?
Temporal resolution is described by the so-called frame rate. The latter is defined as the number of ultrasound images displayed in one second and is expressed in Hertz (Hz).
What is the typical resolution of ultrasound?
The typical required resolution for medical ultrasound is 1 mm. Resolution of an ultrasound beam is defined in three planes: axial, lateral, and elevational planes. Axial resolution is the ability to discern between two points along or parallel to the beam’s path.
How can frame rate be improved in ultrasound?
A high frame rate and hence enhanced temporal resolution may be improved by: reduced depth of penetration, since pulses have to travel a short distance; reduced number of focal points, since scan lines do not have to be duplicated; reduced scan lines per frame, using narrow frames rather than wide frames.
What is elevational resolution in ultrasound?
Elevational (azimuthal) resolution represents the extent to which an ultrasound system is able to resolve objects within an axis perpendicular to the plane formed by the axial and lateral dimensions.
What is the average velocity of ultrasound in soft tissue at 5.0 MHz?
1540 m/s
When higher ultrasound frequency is selected, the wavelength becomes shorter, giving better detail and spatial resolution along the direction of propagation. For instance, in soft tissue with a speed of 1540 m/s, a 5-MHz frequency has a wavelength in tissue of λ = c / f ; 1540 m/s ÷ 5,000,000/s = 0.00031 m = 0.31 mm.
How do I work out my frame rate?
To calculate frames per second, you just take the number of rendered frames and divide it by the seconds passed.
What affects temporal resolution in ultrasound?
When an image is displayed in one dimension over time, temporal resolution is high. Contrast resolution is altered by compression of the range of reflected ultrasound amplitudes, number of layers of bits per pixel, and the use of contrast agents.
How do you calculate frame duration?
3. Each frame carries three output time slots. So the duration of a frame is 3 × (1/3) ms, or 1 ms. The duration of a frame is the same as the duration of an input unit.
