Temporal resolution (TR) refers to the precision of a measurement with respect to time. Often there is a trade-off between the temporal resolution of a measurement and its spatial resolution, due to Heisenberg’s uncertainty principle.
Keeping this in consideration, what is resolution in signal processing?
Speech signal processing on a digital machine needs sampling and storing of the analog version of the speech signal generated at the output of microphone. Sampling frequency is the parameter that controls the sampling process. The number of bits per sample is the parameter that controls the bit resolution.
What is the difference between sampling rate and sampling frequency?
Sample rate is the number of samples of audio carried per second, measured in Hz or kHz (one kHz being 1 000 Hz). For example, 44 100 samples per second can be expressed as either 44 100 Hz, or 44.1 kHz. Bandwidth is the difference between the highest and lowest frequencies carried in an audio stream.
What is the sampling frequency?
The sampling frequency (or sample rate) is the number of samples per second in a Sound. For example: if the sampling frequency is 44100 hertz, a recording with a duration of 60 seconds will contain 2,646,000 samples.
What is the frequency resolution of FFT?
Frequency resolution is the distance in Hz between two adjacent data points in the DFT. The frequency resolution of a DFT is defined as F s N . Where is the sampling rate and is the number of data points.
What is the definition of spatial resolution?
spatial resolution. (Data West Research Agency definition: see GIS glossary.) A measure of the accuracy or detail of a graphic display, expressed as dots per inch, pixels per line, lines per millimeter, etc. It is a measure of how fine an image is, usually expressed in dots per inch (dpi).
What is the meaning of spatial resolution?
Spatial resolution is a term that refers to the number of pixels utilized in construction of a digital image. Images having higher spatial resolution are composed with a greater number of pixels than those of lower spatial resolution.
What is temporal resolution in ultrasound?
Wider beams typically diverge further in the far field and any ultrasound beam diverges at greater depth, decreasing lateral resolution. Therefore, lateral resolution is best at shallow depths and worse with deeper imaging. Temporal resolution is the ability to detect that an object has moved over time.
What is temporal resolution in remote sensing?
In addition to spatial, spectral, and radiometric resolution, the concept of temporal resolution is also important to consider in a remote sensing system. Therefore the absolute temporal resolution of a remote sensing system to image the exact same area at the same viewing angle a second time is equal to this period.
What is temporal resolution in MRI?
The concept of temporal resolution is fundamental to cardiac CT and MRI, in which a rapidly beating heart is imaged over the order of milliseconds into multiple frame-captures. In MRI, the time gap between consecutive images indicates the temporal resolution which is given by the formula: VPS.TR.
What do you mean by spectral resolution?
Spectral resolution is the ability to resolve spectral features and bands into their separate components. The spectral resolution required by the analyst or researcher depends upon the application involved. For example, routine analysis for basic sample identification typically requires low/medium resolution.
What is a radiometric resolution?
radiometric resolution. [physics] The sensitivity of a sensor to incoming reflectance. Radiometric resolution refers to the number of divisions of bit depth (for example, 255 for 8-bit, 65,536 for 16-bit, and so on) in data collected by a sensor.
What is temporal resolution in CT?
A fuller view of CT temporal resolution. The efficacy of any cardiac imaging technology relates to its ability to deliver image detail (as expressed in spatial resolution) in the smallest “window” of time – expressed as temporal resolution, often by a number of milliseconds (ms).
What is cardiac gating?
Gating techniques are used to improve temporal resolution and minimize imaging artifacts caused by cardiac motion. Two approaches to cardiac gating are typically used: prospective ECG triggering and retrospective ECG gating. The least cardiac motion occurs during diastole, when the ventricles are passively filling.
What is contrast resolution?
Contrast resolution is the ability to distinguish between differences in intensity in an image. The measure is used in medical imaging to quantify the quality of acquired images. It is a difficult quantity to define, because it depends on the human observer as much as the quality of the actual image.
What is contrast resolution in radiology?
Contrast resolution in radiology refers to the ability of the imaging modality to distinguish between differences in image intensity. The inherent contrast resolution of a digital image is given by the number of possible pixel values, and is defined as the number of bits per pixel value.
What is contrast to noise ratio?
Contrast-to-noise ratio (CNR) is a measure used to determine image quality. CNR is similar to the metric, signal-to-noise ratio (SNR), but subtracts off a term before taking the ratio. This is important when there is a significant bias in an image, such as from haze.
What is carrier to noise ratio?
In telecommunications, the carrier-to-noise ratio, often written CNR or C/N, is the signal-to-noise ratio (SNR) of a modulated signal. Therefore, the term carrier-to-noise-ratio (CNR), instead of signal-to-noise-ratio (SNR) is preferred to express the signal quality when the signal has been digitally modulated.
What is signal to noise ratio in radiology?
Signal-to-noise ratio (SNR) is a generic term which, in radiology, is a measure of true signal (i.e. reflecting actual anatomy) to noise (e.g. random quantum mottle). A lower signal-to-noise ratio generally results in a grainy appearance to images.
What is noise in radiology?
Noise is present in all electronic systems, and originates from a number of sources including electronic interference. It appears as irregular granular pattern in all images and degrades image information. It may be inapparent or render images non-diagnostic, depending on the severity.
What is the cause of quantum mottle?
Quantum mottle is a type of radiographic noise directly related to the number of x-ray photons exiting the patient and forming the radiographic image. Fewer photons reaching the image receptor will cause an undesirable fluctuation in image densities, resulting in images with a grainy, or sandlike, appearance.
What is a quantum noise?
In physics, quantum noise refers to the uncertainty of a physical quantity that is due to its quantum origin. In certain situations, quantum noise appears as shot noise; for example, most optical communications use amplitude modulation, and thus, the quantum noise appears as shot noise only.
What is quantum mottle artifact?
quantum mottle. Type:Term. Definitions. 1. mottle caused by the statistical fluctuation of the number of photons absorbed by the intensifying screens to form the light image on the film; faster screens produce more quantum mottle.
What is spectral analysis of signals?
According to Fourier analysis any physical signal can be decomposed into a number of discrete frequencies, or a spectrum of frequencies over a continuous range. The statistical average of a certain signal or sort of signal (including noise) as analyzed in terms of its frequency content, is called its spectrum.