time of flight

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time of flight

the time for a photon created by annihilation of a positron-electron pair to reach a detector; because annihilation photons are created in pairs and travel in opposite directions at about 3 × 1010 cm/sec, measurement of the difference in arrival time at detectors with subnanosecond resolution allows calculation of the location of the event; the basic physics of positron emission tomography.

time of flight

An MRI term referring to a magnetic resonance angiography technique based solely on the flow of unsaturated blood into a magnetised presaturated slice. The difference between the unsaturated and presaturated spins creates a bright vascular image without needing contrast media.

time of flight

(tīm flīt)
magnetic resonance imaging Rate of flow in a given time; causes some flowing nuclei to receive only one radiofrequency pulse and therefore produce a signal void.
References in periodicals archive ?
SoftKinetic's 3D camera technology is based on the time-of-flight (TOF) principles: the camera analyzes, in real-time, the complete position of each pixel in the scene (in three dimensions), and allows the system to track the movements of users with high accuracy.
The GM APD FPA, a 2D array of ultrasensitive light detectors, receives reflected light from the short 1 nanosecond pulse laser from a 3D LADAR camera and measures the time-of-flight of each photon, or distance, to each pixel in the image.
The time-of-flight difference depends on the initial kinetic energy of the protons and thus on the electron energy as seen in Fig.
The acquisition provides ThermoQuest with a time-of-flight mass spec product for gas chromatography applications and thus access to a growing lucrative market.
Illuminating emerging analytical techniques in high-resolution mass spectrometry, Liquid Chromatography Time-of-Flight Mass Spectrometry illustrates how to analyze unknown and emerging contaminants using advanced mass spectrometry techniques.
The CNRS Laboratory of Physical Meteorology (LAMP) wishes to acquire two time-of-flight high-resolution mass spectrometers with atmospheric pressure ionization (API TOFMS), designed for the chemical analysis of the gas phase up to that of the embryos of particles.
Recoil protons pass from the decay zone through a cylindrical time-of-flight electrode and are focused onto the MCP by spherical focusing electrodes.
In June 1997, IBO published an article on the market for time-of-flight (TOF) mass spectrometry instrumentation.
The newly released hybrid linear ion trap time-of-flight mass spectrometer (LIT-TOF MS) is the first commercially available instrument to combine the reproducibility and robustness of a true splitless nanoflow LC with the sensitivity and mass accuracy of a linear ion trap time-of-flight mass spectrometer.
The Basler ToF Camera operates on the pulsed Time-of-Flight principle.
The pulsed nature of the neutron beam with a narrow proton pulse provides accurate neutron energy information through a time-of-flight (TOF) measurement and the possibility for absolute polarimetry to control systematic uncertainties in precision experiments.
Among the company's key products are the 5973 and 5975 inert MSDs, the 7500 Series ICP-MS systems, and the new Agilent 6000 Series LC/MS triple quadrupole, ion trap, time-of-flight and quadrupole time-of-flight instruments.