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 ?
The primary purpose of the Time of Flight sensor is to be able to capture 3D information (depth) of a scene.
A resonant radio frequency (RF) spin flipper, consisting of a 30 cm diameter by 30 cm long solenoid whose magnetic field amplitude is tailored as a function of time of flight to flip neutron spins of all energies, is located upstream of the target.
Atmospheric Pressure Interface Time of Flight Mass Spectrometer to be used in the Atmospheric Aerosol Research.
Voluntary ex ante transparency notice: gas chromatograph (gc) with a downstream quadropole time of flight mass spectrometer (q-tof), including pc control software for control and evaluation, as well as accessories.
Contract notice: Ion mobility quadrupole time of flight mass spectrometry for metabolomic studies.
Contract notice: Gas chromatograph (gc) with a downstream quadropole time of flight mass spectrometer (q-tof).
Prior Information Notice: Kvalab - "ion mobility quadrupole time of flight mass spectrometry ion mobility" for metabolomic studies.
today introduced the 7200B Quadrupole Time of Flight (Q-TOF) Gas Chromatography Mass Spectrometer (GC/MS) System.
Contract notice: Acquisition of a real-time analyzer mass spectrometry (ms) by proton transfer (ptr), multiple reactant ions (sri), to guide ions by quadrupole (qi) and time of flight (tof).
Acquisition of a photoelectron spectrometer time of flight resolved angle (Angle Resolved Time Of Flight spectrometer, Artof) for measuring the electronic band structure of solids, with ultra-high vacuum test chamber.
This tender exercise is for the supply and installation of a Time of Flight Secondary Ion Mass Spectrometer (ToF-SIMS) with appropriate post-installation user Training.