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.
Farlex Partner Medical Dictionary © Farlex 2012

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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
ETOF enhancement of the pulsed indirect time-of-flight method relies on the following main pillars: enhanced dynam ic range, high accuracy at short range and long range, immunity to blinding from external light sources, and digital pulse timing control.
Having established time-of-flight at any given range, you can instantly determine how far your bullet will drop and compensate.
In a new paper in the journal IEEE Access, the team has presented new approach to time-of-flight imaging that increases its depth resolution 1,000-fold - the type of resolution that could make self-driving cars practical.
The Waters Xevo G2 TOF (time-of-flight) mass spectrometer with UPLC/MSE and QuanTof technology offers sensitive, exact mass quantitative and qualitative performance of any benchtop MS system for scientists who need to confidently identify and quantify unknown compounds in complex samples.
The Geiger-Mode Avalanche Photodiode (GM APD) Focal Plane Array (FPA), an invention of Massachusetts Institute of Technology's Lincoln Laboratory, Lexington, Mass., can detect and time-stamp single photons by using its unique, independent digital time-of-flight counting circuits, and its extremely high internal detector gain.
We propose to measure the beta-neutrino asymmetry coeffcient, a, using time-of-flight for the recoil protons.
Technologies, a mass spectrometer company, specializing in time-of-flight (TOF) spectrometer systems for quantitative laboratory analysis and ion-trap mass spectrometer systems.
But a technique called optical time-of-flight and absorbance imaging (TOFA) lets researchers view not only organs, but also gas inside those organs.
Agilent's 6220 Accurate-Mass time-of-flight (TOF) and 6520 Accurate-Mass quadrupole time-off-light (Q-TOF) liquid chromatography/mass spectrometry (LC-MS) systems deliver superior mass accuracy, mass resolution, sensitivity and speed.