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 company offers a complete family of 3D imaging and gesture recognition solutions, including patented 3D CMOS time-of-flight sensors, modules and cameras (DepthSense family of products, formerly known as Optrima product family), multi-platform and multi-camera 3D gesture recognition middleware and tools (iisu family of products) as well as games and applications from SoftKinetic Studios.
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.
GeneTrace is focused on the development of high-throughput, production-scale time-of-flight mass spectrometry instrumentation and associated reagents for DNA sequencing and sizing, and proprietary bioinformatics software.
Liquid Chromatography and Ambient Ionization Time-of-Flight Mass Spectrometry for the Analysis of Genuine and Counterfeit Pharmaceuticals (Facundo M.
The fastest growing area of time-of-flight is LC-TOF, which includes electro-spray ionization (ESI) and atmospheric pressure ionization (API).
The NanoFrontier([R]) LC/MS platform is a hybrid system that combines the unparalleled separation of a nanoLC with the high sensitivity of a linear ion trap and the high mass accuracy and resolution of a time-of-flight mass analyzer.
This tender is for the supply, delivery, installation and maintenance of a state of the art Time-of-Flight Secondary Ion Mass Spectrometry (ToFSIMS) instrument having cluster-ion sputter facilities and capable of both dynamic and static SIMS analysis of inorganic, semiconductor and organic materials.
Thus, we arrive at a new concept of the UCN production with SD2, setting a single crystal converter of ortho-deuterium in the exit beam of a cold neutron guide from a pulsed source, and rotate the crystal axis synchronized to the time-of-flight spectrum of the incident cold neutrons.
Contract notice: laser ablation time-of-flight mass spectrometer.
3]He has a 1/v dependence, where v is the neutron velocity, which is used to determine the absolute beam polarization through a time-of-flight (TOF) measurement.
The PEO/PPO/PEO work relied on size-exclusion chromatography (SEC) to narrow the polydispersity of the polymer followed by time-of-flight (TOF) MS/MS for structural and molecular mass analysis.