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.

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

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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.

What is Time of Flight camera sensor and what does it do

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.

Measurement of parity violation in np capture: the NPDGamma experiment

The spin-flipper efficiency was taken to be 100 % over the analyzed time of flight range.

Commissioning of the NPDGamma detector array: counting statistics in current mode operation and parity violation in the capture of cold neutrons on [B.sub.4]C and [.sup.27]Al

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