CT computed tomograph

Details CT computed tomograph CT computed tomograph

1989-02-16

1990-03-20

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

250341, 250350, 128633, A61B 500

Patent

active

049104047

ABSTRACT:
A CT computed tomograph comprises a scanner (51) which surrounds a living body of a person to be examined. Ultrashort light pulses of the ith wavelength are applied to the living body from a sample light transmitting path (80k) corresponding to the kth cell of this scanner and the sample light pulses received by a sample light receiving path (81l) corresponding to the lth cell and reference light pulses transmitted from a reference light path (79) and a delay light path (78) are converged by a converging lens (75). A CPU(64) counts photons outputted from a photomultiplier (22) based on the converged light pulses and calculates an average value by averaging a predetermined number of count values. A delay amount of the reference light pulses through the delay light path (78) is changed based on the average value and, based on delay time and an average value in the delay time, a photon count value S.sub.0i (k, l) obtained by counting the photons of the second harmonic when the delay amount of the reference light pulses is a predetermined value is stored. Based on the photon average value S.sub.0i (k, l), a tomographic image of the metabolism of the living body is evaluated.

REFERENCES:
patent: 4281645 (1981-08-01), Jobsis
"Optical Diffusion in Blood" by C. C. Johnson, IEE Transaction on Bio-Medical Engineering, vol. BME-17, No. 2, 1970, pp. 129-133.

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