Spiral scan computed tomography apparatus and method for operati

Details Spiral scan computed tomography apparatus and method for operati Spiral scan computed tomography apparatus and method for operati

1995-02-23

1996-06-25

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, 36441316, A61B 603

Patent

active

055307310

ABSTRACT:
A computed tomography method and apparatus conduct a spiral scan of a subject wherein non-uniformities of noise and topical resolution are greatly reduced. A power spectrum S.sub.o for interpolated projections is identified, from which a frequency characteristic H(f,.theta.), of an optimum filter for the projections interpolated from complementary data is determined, with ##EQU1## with .sigma..sub.o.sup.2 being the variance of the quantum noise associated with a projection and w(.theta.) being the spiral weighting.

REFERENCES:
patent: 5166961 (1992-11-01), Brunnett et al.
"Spiral Volumetric CT with Single-Breath-Hold Technique, Continuous Transport, and Continuous Scanner Rotation," Kalender et al., Radiology, vol. 176, No. 1, Jul. 1990, pp. 181-183.

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