Multiple detector ring spiral scanner with relatively adjustable

Details Multiple detector ring spiral scanner with relatively adjustable Multiple detector ring spiral scanner with relatively adjustable

1994-01-10

1996-01-16

Hayes, Gail O.

X-ray or gamma ray systems or devices

Photographic detector support

Dental

378 4, 378 16, 378151, 378153, 378901, G06F15900

Patent

active

054854938

ABSTRACT:
A CT scanner (10) has an x-ray source (12) which transmits a plurality (N) of x-ray fans across an examination region (14) to a plurality of rings of radiation detectors (28). An adjustable septum (80) adjusts a gap between the fan beams and outer collimators (82) adjust the width of the fan beams such that the effective spacing and width are adjusted. The x-ray source rotates around the examination region as a subject support (32) moves longitudinally through the examination region such that the x-ray fans move along interleaved spiral trajectories. Radiation attenuation data from each of the x-ray fans is combined and reconstructed into a plurality of images along parallel slices orthogonal to the longitudinal axis. The spacing between the x-ray beams is adjusted relative to the effective pitch of the spirals such that the leading edges of the x-ray fans intersect a common transverse plane at 180.degree./N angular intervals around the longitudinal axis.

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