X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1994-11-25
1996-08-06
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378901, 36441318, A61B 603
Patent
active
055442129
ABSTRACT:
An x-ray source (12) is mounted to a rotatable gantry (16). The x-ray source irradiates an examination region (14) with penetrating radiation as (i) the x-ray source rotates around the examination region and (ii) a patient coach (30) moves a patient axially through the examination region. Detectors (24) positioned on an opposite side of the examination region converts radiation which has traversed the examination region along spiral paths (80). Data from the detectors are collected and stored (40) in spiral data sets. In the prior art spiral data on either side of a thin slice central plane was interpolated into a thin slice data set, each thin slice data set was reconstructed into a thin slice image, and several thin slice images were combined to make a thick slice image with significant partial volume artifacts. By distinction, an integrating interpolator (42) weights (88) data values in several spiral sets in accordance with a weighting values W.sub.1, W.sub.2, . . . and the weighted sets are combined (90) to form a thick slice data set. The thick slice data set is reconstructed (50) into a thick slice image having reduced partial volume artifacts.
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Bruce David Vernon
Picker International Inc.
Porta David P.
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