1Application for patent filed June 07, 1995. According to
the appellant, this application is a continuation o
08/405,396, filed March 15, 1995, w07/991,050, filed December
15, 1992.
slices. In particular, as shown in Figure 1, gantry 22
rotates and X-ray source 24 and top and bottom detector arrays
26 and 28 are disposed on the gantry 22 in diametrically
opposite positions. The data processed for a set of paired
views taken by the respective detectors 26 and 28 is
interpolated for each pair of views to the midplane by the
block 74, and is then weighted to provide raw reconstructed
image data for further processing. Representative
independent claim 17 is reproduced as follows:
17. A helical computerized tomography system in which an
x-ray tube for radiating an x-ray and an object irradiated
with the x-ray are relatively rotated with respect to each
other, and the x-ray tube and the object are relatively moved
along an axial direction of the object, thus performing a
helical scan on the object, and the x-ray transmitted through
the object is detected by an x-ray detector, thus
reconstructing a tomograph at a desired position of a
reference plane of reconstruction in the axial direction, said
apparatus comprising:
a radiation detector arrangement having first and second
array of detectors disposed along the axial direction of the
object for collecting transmitted data of the x-ray
transmitted through the object during the helical scan;
data extracting means for extracting first and second
transmitted data each collected by said first and second
arrays of detectors, the first and second transmitted data
correspond to a same detector angle but different axial
positions and the data extracting means extract one of the
first and second transmitted data closer to the reference
3
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