| 摘要 |
A method for reconstructing images of a subject in a variable-angle helical-scan CT scanner (20), said scanner (20) including an X-ray tube (28), mounted for rotation about a rotation axis, a detector array (30) having one or more rows of detector elements (23) that generates signals responsive to X-rays incident thereon, ad a bed (24), translatable along a translation axis (34), on which bed the subject is placed, the method comprising: angling the translation axis (34) and the rotation axis at an acute angle relative to one another; rotating the X-ray tube (28) about the rotation axis while translating the bed (24) along the translation axis (34) through a plane of rotation of the tube, whereby the X-ray tube (28) describes a helical path relative to the subject; acquiring first and second views of the subject at the same effective rotational angle about the axis of rotation, said views comprising X-ray attenuation data received from elements of the array; producing a planar corrected image slice by interpolation of the data in different views, wherein the data is generated by non-corresponding elements in the different views; and repeating the above steps at respective positions at a plurality of rotational angles of the X-ray tube (28).
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