| 摘要 |
PROBLEM TO BE SOLVED: To reconstitute an image in each prescribed slice from projection data by correcting a spiral summation factor according to a specific expression. SOLUTION: A system forming the tomograph is image of an object by using data collected from a detector of a single row in spiral scanning is provided with a processor which forms a spiral summation factor, forms a corrected summation factor based on the formed spiral summation factor and programs the corrected summation factor so as to apply it to the data and the corrected summation factor Wf (β, γ) is shown in an expression. Provided that, in the expression, γ is the angle of a detector, β is a gantry angle, Wf (β, γ) is a spiral summation coefficient, Δγis a shift along a view angle direction, h (i) is summation to be applied to the i-th deformation after the shift to obtain substantially the reduction of a stationary noise and the half-value width (FWHM) of an image is the function of a spiral pitch. |
