Medical image processing device and medical image processing method, applying weighted penalty term in iterative approximation

摘要

With respect to projection data covering a plurality of sites, in order to create a medical image in which a uniform noise reduction effect is achieved for all sites within the projection data, an arithmetic device (5) determines one or more of proper subsets on the basis of scanning conditions and reconstruction conditions (step 2). Next, the arithmetic device (5) calculates a penalty-term weight for each proper subset on the basis of a detector output weight corresponding to a set element contained in the proper subset (step 3). Then, the arithmetic unit (5) performs an iterative approximation by using the penalty-term weight for each proper subset (step 4).

主权项

1. A medical image processing device configured to execute at least one of (i) a projection data correcting process and (ii) an image reconstruction process, using an iterative approximation method in which a detector output weight which is a weight in accordance with an output of a detector and a penalty-term are included in an evaluation function, comprising:
a proper subset determining unit configured to determine one or more proper subsets, on the basis of scanning conditions and reconstruction conditions, from a universal set of which the information for uniquely specifying combination of a channel of the detector, a row of the detector and a view which is the acquisition unit of the projection data is a set element; a penalty-term weight calculating unit configured to calculate, for each of the proper subsets, a penalty-term weight which is a weight multiplied to the penalty term on the basis of the detector output weight corresponding to the set element included in the proper subset; and an iterative approximation method executing unit configured to execute the iterative approximation method using the penalty-term weight for each of the proper subsets.