With the objective of evaluating whether a dose is excessive for a subject, such a dose that image noise reaches less than or equal to a predetermined value is estimated upon an axial scan on the basis of projection data acquired by a scout scan. The dose is set as a maximum dose. An area other than air, of an image obtained by the axial scan is partitioned into a plurality of small areas i. Image noises N(i) at the respective small areas i are calculated. A warning image G 1 in which all of pixel values of pixels in small areas in which the image noises N(i) are less than or equal to a predetermined value, are substituted with pixel values expressed in black level, is created and displayed.

Dose evaluating method and x-ray ct apparatus
Application Number
Publication Number
Application Date
December 1, 2005
Publication Date
June 7, 2006
Gohno Makoto
cheng tianzheng chen jingjun
Ge Med Sys Global Tech Co
A61B 06/03