Patent ID: 6404844
Filing Date: 2002-06-11
Classification: A61B

Abstract:
A tomographic imaging scan condition determining method utilizing a CT apparatus comprising a multi-detector having a plurality of detector rows arranged in parallel and helically scanned to produce a tomographic image having an image thickness, wherein said method comprises the steps of:priorly storing in table form a dose correction factor according to at least a radiation beam width used in said CT apparatus and imaging carrier movement speed for different image thicknesses for obtaining tomographic images which have imaging noise within a range of acceptable imaging noise; determining a provisional radiation dose for obtaining said tomographic image by a single slice CT using a single slice radiation dose determining algorithm; obtaining from said table form stored dose correction factor corresponding to a selected movement speed and beam width for a particular image thickness; correcting said provisional radiation dose by multiplying with said obtained dose correction factor to provide a corrected radiation dose; and determining tomographic imaging scan conditions for obtaining said corrected radiation dose so as to obtain tomographic images with image noise within said acceptable range.