Determining the position range of the heart from a sequence of projection images using 1-D pseudo motion analysis
AssigneeSiemens Corporate Research, Inc.
InventorsBeilei Xu, Jin-Shin Chou, Jianzhong Qian
Life of this patent
Estimating the term…
Abstract
This invention provides a method for determining the position range of the heart from a sequence of projection images which are acquired for 3-D volume reconstruction, such as SPECT myocardial projection data. The essence of this invention is the use of 1-D pseudo motion analysis so that the detection is insensitive to the image intensity distribution. Heart position is determined by comparing the sampled heart motion against a standard heart motion and determining similarities between the two as an indication of the position range of the sampled heart including the proximate center, upper and lower limits of motion.
Claims23
A method for determining a position range of a heart from a sequence of projection images of said heart indicative of projecting angles and spatial locations of said heart, comprising the steps of:
- generating a predetermined number of said projection images of said heart at multiple said projection angles for deriving a one dimensional pseudo motion analysis of said heart;
- comparing said one dimensional pseudo motion analysis of said heart against a standard one dimensional pseudo motion for determining a variance of said one dimensional pseudo motion analysis of said heart from said standard one dimensional pseudo motion;
- and,
- determining said position range of said heart from said variance.
A method for determining a position range of a heart from a sequence of projection images of said heart having intensity distributions indicative of projecting angles and spatial locations of said heart, comprising the steps of:
- creating a one to one correspondence of intensity feature to position mapping of maximum intensity values of said projection images;
- comparing said intensity feature to position mapping against a standard one dimensional pseudo motion for determining a variance of said one dimensional pseudo motion of said heart from said standard one dimensional pseudo motion;
- and,
- determining said position range of said heart from said variance.
A method for determining the position range of a heart from a sequence of projection images having intensity distributions indicative of projecting angle and spatial location of said heart to rotation axis of said projecting angle, comprising the steps of:
- obtaining a predetermined number of said projection images of said heart from multiple said projection angles about said heart;
- forming said predetermined number of projection images into a matrix of predetermined rows and columns;
- recording for each said predetermined row the column position of the projection image with a maximum intensity value for generating an intensity feature to position mapping;
- calculating a variance of difference for said intensity feature to position mapping from a standard one dimensional pseudo motion;
- and,
- determining the position range of said heart from said variance of difference.
Dependencies are inferred from the claim text.