Patent ID: 11940578
Assignee: INSERM (INSTITUT NATIONAL DE LA SANTé ET DE LA RECHERCHE MéDICALE)
Field: Medical technology (Instruments)
Classification: CPC G  A | IPC A  G

Claim 19:
20. A non-transitory computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out:

a) acquiring N successive positron emission tomography (PET) low resolution images Γi and simultaneously, N successive Ultrafast Ultrasound Imaging (UUI) images Ui of a moving object;
b) determining from each UUI image Ui, the motion vector fields Mi that corresponds to the spatio-temporal geometrical transformation of the motion of the object;
c) obtaining a final estimated high resolution image H of the object by iterative determination of a high resolution image Hn+1 obtained by applying several correction iterations to a current estimated high resolution image Hn, n being the number of iteration, starting from an initial estimated high resolution image H1 of the object, each correction iteration including at least:

i) warping said estimated high resolution image Hn using the motion vector fields Mi to determine a set of low resolution reference images Lni;
ii) determining a differential image Di by difference between each PET image Γi and the corresponding low resolution reference image Lni;
iii) warping back said differential images Di using the motion vector fields Mi and averaging the N warped back differential images to obtain a high resolution differential image;
iv) determining the high resolution image Hn+1 by correcting said high resolution image Hn using said high resolution differential image;
d) applying the motion vector fields Mi of each UUI image Ui to said final high resolution image H.