title: Investigation of a phase-only correlation technique for anatomical alignment of portal images in radiation therapy.
abstract: A new image registration algorithm based on phase-only correlation is applied to portal images in radiation therapy to detect translational shift. The phase-only correlation shows a sharp peak in the correlation distribution as compared to the broad peak computed from conventional correlation using fast Fourier transform. In this paper, the algorithm of phase-only correlation is described and its applicability and robustness are tested when applied to portal images used in clinical radiation oncology. The results achieved give evidence that the phase-only correlation will deliver an alternative approach for image registration and image comparison, that may be applicable in routine clinical practice.
authors.affiliation: Department of Radiation Oncology, University Hospital, SUNY at Stony Brook 11794, USA.
authors.forename: J Z
authors.initials: JZ
authors.lastname: Wang
authors.forename: L E
authors.initials: LE
authors.lastname: Reinstein
authors.forename: J
authors.initials: J
authors.lastname: Hanley
authors.forename: A G
authors.initials: AG
authors.lastname: Meek
mesh_terms: D000465:Algorithms; D055592:Biophysical Phenomena; D001703:Biophysics; D006801:Humans; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods* / Q000706:statistics & numerical data