title: Dynamic 2D ultrasound and 3D CT image registration of the beating heart.
abstract: Two-dimensional ultrasound (US) is widely used in minimally invasive cardiac procedures due to its convenience of use and noninvasive nature. However, the low quality of US images often limits their utility as a means for guiding procedures, since it is often difficult to relate the images to their anatomical context. To improve the interpretability of the US images while maintaining US as a flexible anatomical and functional real-time imaging modality, we describe a multimodality image navigation system that integrates 2D US images with their 3D context by registering them to high quality preoperative models based on magnetic resonance imaging (MRI) or computed tomography (CT) images. The mapping from such a model to the patient is completed using spatial and temporal registrations. Spatial registration is performed by a two-step rapid registration method that first approximately aligns the two images as a starting point to an automatic registration procedure. Temporal alignment is performed with the aid of electrocardiograph (ECG) signals and a latency compensation method. Registration accuracy is measured by calculating the TRE. Results show that the error between the US and preoperative images of a beating heart phantom is 1.7 +/-0.4 mm, with a similar performance being observed in in vivo animal experiments.
authors.affiliation: Imaging Research Laboratories, Robarts Research Institute, London, ON N6A5K8, Canada. edward.huang@sickkids.ca
authors.forename: Xishi
authors.initials: X
authors.lastname: Huang
authors.forename: John
authors.initials: J
authors.lastname: Moore
authors.forename: Gerard
authors.initials: G
authors.lastname: Guiraudon
authors.forename: Douglas L
authors.initials: DL
authors.lastname: Jones
authors.forename: Daniel
authors.initials: D
authors.lastname: Bainbridge
authors.forename: Jing
authors.initials: J
authors.lastname: Ren
authors.forename: Terry M
authors.initials: TM
authors.lastname: Peters
mesh_terms: D000818:Animals; D002138:Calibration; D004452:Echocardiography / Q000379:methods*; D004562:Electrocardiography; D006321:Heart / Q000033:anatomy & histology / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology; D021621:Imaging, Three-Dimensional / Q000379:methods*; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D025321:Surgery, Computer-Assisted / Q000379:methods*; D013552:Swine; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography / Q000379:methods*