title: Visualisation of 4-D colour and power Doppler data.
abstract: Mechanically scanned, cardiac-gated, 4-D colour Doppler and power Doppler data were acquired and rendered using multiplanar slice display, surface-fitting (S-F) and direct volume rendering (DVR), with interactive viewpoint control or tool command language (Tcl)-scripted generation of animation sequences across the cardiac cycle. S-F applied the marching cubes algorithm within a YCbCr colour space to extract time-varying Doppler regions; supplementally generated surfaces enclosed all regions across the full cardiac cycle, partially to alleviate the problem of incomplete vessel filling. DVR used integrated intensity, maximum intensity and front-to-back projection; the latter applied an opacity function to the Cb, Cr and Y colour channels to control the appearance of the blood flow signal relative to the background B-mode image. Our most detailed display was a hybrid approach that combined multiplanar slicing and DVR.
authors.affiliation: School of Information Technology, Griffith University, Gold Coast, Australia.
authors.forename: Mike G
authors.initials: MG
authors.lastname: Jones
authors.forename: Jacqueline A
authors.initials: JA
authors.lastname: Shipley
authors.forename: Teresa M
authors.initials: TM
authors.lastname: Robinson
mesh_terms: D000465:Algorithms; D016477:Artifacts; D018618:Echocardiography, Doppler, Color / Q000379:methods*; D019561:Echocardiography, Four-Dimensional / Q000379:methods*; D019560:Echocardiography, Three-Dimensional; D006801:Humans; D007090:Image Interpretation, Computer-Assisted