title: New class of pulsed Doppler US ambiguity at short ranges.
abstract: A form of range ambiguity in Doppler ultrasound has been identified. It occurs when a high pulse repetition frequency (prf) is used with a superficial range gate. "Phantom" range gates are then generated at depths beyond the desired range gate, and these may produce artifactual signals. Extremely high prf values should not normally be used, and duplex machines should be programmed to display phantom range gates wherever they fall within the displayed field of view.
authors.affiliation: Ultrasonics Institute, Department of Community Services and Health, Chatswood, New South Wales, Australia.
authors.forename: R W
authors.initials: RW
authors.lastname: Gill
authors.forename: M B
authors.initials: MB
authors.lastname: Kossoff
authors.forename: G
authors.initials: G
authors.lastname: Kossoff
authors.forename: K A
authors.initials: KA
authors.lastname: Griffiths
mesh_terms: D006801:Humans; D014465:Ultrasonics; D014463:Ultrasonography