spiral scan

spiral scan

spiral scan
A radar scan pattern in which the beam is rotated out from and back to the centerline in a circular motion in the vertical plane. This pattern is applicable to target acquisition radars, providing range, relative azimuth, and elevation data.
References in periodicals archive ?
The patients underwent image acquisition in the electrocardiogram (ECG)-triggered sequential scan mode, retrospective ECG-gated spiral scan mode, or high-pitch spiral scan mode, as appropriate.
30 degree tilt with the possibility of spiral scan, which is necessary to teach and research the optimal skanprotokoller for cerebralskanning.
The NF-FF transformation with spherical spiral scan [28], using the two-bowls modelling (Fig.
At last, the FF patterns in the principal planes E and H reconstructed from the NF set of measurements acquired through the spherical spiral scan are compared in Figs.
And CARE Dose 4D, Siemens' real time dose modulation, guarantees an unparalleled combination of maximum image quality at minimum dose for every patient in every spiral scan.
The parachute rotates the canted submunition, producing a spiral scan of the ground.
An infrared sensor searches a 30-degree cone, giving a spiral scan of the ground below the weapon, and a self-forging fragment is fired at the top of the target.
The spiral scan is like a conical scan, except that the angle of the cone increases or decreases, as shown in Figure 2.
The parameters such as pitch, collimation width, and table speed are related in a spiral scan process and affect the imaging quality outcome and radiation dose to the patients by varying degrees.
The results of the test injection are used to set injection parameters for the main spiral scan.
The practice of taking overlapping scans in conventional CT for high-quality 3-D displays is replaced by the ability to calculate arbitrarily many overlapping images from 1 spiral scan without renewed exposure.
The spiral and the expressions of the parameter [xi] for describing it and the related phase factor [gamma], can be determined according to the unified theory of spiral scans.