helical scanning


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helical scanning

[′hel·ə·kəl ′skan·iŋ]
(communications)
A method of facsimile scanning in which a single-turn helix rotates against a stationary bar to give horizontal movement of an elemental area.
(electronics)
A method of recording on videotape and digital audio tape in which the tracks are recorded diagonally from top to bottom by wrapping the tape around the rotating-head drum in a helical path.
(engineering)
A method of radar scanning in which the antenna beam rotates continuously about the vertical axis while the elevation angle changes slowly from horizontal to vertical, so that a point on the radar beam describes a distorted helix.
References in periodicals archive ?
Using standard 64-detector row helical scanning as the benchmark, the effective radiation dose was reduced by 91 percent from 35.
Helical scanning refers to a volume acquisition of data taken during a single breath-hold, followed by reconstruction according to parameters programmed into the computer by the CT technologist.
introduces 160-detector row helical scanning,which is the helical scan mode with the largest number of detector rows available at this year's Radiological Society of North America (RSNA) annual meeting, held in Chicago, Nov.
Variable Helical Pitch (vHP)(a) scanning that allows non-stop helical scanning while performing multiple exams.
Toshiba remains at the forefront of CT innovation, having introduced helical scanning, Continuous Imaging, and 4 channel, 0.
Sony's SVO-1330 recorder utilizes a double azimuth, four-head helical scanning system, provides a S/N ratio of 44dB, and includes an APCII (Adaptive Picture Control II) function to automatically optimize recording and playback performance.
Toshiba pioneered helical scanning, Aspire Continuous Imaging (CI) and CT fluoroscopy, which opened new application areas for CT procedures.
Owing to the wide use of CT helical scanning, which Toshiba originally pioneered, the number of examinations per day and the number of images taken per examination have increased, increasing the thermal burden on the X-ray tube.
It is particularly suited for institutions which require the high-performance capabilities of helical scanning and the image quality of solid-state detectors, but due to space limitations have little siting flexibility," says Dionne.
Helical scanning is of course a more taxing procedure for the system," said Dr.
Specific advances include helical scanning in CT, fast spin echo in MRI and color flow Doppler in ultrasound.
Recent advances include helical scanning in CT, fast spin echo in MRI and color flow Doppler in ultrasound.