helical scan


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helical scan

n
(Electronics) (modifier) denoting a recording technique used with video tapes in which the recorded tracks on the tape are segments of a helix: a helical-scan tape.
References in periodicals archive ?
To improve workflow for advanced CTA scans while potentially reducing IV contrast and radiation dose, the systems offer Volumetric Scan Mode that enables providers to acquire anatomical and functional data in a single heartbeat, as well as three phase Variable Helical Pitch (vHP3), which automatically changes from an ECG-gated to a non-ECG-gated acquisition during a single helical scan.
His recent achievements include: providing the first physical explanation for the role of a prominent flap seen in mammalian ears in 2004; discovery of a novel helical scan in the ear directivity of a bat in 2006; discovery of frequency-selective beam-forming by virtue of resonances in noseleaf furrows of a bat, an entirely new bioacoustic paradigm in 2006; establishing the first immediate and quantitative characterization of the spatial information created by a mammal's outer ear in 2007; and now uncovering the acoustic effect of non-rigid ear deformations in bats.
Toshiba America Medical Systems (Tustin, CA) introduced 160-detectorrow helical scanning, which is the helical scan mode with the largest number of detector rows.
AIT is a helical scan technology with a 1" per second transfer speed, while linear tape format specifies a very high transfer rate of 295" per second.
5-inch form factor, the tape drives use helical scan technology to increase recording density for lower media costs and increased efficiency.
In addition to high-definition, long-duration digital videotape for home and broadcast use, applications currently being developed include high-capacity floppy disks, data and video storage tape for home network servers and magnetic storage tape for helical scan and linear recording.
In recent years, two classes of tape recorder have dominated the high-altitude area -- the 1-in, transverse-scan DCRsi family from Ampex Data Systems (Redwood City, CA) and the 19mm helical scan ANSI ID-1 products from Enertec (Clamart, France) and Metrum-Datatape (Monrovia, CA).
VXA is a helical scan technology like those used by Exabyte Corp and Sony Corp, but is the only media not to be read by a streamer, Beavers explained.
Superior helical scan technology for greater reliability
At the Massachusetts Institute of Technology's Haystack Observatory in Westford, MA, Hans Hinteregger and Alan Rogers are working on an advanced system that may push linear recording technology beyond that achievable with helical scan techniques, like VHS.
To improve workflow and make TAVR planning more efficient, the systems feature wide detector Volumetric Cardiac capabilities and Toshibas Adaptive Diagnostics technology like the Variable Helical Pitch (vHP), which automatically changes from an ECG-gated to a non-ECG-gated acquisition during a single helical scan, reducing IV contrast and radiation dose.
Sony's SuperAIT helical scan half-inch technology has yet to make a break-through against LTO and SDLT with fewer than 1000 drives shipped in 2004.