disc area


Also found in: Acronyms.

disc area

disc area
The total area of the circle swept by the main rotor of a helicopter as it rotates.
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References in periodicals archive ?
Intervertebral disc area was selected for this purpose as it is enclosed by the vertebral bone.
To tackle the fresh problem, Moriarty had another epidural injection straight into the disc area to heal the slice and the leak.
Polymorphism rs7916697 in ATOH7 was reported to be an important genetic determinant of optic disc size in a meta-analysis consisting of UK and Australian cohort (p=1.3x[10.sup.-10]) that explained 1.7% variation in the optic disc area in the UK cohort [6], implicating its pathophysiological role in POAG.
Therefore optic disc area contains more detailed information that can be exploited in its identification.
Seed point was implanted inside optic disc area: all vessels are sprawling out from optic disk, so the same pixel intensity with blood vessel was determined as seed point and we performed region growing.
(a) Cross-sectional OCT image at a yellow line in (c), where green lines in (a) show the detected layer information for calculating the retinal nerve fiber layer (RNFL) thickness; (b) RNFL thickness map, where the number indicates the thickness in micrometers in 12 sectors around the optic disc and cyan and magenta circles show automatically detected disc and cup boundaries; (c) a color fundus photo of the optic disc area.
OCT can be used to analyze and measure not only the peripapillary RNFL thickness [3-5] but also topographic parameters of the ONH, including the disc area, neuroretinal rim area, and the cup-to-disc ratio [6].
(23,24) NAION patients have small disc area, no or minimal physiological cupping, and characteristic disc structures such as "crowded disc", in which there is an excessive number of central retinal vein branches within the disc.
The following inclusion criteria were to be met for the study purposes: 1) eyes with best corrected visual acuity 0.2 or larger; 2) eyes with a refraction error less than 5 and astigmatism less than 3 diopters; 3) history of acute NAION occurrence no more than 4 months prior to the study; 4) eyes with normal disc area (1.69-2.82 [mm.sup.2]); and 5) subjects with reliable test results of visual field and HRT II.
Superficial and deep retinal vascular density on macular and optic disc area were calculated as previously described in literature.[sup][17] Binary images of vascular networks were created using an automated thresholding algorithm.