High-precision Absolute Value Measurement of Reflection by Time Domain OCT

2018 ◽  
Vol 138 (5) ◽  
pp. 198-203
Author(s):  
Masayuki Tanaka ◽  
Tatsuo Shiina
Keyword(s):  
High Precision ◽  
Time Domain ◽  
Absolute Value ◽  
Value Measurement ◽  
Time Domain Oct

scholarly journals A Double Transducer for High Precision Ultrasonic Time-Domain Reflectometry Measurements

Sensors ◽  
2015 ◽  
Vol 15 (7) ◽  
pp. 15090-15100 ◽  
Author(s):  
Sam Stade ◽  
Tuomas Hakkarainen ◽  
Mari Kallioinen ◽  
Mika Mänttäri ◽  
Tuure Tuuva
Keyword(s):  
High Precision ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Ultrasonic Time

scholarly journals Comparison of Fourier-Domain and Time-Domain Optical Coherence Tomography in the Measurement of Thinnest Corneal Thickness in Keratoconus

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Chunxiao Wang ◽  
Xueying Xia ◽  
Bishan Tian ◽  
Shiyou Zhou
Keyword(s):  
Optical Coherence Tomography ◽  
Time Domain ◽  
Pearson Correlation ◽  
Corneal Thickness ◽  
Intraclass Correlation ◽  
Fourier Domain ◽  
Optical Coherence ◽  
Highly Correlated ◽  
Time Domain Oct

Objective. To compare fourier-domain optical coherence tomography (FD-OCT) and time-domain OCT (TD-OCT) in the determination of thinnest corneal thickness (TCT).Methods. This study included 55 keratoconus patients and 50 healthy volunteers. The RTVue-OCT (FD-OCT) and Visante-OCT (TD-OCT) were used for the measurement of the TCT. Three consecutive scans were performed. The comparison and agreement between the two modalities were analyzed by pairedt-test, the Pearson correlation, intraclass correlation coefficient (ICC), and Bland-Altman plots. intraobserver repeatability was analyzed by the intraobserver within-subject standard deviation (S(w)), coefficient of variation (CV(w)), and ICC.Results. The TCT value of normal corneas was higher by RTVue-OCT (530.4 ± 19.7 μm) than Visante-OCT (521.5 ± 18.3 μm) (p<0.001). For keratoconus eyes, the TCT was 425.0 ± 58.2 μm and 424.4 ± 55.7 μm (difference being 0.6 ± 10.2 μm,p=0.604). Strong correlation (r= 0.938∼0.985) (ICC = 0.915–0.984) was observed between the two OCTs, and each OCT exhibited excellent repeatability in determining the TCT in all subjects (ICC = 0.984–0.994).Conclusions. The values of TCT obtained from RTVue-OCT and Visante-OCT were highly correlated; however, the two values were different. Both OCT instruments exhibited good intraobserver reliability. The existence of systematic differences suggested that the two instruments cannot be used interchangeably.

A high-precision time-domain RRAM state control approach

2018 ◽  
Vol 74 ◽  
pp. 94-105 ◽  
Author(s):  
A.A. Bagheri-Soulla ◽  
M.B. Ghaznavi-Ghoushchi
Keyword(s):  
High Precision ◽  
Time Domain ◽  
State Control ◽  
Control Approach ◽  
Precision Time

scholarly journals Comparison of Retinal Nerve Fiber Layer Thickness Measurements in Healthy Subjects Using Fourier and Time Domain Optical Coherence Tomography

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Isabel Pinilla ◽  
Elena Garcia-Martin ◽  
Miriam Idoipe ◽  
Eva Sancho ◽  
Isabel Fuertes
Keyword(s):  
Nerve Fiber ◽  
Retinal Nerve Fiber Layer ◽  
Time Domain ◽  
Healthy Subjects ◽  
Fourier Domain ◽  
Average Thickness ◽  
Fiber Layer ◽  
Nerve Fiber Layer ◽  
Fourier Domain Oct ◽  
Time Domain Oct

Purpose. To compare the retinal nerve fiber layer (RNFL) measurements using two different ocular coherence tomography (OCT) devices: Cirrus Fourier domain OCT and Stratus time domain OCT. To analyze reproducibility of Fourier domain measurements in healthy subjects.Methods. One hundred and thirty-two eyes of 132 healthy subjects were scaned on the same day with both instruments, separated by 10 minutes from each other. Thickness of quadrant, average and the 12 different areas around the optic nerve were compared between Cirrus and Stratus. Repeatability, intraclass correlation coefficients (ICCs), and coefficients of variation (COVs) were calculated in RNFL measurements provided by Fourier domain device.Results. The average thickness in the optic cube was 95.50 μm using Cirrus and 97.85 μm using Stratus. Average thickness and temporal quadrant showed significant differences using Cirrus and Stratus methods. Reproducibility was better with Fourier domain OCT (mean COV of 4.54%) than with Stratus time-domain OCT (mean COV of 5.57%).Conclusions. Both scan options give reproducible RNFL thickness measurement, but there are differences between them. Measurements obtained using Fourier domain device show better reproducibility.

scholarly journals Axial-lateral parallel time domain OCT with optical zoom lens and high order diffracted lights for variable imaging range

2007 ◽  
Vol 15 (8) ◽  
pp. 5208 ◽  
Author(s):  
Yuuki Watanabe ◽  
Yasutoki. Takasugi ◽  
Kazuhiko Yamada ◽  
Manabu Sato
Keyword(s):  
Time Domain ◽  
High Order ◽  
Zoom Lens ◽  
Parallel Time ◽  
Time Domain Oct

scholarly journals High-precision QEC -value measurement of the superallowed β+ emitter Mg22 and an ab initio evaluation of the A=22 isobaric triplet

2017 ◽  
Vol 96 (5) ◽  
Author(s):  
M. P. Reiter ◽  
K. G. Leach ◽  
O. M. Drozdowski ◽  
S. R. Stroberg ◽  
J. D. Holt ◽  
...  
Keyword(s):  
Ab Initio ◽  
High Precision ◽  
Value Measurement

Observation of flow-dependent blood optical inhomogeneity using joint Spectral and Time domain OCT

2011 ◽  
Author(s):  
D. Bukowska ◽  
M. Szkulmowski ◽  
Sz. Tamborski ◽  
D. Szlag ◽  
I. Gorczynska ◽  
...  
Keyword(s):  
Time Domain ◽  
Optical Inhomogeneity ◽  
Time Domain Oct
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