Tomografi keselarasan optik: Perbedaan antara revisi

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Kelebihan utama OCT adalah:
* Gambar di bawah permukaan hidup-hidup dengan resolusi mendekati mikroskopik
* Pencitraan segera dan langsung dari morfologi jaringan
* Tanpa penyiapan sampel atau subyek
* Tanpa radiasi yang menyebabkan ionisasi
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OCT delivers high resolution because it is based on light, rather than sound or radio frequency. An optical beam is directed at the tissue, and a small portion of this light that reflects from sub-surface features is collected. Note that most light is not reflected but, rather, scatters off at large angles. In conventional imaging, this diffusely scattered light contributes background that obscures an image. However, in OCT, a technique called interferometry is used to record the optical path length of received photons allowing rejection of most photons that scatter multiple times before detection. Thus OCT can build up clear 3D images of thick samples by rejecting background signal while collecting light directly reflected from surfaces of interest.
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[[FileBerkas:OCT B-Scan Setup.GIF|thumb|375px|Fig. 2 Typical optical setup of single point OCT. Scanning the light beam on the sample enables non-invasive cross-sectional imaging up to 3 mm in depth with micrometer resolution.]]
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[[FileBerkas:Full-field OCT setup.png|thumb|375px|Fig. 1 Full-field OCT optical setup. Components include: super-luminescent diode (SLD), convex lens (L1), 50/50 beamsplitter (BS), camera objective (CO), CMOS-DSP camera (CAM), reference (REF), and sample (SMP). The camera functions as a two-dimensional detector array, and with the OCT technique facilitating scanning in depth, a non-invasive three dimensional imaging device is achieved.]]
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[[FileBerkas:Fd-oct.PNG|thumb|375px|Fig. 4 Spectral discrimination by fourier-domain OCT. Components include: low coherence source (LCS), beamsplitter (BS), reference mirror (REF), sample (SMP), diffraction grating (DG) and full-field detector (CAM) acting as a spectrometer, and digital signal processing (DSP)]]
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[[FileBerkas:Ss-oct.PNG|thumb|375px|Fig. 3 Spectral discrimination by swept-source OCT. Components include: swept source or tunable laser (SS), beamsplitter (BS), reference mirror (REF), sample (SMP), photodetector (PD), and digital signal processing (DSP)]]
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As of 2014, attempts have been made to use optical coherence tomography to identify root canals in teeth, specifically canal in the maxillary molar, however, there's no difference with the current methods of dental operatory microscope.<ref>{{cite journal |last1=Iino |first1=Y |last2=Ebihara |first2=A |last3=Yoshioka |first3=T |last4=Kawamura |first4=J |last5=Watanabe |first5=S |last6=Hanada |first6=T |last7=Nakano |first7=K |last8=Sumi |first8=Y |last9=Suda |first9=H |title=Detection of a second mesiobuccal canal in maxillary molars by swept-source optical coherence tomography |journal=Journal of Endodontics |date=November 2014 |volume=40 |issue=11 |pages=1865–1868 |doi=10.1016/j.joen.2014.07.012 |pmid=25266471 }}</ref>{{primary source inline|reason=Investigational study in which the authors collected the imaging data. |date=October 2016}} Research conducted in 2015 was successful in utilizing a smartphone as an OCT platform, although much work remains to be done before such a platform would be commercially viable.<ref>{{cite web |first1=Hrebesh M. |last1=Subhash |first2=Josh N. |last2=Hogan |first3=Martin J. |last3=Leahy |date=May 2015 |title=Multiple-reference optical coherence tomography for smartphone applications |website=SPIE |url=http://spie.org/x113407.xml |doi=10.1117/2.1201503.005807 }}</ref>
 
== See also ==
* [[Angle-resolved low-coherence interferometry]]
* [[Ballistic photon]]
* [[Interferometry]]
* [[Leica Microsystems]]
* [[Novacam Technologies]]
* [[Optical heterodyne detection]]
* [[Optical projection tomography]]
* [[Terahertz tomography]]
* [[Tomography]]
* [[Confocal microscopy]]
* [[Medical imaging]]
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