Talk:Optical coherence tomography

message: 08-29-06: Any chance of someone in the know adding a layperson definition or brief explanation?  I'm editing a consent form for a research study that will use OCT for an investigational purpose.  Federal regulations (45 CFR 46.116) require that the information given to a research subject be in language understandable to the subject.  Unless the OCT researcher decides to confine recruitment to MIT grad students (unlikely to have the disease in question!), that regulation is going to be pretty hard to meet.
Growmac (talk) 15:28, 30 January 2008 (UTC)
thread_title: Comment

message: There was no link to the following footnote in the article, so I have saved it here:
:9.     J. M. Herrmann, M. E. Brezinski, B. E. Bouma, S. A. Boppart, C. Pitris, J. F. Southern and J. G. Fujimoto, "Two- and three-dimensional high-resolution imaging of the human oviduct with optical coherence tomography," Fertility and Sterility, vol. 70, no. 1, pp. 155--158, 1998. Available: sciencedirect.com.
-AED 07:01, 21 November 2006 (UTC)
thread_title: Reference

message: This article appears confusing to me. Does anybody else have trouble understanding it?
The DarkArcher was here (talk) 01:14, 14 September 2008 (UTC)
replies: text: No, I find the article good, but the topic is complex. --Kipmaster (talk) 15:42, 10 May 2011 (UTC)
thread_title:  Confusing 

message: Hi. I notice in the "laymans description" a claim that light taht is scattered loses its coherence. I have access to several scientific articles that show this is not the case. I would like to know if someone is willing to back up the claim in question with a source, or if I should change it and source my change. Cuardin (talk) 09:39, 29 March 2010 (UTC)
thread_title:  Dubious: Light losing its coherence when being scattered 

message: Example of what i mean: "In time domain OCT the pathlength of the reference arm is translated longitudinally in time"
Which, of course, is technically correct. But in no way does it help understanding what time-domain-OCT is about.
I get that medical professionals want to, well, sound professional, but wordings like that are just douchebaggery. Just say what you want to say, something like "reference arm moves from left to right and back repeatedly." doesn't sound fancy, but everyone will instantly know what it means.  — Preceding unsigned comment added by 93.196.90.54 (talk) 13:06, 12 August 2015 (UTC)
replies: text: Yes we had an expert come through and do a lot of work, which was great, but it was too technical, per WP:TECHNICAL.... Jytdog (talk) 14:00, 12 August 2015 (UTC)
thread_title:  Wording is too elitist 

message: Hello,
I noticed that each of the four figures in the Theory section is for a different type of OCT (well, two are "SD-OCT", one is TD-OCT, and another is SS-OCT).  Since these come before the descriptions of each separate technique (TD, spatially-encoded fourier-domain aka. SD, time-encoded fourier-domain aka. SS), these figures are rather confusing, since a different explanation is needed to understand each technique.
If, instead, the figures are moved into their respective technique heading, they might make a lot more sense.  
Also, it would be helpful if the figures included the name of the technique (eg. the 1st figure sounds like the technique is called "full-field OCT", but the OCT technique appears to correspond to "spatially encoded fourier-domain OCT", although it is admittedly acquiring a full-field view).
Thanks for the article.
DeminJanu (talk) 20:38, 24 August 2016 (UTC)
thread_title:  Theory: Figures are for different techniques 

message: The origin of the technology lay with MIT scientists, who (it is said) applied an application from outer space research after a project was canceled. The layers of imaging that the light has to pass through are the same layers in principle that light passes through cloud that were pursued for military purposes. Reference Fujimoto, J., & Swanson, E. (2016). The Development, Commercialization, and Impact of Optical Coherence Tomography. Investigative Ophthalmology & Visual Science, 57(9), OCT1–OCT13. http://doi.org/10.1167/iovs.16-19963, makes mention of initial support from Air Force Office of Scientific Research (Arlington, VA, USA)Fred114 21:44, 26 September 2018 (UTC)
thread_title:  Origin 

message: There's a problem with the description of the light sources having low coherence.  Ultra-broadband laser sources can be used for OCT because they can produce very short pulses.  These pulses create an interference pattern only within a very short distance (given by ~ "speed of light"/bandwidth).  If the laser is phase-stabilized, then one pulse can create a stable shot-to-shot interference pattern with the next if they can be set up to overlap each other.  In this case, the coherence is typically very high, and the coherence time is determined by the bandwidth of any particular cavity mode, not the entire bandwidth of the laser.  
This interference, which possible in principle, is unlikely in practice as the distance between pulses is given by "speed of light"/"repetition frequency", which for an 80MHz source gives a distance of about 4 metres.  However, to insinuate that these lasers have a low degree of coherence is misleading.
2607:FEA8:F1E0:725:D5B3:1C10:16E7:7F7C (talk) 22:12, 30 November 2019 (UTC)
thread_title:  Coherence 

message: Comment "verification needed|reason=confocal microscopy typically has a resolution of about 1 um and it is stated earlier that confocal microscopy has better resolution than OCT, so need to substantiate this claim|date=June 2015" removed. Confocal microscopy has a resolution limit described by the Rayleigh criterion amounting to ~250 nm 131.181.27.227 (talk) 01:05, 16 August 2022 (UTC)
thread_title: Resolution

message: "Due to the coherence gating effect of OCT the complex degree of coherence is represented as a Gaussian function expressed as" cites a paper, which does not appear to have the given equation in it. Ionsme2 (talk) 22:29, 30 March 2023 (UTC)
thread_title:  Equation of Complex Coherence citation