Talk:Tomography/Archive 1

Archive 1

Why is ultrasound discussed on this page?

Ultrasound uses time-of-flight to spatially encode signal. The mathematical definition of tomography includes the taking of projections and then reconstructing from radial Fourier space/back-projecting. While MRI is a less "classic" example of tomography compared to e.g. CT, it can still be considered tomographic, but ultrasound is simply a related medical imaging modality.

Ultrasound should only be mentioned here in the context that it's NOT a tomographic method. — Preceding unsigned comment added by 2602:304:AB31:15D9:DDAD:7461:F3F9:98E5 (talk) 19:08, 6 June 2014 (UTC)

I'm afraid that's just not true. I work in the area of acoustic instrumentation and flow profile analysis by ultrasound tomography is one of the areas we're looking into.

Tomography can be done with any penetrating wave, and "ultrasound" refers to any acoustic signal above what's nominally considered the range of human hearing. Ultrasound can be used for medical imaging, but that's not all it means. The word covers any application of high frequency acoustic waves, including tomography. It's a penetrating wave just like the others listed. InelegantSolution (talk) 12:28, 30 April 2015 (UTC)

Uncomputed tomography

I came to the entry on "Tomography" looking for information of UT or uncomputed tomography ... which I found is known in the medical field as "plain tomography" ... I found an article at http://www.rhhct.org.uk/history.html that mentions plain tomograpy.

It appears to have been almost completely superceded by computed tomography (CT), but I think that the "tomography" entry should have mention of it as it is still used in my industry, aerospace.

A cross reference on http://en.wikipedia.org/wiki/UT should also be added for those looking for this and using the term "UT", as I did.

--Mattrix007 19:42, 3 January 2007 (UTC)

Hmm... http://en.wikipedia.org/wiki/Nondestructive_testing lists Ultrasonic testing as "UT" ... I must be wrong about how the term UT is used in aerospace! Shows how well I know my industry!

Still, for historical purposes, I guess a bit on plain tomography might be good.

--Mattrix007 19:48, 3 January 2007 (UTC)

You seem to be looking for Focal plane tomography. "Plain tomography" and "Conventional tomography" are very unspecific terms. Mikael Häggström (talk) 12:38, 23 April 2017 (UTC)

How does it work?

I don't see any explanation of the process of converting a signal to an image. I have seen tomography performed to reconstruct radar images of objects, as an alternative to inverse synthetic aperture radar imaging. I'd like to know how that would work. This article seems focused on medical applications rather than the underlying process itself. ~Amatulić (talk) 19:05, 30 October 2008 (UTC)

Unnecesary. If the EM beam was visible light and the sensor was a photocell, you wouldn't have to explain how a photocell works.

Verdana♥Bold 06:56, 21 May 2016 (UTC)

Operation depends on tomography type. For example, there's Operation of computed tomography and [[Physics of magnetic resonance imaging. Mikael Häggström (talk) 12:39, 23 April 2017 (UTC)

CNN interviews

I hear that CNN did interviews during the election via tomographic projections of their subjects, although they called them "holograms". Someone who knows more about it than me should include this in the article. --Arctic Gnome (talk • contribs) 05:10, 6 November 2008 (UTC)

Planography

I added a reference about planography, which seems to be a synonym for tomography. If I am wrong, please make whatever repairs are necesssary. Eastmain (talk • contribs) 08:04, 11 July 2011 (UTC)

Why does "polytomography" redirect here?

Not mentioned in article. 86.179.191.90 (talk) 01:11, 8 February 2015 (UTC)

Spelling correction

I've amended two instances of "principal" (the most prominent, eg. Principal Engineer, School Principal) where "principle" (the way it works) looks to have been intended.InelegantSolution (talk) 12:12, 30 April 2015 (UTC)

Ooo, good catch! I would have missed that.

Verdana♥Bold 06:39, 21 May 2016 (UTC)

Inscrutable rotating 3D animation

Does anyone have a better animation of a tomogram? The present one is supposed to be a fingertip, but I can't identify any features (like fingernail or bone). For that matter, I can't tell if the finger is horizontal or vertical. I have an excellent one (of an entire mouse), but I don't remember where I found it, so we can't use it. 2 bad, 2.

Verdana♥Bold 06:50, 21 May 2016 (UTC)

The fingertip is not a tomography, but a 3D generate image by it. I moved it to its proper section. Mikael Häggström (talk) 12:40, 23 April 2017 (UTC)