Comments for The Sterile Eye

Comment on After the Curtain by Øystein

Øystein — Mon, 06 Feb 2012 12:00:41 +0000

A link to a larger version on Flickr have now been added. Click on the photo to open.

Comment on How To NOT Use a Medical Photo by How To NOT Use a Medical Photo: Best example « ScienceRoll

How To NOT Use a Medical Photo: Best example « ScienceRoll — Thu, 02 Feb 2012 20:35:53 +0000

[...] The Sterile Eye blog came up with a very tough case in which the official poster for the the 19th Workshop of the International Society for the Study of Vascular Anomalies (ISSVA) was found to be quite disturbing and Øystein Horgmo raised important questions about the use of this image. [...]

Comment on How To NOT Use a Medical Photo by Øystein

Øystein — Wed, 01 Feb 2012 17:27:40 +0000

Juan,

You are absolutely right.

In my experience permissions to use or take photos for external use other than strictly medical are often made offhand at the end of a conversation. Patients don’t want to be difficult and say yes to their treating doctor, often also without knowing the specifics of what they have agreed to.

Permissions should be written, well-informed, revocable and the question should be posed by a person who is, as you say, not in a situation of advantage.

Comment on How To NOT Use a Medical Photo by Juan Pablo Domecq

Juan Pablo Domecq — Wed, 01 Feb 2012 15:41:22 +0000

Another important question, at least as important than the previous ones, is:
At the time of the consent, Were ISSVA members in a situation of advantage over the parents, forcing (wittingly or unwittingly) their decision?
This questions should be make before any other one.

Comment on How To NOT Use a Medical Photo by Øystein

Øystein — Tue, 31 Jan 2012 13:08:43 +0000

Michael,

The questions were also sent to ISSVA and their answers will be published here when/if I receive them.

Comment on How To NOT Use a Medical Photo by Michael

Michael — Tue, 31 Jan 2012 12:53:42 +0000

Those are all very good questions. Did you bother to find out the answers before you published this?

Comment on The Apollo 11 Hasselblad Cameras by cesarakg

cesarakg — Wed, 25 Jan 2012 21:51:50 +0000

Some articles about heat transfer, surface temperature, and how Hasselblad made the cameras so it wont melt nor froze the film on the moon:

Heat Tranfer: http://www.clavius.org/heatxfer.html
Temperature on the moon (and another PhD bites the dust): http://www.clavius.org/envheat.html
Surface temperature and insulation: http://workingonthemoon.com/WOTM-ThermalEnvrnmnt.html

I hope it helps.

Comment on Unusual Robotic Surgical Skills by Øystein

Øystein — Wed, 25 Jan 2012 08:43:12 +0000

…and will it start acting like Bender?

Comment on Unusual Robotic Surgical Skills by robertpeinert

robertpeinert — Wed, 25 Jan 2012 03:12:45 +0000

I love the various – un-medical related – things they are doing with the DaVinci. While many say it may be pointless, I think it shows off the high capabilities of the robot, as well as the many possibilities for future uses.

But, will it blend…

Comment on The Apollo 11 Hasselblad Cameras by cesarakg

cesarakg — Mon, 23 Jan 2012 23:40:08 +0000

Bad news for you, mr. Ph. D. in Molecular Science, your experiment doesn’t represent the Moon – there’s no atmosphere on the Moon. So, when they talk about temperature on the Moon, they are talking about temperature of what? Tip: it’s the surface. That thing under the feet of the astronauts, full of regolith, where the cameras never touched.

One more thing, mister “Ph. D.”, in the spaceship the temperature was… dunno, well, supose it was 20 degrees Celsius. The moment Aldrin or Armstrong goes out of the ship, does the temperature drops instantly to -173 degrees Celsius? I think not. The moment the camera gets to get illuminated by sunlight, the temperature rises instantly to +116 degrees Celsius? Again, I think not.

Tell me, mr. Ph. D. in Molecular Science, if the camera is in shadow, on the Moon, how fast the temperature will drop, if the initial temperature is 20 degrees Celsius (consider the camera a black body)? And if it is under the Sun (~60 Watts/m², albedo of the camera is very high, ~1 – you know what is it and what it means here, right?), again on the Moon (no atmosphere) how fast the temperature will rise?

If you put the camera in a freezer, that’s another matter: the camera will be in contact with the air (you know, tiny molecules of oxygen, water, carbon dioxid, nitrogen – a said molecules? That’s your field of expertise!) in the freezer, at, say, -5 degrees Celsius – heat transfer is a lot faster than if the interior of the freezer was an almost perfect vacuum, as on the Moon. The same with the oven, “mutatis mutandis”.

Finally, considering the low albedo of the Moon, and the low angle of the Sun, and the few hours that the Apollo 11 was on the Moon, what was the temperature of the surface when they landed and when they returned to Earth?

-oOo-

Sorry about the bad english. I’m only an electrical engineer. The serious calculations I left as an exercise for the Ph. D. in Molecular Science. The formulae you can find in Halliday and Resnick, “Physics”. Good luck.