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Comment Re:X-Ray Film stock versus Digital Imager (Score 1) 138

Film vs digital detector doses are comparable, but when you factor in repeats due to improper exposures, film is a little higher. It's not enough to make it worth switching to digital detectors based on dose considerations alone though. There are plenty more compelling reasons to switch from film to digital.

The wider dynamic range of digital detectors gives a lot of flexibility when it comes to the amount of exposure used. If not enough radiation is used, a digital detector will produce a noisier, but often still useful image. The film image on the other hand will be too light and generally non-diagnostic. If too much radiation is used, the digital detector will produce a pretty, low noise image where the film image will end up being too dark and often non-diagnostic.

Comment the need for proper imaging protocols (Score 1) 138

It is ultimately the responsibility of the imaging professionals (radiologists, technologists and medical physicists) to develop proper imaging protocols to suit the age and sizes of the patients being imaged, not only from a radiation dosimetry point of view, but also an image quality point of view.

For a long time now the tendency, particularly with CT imaging, has been to use a one size fits all protocol for everybody.

The move to reducing medical radiation exposure has been going on for several years now. Recent high profile incidents (such as what happened with CT patients getting CT angiograms at Cedars Sinai) prompted many institutions to review their imaging protocols. The Image Gently campaign has worked towards getting institutions to develop pediatric specific imaging protocols for several years now. For procedures involving potentially high radiation exposures, radiologists review and protocol the requests to make sure the requested exam fits the clinical indications. Outpatient imaging centers performing CT imaging need to get their scanners accredited in order to get Medicare reimbursement. Accreditation by the ACR (American College of Radiology) places dose limits on several types of scans. If a site's protocol results in a radiation dose that exceeds the limits, they fail accreditation and need to adjust their protocols.

The FDA can and should require manufacturers provide the tools to enable imaging facilities to monitor and record the amount of radiation given during a procedure, but it needs to be the responsibility of the users to make sure the imaging equipment is used properly on patients.

Comment the best camera (Score 5, Insightful) 569

is the one that you carry with you.

for a photography newbie, i'm of the opinion that the specific camera doesn't really matter. They're all more or less the same anyway. what's most important is finding one that you'll want to carry around with you and use. the more you use it the less newb you'll become over time. you'll learn things and by the time you're ready to upgrade you'll know what to look for.

Comment Saw it last night (Score 1) 239

and rather enjoyed it. The ending was different from what I expected or thought it might be, but given the nature of apes, a much more fitting ending than the one I imagined.

the only people the apes kill are the ones that deserved it. on the other side, lots of apes were killed by people.

Comment Re:You've taken the idea and got it backwards (Score 1) 199

This has been known for decades. The more time at altitude the LESS you should be exposed to other forms of radiation. That's why they ask you questions about flying before any medical procedure involving radiation.
I'll bet the pilots are incredibly pissed about all these scans because for one thing it can reduce their legal flight time.

In the US, medical exposures are not counted against occupational exposure.

To make things worse these things are not just your normal transmission x-ray where you just want to see what photons make it to the sensor and the dark spots tell you where the dense stuff is. What these scanners are doing is providing far more radiation with the aim of getting atoms to absorb and re-emit photons - effectively making you radioactive while the scanner is on. The idea behind that is the wavelengths of the re-emitted photons can be used to determine what elements are present, find metal and perhaps find explosives. Because that really adds up to a shitload of radiation if it's going to scan all the way through you the dose is cut back and you just end up with the skin being exposed to quite a lot and no ability to sense internally hidden explosives.

No. The x-rays being detected are those that scatter off the person being scanned. They are *not* making anybody radioactive in any way. There is no way scattered x-rays are going to tell you the elemental composition of anything. Density, but not composition.

It is also not a "shitload of radiation". If these machines were detecting transmitted radiation instead, that would actually require *more* radiation exposure and would operate more like x-ray units found in hospitals.

Submission + - Six Atari 2600 "vaporware" games from 1983 found! (digitpress.com)

Anonymous Coward writes: "Six previously unreleased Atari VCS/2600 games that were developed by Jerry Lawson’s company, Video Soft, are at last being released! The games were mentioned in press releases from the early 1980s and were long thought to have been just one of the many vaporware titles that never materialized. Not only do they exist in prototype form, but all were far enough along in development to be playable, with half of them considered to be complete!

Thanks to Jerry Lawson and the efforts of a few, dedicated Atari fans, the prototypes were archived, new artwork was created, and cartridges were produced. Each includes both a box and manual, and production is limited to 100 numbered copies of each title. Only 100 of each will ever be produced. This is the single-largest cache of unreleased Atari VCS/2600 prototypes to ever be released at one time!"


Submission + - Tech Expertise Not Important in Google Managers 1

Hugh Pickens writes writes: "For much of its 13-year history, Google has taken a pretty simple approach to management: Leave people alone but if employees become stuck, they should ask their bosses, whose deep technical expertise propelled them into management in the first place. Now the NY Times reports that statisticians at Google looking for characteristics that define good managers have gathered more than 10,000 observations about managers — across more than 100 variables, from various performance reviews, feedback surveys and other reports and found that technical expertise ranks dead last among Google’s eight most important characteristics of good managers (reg. may be required). What Google employees value most are even-keeled bosses who made time for one-on-one meetings, who helped people puzzle through problems by asking questions, not dictating answers, and who took an interest in employees’ lives and careers. “In the Google context, we’d always believed that to be a manager, particularly on the engineering side, you need to be as deep or deeper a technical expert than the people who work for you,” says Laszlo Bock, Google’s vice president for “people operations,” which is Googlespeak for human resources. “It turns out that that’s absolutely the least important thing. It’s important, but pales in comparison. Much more important is just making that connection and being accessible.”"

Comment extract every bit out of my stuff (Score 1) 507

I tend to hang onto all of my stuff until it breaks beyond repair or is no longer functional for me. I hung on to my Dell Dimension 8100 and kept it going with upgrades and replacements for almost 10 years. It's still usable, but I needed more computing power for number crunching so I got a new computer.

I used my Tungsten T3 for 4 years until it accidentally got washed in the laundry. Replaced it with another one and still using it 3 years later.

still watch tv on a 10 year old 23" CRT

Comment Between classes (Score 1) 236

I was switching between classes when I heard a friend of mine say the shuttle just blew up. I thought he was just bull-shitting and went on with my day. Then I got home from school and saw all the news coverage. It was a sad day after that.

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