Tag Archives: dose

New DVD “Mastering the Art of Digital Radiography: Labs, Experiments and Explanations”

February 1, 2014 at 3:30 am , by Dennis Bowman

Blog 27 Over the past year I’ve thrown around the idea of videoing parts of my lectures and experiments I’ve created and turning it into a DVD. 2 months ago I got serious about it and wrote up almost 25 different “lessons”. I then rented the camera equipment from the

The 15% Rule and the Not So Famous Bowman’s 7 1/2% Rule

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September 1, 2013 at 6:34 pm , by Dennis Bowman

I believe the 15% rule was figured out in the mid 50’s. Of course this was back in the days of film/screen, but it still holds true today in the digital world. The “Rule” stated that if you increase any given technique by adding 15% more kV the following film

mAs = Dose

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July 1, 2013 at 8:40 am , by Dennis Bowman

Today’s post will center on how the mAs you use is directly proportional to the dose you are giving your patients. I could have just written “the dose the patient is getting” but I really want to make it clear that you the radiographer, or radiographer student, are the one setting

How Low Can You Go?

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June 15, 2013 at 5:59 pm , by Dennis Bowman

This is how I teach ALARA (As Low As Reasonably Achievable) to all of my students and whenever I give any kind of talk on digital radiography techniques to students or techs. It’s all about using the smallest/lowest mAs possible so that the dose is as low as it can

How Much Off-Focus Radiation Comes Out of the Tube?

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May 1, 2013 at 11:02 am , by Dennis Bowman

Today’s blog is about off-focus (stem) radiation which until a couple of weeks ago I had completely forgotten about. As a reminder to all of you who haven’t cracked open your physics books in a while; off-focus radiation are x-rays produced by stray electrons that interact at positions on the anode

Universal CR & DR Technique Charts

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April 15, 2013 at 7:28 pm , by Dennis Bowman

Back in the film days I would always give my students a technique chart that had about 50 different body parts on it. When we went digital in 2002, our vendor told to use the same techniques, so we continued to use those charts. Four years later we had learned

Off-Focus Radiation

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September 28, 2012 at 6:43 pm , by Dennis Bowman

This whole project began when we tried to prove if a patient should be shielded in the front or the back for a PA chest x-ray. I decided to test this out using an 8×10 CR cassette that I would run at 1200 speed, making it extremely sensitive to any

How much scatter is created from an AP chest x-ray?

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September 27, 2012 at 6:43 pm , by Dennis Bowman

Recently I attended a lecture where an educator’s student had held a CR cassette in front of his chest (he was wearing a full lead apron) while he made an exposure during a PCXR. Although he was a good 10 feet from the patient, the bones in his hand were