There are only 5 reasons why a radiographer would change a technique (and 8 ways you could do it without using distance). As the how’s are not nearly as interesting as the whys, we’ll start with why you would change a given technique. Here are the 5 reasons: Increase kV,
Chest x-rays are the first exam that most students learn in school. This is because approximately 33% of all the exams performed in the average facility or hospital are chest x-rays. And what was the one thing you were supposed to do with everyone’s shoulders? Roll em’ forward of course.
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
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