Sun 11 Oct 2009

Radiology Student Chat Zone :: Help understanding ionization chambers

Posted by heaven under Uncategorized
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Author: wvaio
Posted: Tue Oct 06, 2009 7:20 pm (GMT -4)
Topic Replies: 6

Ahh... I can explain this one for you!


Layman's version:

Directly behind the grid on the wall bucky there are three chambers. They basically count the number of photons that are going to hit the cassette. When a determined number of photons (enough to produce a certain density on the image) are produced they tell the machine to stop. If they don't count enough x-rays before the back-up timer goes off, the timer terminates the exposure. The chambers will count any type of photons including scatter. That's why it is necessary to collimate and place the part over the correct cells. You mainly want them to count the photons in the area of interest. If they read too many photons from unnecessary exposure, you can end up with quantum mottle. The chambers do not care what kVp you use. They only care about ionizations produced by photons.

Hope that helps.
Wvaio
_________________
“Whether you think that you can, or that you can't, you are usually right.” --- Henry Ford
 

Sun 11 Oct 2009

Radiology Student Chat Zone :: Best student training techniques for trainers

Posted by heaven under Uncategorized
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Author: wvaio
Posted: Tue Oct 06, 2009 7:05 pm (GMT -4)

Topic Replies: 5

I appreciate the input!

I will NEVER lose my sense of humor. Smile

Funny that you mention that. Quick story:
Today was day one for a new batch of students. Their very first day of clinicals. I'm not great with introductions, so to introduce myself I decided to have some fun. I sent them on a mission to IVR to bring back the film stretcher! We were fresh out of 14x17 film in the digital printer, therefore it was necessary to get the film stretcher to stretch a few 10x12's into freshly squeezed 14x17's. Smile I taped a sign onto an old utility cart that firmly stated " for film stretcher transport only!!" That cart squeaked like crazy. It was so hard to keep a straight face as they walked, as a team, down the hall, with that old raggedy cart that sounded like a one man band! They were none too impressed when they returned. When they returned I took them into an empty room and introduced myself formally. Gave them my top 10 keys to success in clinicals. Then I let them ask any questions in the world that they had on their mind.Later on in the day, I gave them a 45 minute lesson on how to shoot a chest X-ray. As they left, at the end of the day, they each told me that they looked forward to learning from me. Best day I have had in a long while.

Anyone else out there sent the students to grab the fallopian tubes out of the store room? I would love to hear some stories, if any would share.

Good day to all!

Wvaio
_________________
“Whether you think that you can, or that you can't, you are usually right.” --- Henry Ford
 

Sun 11 Oct 2009

Radiology Student Chat Zone :: Best student training techniques for trainers

Posted by heaven under Uncategorized
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Author: traineetech
Posted: Tue Oct 06, 2009 1:00 pm (GMT -4)
Topic Replies: 5

hjhogle wrote:
This is a beginner's positioning tool, only. When used, you are focusing on the shadow of light bulb, not on knowing the underlying anatomy.

hjh, RT


True, hjh, but thought I'd post it here, because unless the student positions correctly as per the image, then nine times out of ten, the apices will not be displayed in the resulting image.

wvaio asked if any students had any learning experiences to share, and that was mine. Make sure your students understand the importance of positioning, and how incorrect positioning will normally lead to a nondiagnostic image requiring repeats.
 

Sun 11 Oct 2009

Radiology Student Chat Zone :: Best student training techniques for trainers

Posted by heaven under Uncategorized
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Author: hjhogle
Posted: Tue Oct 06, 2009 12:42 pm (GMT -4)
Topic Replies: 5

One of the best things I've learned is to keep in mind that every student in your class or group is not the same. Some are visual learners, some physical. Their motivations are different and some will be suprisingly needy.

My knee-jerk reaction was to believe that the needier learners would not make good radiographers - while that was generally true (they were simply not as mature as the others), one of my favorite successes was a student who lived in my pocket for two years who now teaches in a program in another state.

And - NEVER NEVER lose your sense of humor!
hjh, RT
 

Sun 11 Oct 2009

Radiology Student Chat Zone :: Best student training techniques for trainers

Posted by heaven under Uncategorized
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Author: hjhogle
Posted: Tue Oct 06, 2009 12:37 pm (GMT -4)
Topic Replies: 5

This is a beginner's positioning tool, only. When used, you are focusing on the shadow of light bulb, not on knowing the underlying anatomy.

hjh, RT
 

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