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Radiology Students: Shades of Gray

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Hi there! [Jul. 22nd, 2008|01:12 pm]
Radiology Students: Shades of Gray


So I'm poking around in different places and should have looked into this community earlier!

I'd thought I'd stop by and say hi, introduce myself, and maybe ask some questions if anyone in this community is still active.

I've been a LJ poster for a few years now but only started a 2 year Rad tech program in the spring. I'm currently in the middle of my 2nd semester, and hoping (and praying) I don't keel over!

I have a nice physics questions for all you pros and survivors of the program.

Thanks <3

[User Picture]From: dshivan
2008-07-24 03:55 am (UTC)
Thanks for the responses!

Here's a few questions... and just fyi, I'm taking part 2 of Procedures and the second Physics class, using the Merrill's and Bushong's text.

At the moment, we're being bombarded with lots of equations, and we were finally introduced the Density Maintenance Formula (not in Bushong's):

new mAs = old mAs x (new distance^2 / old distance ^2) x (new grid / old grid) x (old kVp factor / new kVp factor) x (old film speed / new film speed)

(sorry I know the formatting isn't that great on here, so I tried too use parantheses with them)

But with relation to kVp factor, what if your base value and the 2nd kVp value is greater than 30%? Does the kVp value get thrown out the door where the 15% rule doesn't apply?

Also, I've noticed that this formula seems to be the base of most of the formulas we've had to learn (like the Inverse square law). I'm assuming this is the best thing to learn and then covering up certain parts for information that the problems don't give you.


And... for procedures:

What's the best way to find the CR for the L5-S1 projection? My professor and classmates are making a L with their left hand and palpating the iliac rest/ASIS area, but I wasn't sure exactly what I was looking for and where exactly do I need to direct the CR at.

What's the best way to memorize/understand Oblique C-spines and Ribs in what someone is looking for? (ex. You are taking a PA exposure while focusing on the left posterior side of ribs, so you take a RAO lower ribs). I tend to get those confused, especially when looking at images.

And is there a site where there are images for us to look through and identify? I would think that would help us with the imaging portion of our lecture tests.

Thanks again for your earlier responses and answers!
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[User Picture]From: bobandweave
2008-07-28 01:46 pm (UTC)
ok i am an RT(R) and after you take the exam you forget alllllllllll those calculations and stuff, but i can help you w/ the 2nd question!!!

for the spot image what i like to do is w/ the pt. facing away from me i take my left hand and rest it on their crest and w/ my right hand palpate their ASIS. then w/ my 2 hands there i touch my thumbs together and i am usually spot on about 94% of the time. also i am using 8x10's...i know some techs who use 10x12's!!

omg the rib thing...i have always hated ribs! i mean there really is no magical way to memorize that stuff. you just have to remember that if you're shooting an AP obl. c-spine w/ their LEFT side against the bucky then you're going to see the RIGHT open intervetebra foramina...but if you're shooting PA then everything changes...the side down is the side that's gonna be open!!!

good luck w/ everything! you'll make it!!!!!!!!!!!!
(Reply) (Parent) (Thread)
[User Picture]From: bobandweave
2008-07-28 01:47 pm (UTC)
sorry i didn't mention that where my 2 thumbs meet is where i direct the CR.
(Reply) (Parent) (Thread)
[User Picture]From: dshivan
2008-07-28 03:43 pm (UTC)
Thanks for replying!

Yea we're using 8x10's, collimating 5"x5" (our prof is anal). So far, so good! 2 inches posterior to ASIS and 1 1/2" inferior to the iliac crest! Ok test in 2 hrs!

Edited at 2008-07-28 03:43 pm (UTC)
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