Lecture 8; Mobile Radiography Flashcards
What does PACU stand for?
Post-Anesthetic Care Unit or RR
What does CCU stand for?
Coronary Care Unit
What are the special care units in the hospital?
Special Care Units: ICU, NICU, PACU (Post-Anesthetic Care Unit or RR), CCU (Coronary Care Unit)
Read over the list of places where MRTs are present:
Emergency Department
Special Care Units: ICU, NICU, PACU (Post-Anesthetic Care Unit or RR), CCU (Coronary Care Unit)
Patient Rooms
OR - Surgical Suites
Surgical Day Care Units
Morgue
What type of mobile equipment is this?
Portable X-Ray (CR)
What type of mobile equipment is this?
Carestream-Portable machine
T/F
DR portables changes certain protocols.
True
What type of imaging has the highest occupational exposures for MRTs
Mobile radiography
What is the minimum distance from the patient for mobile imaging?
3 meters at 90 degrees
T/F
Lead is not required with mobile radiography.
False; lead is requried
Even though it may be different when we get into placement
T/F
When doing mobile imaging, you should position yourself perpendicular to the central ray
True
Who is responsible if the surgeon is not wearing lead?
The MRT
What are the technical considerations when it comes to mobile imaging?
- SID
- Grid
- Patient Condition (fluid vs. air, cast)
What are APRs?
Preset anatomic programs
What are the two technical factors that you can adjust in mobile radigraphy besides the SID?
kVp and mAs only
There is no reciprocity with mobile equipment
TRUE!!!!!!
How do you decrease motion in mobile radiography?
Increase your kVp by 20 and decrease you mAs by half
What is the minimum source to patient distance in mobile radiography?
-Minimum source to patient distance is 30 cm
If you increase your SID from 40”-72”, how much do you need to increase the exposure?
3.24 times more exposure
Inverse Square Law
72 divided by 40 squared
If you increased your SID from 50”-72”, how much would you need to increase your exposure?
2.07 times more exposure
What are the 3 benefits of larger SIDs?
- Less beam divergence-less anatomy cut off
- Increased SR
- Less dose to the patient
What are the 3 benefits of smaller SIDs?
- Less wear on the tube
- Can use it to our advantage for beam divergence
- Shorter exposure times….less motion
If you were to pick a grid for a portable, what would you pick?
6:1 Parallel grid
When should you use a grid?
When the anatomy is > 10cm (used when greater than 10)
T/F
The grid must be perpendicular and centered to the Central Ray
True
Off-centering of how much will produce cut off on a focused grid?
2.5 cm will produce grid cut-off on a focused grid
What are the benefits of virtual grids?
1.Significant weight reduction
2.Reduces grid misalignment issues
3.Potential for dose reductions (if we are not worrying about being misaligned)
If a patient has a Fiberglass cast, how much of an increase needs to be made to exposure?
25% to 30% (or on average 3-4 kVp)
If a patient has a Plaster cast, how much of an increase needs to be made to exposure?
Medium – 50% (go up 5 kVp)
Large plaster – 100% (go up10 kVp)
If plaster is wet, what changes need to be made to exposure?
You need to go up another step in mAs
What would be the technique for a large, wet plaster cast? Original technique is 60 kVp at 2 mAs. What technique are we using?
70 at 2.5 mAs
What are the steps of mAs starting from 1?
1, 1.25, 1.6, 2, 2.5, 3.2, 4, 5, 6.4
When should you wash your hands?
- When hands are soiled
- After coming in contact with blood or body fluids
- Before beginning invasive procedures
When should hand sanitizer be used?
To be used when hands do not appear to be soiled