Mobile Imaging #1 Flashcards
Who invented the first portable x-ray machine?
Frederick Jones
Who was a mechanical engineer who focused on coolant systems dealing with refrigeration?
Frederick Jones
Who was the first to use a portable x-ray?
The military in WW1; on the the field
Who used their own money to put portable x-ray machines in ambulances during WW1?
Marie Curie
Willhelm Conrad Roentgen invented what?
The first x-ray machine in Nov. 8, 1895
What technical controls are typically found on a mobile x-ray machine?
kVp and mAs
What is the typical range of milliampere-seconds (mAs) available on mobile x-ray machines?
mAs range is 0.04 to 320
What is the typical range of kilovolt peak (kVp) available on mobile x-ray machines?
kVp range is 40 to 130
What is the total power of units range from on a mobile x-ray machine?
Total power range is 15 to 25 kilowatts (kw)
Stationary radiography units can reach to?
150 kilowatts (kw)
Battery operated units contain what?
2 sets of batteries, 10 to 16, 12 volt batteries connected in a series
- One controls x-ray power output
- Other provides power for self-propelling driving
What is the average walking speed of a battery operated unit?
2.5 to 3 mph
Maximum incline is 7 degrees
When fully charged, can make 10 to 15 exposures and go 10 miles on level ground.
Takes 8 hrs to fully recharge
What are the advantages of Battery operated units?
Cordless and Constant kVp and mAS
Capacitor Discharge units do what?
Stores electrical energy and charges briefly before each exposure. Does NOT operate on batteries!
What are the disadvantages of Capacitor Discharge?
kVp drops constantly during exposure
Ex. kVp may start at 100 and drop to 80 after exposure.
What are the considerations of mobile x-rays?
Grid, Anode Heel Effect, SID
If a grid is tilted transversely, what is the result of that?
Image density is lost and/or grid cutoff
If a grid is tilted longitudinally, what is the result?
Image is distorted
If the CR is directed transversely from the mid-line of a grid by more than 1 to 1 1/2 inches, then grid cutoff will result. True of False?
True
Grid ratio is what?
6:1 or 8:1 with a focal range of 36 to 44 inches
Anode heel effect cause what?
A decrease of image density under the anode side of the tube. It is more defined with Short SID, Large field size, and small anode angle.
( Thicker part at cathode and thinner at anode)
What side of the tube has more intensity,
Cathode or Anode?
Cathode
Longer SID requires what?
An increase in mAs to compensate for distance, mA makes for longer exposure times
Mobile imaging produces some of the highest occupational radiation exposure for radiographers, True or False?
True, recommend distance is 6 feet
What is the single most effective means of radiation protection?
Distance, stand at a right angle to primary beam will have the least scatter radiation
SSD means?
Source to Skin Distance, cannot be less than 12 inches
Who removes a traction device?
Nurse or Physicians, x-ray techs should never remove a traction device
A true lateral decubitus (recumbent) position is with the coronal plane?
Vertical, with the patient elevated 2-3 inches
* Before exposure, patient needs to have been in position for at least 5mins, this is so air can rise and fluids can settle
Florida Hospital does not include chest/abdomen as 1 view, True or False?
True
Cathode placement does not apply to neonates, True or False?
True
Exam for C-spine on a mobile x-ray requires what?
Image from right to left at 40 SID only
For drainage secretion what are some precautions?
Wear gloves and place IR in a non-permeable cover (Rad Bag)
For a mobile chest exam, if the kVp is above 90 what should you use?
Grid
The infant does not need to be elevated for a dorsal decubitus position, True or False?
False
Straightening the head and neck of a neonatal infant may advance the endotracheal tube too far into the trachea, True or False?
True
