Chapter 15 - Trauma Flashcards
(26 cards)
battery driven, battery operated x-ray units have how many and what kind of batteries?
10 to 16 rechargeable, sealed, lead acid - type 12 volt batteries connected in series.
what is the average speed of the portable x-ray machine?
2.5 to 3 mph with a maximum incline of 7 degree and have a full driving range of up to 10 miles on a level surface after a full charge.
on a portable x-ray unit, what is the dead mans control?
the parking brakes are automatically engaged when the control levers are not in use.
what is the charge time for a full charged portable x-ray unit?
8 hours
what are the two types of mobile x-ray systems?
battery driven, battery operated & standard power source, capacitor discharge non-motor-driven units
where should the intensifier be placed?
on the top. if it is on the bottom, there is an increase of OID which decreases image resolution and increases scatter radiation.
the tube on top results in what to the radiologist and technologist?
a significant increase in exposure to the eyes, head, and neck.
PACS means?
picture archiving and communications system
cine loop is what?
images are recorded in rapid succession while contrast medium is injected and then displayed as a moving image.
where are the control panel of the c-arm located?
on the TV monitor control cart, on the c-arm unit itself, or on an attached or detached remote control
what is the pulse mode for?
used to create an x-ray beam that pulsates at timed increments to reduce exposure.
what is the snapshot or digital spot mode?
it activates a digital spot, which results in a higher quality computer-enhanced image as compared with a held fluoro image.
what is subtraction in fluoro?
a technique in which an initial image is recorded during continuous fluoroscopy. the initial image is then used as a filter removing all stationary structures.
what is roadmapping?
a specific fluoroimage is held on the screen in combination with continuous fluro. it is similar to subtraction in that it removes stationary structures.
the c-arm should be in what kind of position?
vertical posteroanterior projection
what happens if you increase the angle of the c-arm 30 degree?
you increase the dose to the face and the neck regions of the operator standing next to the c-arm by a factor of four.
a horizontal projection increases or decreases on the tube side of the patient?
increases
vertical AP projection of the c-arm is not recommended. Why?
there is a significant increase in exposure to the operator. up to 100 times higher close to the eyes of the operator.
what amount of distance should the portable operator be before taking an exposure?
a minimum of 6 feet
what is another name for the image intensifier.
flat panel detector
in a fluoroscopic procedure, the lead apron should be how thick?
0.5mm
a 0.5mm lead apron reduces the exposure by a factor of?
50 or more.
what is the primary difference in positioning for trauma patients?
adaptation
what are the three principles of radiology that should be remembered when performing trauma.
1) two projections 90degree, 2) include entire structure, 3) maintain safety.
