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Exam 5
Chapter 8: Radiographic and Flouroscopic Equipment
49
Health Care
Undergraduate 1
07/10/2011

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Term
x-ray tube
Definition
responsible for producing x-rays and heat
Term
diagnostic efficacy
Definition
accuracy with which a test reveals the patient's medical condition
Term
diagnostic yield
Definition
how much clincally useful information the test provided
Term
what are the components of an x-ray/radiographic system?
Definition
1. x-ray tube & support system
2. collimator assembly
3. x-ray table
4. x-ray generator
5. control console
6. image receptor holder device
Term
the image receptor may be a conventional film-screen cassette or more commonly a _______________ _____________
Definition
digital receptor
Term
what is the x-ray tube made of?
Definition
Pyrex glass
Term
what are the primary components of a x-ray tube?
Definition
anode and cathode
Term
anode
Definition
positive electrode of the x-ray tube
Term
cathode
Definition
negative electrode of the x-ray tube
Term
what supports the x-ray tube and allows you to position the x-ray tube over and around the patient?
Definition
tube stand
Term
what type of energy is supplied to the x-ray tube through the two large cables?
Definition
electrical
Term
the x-ray tube converts electrical energy into
Definition
x-rays and heat
Term
how can you control the number and energy of the x-rays produced by the x-ray tube?
Definition
by adjusting the control console
Term
what is directly below the x-ray tube?
Definition
collimator
Term
what is the x-ray beam limiting device in the x-ray/radiographic system?
Definition
collimator
Term
what is responsible for the x-ray field size?
Definition
collimator
Term
coning down
Definition
increasing collimation=decreasing x-ray field size
Term
where is a high intensity light bulb found?
Definition
collimator
Term
when a light is projected on the patient what does this indicate?
Definition
x-ray exposure area
Term
PBL
Definition
positive beam limitation: automatically collimates x-ray field size to minimize patient exposure
Term
why is it wrong to have an image receptor that is 10 x 12 and a collimation of 12 x 12?
Definition
you are over-exposing the patient
Term
what is the only reason to expose a patient to radiation?
Definition
to obtain a useable image
Term
what the most obvious part of a x-ray/radiographic system?
Definition
x-ray table
Term
what are the 3 characteristics of an x-ray table?
Definition
1. tilt
a. tilting
b. nontilting
2. height
a. adjustable
b. nonadjustable
3. movement
a. stationary
b. free-floating
Term
explain a:
a. 90-90 table
b. 90-30 table
c. 90-45 table
Definition
a. 90-90 table: vertical to horizontal in either direction
b. 90-30: 90 in one direction and 30 in another
c. 90-45: 90 in one direction and 45 in another
Term
radiolucent
Definition
easily transmits x-ray energy with very little absorption
Term
TRUE or FALSE?
x-ray tables are NOT radioluscent
Definition
false; they are
Term
Bucky mechanism
Definition
located below the table top and holds the x-ray cassette (image receptor) stationary during x-ray exposure
Term
x-ray cassette
Definition
image receptor
Term
the Bucky mechanism tries to keep the image receptor centered on the __________ ___________
Definition
x-ray tube
Term
what is the workhorse of the total system?
Definition
x-ray generator
Term
what are the 2 main components of the x-ray generator?
Definition
electrical cabinet and operator console
Term
the power of an x-ray system is expressed in
Definition
kilowatts
Term
the control console allow you to
Definition
1. turn the x-ray system on and off
2. select x-ray exposure factors
3. start and stop exposure
4. provides audible and visual signal that x-ray exposure is occuring
Term
what are the 5 generic controls of the console?
Definition
1. main power-on and off
2. kilovolt peak kVp
3. mA- milliamperage
4. timer
5. rotor-exposure switch
Term
kvp, mA, and timer
Definition
technique selection
Term
mA x seconds=
Definition
mAs
Term
kVp
Definition
quality; kilovoltage peak; penetrating abilities of an x-rays
Term
what is the range of kVp's in radiography?
Definition
30-150 kVp
Term
milliampherage
Definition
quantity of x-rays produced
Term
kilo
Definition
1000
Term
milli
Definition
.001
Term
the device that begins the exposure is the
Definition
rotor-exposure switch
Term
the rotor exposure has two switches
Definition
1. prep switch
2. exposure switch
Term
activation of the prep switch causes the
Definition
anode to rotate and prepares the x-ray tube
Term
how long does the prep phase take?
Definition
1-2 seconds
Term
the termination of the exposure must be indicated both
Definition
visually and audibly
Term
the duration of x-ray exposures may be established _____________ or _______________
Definition
manually or automatically
Term
AEC
Definition
automatic exposure control
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