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exposure-chap 11

exposure self test questions

QuestionAnswer
as the difference between adjacent densities increases, contrast decreases TRUE OR FALSE false
a radiograph can have contrast and no density TRUE OR FALSE false
a radiograph can have density and no contrast TRUE OR FALSE true
as kVp increases, contrast decreases TRUE OR FALSE true
increased kVp causes density differences that were previously undetectable to become visible TRUE OR FALSE true
as compton scatter increases, contrast decreases TRUE OR FALSE true
as body part thickness decreases, contrast increases TRUE OR FALSE true
as field size increases, contrast increases TRUE OR FALSE false
contrast evaluation can be made only when sufficient density exists TRUE OR FALSE true
at 100 kVp range, a visible change in contrast will not be seen until kVp has changed 10% or more TRUE OR FALSE true
kVp controls the relationship between photoelectric vs compton interactions TRUE OR FALSE true
detail of radiographs is visible b/c of sufficient contrast and density TRUE OR FALSE true
difference between 2 adjacent densities is called? distortion, scatter, fog, magnification distortion
a radiograph with few shades of gray exhibit HIGH or LOW contrast? high
which provides more info, LOW contrast or HIGH contrast? low contrast
which is the controlling factor of contrast kVp or mAs kVp
A radiograph that demonstrates considerable differences between densities is? SHORT SCALE/LONG SCALE HIGH CONTRAST/LOW CONTRAST short scale/high contrast
a radiograph that demonstrates little difference between densities is? SHORT SCALE/LONG SCALE HIGH CONTRAST/LOW CONTRAST long scale/low contrast
as kVp _______ a ________ range of photon energies is produced INCREASES/DECREASES WIDER/SHORTER increases, wider
a change from 70 kVp to 80 kVp will do what to the density? double the density
what percent in increase will double density? 15% increase
a high kVp will result in? LOW CONTRAST/HIGH CONTRAST WIDE LATITUDE/NARROW LATITUDE low contrast/wide latitude
an increase in kVp will have? LONG SCALE CONTRAST/SHORT SCALE CONTRAST long scale contrast
higher energy x-rays are MORE PENETRATING/LESS PENETRATING more penetrating
higher penetrating x-rays are called HARD X-RAY/SOFT X-RAYS hard x-rays
what are the factors that affect quantity? mAs, kVp, Distance, Filtration
what are the factors that affect quality? kVp, filtration
# of x-ray photons in the useful beam are known as? X-RAY QUANTITY/X-RAY QUALITY quantity
measurement of penetrating ability of an x-ray beam is called? X-RAY QUANTITY/X-RAY QUALITY quality
exposure time is not directly proportional to the # of electrons crossing the tube? TRUE OR FALSE false
unit describing tube current and exposure time? mAs or kVp mAs
kVp is the primary controller of quantity? TRUE OR FALSE false
mA is not directly proportional to tube current TRUE OR FALSE false
x-ray quantity is directly proportional to mAs TRUE OR FALSE true
kVp is the primary controller of film density TRUE OR FALSE false
mA is directly proportional to the tube current TRUE OR FALSE true
mA is the primary controller of quantity TRUE OR FALSE true
mAs is the primary controller of film density TRUE OR FALSE true
exposure time is directly proportional to the # of electrons crossing the tube TRUE OR FALSE true
there an inverse relationship between quantity and distance TRUE OR FALSE true
Created by: srehrauer
 

 



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