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RADT 241 TEST REVIEW QUESTIONS AND ANSWERS
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RADT 241 TEST REVIEW QUESTIONS AND ANSWERS
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RADT 241 TEST REVIEW QUESTIONSAND ANSWERS
the maximum exposure received by the patient is at the - Answer -(ESE) entrance skin
exposure
the radiation intensity from a diagnostic x-ray unit will vary in a direct relationship with? -
Answer --mAs
-kvp^2
*inverse relationship w/ the square of the distance
which anatomical part will deliver the lowest (ESE)? - Answer --hip *lot of tissue
-pelvis
-l-spine
-elbow
answer: ELBOW *smallest technical factors
a radiographer can reduce pt dose by at least how much % in most examinations by
choosing correct exposure factors? - Answer -50%
to reduce pt exposure the ***** consistent with the image quality should be selected? -
Answer --highest mAs
-shortest distance
-highest kVp
answer: highest kVp
pt ESE decreases as SID increases? - Answer -TRUE
*distance -they have a inverse relationship
when the primary beam field size decreases what happens to pt exposure? - Answer -
decreases
the 3 types of gonad shields? - Answer -1. shape contact
2. flat contact
, 3. shadow contact
when using a radiographic grid will it decrease or increase pt exposure? - Answer -
increase *have to shoot more mAs when using grids for quality
entrance skin exposure (ESE) is considered what type of exposure? - Answer -MAXIMUM
why Is skull radiography PA projection preferred over AP? - Answer --less exposure to
eyes
when pt SID or SOD increases pt (ESE) does what? - Answer -decreases
*inversely proportional
when comparing (ESE) and actual dose to area of interest the actual dose is? - Answer -
lower than (ESE)
*you always want to overestimate w/ ESE
the recommended SID for routine radiography ? - Answer -44"-48"
what should be used in an effort to minimize pt dose? - Answer -longer SODS'S minimize
pt dose
how is (ESE) calculated ? - Answer -at the min SOD
what are the 2 classes of digital radiographic systems? - Answer -1. direct
2. indirect
computers operate using what type of language? - Answer -binary
each binary # is called a? - Answer -bit
an 8 bit word is called a? - Answer -byte
what are the 2 steps to analog digital conversion? - Answer -1. quantification
2. sampling
what posses a third dimension? - Answer -a voxel
a graphical analysis of signal values from min to max values in a data set is termed a ? -
Answer -histogram
the shape and distribution of values on a x-ray exposure histogram is specific to selected
anatomy; the exposure used for the exam? - Answer -T
in that histogram the data is analyzed to identify the? - Answer -values of interest
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