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Rad 1333: Chapter 8 Pt 2 Questions and Verified Answers Updated 2025 Rated A
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______ are just as important, if not more so, when using digital IRs since the visual cues for over & underexposure are missing - ANSExposure technique charts A critical component in technique chart development is to? - ANSDetermine the minimal kVp value that adequately penetrates the anatomic part being radiographed Conditions for exposure technique chart? - ANS1: designed for the avg typical patient 2: a separate technique chart should be established for each X-ray tube. 3: accurate measurement of part thickness is critical. Exposure factors used for an adult skull can be used for pediatric patients ___ years of age or older because the skull is completely developed at this point. - ANS Once optimal radiographs are produced using the phantom, exposure techniques can be _____ for imaging other similar anatomic area. - ANSExtrapolated (mathematically estimated) One available method is to use the concept of ____, which is? - ANSComparative anatomy
A concept that states that different parts of the same size can be radiographed by use of the same exposure factors, provided that the minimal KVP value needed to penetrate the part is used in each case. Special consideration for geriatric patients? - ANSMay require a decreased exposure techniques (lower KVP, increase mA for shorter exposure time) May require additional patient care Special considerations for bariatric patients? - ANSIncrease kVp and mAs Require a grid May need to be imaged in quadrants Special considerations for casts and splints? - ANS-fiberglass casts: little to no change in exposure factors -Plaster casts: require increase in exposure factors -Splints: may require adjustment in exposure factors due to type of material if in the path of the x-ray beam Special considerations for pediatric patients? - ANSsmall size may require a reduction in exposure (kVp, mAs) quicker exposure times may be necessary Special considerations for projections and positions? - ANSmay require changes in exposure technique due to changes in tissue thickness
What are the advantages of fixed kVp/variable mAs? - ANS-Part measurement less critical -Increased accuracy with range of procedures -More consistent image contrast and overall quality -Part penetration assured What are the disadvantages of fixed kVp/variable mAs? - ANSOptimal kVp values not standardized What are the primary tools needed for developing a technique chart? - ANSRadiographic phantom Calipers Calculator What are the two types of exposure technique charts? - ANSvariable kVp/ fixed mAs fixed kVp/ variable mAs What do exposure technique charts standardize? - ANSselection of exposure factors for the typical patient so that the quality of image is consistent. What is a destructive disease? - ANSDisease or condition that decrease the absorption characteristics of the part making it less difficult to penetrate.
When APR is used in conjunction w/ AEC, the APR selects and displays: - ANSmanual exposure factors, and the AEC detectors to be used for a specific exam When it becomes necessary to compensate for an additive/destructive disease or condition, it is fundamentally correct to make changes to the ___ and a minimum of ___% is recommended - ANSkVp 15 Why do we change the kVp when pt has an additive/destructive disease or condition? - ANSkVp affects the penetrating ability of the primary beam