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Rad 1333 chapter 8 pt. 1 Questions and Correct Answers Updated 2025 Graded A
Typology: Exams
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____ selected for each exam should provide an appropriate level of subject contrast & is atleast the minimum needed to penetrate the part regardless if AEC is used. - ANSkVp ____ should not be used on a routine basis - ANSDensity control AEC controls only the ______________ of radiation reaching the IR and has no effect on other image characteristics, such as ________________. - ANSQuantity Contrast
devices Phototiming Besides kvp, ____ should also be selected as usual for a particular exam regardless of AEC - ANSmA Decreasing the mA ____ the exposure time when using AEC. - ANSIncreased Each ____ system is calibrated to a specific type of IR. - ANSAEC Each number on the density control changes ____ - ANSExposure times by a certain predetermined amount expression as a % Excessive coloration may result in _____. - ANSToo long exposure For an AEC system to function properly, ____ & ____ are essential. - ANSCalibration QC testing higher kvp means ____ time to reach predetermined exposure for AEC - ANSLess How does the backup time act like a safety mechanism? - ANSIt protects the patient from unnecessary exposure It protects the x-ray tube from reaching or exceeding its heat-loading capacity
If the backup time is automatically controlled, it should terminate at a maximum of ________ mAs, when equipment is operating at or above _____ kVp - ANS 50 Increasing the mA ____ the exposure time when using AEC. - ANSDecreases Insufficient collimation may result in _____ causing exposure to terminate too quickly - ANSExcessive scatter Ionization chamber AEC devices are considered _____ devices because? - ANSentrance-type The detectors are positioned in front of IR, radiation must enter the detector before interacting with the IR. Ionizationi chambers are less ____ and less ____ than phototimers but are also less ____ - ANSSophisticated Accurate Prone to failure Lower kvp means ____ time to reach predetermined exposure for AEC. - ANSMore Most AEC systems today use? - ANSionization chambers Phototimer AEC devices are considered _____ devices because? - ANSExit type The detectors are positioned behind the IR, which means radiation must exit the IR before its measured by the detectors Phototimers use a ____ and a ___ that converts light to electricity - ANSFluorescent (light-producing) screen Device Regardless of type of AEC, almost all systems use a ___. - ANSSet of 3 radiation- measuring detectors, arranged In a specific manner. The ______ acts as a safety mechanism when an AEC system fails or equipment is not used properly. - ANSBackup time The basic process of ionization chambers: - ANSIonization chamber is a hollow cell that contains air and is connected the timer circuit via an electrical wire.
What is a photomultiplier tube? - ANSElectronic device that converts visible light energy into electrical energy. What is AEC? - ANSA system used to consistently control the amount of radiation reaching the image receptor by terminating the length of exposure. What is backup time? - ANSThe maximum length of time the x-ray exposure continues when using an AEC system What is minimum response time? - ANSshortest exposure time that the system can produce What is the basic principle of operation on AEC devices? - ANSRadiation is transmitted through pt, it then is converted into an electrical signal, triggering the termination of exposure What is the common increment on the density control? - ANS25% What is the general guideline in selecting AEC detectors for an exam? - ANSSelect the detector(s) that would be superimposed by the anatomic structures that are of greatest interest and need to be visualized on image What is the mAs readout? - ANSthe actual amount of mAs used for that image is displayed immediately after the exposure What is the patient positioning when using AEC detectors - ANSThe anatomy area of interest must be centered property over the selected detector(s) When using AEC, the radiographer must still select appropriate kVp, mA, and grid but the AEC device determines the? - ANSExposure time With most modern ACC systems, the minimum response time is? - ANS1 ms