Quiz yourself by thinking what should be in
each of the black spaces below before clicking
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Help!
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| show | Small
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| show | Big
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| show | Timer
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| A timer is accurate to what ms ? | show 🗑
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| What images are timers usually used for? | show 🗑
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| What does AEC do? | show 🗑
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| Tube- patient- table- grid- AEC/Timer - IR . What is this? | show 🗑
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| show | Solid state, and ionization chambers
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| Ionization chambers are ? | show 🗑
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| Which AEC works on p-n junction principle? | show 🗑
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| Decreasing collimation makes light field bigger or smaller? | show 🗑
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| show | Smaller
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| What is there detector in the ionization chamber? | show 🗑
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| When using AEC what will change with every patient? | show 🗑
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| show | Minimum response time
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| show | It is a safety feature .
The max time the exposure will go before terminating
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| If the wrong Bucky is selected, or if the wrong chamber is selected what are these examples of? | show 🗑
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| show | Amount of radiation required for exposure
Increases or decreases OD in IR by 25-30%
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| Density control in AEC increases or decreases OD in IR by how much? | show 🗑
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| show | AEC density controls
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| show | -2
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| show | -1
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| What is the density control setting for an average/normal build person? | show 🗑
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| What is the density setting for a very maucalur/large build person? | show 🗑
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| When should we use KVp? | show 🗑
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| Underexposed, light image = not enough radiation reaching the AEC detector = backup timer will kick in 2. If the backup timer allowed exposure to run long enough to compensate for low kVp, image will be OK but patient dose is increased. This will happen w | show 🗑
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| show | Highest possible for focal spot size
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| What happens if we set the mas too short (low)? | show 🗑
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| show | mA, short
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| What should the backup timer for the AEC be set for? | show 🗑
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| show | Prematurely end exposure before optimal density received = image too bright = BUT error
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| show | Exposure will go on for too long
Image = to dark
Increased patient dose
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| Unexpected tissue density is present and expected tissue density is absent are causes for problems with? | show 🗑
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| show | Fluid in lungs, emphysema, osteoporosis
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| show | AEC ends exposure early
Image = too light
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| How much current will it take to end exposure if more than 1 chamber is selected? | show 🗑
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| show | Checking timer accuracy
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| show | Actual exposure time = Arc size / 360
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| show | Values cannot deviate from selected value by more than 10% + 1ms
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| Timers help reducing the chance of ? | show 🗑
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| Different test varying mA, KVp, field size, conscience of detectors can all be used for what? | show 🗑
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| show | Radiation will reach outer chambers quick because there is not enough anatomy covering them so exposure terminates quickly.
Image brightness will be OK, but may be too light with quantum noise
Exposure # will indicate insufficient exposure
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| Imaging the abdomen but the middle chamber is activated Imaging a PA chest but lateral is selected- active chamber is beneath sternum Would terminate linger that requires. What is happening here? | show 🗑
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| show | Inadequate collimation causes excessive scatter radiation to reach AEC chamber causing an exposure that is too short
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| When should electronic timers been used instead of AEC? | show 🗑
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| Think if collimation as making something smaller, so when you are increasing collimator you are increasing how small it is, and when you are decreasing collimator you are decreasing how small it is | show 🗑
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| For any given radiographic exam, the number of X-rays that reach the IR is directly related to both the X-ray tube current and the time that the X-ray tube is energized. T or F? | show 🗑
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| What kind of timer will terminate an exposure after a prescribed time, usually approx. 6 s. Thus it is not possible for any timing circuit to continuously irradiate a patient for an extensive period? | show 🗑
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| Which is the most accurate of the X-ray exposure timers ? | show 🗑
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| Which timer allows a wide range of timer intervals to be selected and are accurate to intervals as small as 1 ms? | show 🗑
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| The product of mA and time -mAs- determines the total number of X-ray emitted and therefore the exposure of the IR? T or F? | show 🗑
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| What kind of timer monitors the product of mA and exposure time and terminates exposure when the desired mAs value is attained? | show 🗑
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| show | True
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| show | Yes
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| The AEC s radiolucent so that it will not interfere with the radiographic image? T or F?? | show 🗑
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| show | True
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| show | True
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| According to SC 35 how often should AEC be tested? | show 🗑
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| AEC must respond within 1/60 of a second at 5 mAs for what? | show 🗑
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| Current time product limit = back up timer states that the X-ray tube voltage is ââ or more, and the time product doesnât exceed âââ per irradiation? | show 🗑
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| show | Control panel selection error, positioning error, to little collimation
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| show | Allows for variations in tissue thickness and compensates for mA in tube correct
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| What is the purpose of using AEC? | show 🗑
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| show | To increase or decrease OD in the IR by 25-30%
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| AP of the right knee need what chamber ? | show 🗑
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| PA chest needs what chamber ? | show 🗑
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| AP of the left hip needs what chamber? | show 🗑
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| AP of the T spine needs what chamber? | show 🗑
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| Lateral is the L spine needs what chamber? | show 🗑
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| show | 1 outside, a middle
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Created by:
Em17