Help!
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| Timers are used for big or small body parts ? | show 🗑
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| AEC is used for big or small body parts? | show 🗑
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| Is a timer or AEC more accurate? | show 🗑
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| show | 1 ms
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| show | Angiography
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| show | Measures quantity of radiation reaching the IR and terminated the exposure when enough radiation has reached the IR to produce optimal images with decreases patient dose
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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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| show | Bigger
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| Increasing collimation will make the light field bigger or smaller? | show 🗑
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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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| Time it takes for AEC circuit to detect and react to the radiation received (usually 10 ms) is called? | show 🗑
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| What is backup timer? | show 🗑
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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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| What do the AEC density controls adjust? | show 🗑
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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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| What is the density setting for very young/very old/weak person? | show 🗑
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| What is the density setting for thin, easy to penetrate person? | show 🗑
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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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| show | KVp
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| What should we set the mAs to when using AEC? | show 🗑
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| show | Irradiation time is shorter that the minimum response time (IR will get enough exposure before the AEC can detect it and react to it therefore will not terminate when it is supposed to) = image being too dark
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| Time needed for body part = 7ms but machine stays on for 10 ms. This is an example of when we set the ââ too ââ- (low)? | show 🗑
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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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| Anatomy if interest must be placed directly over selected chamber. If there is not enough anatomy over chamber what will result? | show 🗑
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| show | Voltage from both chambers is averaged to end the exposure
Chamber that receives the most irradiation will have more influence
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| show | Checking timer accuracy
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| The formula for actual exposure time ? | show 🗑
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| show | Values cannot deviate from selected value by more than 10% + 1ms
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| show | Overloading the tube
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| show | Checking for consistency of exposure with AEC
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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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| show | The active chamber is beneath thicker tissue that the one being imaged
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| Performing an AP L-spine. Collimation is open to size of a 35x43 instead of collimating to the size of the spine. AP t-spine- is similar to l-spine Brighter and low contrast. What is this causing? | show 🗑
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| When should electronic timers been used instead of AEC? | show 🗑
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| 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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| show | Guard timer
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| Which is the most accurate of the X-ray exposure timers ? | show 🗑
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| show | Electronic timers
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| show | True
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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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| Does an AEC automatically terminate the exposure when the IR has recorded the required radiation intensity? | show 🗑
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| show | True
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| The AEC requires particular care, especially in exams that use low KVp such as mammography, because of the varying tissue thickness and composition the AEC may not respond properly at low KVp. T or F? | show 🗑
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| Solid state radiation detectors are now used for exposure-timer checks? T or F ? | show 🗑
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| show | Annually
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| AEC must respond within 1/60 of a second at 5 mAs for what? | show 🗑
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| show | 50kV, 600 mAs
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| show | Control panel selection error, positioning error, to little collimation
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| What is the advantage of using AEC? | show 🗑
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| What is the purpose of using AEC? | show 🗑
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| What is the purpose of AEC density controls? | show 🗑
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| AP of the right knee need what chamber ? | show 🗑
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| show | 2 outside chambers
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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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