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QC/QA
| Question | Answer |
|---|---|
| equipment, care & maintenance of image display systems pertains to | quality control |
| dealing with the people pertains to | quality assurance |
| continuous quality improvement QC+QA | CQI |
| when should visual inspections happen | daily |
| what are visual inspection examples | control panel, overhead tube crane, table, lead aprons/shields, ancillary equipment |
| 3 parts of QC checks | 1) visual inspection 2) environmental inspection 3) performance testing |
| t/f you should not fold your lead aprons | true |
| environmental inspection examples | high tension cables (fraying, discoloration, sparking) |
| low voltage where are the wires | inside the room |
| high voltage where are the wires | tucked away inside the generator |
| checks vertical beam alignment of CR | beam alignment |
| when checking the beam alignment semi-annually it should be within | + or - 2 degrees of vertical |
| checks the projected x-ray field vs. actual x-ray field | collimator accuracy |
| when checking the collimator accuracy semi-annually it should be within | + or - 2% of SID |
| what kind of test can we use to test the collimator accuracy | penny test |
| how do we check to see if the distance is accurate | measuring the SID and seeing if the indicator is the same should be + or - 2% of SID |
| when testing the focal spot size and condition it should be in what range | + or - of stated size of FS |
| to test the AEC what are we going to do | take 5 exposures |
| what range should the AEC be within when checked | + or - 10% |
| QAP | quality assurance program |
| Image receptor tests are done for : | 1. intrinsic (dark noise) 2. erasure thoroughness 3. plate/field uniformity 4. spatial resolution |
| how often should you erase CR detectors | every 48 hours |
| erasure thoroughness is also known as | ghosting |
| how can you test erasure thoroughness | |
| what are the three parts of the fluoro unit | 1. xray tube 2. generator 3. image intensifier (II) |
| input diameter squared/ output diameter squared | minificaiton gain |
| accleration of electrons increased kinetic energy so when they hit the output phosphor more light is released | flux gain |
| minification gain x flux gain | brightness gain |
| ability to be given a negative diagnosis when no disease is present | specificity |
| ability to detect disease | sensitivity |
| what is the main reason for repeats | positioning errors |
| how to find out the casual repeat rate | # of repeats for a specific cause / total # of repeats x 100 |
| total repeat rate | number of repeats/. x 100 total # of views taken |
| department rates should not exceed _ | 3-5% |
| mammography repeats should be less than _ | 2% |
| true positive | radiologist diagnosis disease |
| false positive | radiologist gives positive diagnosis, pt does not have disease |
| true negative | radiologists read exam as negative, additional tests show no disease |
| false negative | radiologist missed a diagnosis |
| TAT | turn around time |
| appears as speckled background | quantum mottle / image noise |
Created by:
macummins1
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