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72 Cards in this Set
- Front
- Back
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quality control define |
procedures to ensure certain performance standards are met |
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quality assurance define |
monitoring outcome parameters |
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what is the standard calibration? |
10 x 10 field size at 100 SSD +/- 2% or +/- 2mm |
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QA deals with... |
process |
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QC deals with... |
product |
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QA is ____________________ process |
preventive |
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QC is _______________________ process |
corrective |
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QA makes sure... |
we are doing the right thing the right way |
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QA makes sure... |
the results of what we've done are what we expected |
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What is the purpose of control panel and indicator light |
used to indicate operational function |
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what is the importance of control panel and indicator light |
essential to a correct and safe equipment operation |
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issues from control panel and indicator |
indicator light failure or a reading is not within acceptable range |
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what is the purpose of mechanical and electrical safety devices |
used to verify safety devices |
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mechanical and electrical safety devices should be __________________ meaning they |
fail safe meaning they should operate independently of any other circuit failure |
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inability to produce _________________ is an inconvenience, but inability to __________________ can cause serious damage |
motion, stop motion |
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what does the override switch do? and how often is it checked |
no motion will occur unless override switch is activated while primary switch is on checked weekly |
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what does the emergency off switch do? how often is it checked |
used in emergencies, normally in the on position, requires positive action to turn it off. when activated all motion should cease checked monthly |
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Main power switch: when is it used? |
only in extreme circumstances, not considered a back up system |
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primary control switch: examples |
couch controls, hand pendant |
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what are limit switches and how often is it checked |
it prevents mechanical motion beyond the machine design -checked quarterly |
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what does the collsion ring do and how often is it checked |
when touch, it stops machine motion, checked daily |
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what is the centrifugal switch, and how often is it checked |
controls starting circuit of electric motor, checked quarterly |
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when can the centrifugal switch be reversed |
only when the motor has slowed to a certain speed |
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what prevents the radiation beam from being turned on if the door is opened or interrupts the beam when opened |
door interlocks |
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importance of intercoms and monitors and door interlocks |
interrupt radiation beam if patient is in distress or moved |
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area radiation monitoring devices purpose |
warning lights activated by the electral power, turns of beam |
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importance of area radiation monitoring devices |
personnel protection: alerts therapist that the beam has shut down at either the appropriate dose of a fault has occured |
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methodology of the radiation monitoring devices |
pass or fail do not treat and notify physics |
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purpose of the distance indicator |
to set SSD/SAD treatments to a correct distance |
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how often is the SSD pointer checked |
weekly |
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light field, radiation field and colimator purpose |
to determine if the light and radiation fields are congruent and on central axis |
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importance of the light field, radiation field, and colimator |
light field is used as a guide to the size, shape, position, and directions of the radiation beam |
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machine dose rate purpose |
setting appropriate MUs should give a desired dose |
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importance of machine dose rate |
to ensure the patient receives the correct prescribed dose |
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ways to check machine dose rate |
diodes and online dosimeters |
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beam penetration quality purpose |
to make sure the desired dose at any depth for a given exposure is dependent on beam penetration |
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beam penetration importance |
exposure of patient to the correct machine output setting will result in delivery of prescribed dose at depth |
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beam penetration quality tests |
yellow flagged test red flagged test notify physics immediately |
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field symmetry define |
half of the beam profile is a mirror image of the other half |
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field flatness define |
defined as measurement of the output variation along the central 80% of the beam profile |
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purpose and importance of field flatness and symmetry |
ensure that symmetry and flatness of the radiation beam are within the baseline profile |
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how to check for field symmetry and flatness |
use tracker daily |
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mechanical and optical patient alignment devices purpose |
to properly position patient for treatment |
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methodology for mechanical and optical patient alignment devices |
notify physics if not within specifications |
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linear scales on treatment tables purpose |
using scales or digital readouts to indicated table height, longtitudinal, and transverse table top motion |
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how to check linear scales on treatment tables |
test comparing isocenter to some point below isocenter using scale or digital readout |
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collimator rotation purpose |
defines the radiation field of treatment |
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why is it important to check the collimator rotation |
to have reproducibility of day to day setups |
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how to check collimator rotation |
spirit level |
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gantry rotation puspose |
angular positions be accurately read |
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importance of gantry rotation |
to deliver proper dose and irradiate desired tumor sites |
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how to check gantry rotation |
spirit level |
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purpose of stability of isocenter under collimator and gantry rotation |
production of a geometrically well defined treatment field which is aimed at the same point under varying machine or couch positions |
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importance of stability of isocenter under collimator and gantry rotation |
there will be a shift of opposed fields relative to one another when using isocentric technique |
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treatment couch isocenter puspose |
used for specialized treatment plans |
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importance of the treatment couch isocenter deviation |
will show early indicator of problems |
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how to correct treatment couch isocenter |
physics will tape piece of paper to psa isocenter while rotating the couch pedastal |
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control panel and indicator light -frequency -materials |
daily warm up Argus |
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mechanical and electrical devices -frequency -material |
dependent on test dependent on test |
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intercom, monitor, and door interlocks -freq -material |
daily argus |
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radiation monitoring devices -freq -materials |
daily argus |
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distance indicators -freq -material |
daily (+/- 2mm argus |
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light field, radiation field, and collimator -freq -material |
daily (+/- 2mm)....monthly in community argus |
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machine dose rate -freq -material |
-daily (+/- 2%)...3% in community -phantom, diodes, tracker |
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beam penetration -freq -material |
daily (+/- 2%) tracker |
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field symmetry and flatness -freq -material |
daily (+/-2%) tracker |
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mechanical and optical pt alignment devices -freq -material |
daily (+/- 2mm at iso) argus |
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linear scales on tx table -freq -material |
monthly (+/-2mm) metric ruler |
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collimator rotation -freq -material |
monthly (+/- 1 degree) spirit level |
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gantry rotation -freq -material |
monthly (+/- 2%) spirit level |
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treatment couch isocenter -freq -material |
monthly (+/- 2mm) no special materials |
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isocenter stability under rotation of gantry and collimator |
monthly (+/- 2mm) split field test |
