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CAMRT EXAM QUESTIONS AND ANSWERS!!
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CAMRT EXAM QUESTIONS AND ANSWERS!!
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CAMRT EXAM QUESTIONS AND ANSWERS!!How far away must the operator stand from the xray tube if not covered with lead? - Answer 3 meters
90% of man made radiation to the population is related to? - Answer Medical Radiography and Dental
For each peak xray voltage, what lead equivalent is required?
100kV or less (o-100)
Between 101kV-149kV
150kV or greater (150+) - Answer 0-100kV = 0.25mm of lead
Greater than 100kV but less then 150kV = 0.35mm of lead
150kV or greater = 0.50mm of lead
What protective equipment is required during interventional procedures - Answer Full
wrap around protective gowns of 0.50mm pb in the front panels and 0.25mm pb in the back panels Thyroid shields with an equivalent of 0.50mm of pb
Lead drapes/curtains mounted to II of 0.25mm of pb at 100kv
What lead equivalent must protective gloves/ gauntlets possess? - Answer 0.25mm of pb
What lead equivalent must ceiling mounted lead screens and moveable shields provide? - Answer 0.50mm of pb
What are the annual radiation dose limits for radiation workers? - Answer Whole body= 20mSv
Lens of eye= 150mSv
Skin = 500mSv
Hands = 150mSv
All other organs = 500mSv
For pregnant women an effective dose of 4 mSv must be applied for the remainder of the pregnancy from all sources
What are the annual radiation dose limits to members of the public? - Answer Whole body = 1mSv Lens of the eye= 15mSv
Skin = 50mSv
Hands = 50mSv All other organs = 50mSv
*these also apply for students* CAMRT EXAM QUESTIONS AND ANSWERS!!
What are primary protective barriers? Give examples - Answer Primary barriers provide shielding from the direct xray beam. Such as, the walls and floor where the tube can be directed
-The wall behind the wall bucky
-Floor under the table
What are secondary barriers and give examples - Answer Provide shielding against both leakage and scattered radiation. Walls that the primary beam is not directed towards and the ceiling are secondary barriers.
The control booth is also a secondary barrier, the primary beam should never be directed towards it.
What should the focal spot to skin distance be for:
-Mobile equipment
-Stationary equipment -Radioscopic equipment - Answer Must not be less than:
-Mobile: 30cm
-Stationary: 38cm
-Radioscopic: 20cm (designed for special procedures that would be impossible at 30cm or 38cm)
What are the maximum air kerma rates for radioscopic equipment:
-with automatic intensity control
-without AIC - Answer Not equipped with AIC: 50mGy/min
With AIC: 100mGy/min
The air kerma rate must not exceed ___ from scattered radiation of radioscopic equipment - Answer 2 mGy/h
HVL of Aluminum for given tube voltages? (70kV-150kV) - Answer 70: 2.5mm
80: 2.9mm
90: 3.2mm
100: 3.6mm
110: 3.9mm
120: 4.3mm
130: 4.7mm
140: 5.0mm
150: 5.4mm
How frequently should IP's and cassettes be cleaned and inspected? - Answer Cleaned: monthly CAMRT EXAM QUESTIONS AND ANSWERS!!
Visual inspection: Weekly
What are daily QC tests for CR/DR/Fluoro/CT equipment - Answer -Warm up (all)
-Meter operation (all)
-Equipment condition (all)
-System movements (fluoro)
-Visual assessment of electronic display devices (all)
What are weekly QC tests for CR/DR/Fluoro/CT equipment - Answer - Visual inspection of cleanliness of system (all)
-Laser film printer operation (all)
-CT # accuracy
-CT noise -CT uniformity
What are monthly QC tests for CR/DR/Fluoro/CT equipment - Answer -Cassette, screen, IP plate cleaning (CR)
-Retake analysis (CR/DR)
-Electronic display device performance (all)
-Laser film printer operation (all)
-CT slice thickness
-CT # calibration
-CT # linearity
What should the monthly retake analysis be below? - Answer 5%
What are quarterly QC tests for CR/DR/Fluoro/CT - Answer -Collimator operation (CR/DR/Fluoro)
-Interlocks (all) (on doors to prevent exposure if door is open)
-Compression devices (Fluoro)
-Table angling/motion (Fluoro)
-Fluoro protection devices (lead drapes = .25mm of pb)
-CT patient support movement -CT spatial resolution -CT low contrast detectability
What are the annual QC tests for CR/DR/Fluoro/CT - Answer -Accuracy of loading factors (CR/DR/fluoro)
-Output reproducibility -Output linearity
-Beam filtration -AEC
-Beam/light field alignment - Beam collimation -Grid performance -EI
-Dynamic Range
-Spatial resolution
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