CAMRT MRI Questions and Answers
How far away must the operator stand from the xray tube if not covered with lead? -
CORRECT ANSWER-3 meters
90% of man made radiation to the population is related to? - CORRECT ANSWERMedical Radiography and Dental
For each peak xray voltage, what lead equivalent...
CAMRT MRI Questions and Answers
How far away must the operator stand from the xray tube if not covered with lead? -
CORRECT ANSWER-3 meters
90% of man made radiation to the population is related to? - CORRECT 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+) - CORRECT 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 - CORRECT
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? - CORRECT
ANSWER-0.25mm of pb
What lead equivalent must ceiling mounted lead screens and moveable shields
provide? - CORRECT ANSWER-0.50mm of pb
What are the annual radiation dose limits for radiation workers? - CORRECT 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? - CORRECT
ANSWER-Whole body = 1mSv
,Lens of the eye= 15mSv
Skin = 50mSv
Hands = 50mSv
All other organs = 50mSv
*these also apply for students*
What are primary protective barriers? Give examples - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT ANSWER-Not equipped with AIC: 50mGy/min
With AIC: 100mGy/min
The air kerma rate must not exceed ___ from scattered radiation of radioscopic
equipment - CORRECT ANSWER-2 mGy/h
HVL of Aluminum for given tube voltages? (70kV-150kV) - CORRECT ANSWER-70:
2.5mm
80: 2.9mm
90: 3.2mm
How frequently should IP's and cassettes be cleaned and inspected? - CORRECT
ANSWER-Cleaned: monthly
Visual inspection: Weekly
What are daily QC tests for CR/DR/Fluoro/CT equipment - CORRECT 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 - CORRECT 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 - CORRECT 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? - CORRECT ANSWER-5%
What are quarterly QC tests for CR/DR/Fluoro/CT - CORRECT 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
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