Camrt Final Exam Questions With 100% Verified Answers, Latest Updated 2024/2025 | Graded A+

How far away must the operator stand from the xray tube if not covered with lead? - Answer :3 meters Quiz :90% of man made radiation to the population is related to? - Answer :Medical Radiography and Dental Quiz :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 Quiz :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 Quiz :What lead equivalent must protective gloves/ gauntlets possess? - Answer :0.25mm of pb Quiz :What lead equivalent must ceiling mounted lead screens and moveable shields provide? - Answer :0.50mm of pb Quiz :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 Camrt Exam / 150 Questions With 100% Verified Answers | Updated 2024/2025 | Graded A+ For pregnant women an effective dose of 4 mSv must be applied for the remainder of the pregnancy from all sources Quiz :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* Quiz :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 Quiz :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. Quiz :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) Quiz :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 Quiz :The air kerma rate must not exceed ___ from scattered radiation of radioscopic equipment - Answer :2 mGy/h Quiz :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 Quiz :How frequently should IP's and cassettes be cleaned and inspected? - Answer :Cleaned: monthly Visual inspection: Weekly Quiz :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) Quiz :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 Quiz :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 Quiz :What should the monthly retake analysis be below? - Answer :5% Quiz :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 Quiz :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 -Integrity of protective equipment Quiz :Flexion/ Extension views of the C spine assess? - Answer :Anteroposterior mobility Quiz :CR angle for an AP coccyx is - Answer :10 degrees caudad Quiz :What does ERCP stand for, what 2 things is it done for? - Answer :Endoscopic Retrograde Cholangiopancreatography 1. Diagnose biliary and pancreatic pathological conditions 2. Investigate gallbladder, CBD, pancreatic ducts, and intervention Quiz :Test tool used to test focal spot - Answer :Slit camera, pinhole camera, star pattern Quiz :State the line focus principle - Answer :By angling the anode target the effective focal spot is made much smaller than the actual focal spot Quiz :What are the effects of a smaller anode angle? (more vertical) - Answer :-Smaller effective focal spot -Better spatial resolution -More anode heel effect -Smaller max size of collimation Quiz :What is the grid ratio? - Answer :The height of the lead strips divided by the distance between lead strips Ratio = h/D Quiz :Explain bit conversions for grids - Answer :5:1 Grid: 1 bit 8:1 / air gap: 2 bits 12:1 grid: 2.5 bits Quiz :SID bit conversions - Answer :100cm-122cm: 0.5 bit 100cm-180cm: 1.5 bit 122cm- 180cm: 1 bit *every 25cm change is a 0.5 bit change* Quiz :Bit conversions for part thickness - Answer :Every 5cm change = 1 bit Quiz :What errors will cause grid cut off with a parallel grid? - Answer :-SID too small -Angling against grid lines -Grid and CR not perpendicular Quiz :What errors will cause grid cut off with a focussed grid - Answer :- Incorrect SID (off focus) -Angling against grid lines - Off center - Grid and CR not perpendicular -Upside down grid Quiz :What does the autotransformer do? - Answer :Allows selection of a precise, controllable voltage Quiz :What does the line compensator do? - Answer :Measures the voltage provided to the xray imaging system and adjusts that voltage to precisely 220 V. Quiz :What does the high voltage generator do? What are its 3 parts? - Answer :Increases voltage from from the autotransformer. Volts -- kV 1. High voltage transformer 2. Filament Transformer 3. Rectifiers Quiz :What does the rectifier do? - Answer :Switches current from AC to DC so current is flowing in one direction