CAMRT PRACTICE EXAM CERTIFIED QUESTIONS AND Answers Verified 100% Correct

CAMRT PRACTICE EXAM CERTIFIED QUESTIONS AND Answers Verified 100% Correct The air kerma rate must not exceed ___ from scattered radiation of radioscopic equipment - CORRECT ANSWER- 2 mGy/h 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 HVL of Aluminum for given tube voltages? (70kV - 150 kV) - CORRECT ANSWER - 70: 2.5 m m m 80: 2.9 m 90: 3.2 m m mm 100: 3.6 110: 3.9 mm 120: 4.3 mm 130: 4.7 m m 140: 5.0 mm 150: 5.4 mm 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 What are the annual QC tests for CR/DR/Fluoro/CT - CORRECT 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 Flexion/ Extension views of the C spine assess? - CORRECT ANSWER- Anteroposterior mobility CR angle for an AP coccyx is - CORRECT ANSWER- 10 degrees caudad What does ERCP stand for, what 2 things is it done for? - CORRECT ANSWER- Endoscopic Retrograde Cholangiopancreatography 1. Diagnose biliary and pancreatic pathological conditions 2. Investigate gallbladder, CBD, pancreatic ducts, and intervention Test tool used to test focal spot - CORRECT ANSWER- Slit camera, pinhole camera, star pattern State the line focus principle - CORRECT ANSWER- By angling the anode target the effective focal spot is made much smaller than the actual focal spot What are the effects of a smaller anode angle? (more vertical) - CORRECT ANSWER- - Smaller effective focal spot -Better spatial resolution -More anode heel effect -Smaller max size of collimation What is the grid ratio? - CORRECT ANSWER- The height of the lead strips divided by the distance between lead strips Ratio = h/D Explain bit conversions for grids - CORRECT ANSWER- 5:1 Grid: 1 bit 8:1 / air gap: 2 bits 12:1 grid: 2.5 bits SID bit conversions - CORRECT ANSWER- 100cm-122cm: 0.5 bit 100cm-180cm: 1.5 bit 122cm- 180cm: 1 bit *every 25cm change is a 0.5 bit change* Bit conversions for part thickness - CORRECT ANSWER- Every 5cm change = 1 bit What errors will cause grid cut off with a parallel grid? - CORRECT ANSWER- -SID too small -Angling against grid lines -Grid and CR not perpendicular What errors will cause grid cut off with a focussed grid - CORRECT ANSWER- - Incorrect SID (off focus) -Angling against grid lines - Off center - Grid and CR not perpendicular