CAMRT Quality control Distinction Guarantee Exam Questions & Answers

Describe radiation reproducibility - ACCURATE ANSWER-For any combination of operating loading factors, the coefficient of variation of any 10 consecutive irradiation measurements at same SID within one hour is not greater than 0.05 and each of the ten measurements is 15% of the mean value of the ten measurements Describe radiation output linearity - ACCURATE ANSWER-For any preselected tube voltage the quotient of the average air karma measurement divided by the current time product obtained at two applicable settings must not differ by more than 0.10 times their sum Explain linearity in radiography - ACCURATE ANSWER-Is the production of a constant amount of radiation for different combinations of millliamperage and exposure time, sequential increases in mAs shoudl produce the same sequential increase in the exposure measured What is minimum irradiation time capability - ACCURATE ANSWER-The controlling timer or AEC control device must have a minimum irradiation time capability of 1/60s or the time required to deliver a current time produce of 5 mAs which ever is greater Describe kVp accuracy - ACCURATE ANSWER-The loading facotrs must not deviate from the selected value, for any combination of loading factors by more than 10% X-ray tube voltage What is the test done for kVp accuracy - ACCURATE ANSWER-Dosimeter, three exposures at same kVp values, take the average of the three exposures and determine if the are in the acceptable range Avaerage kVp - set kVp / set kVp x 100 Accuracy of loading time - ACCURATE ANSWER-10% + 1ms