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# RADT 465

### ARRT registry review covering equipment operation, QA, etc. content area

Question | Answer |
---|---|

What is the voltage ripple for a 3 phase 6 pulse generator? | 13% |

What is the voltage ripple for a 3 phase 12 pulse generator? | 3-4% |

What is the voltage ripple for a high frequency generator? | <1% |

What is the voltage ripple for 1/2 wave and full wave generators? | 100% |

How often should lead apron checks be done? | annually |

What are the input phosphor sizes? | 25 cm, 17 cm, 12 cm |

What are input phosphors made of? | cesium iodide |

What is the average output phosphor size? | 1-2.5 cm |

What are output phosphors made of? | cadmium sulfide |

How do you decrease magnification without using the mag mode button? | increase SID, decrease OID |

What is the brightness gain formula? | minification x flux gain |

What is the magnification factor formula? | input1/input2 |

What kind of interaction is caused by the energy from slowing down of electrons that produces an x-ray | Brehmsstrahlung |

Which interaction can produce an x-ray from any kV? | Brehmsstrahlung |

The binding energy released from an outer shell electron that produces an x-ray is what type of interaction? | Characteristic |

As frequency ______, wavelength _______ and energy _______ | increases, decreases, increases |

What is radiation that exits the tube? | primary radiation |

What is radiation that exits the patient? | remnant radiation |

How often should CR cassettes be erased? Cleaned? | erased every 24-48 hours; cleaned monthly |

inverse square formula | I1/I2 = (d2)squared/(d1)squared |

heat unit formula | kVp x mA x seconds x generator x # of exposures taken |

unsharpness formula | filament size x OID/SOD |

positive density every 3.14" perpendicular to the direction of film travel for 1" roller | pi lines |

appear as scratch lines parallel to direction of film travel separated by 1-2" | guide shoe marks |

How often should fluoroscopy output be tested? | every 6 months |

What type of exams would have a type 1 histogram? | hand, foot, ankle, pelvis |

What type of exams would have a type 2 histogram? | abdomen |

What type of exams would have a type 3 histogram? | contrasted studies, prosthetics, metal hardware |

Where is the range for the exposure indicator number found? | between S1 and S2 on a histogram |

Where is the VOI/ROI found on a histogram? | between S1 and S2 on a histogram |

As DQE _________, patient dose goes __________ | increases, decreases |

EI is ____________ proportional to exposure of the image receptor | directly |

S-number is __________ proportional to exposure of the image receptor | inversely |

What is the ability of a digital system to display changes in gray scale values-bit depth? | contrast resolution |

What is the ability of a system to record adjacent small structures? | spatial resolution |

What is optimal kVp for extremities-peds? | 60-70 |

What is optimal kVp for small extremities? | 64 |

What is optimal kVp for medium extremities? | 72-76 |

What is optimal kVp for large extremities? | 80-86 |

What is optimal kVp for small parts of the skull? | 76 |

Where all digital images are stored | PACS, picture archival communication system |

Order entry, patient demographic information; frequently integrated with PACS and sometimes HIS/EMR | RIS, radiology information system |

What is optimal kVp for skull (general)? | 90 |

What is optimal kVp for abdomen, pelvis, lumbar? | 90 |

What is optimal kVp for vertebral column (C&T spines)? | 86 |

What is optimal kVp for nongrid/grid? | 86/120 |

What is optimal kVp for barium based contrast media studies plain/double contrast? | 120/100 |

What is optimal kVp for iodine based contrast media studies? | 80 |

Patient demographic information, billing, supplies, order entry for testing | HIS, hospital information system |

Patient medical charts | EMR/EHR, electronic medical record/electronic health record |

Standard developed to interconnect medical digital imaging devices | DICOM, digital imaging and communications in medicine |

Created by:
lnemge1