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RADT 465

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

QuestionAnswer
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