QUALITY CONTROL OF IMAGING EQUIPMENT AND ACCESSORIES
100
What regulates the duration of an x-ray exposure?
What is the timer!
100
What does the backup timer do?
What is protects the patient from overexposure and the x-ray tube from overheating
100
What are the distances allowed for fixed and mobile fluoroscopy?
What is 15" and 12"
100
Which modality is more sensitive to secondary/scatter radiation- CR or DR?
What is DR
100
What is SPATIAL (spey- shuhl) resolution??
What is the level of detail or sharpness on the CR image.
200
What provides the variation of voltage flowing in the x-ray circuit and applied to the x-ray tube?
What is an Autotransformer!
200
What are the distances for fixed and mobile x-ray units?
What is "15" for fixed, 12" for mobile"
200
What does the input phosphor do in the image-intensifier tube?
What is receives exit rays from the patient and converts them into visible light
200
What kind of detectors do flat panel DR systems use?
What is indirect and direct detectors
200
What are examples of artifacts on a CR image?
What is dust on imaging plate, improper use of grids, and scatter radiation
300
What type of interaction produces the most x-rays (at a diagnostic level).
What is Bremsstrahlung interactions
300
How many x-rays are produced when projectile electrons collide with the atoms of the target material?
What is 0.2%
(99.8% is heat)
300
What are automatically adjusted during fluoroscopy by a process known as automatic brightness control (ABC)
What is kVp and mA
300
What is the imaging plate made of?
What is a photostimulable phosphor that is applied to a semirigid support layer (PSP).
300
What is quality control?
What is a program that specifically addresses the safe and reliable operation of equipment
400
Which of the following are more penetrating? Long- wavelength or Short wavelength rays?
What is short wavelength rays!
400
Which phase creates more x-rays? 3-phase high frequency, or single-phase units?
What is 3-phase, high-frequency units (produces 12%-16% more)
400
What does varying the voltage flowing through the image-intensifier tube do?
What is changes the size of the area on the input phosphor/photocathode being used.
400
What is the angle of arc through which the x-ray tube travles?
What is the exposure angle
400
What is the necessary gap of which the collimator must be accurate?
What is within 2% of the SID
500
What is the inverse square law?
What is "the intensity of the x-ray beam is inversely proportional to the square of the distance between the source of the x-rays and the object"
500
What consists of several flat ionization chambers that are located in the bucky between the patient and the IR?
What is the Automatic Exposure Control
500
For every photon that goes in, how many light photons come out?
What is 5,000-20,000
500
What does the image-intensifier tube consist of?
What is the input phosphor, photocathode, electrostatic lenses, output phosphor
500
What is a complete program in a radiology department that addresses all aspects of quiality (including customer service, image interpretation, accuracy of diagnosis, and distribution of radiologist's report)