Fluoroscopy equipment, dose reduction technique, and common special procedure workflows tested on radiologic technology certification exams.
34 cards · basic cards · AI-written, checked twice. Edit anything.
- What device converts the x-ray image into visible light in older fluoroscopy units?
- The image intensifier
- What type of detector has largely replaced the image intensifier in modern fluoroscopy units?
- The flat panel detector
- What automatic system adjusts kVp and/or mA during fluoroscopy to maintain consistent image brightness?
- Automatic brightness control (ABC), also called automatic dose rate control
- How does switching to magnification mode affect patient entrance skin dose during fluoroscopy?
- It increases patient dose
- For a fixed (non-mobile) fluoroscopy unit, what is the minimum source-to-skin distance (SSD) required?
- 38 cm (15 inches)
- For a mobile fluoroscopy unit (C-arm), what is the minimum source-to-skin distance (SSD) required?
- 30 cm (12 inches)
- The fluoroscopy cumulative timer sounds an audible alarm after ____ minutes of beam-on exposure time.
- 5
- What fluoroscopic feature freezes and displays the last acquired image after the exposure stops, reducing the need for additional fluoro time?
- Last image hold
- How does pulsed fluoroscopy (compared to continuous fluoroscopy) affect patient dose?
- It reduces patient dose
- What simple technique reduces both patient dose and scatter radiation while improving image contrast during fluoroscopy?
- Collimation (restricting the field size)
- What effect does increasing distance between the x-ray tube and the patient have on skin dose, according to the inverse square law?
- It decreases skin dose
- What activation of a special high-level fluoroscopy mode allows exposure rates above the normal limit for better image detail?
- Boost mode (high-dose control mode)
- During fluoroscopy, where is the patient's entrance skin dose highest?
- At the point closest to the x-ray tube
- In an under-table (under-couch) fluoroscopy tube configuration, where does most scatter radiation originate relative to the tabletop?
- Below the tabletop, attenuated somewhat by the table and patient before reaching the operator
- Why does an over-table fluoroscopy tube configuration expose staff to more scatter than an under-table configuration?
- The x-ray tube is closer to the operator, and scatter originates near tabletop height without the table attenuating it first