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A concise overview of fluoroscopy, focusing on its key components and operational principles. It covers the functions of the x-ray tube, image intensifier, and video monitoring system, along with essential aspects such as image magnification, distortion, and radiation exposure rates. The material is presented in a question-and-answer format, making it useful for exam preparation and quick review. It also addresses the role of automatic brightness control (abc) and the significance of field of view (fov) in different fluoroscopic examinations. Designed to help students and professionals understand the fundamental concepts and safety measures associated with fluoroscopy, enhancing their knowledge and skills in medical imaging.
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Three main components of a fluoroscopic unit - correct answer ✅-xray tube and generator -image instensifier -video monitoring system How often should the fluoro machine be tested - correct answer ✅Every 6 months The image intensifier converts remnant radiation into... - correct answer ✅Amplified light image What does the glass envelope or vacuum tube do - correct answer ✅Allows free flow of electrons to move from one side to the other What does the input phosphor do - correct answer ✅-converts x-rays to light -varies from 6-16in. (15-40cm) -curved to maintain equal distance between all parts on input to output -comprised of cesium iodide crystals
What does the photocathode do - correct answer ✅Converts visible light into electrons Electrostatic focusing lenses - correct answer ✅Focusing and accelerate electrons towards output phosphor Accelerating anode - correct answer ✅Attracts electrons from the photocathode and accelerate them towards the output screen output phosphor - correct answer ✅-comprised of zinc cadmium sulfide -typically 1in or 2.5cm -electrons strike and are converted to a more intensified light Factors that affect the brightness of fluoro - correct answer ✅-mA -kV
Table top exposure rate - correct answer ✅-21 mGy/min/mA @ 80kv -100 mGy/min in equipment without high level fluoro capacity -200 mGy/min in high level fluoroscopy Mobile Fluoroscopy distance - correct answer ✅12in (30cm) Fixed fluoroscopy distance - correct answer ✅15in (37cm)