Fluoroscopy Quiz (Revised) with correct answers 100%

Fluoroscopy Quiz (Revised) with correct answers 100% Fluoroscopy - Correct Answer uses a continuous beam of x-rays to create images of the movement of internal structures that can be viewed on a monitor. True or False? Releasing the pressure applied to the deadman switch will terminate the radiation exposure during fluoroscopy. - Correct Answer True Fluoroscopy - Correct Answer allows imaging of anatomy in motion, or dynamic imaging. Image intensification - Correct Answer is the process that the exits radiation from the anatomic area of interest interacts with the input phosphor for conversion to visible light, which are converted to electrons by a photocathode, then focused by electrostatic focusing lenses, and accelerated toward an anode to strike the output phosphor. True or False? X-rays exiting the patient interact with the image intensifier to produce light photons which are then converted to electrons and finally back to light energy. - Correct Answer True Output phosphor - Correct Answer is coated with light-emitting crystals to absorb electrons and emit light. Input phosphor - Correct Answer absorbs x-rays and emits light. Photocathode - Correct Answer absorbs light and converts light to electrons. True or False? The input phosphor is considerably larger than the output phosphor. - Correct Answer True True or False? The image at the output phosphor is brighter in part because it is significantly smaller than the same image at the input phosphor. - Correct Answer True Conversion factor - Correct Answer another descriptor of the overall ability of an image intensifier to create a brighter image, is measured in cd/m2/mR/s. Brightness gain - Correct Answer minification gain x flux gain. Conversion factor - Correct Answer is a newer term for brightness gain and is typically about 1% of the brightness gain value. ABC (Automatic Brightness Control) - Correct Answer maintains the brightness and contrast of the fluoroscopic image during the procedure. Magnification of the fluoroscopic image - Correct Answer occurs when the electrostatic lenses have more voltage applied, creating a more negative charge. magnification factor during fluoroscopic - Correct Answer equal to the full size input phosphor divided by the selected input phosphor. Using the magnification mode - Correct Answer improves spatial resolution of the fluoroscopic image. True or False? Additional x-ray photons must leave the patient and be absorbed by the image intensifier when magnification mode is used. resulting in increased patient dose.*** - Correct Answer True What is the typical spatial resolution range capabilities in fluoroscopic systems? - Correct Answer 4 to 6 Lp/mm Shape distortion during fluoroscopy - Correct Answer is the result of the curved shape of the input phosphor and photocathode. Pincushion appearance - Correct Answer is the distortion of the fluoroscopic image that appears as unequal magnification. Vignetting - Correct Answer is the loss of brightness around the periphery of the fluoroscopic image. True or False? When a fluoroscopic image has noise, or is noisy, the quantity of radiation (mA) must be increased because the issue is too few photons being used to create the image. - Correct Answer True Fluoroscopic image - Correct Answer is viewed by looking at a television monitor. vidicon camera tube - Correct Answer is used for viewing the fluoroscopic image. Raster pattern - Correct Answer involves a path from left to right, from the top to the bottom. Charge-Coupled Device (CCD) - Correct Answer includes semiconductor capacitors. True or False? Each capacitor in a CCD briefly stores an electrical charge that represents a pixel in the digital image. - Correct Answer True True or False?