Fluoroscopy test with correct answers 100%

Fluoroscopy test with correct answers 100% 1. One frame of a TV image consists of how many lines - Correct Answer 525 nm . A digital fluoroscopy system with a 1024 x 1024 matrix size is also called what? - Correct Answer 1000 line system How does the pixel size and the matrix size of a digital fluorography system effect spatial resolution? - Correct Answer Small pixel and large matrix has better resolution According to cosine law, where should the viewer sit in relation to the workstation? - Correct Answer Straight one What is the major disadvantage of video tape recording opposed to cinefluorography filming - Correct Answer Low resolution What is normal integration time for humans? - Correct Answer .2 seconds Increase distance between the patient and the image intensifier will result in a change in the patient radiation dose as well as magnification of the images, what are the changes specifically? - Correct Answer Increase dose and increase Magnification Where is a cathode ray tube located? - Correct Answer Close circuit TV monitor Give an example of an image recording system that captures and photographs the image from the output phosphor of the Image Intensifier? - Correct Answer Cinefluorography and spot film camera Horizontal resolution on a TV image is determined by what? - Correct Answer Bandpass, the higher the band pass the higher the resolution. In the US how many TV frames are there per second? - Correct Answer 30 . What are rods in the eye responsible for? - Correct Answer night vision Why does pulse progressive fluoroscopy result in lower patient dose compared to conventional image intensified fluoroscopy? - Correct Answer Does not continue to a full dose, The tube is only activated for a percentage of a second. Using a 17/9 duel focus image intensifier, how magnified will the image be in mag mode? - Correct Answer 1.8 (bigger over smaller) Which medical flat panel digital display device will produce an image with higher resolution, 1 megapixel or 5 megapixels - Correct Answer 5 When recording a fluoroscopy exam using a recording device such as cinefluoroscopy, what is the entrance skin dose limit? - Correct Answer Unlimited Using a duel focus image intensifier of 9/6 how much higher is patient dose using mag mode opposed to normal mode? - Correct Answer 2.25 (bigger over smaller and square them) then divide Name 3 ways that a fluoroscopist can minimize dose to the patient? - Correct Answer II closer to the patient, shield, collimation, pulse mode, remove grid for smaller patient, lower rate of pulse progressive What is vignetting? - Correct Answer Loss of brightness in the periphery of an image, brighter in the center, associated with image intensifier fluoroscopy Which fluoroscopy technology involves the direct digitization of the remnant x-rays exiting the patient body? - Correct Answer Digital or flat panel fluoro? What is the ESD for fluoro system used in boost mode? - Correct Answer 20R What is the function of the photocathode in the Image intensifier? - Correct Answer Struck by light and emits electrons What effect on image quality does manipulating the window level have? - Correct Answer Brightness, (the midpoint of the gray scale that is displayed) What component of a fluoro system does a charge couple device replace? - Correct Answer TV camera tube During non digital fluoroscopy at what MA range does the tube typically operate at? - Correct Answer 1-5 MA What does DICOM stand for and what does it do? - Correct Answer Digital imaging communication in Medicine (enables systems from different manufactures to communicate) How often should lead shielding be examined under to fluoro to assure patient and operator safety? - Correct Answer Annually What causes pin cushion distortion? - Correct Answer Shape distortion at the periphery, and true shape at the center of the image on the monitor caused by difference in size of the input phosphor and output phosphor What are cones in the eye responsible for? - Correct Answer Day light vision During fluoro exams a protective curtain or drape must be present and positioned between the patient and fluoroscopist, thickness of curtain must be at least - Correct Answer .25 What is boost mode used for? - Correct Answer To see good detail on very small vessels Which fluoroscopy technology represents the most up to date imaging system? - Correct Answer Flat panel (both detector and monitor) What is scotopic vision? - Correct Answer Night vision What is the minification gain for a 20cm image intensifier with a 2.5cm output phosphor? - Correct Answer 64 (input phosphor diameter squared over output phosphor diameter squared) What effect on image quality does manipulating the window width on image display device have? - Correct Answer Contrast