Radiology Exam Questions All Correct Verified Solutions New Update

Radiology Exam Questions All Correct Verified Solutions New Update Describe the uses of dental imaging - Answer - 1. Detect lesions, diseases & conditions of the teeth 2. Confirm or classify suspected disease 3. Localize lesions or foreign objects 4. Provide info during dental procedures 5. Eval growth & development 6. Illustrate changes secondary to caries, periodontal disease & trauma 7. Document condition of a patient at a specific point and time 8. Aid in the development of a clinical tx plan Describe the discovery of X-radiation - Answer - The First X-ray, 1895. ... At the end of the 19th century, while studying the effects of passing an electrical current through gases at low pressure, German physicist Wilhelm Röntgen accidentally discovered X-rays—highly energetic electromagnetic radiation capable of penetrating most solid objects Who was the first person to make practical use of x-ray in dentistry - Answer - C. Edmund Kells in 1896. What happens during ionization - Answer - When electrons are removed from the orbital shells of electrically stable atoms through collisions with x-ray photons Properties of X-ratiation - Answer - X-ray are a form of energy that can penetrate matter. X-rays belong to a group classified as electromagnetic radiation. Visible light, radar, raddio, and television are waves that are also classufued as electromagnetic radiation. The shorter the wavelength of the x-ray the great is its energy. Bc of their high energy short wavelengths can penertrate matter more easily than longer wavelengths making shorter wavelengths useful Primary components of an x-ray machines - Answer - Tubehead, Extension arm,and the control panel Understand what each part contributes to the production of x-ray - Answer - Position indicator device-this is placed agaist the persons face a extension arm- moves and turns 360 degrees control panel- to operate several tubehead located i seprate rooms What is usually found on the control panel - Answer - master switch, indicator light, selector buttons, exposure button how are x-rays produced - Answer - The current travels from the control panel to teh tubehead through electrical wires in the extension arm the current travels through the step down transformer to the filament of the cathode the filament circuit uses the 3 to 5 volts to heat the tungsten filament in the cathode portion of the x-ray tube after exposure is clicked the elctrons in the cloud are shot across the x-ray tube to the anode the electrons speed fro the cathode to anode the heat is carried away from the coper stem and is absorbed travel through unleaded glass window x-ray beam then travels through the collimator during the production of x-ray how much energy is lost as heat - Answer - 99% lost at heat three types of radiation - Answer - primary radiation-made up of x-rays that come form the target of teh xray tube secondary radiation- created when the primary beam interacts with matter Ex contacts the patient tissues scatter radiation-occurs when an xray beam has been deflected from its path through interaction with matter, travels to all parts of the patient's body and all areas of the dental operaty Identify the kilovoltage range for most dental xrays machines: - Answer - or 70 to90 range for milliamperage required - Answer - C. 7-15 mA Radiolucent and radiopauge - Answer - radiolucent-dark radipauge-light density - Answer - the overall blackness or darkness of a film. n image with the correct density enables the dentist to view black areas Describe how the milliamperage affects the quality of the x-ray beam - Answer - The resulting image will not have the correct overall density or will be light in apperance Describe how the kilovoltage affects the quality of the x-ray beam - Answer - ? What is the name of the time period between x-ray exposure and the appearance of symptoms? - Answer - latent period What is the name of the process that results in the harmful effects of x-rays? - Answer - Ionization what is meant by genetic affects - Answer - passed on to generations sensitive organs to radiology - Answer - thyriod,reproductive,blood forming tissues from scatter radiation Risk vs benifits of x-rays - Answer - risk- its continuing radiation it messes up your reproductive organs benifits- you can see decay or absessed 2 types of radiation measurements - Answer - radiation can be measured ina amanner of time, distance, and weight traditional syste- or standard system metric equivalent system Internationale maximum permissible dose of radiation - Answer - MOD exposed to radiation is 5000 millirem, or 5.0 rems/ year(0.05 sv year purpose of a collimator - Answer - used to restrict the size and shape of the x-ray beam to reduce exposure may have a round or rectangular opening alluminum filter - Answer - purpose is to remove the low-energy long wave length, lleast penetrating x-rays from the beam PID - Answer - Should be small to limit scatter what precautions should be taken when handling the lead apron - Answer - should cover the patient from the neck and extended over tha lap area SHOULD NOT BE FOLDED methods of protecting the patient from excess radiation - Answer - have them wear a lead apron with a tyroid neck color, fast speed film( the faster the film the less the radiation image receptor for holder devices, exposure fraction, parell technique how film speed should be altered - Answer - ? alara conspet - Answer - states all exposure to radiation must be kepy to a minimum *AS LOW AS REASONABLE ACHIEVABLE' Purposes and uses of digital imaging system - Answer - Generate images that can be used in the diagnosis and assessment of dental disease. -Images produced are diagnostically equivalent to film-based imaging and enable radiographer to identify many conditions that may otherwise go undetected, as well as to see conditions that cannot be identified clinically -Allows radiographer to obtain a wealth of information about teeth and supporting structures