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CODA Radiology
| Question | Answer |
|---|---|
| Another term for interproximal radiographs is a. Full-mouth b. Periapicals c. Bite-wings d. Panoramic | c. Bite-wings |
| The most penetrating x-rays have a. Low frequencies b. Soft rays c. Long wavelengths d. Short wavelengths | d. Short wavelengths |
| What landmark on the face is used for a maxillary occlusal film? a. Tragus of the ear to the ala of the nose b. Canthus of the eye to the ala of the nose c. Bridge of the nose d. Tip of the nose | c. Bridge of the nose |
| To eliminate radiation flashback, the operator must remove this from the patient a. Clothing b. Gum c. Above neck jewelry d. Contact lens | c. Above neck jewelry |
| To operate the control switch, how far from the patients location must an operator stand in order to escape the most harmful x-rays? a. 4 feet b. 6 feet c. 10 feet d. 12 feet | b. 6 feet |
| An early warning indicator of x-ray dermatitis is a. Loss of hair b. Nausea c. Reddening of skin d. Feeling of general weakness | c. Reddening of skin |
| The organ or tissue most sensitive to ionizing radiation is a. Dermal tissue b. Reproductive organs c. Bone marrow d. Brain | b. Reproductive organs |
| If a film is not long enough it will be a. Brittle b. White c. Brownish d. Clear | c. Brownish |
| Exposure time for dental x-ray film is influenced by a. Number of gold inlays b. A full complement of teeth c. Diameter of primary ray d. Distance of cone from target | d. Distance of cone from target |
| If mA is increased while the Kvp and the exposure times are kept constant, the resulting films will be a. Lighter b. Darker c. The same d. Herringbone patterned | b. Darker |
| For safety, the operator must not hold the tube when exposing films because a. Film fogging can occur b. Conning can take place c. Electric shock is possible d. The tube does not confine radiation | d. The tube does not confine radiation |
| The most hazardous radiation to the operator is a. Primary b. Secondary c. Scattered d. Leakage | c. Scattered |
| Underexposure of radiographs is suspected when the x-ray is a. Dark b. Blurred c. Light d. Streaked | c. Light |
| The ideal temperature of solutions used in processing dental radiographs is a. 56-60 degrees F b. 62-66 degrees F c. 68-72 degrees F d. 74-78 degrees F | c. 68-72 degrees F |
| X-ray operator protection requires that you a. Avoid primary, secondary, and scattered radiation b. Must stand six feet away from x-ray head c. Never hold film of patient d. All of the above | d. All of the above |
| The purpose of fixing film is to a. Remove the unaffected silver salts b. Remove the affected silver salts c. Soften the film d. Peel the aluminum from the film base | a. Remove the unaffected silver salts |
| Excessively dark radiographs may be caused by a. Overdeveloping b. Excessive kilo-voltage c. Rehearsal of film in placemnt d. Insufficient milliampere seconds | b. Excessive kilo-voltage |
| If the sinus area is shown on a radiograpgh, it indicates that the film is of the a. Maxillary anteriors b. Mandibular molars c. Maxillary molars d. TMJ | c. Maxillary molars |
| Many dentists have recently installed smaller lead diaphragms in their x-rays units to a. Cover all the area b. Avoid static electricity c. Decrease x-radiation d. Avoid cone cutting | c. Decrease x-radiation |
| Regulations to follow for safety of operator shielding are a. to locate dental x-ray unit at the most distant point from heavy traffic flow b. Walls constructed of sheet of lead c. a lead lined shield d. all of the above | d. all of the above |
| When a periapical dental film is placed in the oral cavity, a pebbly surface is a. the position for mounting x-rays b. place next to the tissue or tooth c. perpendicular or horizontal position d. placed away from the radiation positioning device | b. place next to the tissue or tooth |
| When a film shows brown spots it is because a. the temperature is too hot b. there are glass chips in the cone c. the film came into contact with the sides of the tank d. there were air bubbles in the solution | c. the film came into contact with the sides of the tank |
| Exhausted developer will a. produce a thin, faded image b. produce a thin, shiny image c. produce a partial image d. produce a dense image | a. produce a thin, faded image |
| The use of fast film a. will help prevent blurring b. prevent a partial image c. keeps you awake d. prevents a thin image | a. will help prevent blurring |
| Air bubbles clinging to the surface of the film in the developer a. shows up as white blotch b. prevents the developer from reaching the emulsion beneath them c. causes a web like appearance | a. shows up as white blotch |
| Filters are used in the x-ray beam to a. increase contrast b. reduce film density c. reduce exposure time d. remove low energy x-ray photons | d. remove low energy x-ray photons |
| Intensifying screens are used to a. speed processing time b. reduce exposure time c. clarify the bony structure d. increase exposure and achieve better detail | b. reduce exposure time |
| A radiograph with a thin image is difficult to interpret and may be caused by a. inaccurate timer b. too short developing time c. too cold developing solution d. all of the above | d. all of the above |
| Results of careless angulation of the x-ray tube are a. blurred image b. cone cut c. white light fog d. web-like appearance | b. cone cut |
| Overfixation causes a. bleaching of the radiograph to a thin, shiny image b. Emulsion to wash off c. increased image density d. a partial image | a. bleaching of the radiograph to a thin, shiny image |
| Fog always causes a. loss of radio-graphic contrast b. a partial image c. a partial contrast of the image d. film to absorb developer | a. loss of radio-graphic contrast |
| For extra-oral films, you may process under a safe-light to a. 15 watt bulb, 4 feet from working space b. 5 watt bulb, in the dark c. 2 watt bub, 6 feet from working space d. none of the above | a. 15 watt bulb, 4 feet from working space |
| The primary cause of radiation damage is a. direct effect b. genetic damage c. indirect effect d. ionization | d. ionization |
| The most usual cause of light radiographs is a. using low kilovoltage b. over-developing the film c. using an exhausted developer d. placing the shielded side of the film toward the tube | a. using low kilovoltage |
| At 90 kVp, with a target film distance of 8 inches, the exposure time for a film is 1/2 second. Under the same situation the exposure time at 16 inches is a. 4 seconds b. 1 second c. 2 seconds d. 1/2 second | b. 1 second |
| During normal exposure the occlusion plane of the teeth should be in what relation to the floor a. vertical b. parallel c. perpendicular d. at the right angle | b. parallel |
| To accurately determine the temperature of th processing solutions, the thermometer should be located in the a. developer b. wash water c. fixer d. area above the developing tank | a. developer |
| The established yearly whole-body dose limit for individual members of the public exposed for diagnostic purpose or occasionally exposed individuals is _______ the maximum dose for radiation workers a. 1/10 b. 1/2 c. 1/4 d. 10 times | a. 1/10 |
| Exposure time is determined by a. kVp and mA b. vertical angulation c. film size d.horizontal angulation | a. kVp and mA |
| Under-developing can cause the film to be a.dark b. light c. fogged d. blank | b. light |
| Film fog may occur if there is a. extremely thick bone b. bending of the film c. reversal of the film d. a light leak in the dark room | d. a light leak in the dark room |
| Dark films will result in a. under-developing b. over-developing c. under-exposing d. over-exposing | b. over-developing |
| If m A is increased while the kVp and the exposure time are kept constant, the resulting film will a. be lighter b. be darker c. remain the same d. have a herringbone pattern | b. be darker |
| To increase the penetrating quality of an x-ray beam, the dental assistant must a. increase kVp b. decrease kVp c. increase mA d. increase TFD | a. increase kVp |
| The dose of ionizing radiation to which a person in radiation related occupation can be exposed over a given period of time without sustaining appreciable bodily injury as a result of the exposure defines the a. quality factor b. maximum absorbed dose | b. maximum absorbed dose |
| The negative electrode of the x-ray tube is a. filter b. focusing cup c. anode d. cathode | d. cathode |
| What effect will improper rinsing have on x-rays a. elongation b. clear film c. lighter film d. spots on film | d. spots on film |
| The cathode is filament composed of a. tungsten b. silver c. copper d. aluminum | a. tungsten |
| Overlapping is a result of a. incorrect processing b. patient movement c. excessive bending of film d. incorrect horizontal angulation | d. incorrect horizontal angulation |
| After films are removed from the fixer, they are washed for a. 5-10 minutes b. 10-20 minutes c. 30 minutes d. 1 hour | b. 10-20 minutes |
| Protection from the patient provided by the usage of a. lead apron b. lead thyrocervical collar c. closing the eyes d. all of the above | d. all of the above |
| Which of these appear radiolucent a. granuloma b. calculus c. pulp stone d. cementoma | a. granuloma |
| For maximum penetration of x-rays, which of the following combinations would you select a. 90 kVp and 10 mA b. 65 kVp and 10 mA c. 70 kVp and 90 mA d. 10 kVp and 65 mA | a. 90 kVp and 10 mA |
| The amount of radiation a person receives a. begins a new each day b. cumulative only on the skin c. cumulative in the entire body d. not harmful in small doses | c. cumulative in the entire body |
| Foreshortening is a result of a. insufficient vertical angulation b. excessive vertical angulation c. excessive horizontal angulation d. insufficient horizontal angulation | b. excessive vertical angulation |
| During processing, radiographs can safely be exposed to light after a. developing b. fist wash c. fixing d. final wash | c. fixing |
| An indicator of the maxillary arch of a dental periapical radiograph is a. tooth size b. sinuses c. number of teeth d. tooth positioning | b. sinuses |
| A material or substance that does not stop or absorb x-rays is known as a. raiographic b. radiopaque c. radiolucent d. radiodontic | c. radiolucent |
| Blurred films can result from a. old film b. patient movement c. increased kVp d. faulty x-ray unit | b. patient movement |
| A film placed in the mouth with the tab side toward the teeth will show a. a blurred image b. a herringbone pattern c. fogging d. overlapping | b. a herringbone pattern |
| Film speed is determined by the a. amount of silver bromide salt b. thickness of cellulose acetate base c. size of the silver bromide crystal d. side of the film exposed | c. size of the silver bromide crystal |
| This landmark will appear radiolucent on the radiograph a. external oblique ridge b. zygomatic arch c. maxillary tuberosity d. lingual foramen | d. lingual foramen |
| If a patient complains of trismus due to impacted wisdom teeth, the radiograph to select would be a. cephalometric b. panoramic c. periapical d. occlusal | b. panoramic |
| Milliamperage controls a. the speed electrons move from cathode to anode b. cooling of the anode c. heating of the anode d. heating of the cathode | a. the speed electrons move from cathode to anode |
| The ___ unit is used to compare absorbed doses and it indicates the amount of radiation energy transferred by any type of ionizing radiation a. milliroentgens b. roentgens c. rad d. photoelectric effects | c. rad |
| Filters are used in the x-ray housing to a. increase contrast b. reduce density c. remove low energy x-ray photons d. reduce exposure time | c. remove low energy x-ray photons |
| To prevent film fogging, intraoral films should be processed under a red or orange safelight a. 7 watts- 4 feet from working space b. 15 watts- 6 feet from working space c. 15 watts- 8 feet from working space d. 40 watts- at any distance from workin | a. 7 watts- 4 feet from working space |
| Federal regulations stipulate that the primary beam must be ____ at the skin surface a. 2.75 inches minumum b 2.25 inches minumum c 2.75 inches maximum d 2.25 inches maximum | c 2.75 inches maximum |
| When matter is irradiated by x-rays, which type of radiation is produced? a. leakage b. primary c. divergent d. secondary | d. secondary |
| To produce an x-ray with greater penetrating power, one should adjust the a. milliamperage b. kilovoltage c. exposure time d. target object distance | b. kilovoltage |
| If the directions on the film package call for an exposure time of 1/6 second, how many impulses should the operator select a. 3 b. 5 c. 10 d. 12 | c. 10 |
| A panoramic film should be used to a. detect mandibular fractures b. locate impacted teeth c. chart caries d. generally evaluate the mouth | c. chart caries |
| The negative electrode of the x-ray tubehead is the a. aluminum b. coolidge tube c. anode d. cathode | d. cathode |
| Which of the following are true regaurding automatic film processing solutions 1. solution must be replenished at least once a day 2. solution must be replenished once a week 3. solution temperatures are higher than those required for manual processing | a. 1 & 3 |
| After the x-ray machine is turned off, how long do x-rays continue to exist in the room a. 6 seconds b. 6 minutes c. Once time button is released x-rays no longer exist d. it depends on the kVp settings | c. Once time button is released x-rays no longer exist |
Created by:
bushey.kaitlyn