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podiatric
KPMA flash cards etc
| Question | Answer |
|---|---|
| removes soft radiation/decreases amt of radiation absorbed by skin | filtration |
| device tightens the useful beam | collimation device |
| automatic collimator allows the operator to use a film holder larger or smaller than the radiation field | larger |
| what happens when an improperly collimated x-ray beam is used | results in extra scatter radiation |
| What is the principle purpose of the colluminator? | to restrict useful xray beam to the body part being examined |
| High RECORDED DETAIL is what | xray with sharp image and well defined detail |
| Subject contrast is | light and dark tones on an x-ray |
| Subject contrast is largly dependant on what 3 things? | wavelength density thickness |
| The ultimate x-ray image is affected by : | kVp, mA, distance and time |
| penetrating ability of xray | kVp |
| increasing kVp setting causes a _________ amount of scatter radiation to reach the film | higher |
| higher kVp setting can affect the image how | may result in poor image quality |
| What controls the quanity of the xray beam and primarily controls radiographic density? | MA |
| True or false Image clarity is not dependant upon tube-to-orthoposer distance. | true |
| t/f Lead must be worn by all persons receiving a foot or leg xray regardles of age. | true |
| t/f The MPD is no less than 5 REM a year | false |
| another name for film badge | dosimeter |
| what is the assistants professional responsibility with regard to taking x-rays? | knowledge of machine and technique offering the least exposure |
| t/f A higher kVp and a lower mA will reduce the patients radiation exposure. | true |
| ALARA principle of radiation exposure stands for what | as low as reasonablly achievable |
| How do the patient and the x-ray operator recieve unnecessary repeat x-ray exposure? | technical error / carelessness |
| Whant is the % of x-ray over-utilization rate due to poor technique,poorly enforced laws and lack of avialable lead aprons? | 90% |
| What is the best way to aviod mistakes when taking an x-ray? | develope a routine and good x-ray technique |
| When making an x-ray exposure you ________ ____ stand in the primary beam | would not |
| t/f Exposure time afffects the quality of the x-ray beam. | true |
| What is the purpose of using a monitoring device? | To make sure occupational exposure does not exceed the MPD |
| another name for secondary radiation. | scatter or leakage radiation |
| How can you reduce the amt of scatter radiation reaching film? | you would reduce the area being exposed to the primary beam |
| What gait position are the feet in when taking angle and base of gait studies? | normal gait position |
| best wiew to visualize the articulation of the sesamiod bones with plantar aspect of the 1st met head is | axial |
| When you take an oblique x-ray of the foot, the foot should form an angle of _____ degrees | 30 |
| When taking a DP (or AP) projection of the foot, the central x-ray should be directed at the proximal end of the 3rd WHAT? | metatarsal |
| What is the x-ray property that causes damage to the human body? | ionization |
| t/f X-rays have higher-energy photons and shorter wave lengths | true |
| What is the wattage for a darkroom safelight | 10-15 |
| t/f A safelight is a basic radiation protection measure for operator. | false |
| To maintain strength and volume of developer, __________ should be added periodiclly. | replenisher |
| What is the function of the fixer on the manifest image? | makes it permanent |
| Another name for cathode | negative pole |
| t/f cathode does not reduce the amt of unecessary primary radiation entering the patient. | true |
| anode | positive electrode pole |
| Where is the focal spot located? | anode |
| Which is correct 1% or 10% of produced x-rays that actually pass thru the portal. | 1% |
| What absorbs the vast majority of the radiation produced in the x-ray tube | the lead housing surrounding the tube |
| Another term for x-rays that are permitted to leave the tube aka ______________ beam. | primary |
| term for center of primary beam aka | central x-ray |
| The useful x-ray beam is known as ________ radiation. | remnant |
| t/f The focal spot size affects the amount of radiation exposure to the patient | false |
| _________ radiation is the primary photons that pass thru the object being x-rayed and reach the film. | remnant |
| t/f primary radiation is the the photons directed toward the object | true |
| If the mA is reduced by 20% and the kVp is held constant the output of the x-rays are: decreased or increased | decreased |
| Cells that have the highest reproductive rate are _______ radiosensative | highly |
| t/f The average photon energy of the x-ray beam influences the absorbtion of radiation in the body tissues. | true |
| the body tissue structure most sensative to effects of radiation are the ________ | gonad |
| ________ Changes in the body caused by radiation exposure, include life span shortening,cataracts, and leukemia | somatic |
| dense objects absorb more or less x-rays | more |
| The developed film is to dark. You should do what? | decrease time, mA, or kVp |
| Patient motion during x-ray results in a ________ x-ray | blurred |
| t/f to minimize distortion in an x-ray you increase the distance between the film and the object | false |
| Correction for an overexposed film decrease the ___ or ___ for the repeat x-ray | mA kVp |
| In good x-ray technique, limit the size of the useful x-ray beam to the dimensions of the ________ _______ _____ | part being examined |
| Where does ionizing radiation come from _______rays and radioactive materials in the earth and water | cosmic |
| Ionizing radiation from cosmic rays, and radioactive materials in the earth and water aka ______________ radiation | background radiation |
| the converion of atoms to electrically charged particles describes __________ __________ | ionizing radiation |
| t/f food and drink do not represent a source of man-made radiation | true |
| What does the term latent image refer to | underdeveloped image |
| radiographic image refers to | developed film or visable image |
| orthoposer is | positioning platform |
| What is a mork on x-rays that is foriegn | artifact |
| if the artifact on fil is caused by the automatic processor you would or would not replace the auto film processor to improve the quality of the next x-ray | would not |
| lead is an example of what type material ( x-rays can not penetrate it) | radiopaque |
| xray laws governing our profession are made by individual (choose one state,practice,doctor,or medical assistant)laws | state |
| t/f subject contrast is dependant on wavelength, density and thickness | true |
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