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Radiology
radiology vocab, homework q & a etc...
| Question | Answer |
|---|---|
| What is a technique chart? | a set of rules for an x-ray machine with the objective of obtaining the same quality at each performance. includes coordination of variables such as kvp,milliamperage etc... |
| What is radiographic density? | The degree of blackness in a radiograph |
| What is subject density?? | The ability of the different tissue densities to absorb x-rays |
| What is radiographic contrast? | differences in radiographic density between adjacent areas on an image |
| What is Radiographic detail | The diagnostic quality when the interfaces between tissues and organs are sharp |
| What is contrast medium? | A substance used to "highlight" an organ. |
| What is positive contrast media? | A substance that contains a higher atomic number, which absorb more x-rays, Thus fewer x-rays penetrate the patient and expose the film |
| What are the 2 types of positive contrast media? | Barium Sulfate and water soluble iodides |
| What is Negative Contrast Media? | things such as air, oxygen, and carbon dioxide which all have a low atomic # thus appearing radiolucent (Black/darker) on a finished radiograph |
| What is scatter radiation? | When an x ray photon strikes an object it can do one of 3 things, pass through it, be absorbed by it, or bounce off of it producing scatter radiation |
| Which way does scatter radiation travel? | it can travel in ANY direction including upward from under the table upward toward your hands |
| What is a double contrast procedure? | A procedure using both positive and negative contrast mediums to image an organ or area |
| What is focal film distance? | The distance measured from the target of the x-ray tube to the radiographic film or plate |
| What is a dosimeter badge? | a device used to measure an absorbed dose of ionizing radiation |
| What is RAD? | Radiation absorbed dosage |
| What is penumbra? | fuzziness of a radiograph due to stray x-rays |
| What is milliamperage (MA) | Controls the amount of radiation generated by the x-ray beam |
| What is mAs? | The time of exposure |
| What is kilovoltage (kvp) | The voltage applied between the cathode and the anode |
| What is fogging?? | Decreased radiographic density due to low grade light leaks, scatter radiation, heat and improper handling |
| What is an oblique view? | usually a 45 degree angle positioning used to set off an area that would normally be super imposed over another area |
| What is VD view? | ventral-Dorsal view, |
| What is DV view? | Dorsal-Ventral view |
| What is Lateral view? | Body area situated away from the median plane or midline |
| What is Dorsal Palmar view? | From the top of the front foot through to the bottom |
| What 4 factors affect the proper scale of radiographic contrast? | 1. Subject density 2. KVP level 3.Film contrast 4. Film fogging |
| Radiographs that show a long scale of contrast show what? | A few black and white shades w/ many shades of gray |
| radiographs that show a short scale of contrast show what? | black and white shades with a few shades of gray |
| Denser tissues such a bone absorb greater or lesser amounts of xray and appear black or whaite on a finished radiograph? | Greater/ White |
| Less dense tissues such as lung tissue absorb greater or lesser amounts of xrays? and appear black or white on finished radiographs? | Lesser/ Black |
| As Kvp increases the scale of contrast gets longer and there is more or less exposure latuitude? | MORE |
| The national council on radiation protection & measurements recommends that the dose for occupationally exposed persons not exceed how much per year? | 5 REM |
| The MPD for non-occupationally exposed persons is what percent less than than theat of a person who is occupationally exposed> | 10% OR A TOTAL OF 0.5 |
| During the entire gestation a fetus should not receive more than how much REM ?? | 0.5 |
| What is REM? | Roentgen Equivalent in man |
| What is SV? | Sieverts |
| What is RAD? | Radiation absorbed dose |
| What is FFD? | Film Focal Distance |
| What is ALARA? | As low as reasonably attainable |
| What is MPD? | Maximum permissible Dose |
| What is OFD? | Object Film Distance |
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Adeprey4311
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