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Limited Rad Cht 8
| Question | Answer |
|---|---|
| What should a radiograph image have? | Density, Constrast, Good recorded detail |
| What are the properties of an Image? | Density, Contrast |
| What are the photographic properties of an Image? | Recorded Detail, Distortion, Magnification |
| What techniques are responsible for a radiographic Image? | mAs, Time, KVP, SID |
| What can influence the production of an image? | Tube Aligment, OFD, Thickness of tissue, Collimation, Beam Filters, Fog |
| What are major for a radiographic Image? | Density & Constrast |
| What is Density? | The Blackness of an image |
| What controls Density? | mAs |
| What can be proportional to Density? | Amt of mA used for exposure |
| As more production in tube + More radiation? | More Bk density in the film |
| Density is directly proportional to? | mA & Time |
| If mA 2x? | Qty 2x |
| What can affect film darkening? | mA & mAs |
| What is mAs? | mA x Time = mAs |
| What are the 4 rules of mAs? | mAs = Qty of radiationmAs = Qty of dosage2X Time + 2X mAs = Same effect (has)mA x Time is constant (same) |
| What is the Reciprocity Law? | Used to determine Density Any combination of mA x Time that = same amount of Density |
| What is best for Reciprocity Law? | Always go for fast time & avoid motion |
| What can control mAs? | Focal Size Spot Time |
| What controls a recorded detail? | Focal Spot |
| What size of Focal is best for a good image? | SFS: Sharp Image, Good Anatomy |
| A disadvantage for a SFS? | Can't tolerate heat w/long time |
| What can change a direct effect on Density? | KVP, SID, Heel Effect, Film Processing, Fog |
| What does KVP control? | Contrast & Density |
| 2 ways that KVP affect Density | ^ KVP = ^ penetration^ KVP = ++ radiation energy |
| KVP ^ + ^ radiation energy = ? | more scatter, ^ Density |
| What is The Inverse2 Law? | The Intensity of radiation has a relationship w/ the sq2 of the distance |
| What is the Inverse2 Law used for? | Density, Radiation Intensity, Rad Dosage |
| Summary of the Inverse2 Law | SID ^ 4X greaterA relationship w/ SIDA new mAs |
| What is required for a change in SID? | New mAs to get some amt of Density on r. graph |
| What is Heel Effect? | The tube's target (anode) |
| What is film fog? | unwanted density |
| What is the cause of film fog? | Old Film, light, scatter |
| What are artifacts? | Foreign marks in film |
| Artifacts can effect the ^ v of? | Density |
| 3 Types of contrast? | Radiographic, subject, film |
| What is radiographic contrast? | Bk-silver in film (controlled by KVP) |
| Contrast can? | Enhance info |
| A blacker image has? | Less radiation |
| A whitere image has? | More radiation |
| Which image will have more Density? | An image that is whiter |
| Radiation of a ^ energy? | Has short waves, produces a long scale |
| What is short scale? | Image w/ gray scales |
| What is long scale? | Image w/ bk-wht scales |
| What influences a rad image? | Subject contrast & film contrast |
| What is subject contrast? | Diff between skin @ bones of anatomical part |
| Aerial Image? | Radiation enters- exits the body |
| Film Contrast? | Type of Film |
| What can screens do? | Converts rad energy to visible light, ^ contrast |
| 15% rule? | #KVP x +0.15% #KVP x - 0.15% |
| What is the purpose of 15% rule? | 2X KVP penetration v contrast |
| By v 15% rule in KVP | v mAs by 1/2 |
| Image underexposed? | Lacks density, Add mAs |
| Underexposed, can you add more KVP? | No, will add more scatter |
| What 2 factors are used for film contrast? | mAs(density) + KVP (contrast) to be complimentary |
| mAs & contrast? | Controls radiation, KVP controls constant |
| Too much mAs? | ^ Density |
| A change in distance? | Change in scatter |
| Will distance affect constrast? | No change |
| What influences Density & Constrast? | Beam restriction, Beam filtration, Skin compression |
| Beam restriction? | v scatter |
| Beam filtration? | Gets rid of v energy |
| Skin compression? | v contrast (due to KVP), ^ density |
| What helps the shape of an image? | FSS, SID, OFD |
| What is Penumbra? | Geometric blur |
| Focal Size Spot | Produces a better recorded detail |
| An ^ in SID | v magnification size & distortion |
| What doesnt effect SID? | KVP & Constrast |
| The greater the SID | The v the geometric blur |
| Best advice for OID? | place part as close to the cassette |
| v OID | v Magnification & size distortion |
| What is distortion? | Change in size & shape |
| What is magnification? | Foreshortening & Elongation |
Created by:
jivedoll
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