PRE 1 Chapter 29 Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
| Question | Answer |
| What is distortion? | The second of two geometric properties affecting radiograph image quality |
| What is the only possible size distortion in radiography? | Magnification |
| What are the two classifications of distortion? | Size or shape distortions |
| True or false can distortion exist even if it can't be seen due to poor visibility? | True |
| Factors that Control distortion with size or what | OID and SID |
| Factors that control distortion with shape or what? | Alignment and angulation |
| What are the reasons distortion would be a factor with alignment? | Central ray part and image receptor |
| What are the reasons distortion would be a factor with angulation | Direction and degree |
| The greater the SID ______ the magnification | greater smaller |
| Distortion is directly related to what? | positioning |
| True or false X-ray photons can be reflected for refracted by ordinary methods? | False, they can only diverge from their point of source |
| SID | Source to image receptor distance |
| OID | Object to image receptor distance |
| Does reduced Magnification size distortion increase or decrease the resolution of recorded detail? | increases |
| What is the magnification factor formula | M= SID ------ SOD |
| what is Fidelity? | – true representation (the sharpness) of the image of the radiographed object |
| Property of geometric factors: | OID SID FSS (focal spot size) Distortion |
| Geometric factors: | Magnification Distortion Focal spot blur |
| A longer SID __________________magnification A shorter SID_________________ magnification | decrease increases |
| OID has significant impact at both | magnification and resolution (detail) |
| what is MF ? | Magnification factor |
| what is the formula for MF? | MF=. Image size ____________ object size |
| will the image size be bigger or smaller than the object? | bigger |
| What is the formula for calculating object size? | OS = image size --------------- MF |
| what are the two factors that affect image magnification? | SID and SOD |
| To minimize magnification Large (long) ________: use as large SID as possible | SID |
| Small (short) OID: place an object as ___________as possible to the IR | close |
| Define Elongation | Projects the object so it appears longer than its actual size. |
| Define Foreshortening | Projects the object so that it appears shorter than its actual size. |
| when does elongation occur ? | This will occur when the CR and image receptor is improperly aligned. Occurs when IR is improperly aligned |
| When does foreshortening occur? | This occurs only when the part is improperly aligned (not parallel to the IR). |
| What happens If object plane and IR plane is not parallel | distortion occurs |
| True or false Thicker objects are less distorted than thinner object | False, they are more distorted |
Created by:
knt5411
Popular Radiology sets