Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
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
AEC
Exposure Final
| Question | Answer |
|---|---|
| What is the purpose of the AEC Device? | Measure exit radiation and automatically terminate the exposure when the needed IR exposure is reached |
| True or False: With AEC all films should have the same density? | True |
| What are the two types of AEC? | Phototimer & Ionization Chamber |
| What is the quantity of radiographic censity for a 200 speed film? | 1mR (1/2 mR for 400 speed) |
| Where is the AEC on the phototimer? | Behind the IR cassette |
| Where is the AEC on the Ionization Chamber? | In front of the IR |
| which AEC is the exit-type device? | Phototimer |
| In AEC exposure time and Radiographic density are determined by what factors? | Positioning of anatomy over AEC cell, plus or minus density settings, collimation & Aec Calibration |
| How can too much collimation affect the AEC exposure? | it can cause the AEC to see the tissue as very dense and overexpose the image |
| How can not collimating enough affect the AEC? | Excessive amounts of scatter can reach the AEC and cause it to end the exposure prematurely(undercutting) |
| What are some factors that affect exposure time but not radiographic density when using an AEC? | Part Thickness,KVP & mA |
| If the center detector is selected for a PA chest with a film IR what will happen? | Optimal density in the area of the spine, but the lungs will be overexposed |
| What is the purpose of a backup timer? | it terminates the exposure when the AEC does not due to malfunction or technologist error |
| What are some clinical situations that might cause the backuo timer to stop the exposure? | Selecting the wrong bucky, backup timer too low, Using AEC for non bucky studies,too low KVP & orthopedic implants |
| what should the backup timer be set at? | 150-200% of anticipated manual technique |
| What happens if the backup timer is less than the needed exposure? | Image will be underexposed |
| What is the maximum AEC exposure allowed? | 600mAs |
| What does MRT stand for? | Minimum Response time |
| What is another name for Minimum Response time? | Minimun Exposure time |
| What is Minimum Response time? | Shortest possible exposure time |
| Can an AEC be used for tabletop or stretcher exams? | If you use the wall bucky or an AEC paddle it can be |
| What is the major cause of exposure error when using AEC? | Selecting the proper detector for the exam you are performing |
| When using AEC and selecting a higher Kvp what will happen to film density? | It will not affect film density but it will shorten the exposure time |
| What happens if the backup timer is set too low? | Image may be underexposed |
| Will the image be underexposed if the needed exposure time is shorter than the MRT? | no |
| What will happen if you use the center detector for a PA or AP chest? | the image will be overexposed |
| If a metal prosthesis or implant devise is placed over the selected AEC detector what will happen to the image? | most likely be overexposed |
| What happens if the needed exposure time is less than the MRT? | Overexposure |
| What can be done if the backup timer periodically or routinely terminates the exposure? | Use higher mA values to shorten exposure time |
Created by:
Sukioshii