random Flashcards
Increasing the TPD from 12” to 18” on mobile units will reduce the ESE by approximately _____ %.
30 %
A photocell located between the I.I. and the television camera system that is designed to maintain a range of brightness by manipulating exposure factors is a:
abc/abs
Try to avoid ___cassettes and utilize photospot
spot film
_____ Cannot support connection to viewing
recording systems
fiber optic bundles can not
-but lens optic coupling can
this viewing recording system utilizes Tube current typically over 100 mA with short exposure time
Spot film
- therefore has superior resolution when compared to photospot
This viewing/recording device results in patient dose 20-50 times higher than fluoro to obtain images, but 1/3 to ½ lower than spot film cassettes
photo spot
THIS VIEWING/ RECORDING DEVICE RESULTS IN PATIENT EXPOSURE THAT IS SIGNIFICANTLY GREATER THAN WITH OTHER TYPE OF IMAGE RECORDING SYSTEMS
Cinefluorography
I.I. is capable of producing up to ____ lp/mm spatial resolution, the TV monitor of a 525 line system is capable of only ___ lp/mm.
- 5 lp/mm
2. 1-2 lp/mm
An undesirable property of most vidicon tube is ____.
LAG
An undesirable property of most plumbicon tube is not lag but ____.
Quantum mottle
What are the 2 ways to record motion images
- Video tape/ laser disc recording
2. Cinefluorgraphy
Name the 3 types of radiation
- Useful beam
- Leakage radiation
- Scatter radiation
Name the 3 methods that energy is lost .
-Which is the most important at low energies in fluoro?
- Photoelectric effect
- Compton scattering
- Pair production
PE is most important at low energies
dose measured over a period of time
dose rate
SI unit for rad
Gray
