171 test #2 Word Scramble

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Question	Answer
Includes two or three sets of lead shutters, some of which are adjustable:	Collimator
A device consisting of very thin lead strips with Radiolucent interspaces intend to absorb scatter radiation emitted from the patients:	Grid
A larger the x-ray beam field size result in:	Increase in scatter and fog
Decreasing patient thickness while using AEC would result in:	Decreased exposure time
As collimation decreases, exposure the Ir increases: T/F	True
Digital IRs are not sensitive to scatter radiation: T/F	False
What happens to density as SID increases?	Density decreased
Why does the air-gap technique work?	The scatter photons are more likely to miss the image receptor
Significant collimation requires an increase of the mAs
During Operation of the AEC device, the time of exposure:	Inversely related to the intensity in exit radiatiom
What factors are important when using AEC devices?	Detector, centering and back-up mAs
What is the primary goal of exposure technique charts?	Consistency in image quality
What type of exposure technique system uses a fixed mAs regardless of patient thickness?	Variable kVp
Using a higher kVp during an AEC examination results in?	A shorter exposure time
Density represents the different absorption characteristics of the body T/F	True
AEC device work by measuring the:	Radiation that exits the patients
Detectors to select ionization chamber phototimer vs Ionazation chamber:	AEC
Different from AEC anatomic area selection that tech can adjust technique once selected:	(APR) anatomically programmed radiography
Two types of AEC systems:	Phototimer and ionizing chamber
AEC exposure factors for each type of radiographic examination are called:	Exposure technique charts
Advantages of fixed kVp-variable mAs technique chart include:	Easier to use, more consistency and uniform contrast
Adding a grid or increasing grid ratio results in an increase in patient dose: True/false	True
Grids absorb all of the scatter radiation and allow all of the transmitted photons to pass through to the IR: True/false	False
When using automatic collimation, collimating to the anatomy of interest is an unnecessary waste of time; the beam is already collimated: True/False	False
Scatter radiation reaching is of no value in radiographic imaging: True/False	True
Absorption of transmitted photons by a grid caused by misalignment is:	Grid cut off
The recommended SID that can be used with focused grid is the:	Focal range
To compensate for the reduction of radiation reaching the IR when a grid is used,_____is typically increased?	mAs
A focused grid’s strips are angled to match:	The angle of the x-rays in the primary beam
The purpose of automatic collimation is:	Limiting patient exposure
The field shape produced by a collimator is:	Rectangular
The volume of tissue irradiated is determined by:	Area of collimation, patient thickness and field size
The two factors that affect the amount of scatter radiation production produced and exiting the patient are:	Volume of tissue irradiated and kVp
The probability of a Compton interaction occurring is related to:	Energy of the x-ray photon
For radiographic procedures, scatter radiation is primarily the result of:	Compton interaction
The primary source of radiation exposure to the radiographer who is in the room during exposure is:	Scatter from the patient
The effective focal spot is:	Smaller than the actual focal spot
What happen to absorption as kVp increase:	decrease
The shape of the unrestricted primary beam field	Circular(cone shaped)
Radiation transmitted through patient to the AEC occurs:	X-ray exposure terminates
Works by using gas-filled chamber:	Ionization chamber
Use by converting x-ray photons to light then into an electronic signal:	Phototimer
Exposure variable controlled by AEC	Seconds
Using AEC the radiographer adjust to manipulate the subject contrast of the image:	kVp
Purpose of setting a back-up time/mAs:	To prevent excessive exposure of the patient
In order to be familiar with manual technique factors, it is very helpful to pay attention to the:	mAs readout
When using a fixed kVp-variable mAs technique chart, if part thickness increase by 5cm, what needs to happen to the mAs?	It should be doubled

Created by: Faithshay