Geometry of Image Formation Flashcards
The distance from the point of origin of an X-Ray to the surface of the film is termed:
A. Focus to Film Distance
B. Source to Image Distance
C. Target of Film Distance
D. All of the above
D. All of the above
Which of the following does NOT belong in the series?
A. Definition
B. Pneumbra
C. Sharpness
D. Umbra
B. Pneumbra
What is pneumbra?
Fuzzy image on fim
A large focal spot means?
Open columniation
A small focal spot means?
Smaller columniation
The sharpness of detail in a radiograph is NOT affected by:
Milliamperage
What is the measurement of power produced to initiate an X-Ray?
Milliamperage
When proper radiographic detail cannot be obtained due to excessive part film distance, such as when a patient has a cast on, what change in technique may be used to improve the detail?
Increase the FFD
As the screen speed decreases, the image sharpness _____
Increases
The first method to apply to control involuntary patient motion is to:
Manipulate the MA/time relationship
If an X-Ray tube is used with a smaller focal spot, the pneumbra will be:
Decreased
Which of the following studies utilizes a magnification technique to demonstrate small detail?
A. Chest X-Ray
B. Angiography
C. GI study
D. Sinuses
B. Angiography
In order to obtain 2x linear magnification when using a 72” FFD, the OFD should be:
36”
Distortion can be achieved by:
Angling the tube, increasing the OFD, and decreasing the FFD
Which of the following is the best reason for using 72” focal film distance for chest radiography?
A. A larger film size can be used
B. The MAS can be reduced
C. The need for a grid is eliminated
D. The heart shadow is normal size
D. The heart shadow is normal size
