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image aquisition 2

QuestionAnswer
1.Diagnostic xrays are produced within the xray tube? True, pg 431
2.How are diagnostic xrays produced? When high speed electrons are rapidly decelerated upon collision with an anode's tungsten atoms. pg 431
3.What is the source of electrons in the tube? A heated cathode filament will boil off electrons. pg 431
4.How are the majority of images produced in today's world? electronically. pg 297
5. What does APR stand for? Anatomically Programed Radiography. pg 297
6. What are factors that make up image QUALITY? density, contrast (grey scale), recorded detail,and distortion pg 298
7. All geometric factors apply to digital imaging as well as screen/film imaging. True. All OID, SID, focal spot size, distortion, structural position, shape, size, and motion apply to either DR or CR pg 298
8. What does recorded detail mean? Clarity or resolution of anatomic structures present in an xray. pg 298
9. What is distortion? Refers to the misrepresentation of the actual size or shape of an object on an xray. This can be caused by object unsharpness. pg 299
10. What is one line pair? One line pair refers to one line and the one space adjacent to it. pg 299
11. Geometrically recorded detail improves as OID is decreased. true. pg 301
12. Geometric recorded detail improves as SID increases. True, pg 301.
13. What are the two types of shape distortion? foreshortening and elongation. pg 303
14. Elongation occurs when the xray tube is at an angle. True, pg 303
15. Divergent rays affect distortion. True, if an object is placed away from the path of the central beam it is exposed to more divergent ray, resulting in rotation distortion. pg 304
16. When will blur or unsharpness occur? When the edges of a 3 dimensional object do not conform to the shape of the xray beam. pg 304
17. The border of unsharpness around image details is referred to as: focal spot blur, geometric unsharpness, or edge gradient. pg 305
18. The smaller the focal spot size the greater the recorded detail. true, pg 305
19. What is the AFS? The actual focal spot size (AFS) is the area on a tungsten anode that is bombarded by electrons from the filament. pg 305
20. What is the EFS? The effective (projected)focal spot size is the foreshortened size of the focus as it is projected downward toward the IR. pg 305
21. The angle of the anode effects recorded detail? True. pg 305
22. What happens when using a small anode angle? A small anode angle allows for a large AFS, and a small EFS, therefore improving recorded detail. This is good for magnification of small vessels. pg 306
23. Intensifying screens are a component of digital radiography. FALSE! They are only apart of screen/film imaging. pg 310
24. What produces light in intensifying screens? The fluorescent phosphor functions to change xray photons energy into fluorescent light energy. pg 311.
25. A phosphors ability to absorb xray energy and convert it to fluorescent light is referred to as: conversion efficiency pg 312
26. What is phosphorescence? It refers to luminescence from fluorscopic screen phosphors. pg 312
27. 98% of fluorescent light received by film emulsion is emitted from intensifying screen phosphors. true, pg 311
28. Fluorescence terminates at the same time the xray source does. true, it should not continue after exposure is made if it does it is called lag and contributes to overexposure of the image. pg 312
29. Quantum mottle is more likely to occur when using fast screens with low mAs and high KVP. true, pg 313
30. What do high speed screens produce? Poor recorded detail as a result of greater fluorescent light diffusion. pg 313
Created by: maesparza