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Radiology > 11. CBCT > Flashcards

11. CBCT Flashcards

1
Q

4

What is the shape of the x-ray beam for CBCT?

A
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2
Q

4

A CBCT is the only _____ scan enough to acquire a full volume of images

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3
Q

4

What is the scan time for CBCTs?

A
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4
Q

5

Raw CBCT images are slightly offset ____ images.

A
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5
Q

5

Reconstruction algorithms:

Filtered back projection with _____ reconstruction used to produce _____.

A
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6
Q

6

What is the difference between CBCT and MDCT?

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7
Q

7

What are the three components of CBCT?

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8
Q

8

What are the two types of x-ray generation for CBCT?

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9
Q

8

Is continuous or pulse x-ray generation preferred? Why?

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10
Q

8

What factor is used to determine mA and kVp for CBCT?

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11
Q

8

Faster CBCt scans = _____ radiation exposure but ____ noise.

A
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12
Q

8

Slower CBCT scans = ____ basis images = ____ radiation exposure = better images

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13
Q

8

When generating a CBCT, limit the field size to the ______.

A
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14
Q

8

What is the rotation angle range for CBCTs?

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15
Q

8

What is the relationship etween rotation angle, radiation exposure, and noise?

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16
Q

9

What are two ways to detect x-rays?

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17
Q

9

What is the most common x-ray detector for CBCT?

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18
Q

10

What is the smallest element of a digital picture?

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19
Q

10

A pixel is synonymous to a ____ in a detector.

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20
Q

10

Pixels are arranged in rows and columns to form the ____.

A
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21
Q

11

What is the term for a 3D representation of a pixel?

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22
Q

11

What shape is a voxel in CBCT?

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23
Q

11

What term relates to the ability of an image to reveal fine detail?

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24
Q

11

What is the principal determinant of voxel size in a CBCT?

A
25
Q

11

What is the relationship between pixel size and resolution?

A
26
Q

11

What is a disadvantage of having a small pixel/voxel?

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27
Q

12

What is the term for the number of gray shades that can be displayed?

A
28
Q

12

What is the number for the currently available gray shades for CBCT?

A
29
Q

12

What effect does higher bit depth have on computational time and file sizes?

A
30
Q

14

Describe the ideal size of the scan volume or field of view.

A
31
Q

18

How many reformatting steps are done once the CBCT machine is run?

A
32
Q

19

Were is the primary reconstruction of a CBCT done?

A
33
Q

19

Where is the secondary reconstruction done?

A
34
Q

24

What is a ray sum? What are two types of projections it can generate?

A
35
Q

25

What does volume rendering visualization of?

A
36
Q

26

What are inherent artifacts a result of?

A
37
Q

26

What are procedure-related artifacts and what do they lead to?

A
38
Q

26

What produces introduced artifacts?

A
39
Q

26

What kind of artifacts do these three things produce:

-Scatter
-Partial volume averaging
-Cone-beam effect

A
40
Q

26

What artifact do these things produce:

-Aliasing artifact
-Scanner related artifact
-Double contour artifact

A
41
Q

26

What artifact do these result in:

-beam hardening: cupping artifact; extinction or missing artifact
-patient motion

A
42
Q

28

What is a partial volume average inherent artifact?

A
43
Q

30

What is an Aliasing Artifact?

A
44
Q

31

What is a scanner related artifact?

A
45
Q

32

What causes a double contour artifact?

A
46
Q

33

What are beam hardening artifacts?

A
47
Q

33

What are the 2 types of beam hardening artifacts?

A
48
Q

33

What is the beam hardening artifact type where there is distortion of metallic structures as a result of differential absorption?

A
49
Q

33

What is the beam hardening artifact type when dark bands are present between two dense objects?

A
50
Q

36

What are three general applications for CBCT?

A
51
Q

40

Are images distorted in panoramics or CBCTs?

A
52
Q

40

What views are seen in panormaics?

A
53
Q

40

What views are seen in CBCT?

A
54
Q

40

Are structures superimposed in CBCTs and panoramics?

A
55
Q

40

Does CBCT or panoramic have a higher radiation dose?

A
56
Q

41

4 Strengths of CBCTs:

  1. _____ size compared with conventional CT equipment
  2. _____ acquisition
  3. ______ resolution
  4. relatively ____ patient radiation dose
A
57
Q

41

2 Cons of CBCTs:

  1. ______
  2. ______
A

Radiology (13 decks)

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