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COMPUTED TOMOGRAPHY > CT - MIDTERM L1 > Flashcards

CT - MIDTERM L1 Flashcards

1
Q

It is responsible for processing and display of program controls

A

Display Console

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2
Q

It is a radiographic technique used for showing true dimensions by moving a
narrow orthogonal beam of x-rays along the length of the structure being
measured.

A

Scanogram

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3
Q

The Scanogram is the ______ image you will see in the CT images

A

First

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4
Q

Scanogram images are also known as ________

A

CT Localizer Radiographs or Surview

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5
Q

Enumerate the three (3) purposes for performing a Scanogram:

A
  1. Plan the Scan
  2. Optimize Radiation
  3. Ensure Correct Anatomy
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6
Q

Scanograms help determine the extent and location of the scan area, ensuring
the target organs or regions are properly imaged.

A

Plan the Scan

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7
Q

Scanogram allows the CT software to adjust the radiation dose and image
quality settings for the main scan

A

Optimize Radiation

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8
Q

Scanogram helps ensure that the CT acquisition covers the correct anatomy

A

Ensure Correct Anatomy

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9
Q

Which other terms are interchangeably used to describe initial CT images (5):

A
  1. Scout
  2. Topogram
  3. Scanogram
  4. Localizer
  5. Surview
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10
Q

This pertains to the localization of the target area

A

Grid Application

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10
Q

It is responsible for a tool used for measurements, outlining area of interest, and placing markers of area

A

Cursor

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11
Q

It is used to pinpoint specific areas of interest on the image, allowing for precise analysis and measurement

A

Cursor

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12
Q

What are the three (3) particular functions of a Cursor:

A
  1. Locating Features
  2. Performing Measurements
  3. Navigating Images
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13
Q

Use the cursor to identify and mark specific structures, lesions, or areas of interest within the CT scan images

A

Locating Features

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14
Q

The cursor can be used to measure distances, areas, or
volumes within the scanned region

A

Performing Measurements

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15
Q

In some cases, the cursor can be used to navigate through different slices or views of the CT scan data

A

Navigating Images

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16
Q

This makes use of HU analyzation by the use of a bar graph

A

Histogram

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17
Q

It is the numeric information contained in each pixel

A

CT Number / Hounsfield Unit

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18
Q

TRUE OR FALSE

CT Numbers may also be collectively identified as the Hounsfield Scale

A

TRUE

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19
Q

The Hounsfield Scale is named after _______

A

Sir Godfrey Hounsfield

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20
Q

The Hounsfield Scale is a ________ scale for describing ________

A
  1. Quantitative
  2. Radiodensity
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21
Q

What are the five (5) parameters of scanning procedure/protocols:

A
  1. Section Interval and Section Thickness
  2. Scan Arc
  3. Exposure Factors
  4. Algorithm
  5. Scan Field Size (FOV/ROI)
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22
Q

This pertains to the thickness of the detector

A

Acquisition Thickness

23
Q

Thickness of the images that we see on the screen

A

Slice Thickness

24
The appropriate image reconstruction slice thickness depends on the _______ being scanned.
Anatomy
25
Larger body sections can be best visualized with ____ slices, smaller subjects should be imaged with _____ slices
Larger = Thicker Slices Smaller = Thinner Slices
26
Thicker Slices correspond to what characteristics (3):
1. Decreased Image Noise 2. Decreased Detail 3. Fewer Slices
27
Thinner Slices correspond to what characteristics (3):
1. Increased Image Noise 2. Increased Detail 3. More Slices
28
It is the distance between scan sections
Section Interval
29
It is the width of the volume of the tissue being examined
Section Thickness
30
Scan arc for the following is equal to: Halfscan = Fullscan = Overscan =
Halfscan = 180 Fullscan = 360 Overscan = >360
30
Most common kVp for CT scanning is ______
120 kVp
30
The following are selectable kVp factors for CT Scan EXCEPT: A. 60 kVp B. 80 kVp C. 120 kVp D. 140 kVp
A. 60 kVp
31
mA from manufacturer's specs in CT ranges from A. 20mA - 50mA B. 30mA-60mA C. 30mA-1000mA D. 20mA-1000mA
C. 30mA-1000mA
31
The two (2) Common CT Image Reconstruction Algorithms are:
1. Filtered Back Projection (FBP) 2. Iterative Reconstruction (IR)
32
A traditional, relatively fast algorithm that uses a convolution filter to reduce blurring in the image but can lead to noise and artifacts, especially at low radiation doses
Filtered Back Projection
33
A more recent approach that uses an iterative process to refine the image, starting with an initial guess and making adjustments based on the measured data.
Iterative Reconstruction
34
This must be set to accomodate the size of the part under examination
Scan Field Size
35
Scan Field Size is also known as _______ or ______
1. Field of View (FOV) 2. Region of Interest (ROI)
36
The Approximate CT Number for Dense Bone is _____
3000 HU
37
The Approximate CT Number for Bone is _____
1000 HU
38
The Approximate CT Number for Liver is _____
40-60 HU
39
The Approximate CT Number for Muscle is _____
50 HU
40
The Approximate CT Number for White Matter is _____
45 HU
41
The Approximate CT Number for Gray Matter is _____
40 HU
42
The Approximate CT Number for Kidney is _____
30 HU
43
The Approximate CT Number for Blood is _____
20 HU
44
The Approximate CT Number for CSF is _____
15 HU
45
The Approximate CT Number for Water is _____
0 H
46
The Approximate CT Number for Fat is _____
-100 HU
47
The Approximate CT Number for Lungs is _____
-200 HU
47
The Approximate CT Number for Air is _____
-1000 HU
48
This pertains to labelling and text adding
Annotation
49
It is the deletion of unwanted parts from reconstructed image
Suppression
50
TRUE OR FALSE Reverse Display may be in the form of Directional Reverse or Negative Reverse
TRUE

COMPUTED TOMOGRAPHY (4 decks)

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