Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

CT Scan With Field Exposure > PART I > Flashcards

PART I Flashcards

1
Q

[year, person] proved it is possible to reconstruct or built up an image of 2D object from a large number of projections from different projections

A

1917
J. Radon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

[year, terms] earlier terms of computer tomography

A

1920
“body section radiography”
“Stratigraphy” - stratum (layer), graphia (to describe)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

[person,year]
redefined the technique and labeled it “tomography”
“Tomos” - section

A

1935
Grossman

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Image of a section of the patient that is oriented parallel to the film

A

Conventional Tomogram

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

[person, year]
developed another technique (cross-sections) referred to as “Transverse Axial Tomography”

A

1937
Watson

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

[person, year] basic idea for today’s tomography, drawings of equipment to for sonograms and optical projection techniques to reconstruct

A

1940
Gabriel Frank

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

[person, year] practical application of projections in medicine, series of experiments on a phantom
[person, year]-studied nuc med

A

1960
William Oldendorf
David E. Kuhl & Roy Q. Edwards

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

[person, year] theory of image reconstruction; applied techniques in nuclear medicine

A

1963
Allan McLead Cormack

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

[person, year] development of first clinical CT scanner at Central Research Laboratories of EMI Ltd. In England

A

1967
Godfrey N. Hounsfield

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

[person, year] consultant of Atkinson-Morley’s Hospital - obtained reading from specimen of human brain with Hounsfield

A

1971
Dr. James Ambrose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

[person, year] developed first whole body CT Scanner, Georgetown University

A

1974
Dr. Robert Ledly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

[year, development] has the goals to carry out dynamic volumes scanning to accommodate imaging the dynamics of organ system with high temporal resolution

A

1975
Dynamic Spatial Reconstructor (DSR)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

[year, person] [..] shared Nobel Prize in medicine and physiology [..]

A

1979 Hounsfield
with Allan McLead Cormack

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

[person, year] introduced External Beam CT (EBCT)

A

1980s
Dr. Douglas Boyd

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Other uses for ct

A
  1. Study of internal log defects in sawmill
  2. Paleoanthropology
  3. Baggage inspection at airports
  4. Oil Exploration
  5. Fat Stock Breeding
  6. Animal Investigation
  7. Evaluate bowed stringed instruments
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

[components]
DESCRIBE Gantry

A

-ring/doughnut shaped
-tilted fwd and bwd (15-30 deg)
-laser light for positioning
-control panel on sides

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Size of aperture

A

70-90cm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

[components]
DESCRIBE Patient Table/ Couch

A

-table to top made of carbon fiber
-should be strong and rigid
-comfort and safety

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Reasons for using carbon fiber in patient table

A
  1. Light weight
  2. Does not attenuate easily
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

[components]
DESCRIBE x-ray system (generator)

A

-uses three-phase flow for the efficient production of x-rays
-high freq. generators now utilized
-located inside gantry
-voltage ripple from high frequency generator is less than 1%

21
Q

Fluctuation of current after it is rectified

A

Voltage ripple

22
Q

[components]
DESCRIBE Slip ring

A

-wires in systemic manner
-x-ray tube rotate continuously
-use a brush like apparatus to provide continuous electrical power and electrical communication across a rotating surface

23
Q

Component of tube enclosure of CT scan (x-ray tube)

A

Metal envelope

24
Q

Consist of tungsten filaments positioned in a focusing cup

A

Cathode assembly

25
-made of barium metal compounds -absorb gas molecules in a vacuum
Internal Getter
26
Components of the anode assembly
Disk rotor stud hub rotor bearing assembly
27
Small target angle of around 12 degrees
Anode
28
Small target effect on Image Formation
1. Increase Spatial Resolution 2. Anode Heel Effect - if angulated too much, less surface area -if smaller-more surface area
29
Reason for high rotational speed 3600 rpm to 10,000 rpm of anode
For heat dissipation-it will hit different parts of the focal spot
30
-uses ceramic insulators - so that envelope will not be affected -uses thicker (5cm) and larger diameter (200mm) anode disk
Anode assembly
31
Types of anode disk
A. All Metal Disk Design B. Brazed Graphite Anode Disk Design C. Chemical Vapor Deposition (CVD) Graphite Anode Disk
32
[base body, focal track] All Metal Disk Design
Base body: Titanium, Zirconium and Molybdenum Focal Track Layer: 10% rhenium & 90% tungsten
33
[adv, disadv] All Metal Disk Design
Adv: quick heat transfer Disadv: weight/heavy
34
[base body, focal track] Brazed Graphite Anode Disk Design
Body base: graphite -10x more heat capacity than tungsten Focal track layer: tungsten-rhenium
35
[adv] Brazed Graphite Anode Disk Design
High heat storage capacity Faster anode cooling
36
[base body, focal track] Chemical Vapor Deposition (CVD) Graphite Anode Disk
Base body: graphite Focal track layer: tungsten-rhenium
37
[adv.] Chemical Vapor Deposition (CVD) Graphite Anode Disk
Can accommodate large heat storage capacity light weight disks
38
Help reduce radiation dose and improve image
Filtration
39
Purposes of filtration
A. Remove long wavelength x-ray B. Shapes the energy distribution across the radiation beam by using shaped filter
40
-Restricts x-ray beam to specific area -control slice thickness
Collimator
41
Collimators present in CT:
A. Prepatient collimator B. Predetector collimator
42
Determining the radiation dose profile and patient radiation dose
Prepatient Collimator
43
Determine the sensitivity profile and improve image contrast
Predetector Collimator
44
Capture the radiation beam from the patient and convert it into electrical signals which are subsequently converted into binary coded information
CT Detector
45
Types of CT detector accdg to Materials
A. Xenon gas detector B. Solid State Crystal (Scintillation Detectors)
46
[adv, disadv] Xenon gas detector
Adv: ability to remain stable under pressure, cheaper, easier to calibrate Disadv: must be kept under pressure in an aluminum casing
47
[adv, compo] Solid State Crystal (Scintillation Detector)
Adv: sensitive to fluctuation in temperature and moisture Composition: cadmium tungstate, bismuth germinate, cesium iodide, gadolinium or yttrium
48
Major Limitation of Radiography
1. Superimposition of anatomical structures 2. Radiography is qualitative rather than quantitative
49
Goals of CT
A. Eliminate/ minimize superimposition B. Improve image contrast C. Recording of very small differences in tissue contrast

CT Scan With Field Exposure (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions