Into to CT Test 1 Flashcards Preview

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Flashcards in Into to CT Test 1 Deck (18)
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0
Q
What did Johann Radon do?
A
Published a mathematical proof in 1917(at this time had no application)that is now the basis for CT construction.
Wanted to know what the space was in between two pieces
1
Q
What did Allan Cormack do?
A
Left his computer for the weekend then came back and collected data recorded by the computer. This was the first Scan data.

2
Q
What did Godfrey Hounsfield?
A
He was backed by EMI and developed the first CT scanner in 1972.
The Father of CT
3
Q
Which individuals were awarded the Nobel Prize for their contribution in medicine for the CT scanner? And in what year did this contribution occur?
A
Cormack and Hounsfield in 1979
4
Q
1st Generation Characteristics
A
• Pencil beam (one beam/one tube)
• Only could do heads
• Translate rotate scanner
• Could go 180 degrees but only in 1 degree increments
•Very Slow
5
Q
2nd generation characteristics
A
• Fan beam
• Moved in increments of 10 degrees could only go 180 degrees all together
• Bow tie filter
• Translate Rotate Scanner
• Was more torso capable
6
Q
3rd generation characteristics
A
• Rotate-rotate scanner
• Could go 360 degree around
• X-ray in an arch
• More detectors 250-750
• Scanned faster
• Tube and detectors rotated in unison
• CONS Left a ring artifact and the cord would get wound up
7
Q
4th generation characteristics
A
• Rotate-only scanner
• Eliminated ring artifact
• Stationary Detectors all around the gantry
• PT motion caused major issues
8
Q
​Explain what an Electron Beam CT (EBCT) is:
A
AKA as ultrafast CT. It differs from conventional CT because it uses a large electron gun as its x-ray source. A massive anode is placed in a semicircular ring around the patient. Neither the x-ray beam source or the detectors move. Used for cardiac imaging 5th generation
9
Q
Explain what a Dual Energy Sources CT Scanner is.
A
It has 2 detectors and 2 tubes. It is used for heart imaging. It was introduced by Siemens manufacture.
10
Q
List five CT advancements in Diagnostic Imaging.
A
​1. Multi Row Detector Scanners

​2. Dual Source CT scanner

​3. Volume Scanning- CT fluoroscopy, CT angiography, 3D imaging, virtual reality imaging

​4. Radiation Therapy- could be used in treatment planning with the stimulation process

​5. Nuclear medicine- the CT scanner can be combined with a PET scanner. “SPECT”
ETC—Mobile Scanning, air port security, paleontology, livestock, logging, art
11
Q
Slip Ring technology allowed what type of scanning mode possible?
A
Helical scan modes
obtain continuous electrical power source and continual information gained

12
Q
State the importance of increasing the number of detectors for computed tomography images.
A
It improves the diagnostic quality of CT images and reduces the time for helical studies. Also, more detectors allows more information to be obtained. More detectors, more rows= more information
13
Q
Describe the purpose of the “bow tie” filter used in computed tomography.
A
To reduce the beam intensity at the periphery of the beam corresponding to the thinner areas of patient’s anatomy. Also increases the image quality
14
Q
Identify the names CT is commonly referred to by medical personnel.
A
CAT scan, Computer Assisted Tomography. Previously known as Computerized Axial tomography, Computerized Tomography
15
Q
When was the implementation of CT introduced into the United States (Mayo Clinic)?
A
1973... Early 1970s
16
Q
Identify at least three major advantages of Computed Tomography as compared to Conventional Radiography
A
​1. Elimination of superimposed structures
​2.​Gives the ability to differentiate small differences in density of anatomic structures and abnormalities.
​3. Superior quality images, superior contrast resolution
4. Better visualization of fractures.
5. Decreased needed time to produce Images
17
Q
What have you learned about CT from this unit that you didn't know before? Essay.
A
◾️CT use outside of the medical field
◾️the multiple generations of scanners
◾️what year the first ct machine was used in US
◾️who created the CT