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CT > Ct > Flashcards

Ct Flashcards

1
Q

Type of detector

A

Curvilinear

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2
Q

Type of table

A

Scissor table

2 stage

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3
Q

1 st stage of table is

A

Side rails

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4
Q

What is I Link program

A

It’s when you have a problem with scanner, person can remotely troubleshoot scanner.

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5
Q

The cost of the CT scanner is up to —of the expense.

A

1/3

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6
Q

Raw data

A

Has no information in it

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7
Q

Image data

A

RAS, algorithms, DFOV

Only can change window and level

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8
Q

Array Processor

A

Adds all the parameters to Raw data to make image data.

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9
Q

Old Scanner is a

A

Single slice scanner
1 image per revolution
Thickest slice is 10 cm

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10
Q

What was the name of the company that Hounsfield invented CT

A

EMI

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11
Q

What year did hounds field invent CT in the lab

A

1967

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12
Q

What year was first full scan unit made

A

1971

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13
Q

What year was the head scanner in the USA

A

1973

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14
Q

What year was the full body scanner in the USA

A

1974

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15
Q

PDU means

A

Power Distribution Unit

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16
Q

What is the panel on the wall and what does it do

A

PDU
Distributes power to scanner
Console
SCU

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17
Q

What kind of power is distributed to the console? And where is the console

A

Low power

Computer is under the desk

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18
Q

SCU

A

Single Cabinet Unit

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19
Q

What kind of power goes from the PDU to the SCU

A

Low power

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20
Q

What step up power to energize gantry

A

HV transformers

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21
Q

What is a balance check

A

Gantry needs to be balanced every morning, spins very slowly

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22
Q

DAS stands for?

It does?

A

Digital Acquisition System

Receives energy from crystals and figures out what different densities are. Sends signal to SCU and computer.

23
Q

What are three types of detectors

A
  1. Xenon Crypton Gas
  2. Scintillation detectors with crystals cesium iodide in the photomultiplier tubes (photodiode)
  3. Solid-State detectors still use crystals
24
Q

What are your choices of scan field of view collimation in new scanner

A

Small is 32 cm

Large is 50 cm

25
Q

What was the benefit of xenon gas used in detectors

A

Has a low Z number, so it does not change the wavelength of photon passing through.
The different energy wavelengths will be transmitted to the crystals

26
Q

What do baffles do?

A

Absorb long wavelength energy.

27
Q

What are located in the back of the baffles?

A

Crystals

28
Q

What do the crystals do?

A

Receive information from energy from the x-ray photons that passed through the patient.
The crystal change the energy form, and goes to DAS.

29
Q

What are DAS boards?

A

Located on the other side of the detector in old scanners.

The boards send signals to the computer

30
Q

Problem with old scanner due to centrifugal force

A

The DAS boards unseat themselves or died.

This caused ring artifact.

31
Q

Ring artifact has to do with–information

A

Collecting information

32
Q

The type of detector in 3rd generation scanner

A

Solid state detector

Uses crystal

33
Q

What RAS can’t you change retrospectively

A

Superior and Inferior

34
Q

Name of reconstruction after the scan

A

Retrospective

35
Q

Name of scan and reconstruction at the time of scan

A

Prospective

36
Q

2 pre-patient collimator

A

SFOV: right and left

Slice thickness: superior and inferior

37
Q

SFOV collimator opens which way

A

Right and left

38
Q

Can you change SFOV after scan

A

No

39
Q

Name of screen that you set up lines

A

View Edit Screen

40
Q

If you have a case that you may need to see again

A

Save the raw data

41
Q

How long is raw data saved? Where? Why?

A

2 days
Systems disk
Bc it takes so much information on disk

42
Q

Image data is held for

A

Up to 2 weeks

43
Q

Speed of table is determined by

A

Slice thickness

44
Q

If taking a 5mm thick picture then the collimator is open how much

A

5 mm

45
Q

Post patient collimator

A

Z-axis of beam

The apperatures open and close with slice thickness

46
Q

Slick thickness options of new scanner

A

5 mm

  1. 5 mm
  2. 5 mm
  3. 625 mm
47
Q

Retrospectively you can change and not change?

A

Can change space infinity

Can’t change slice thickness

48
Q

The aperture opening is measured from?

A

The center and out.

49
Q

Monthly QA checks?

A
  1. Apertures
50
Q

QA of apertures

A

If they are opening and closing properly

To make sure the slice thickness is correct

51
Q

Advantage of new scanner

A
  1. Multi-detector saves dose
52
Q

Detector coverage/scan widest coverage

A

40 mm

53
Q

3 options for detector coverage

A
  1. Individual slice
  2. 20 mm scan/ detector coverage
  3. 40 mm scan / detector coverage

CT (9 decks)

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