Ct

Question 1

Type of detector

Answer 1

Curvilinear

Question 2

Type of table

Answer 2

Scissor table

2 stage

Question 3

1 st stage of table is

Answer 3

Side rails

Question 4

What is I Link program

Answer 4

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

Question 5

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

Answer 5

1/3

Question 6

Raw data

Answer 6

Has no information in it

Question 7

Image data

Answer 7

RAS, algorithms, DFOV

Only can change window and level

Question 8

Array Processor

Answer 8

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

Question 9

Old Scanner is a

Answer 9

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

Question 10

What was the name of the company that Hounsfield invented CT

Answer 10

EMI

Question 11

What year did hounds field invent CT in the lab

Answer 11

1967

Question 12

What year was first full scan unit made

Answer 12

1971

Question 13

What year was the head scanner in the USA

Answer 13

1973

Question 14

What year was the full body scanner in the USA

Answer 14

1974

Question 15

PDU means

Answer 15

Power Distribution Unit

Question 16

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

Answer 16

PDU
Distributes power to scanner
Console
SCU

Question 17

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

Answer 17

Low power

Computer is under the desk

Question 18

SCU

Answer 18

Single Cabinet Unit

Question 19

What kind of power goes from the PDU to the SCU

Answer 19

Low power

Question 20

What step up power to energize gantry

Answer 20

HV transformers

Question 21

What is a balance check

Answer 21

Gantry needs to be balanced every morning, spins very slowly

Question 22

DAS stands for?

It does?

Answer 22

Digital Acquisition System

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

Question 23

What are three types of detectors

Answer 23

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

Question 24

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

Answer 24

Small is 32 cm

Large is 50 cm

Question 25

What was the benefit of xenon gas used in detectors

Answer 25

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

Question 26

What do baffles do?

Answer 26

Absorb long wavelength energy.

Question 27

What are located in the back of the baffles?

Answer 27

Crystals

Question 28

What do the crystals do?

Answer 28

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

Question 29

What are DAS boards?

Answer 29

Located on the other side of the detector in old scanners. | The boards send signals to the computer

Question 30

Problem with old scanner due to centrifugal force

Answer 30

The DAS boards unseat themselves or died. | This caused ring artifact.

Question 31

Ring artifact has to do with--information

Answer 31

Collecting information

Question 32

The type of detector in 3rd generation scanner

Answer 32

Solid state detector | Uses crystal

Question 33

What RAS can't you change retrospectively

Answer 33

Superior and Inferior

Question 34

Name of reconstruction after the scan

Answer 34

Retrospective

Question 35

Name of scan and reconstruction at the time of scan

Answer 35

Prospective

Question 36

2 pre-patient collimator

Answer 36

SFOV: right and left | Slice thickness: superior and inferior

Question 37

SFOV collimator opens which way

Answer 37

Right and left

Question 38

Can you change SFOV after scan

Answer 38

No

Question 39

Name of screen that you set up lines

Answer 39

View Edit Screen

Question 40

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

Answer 40

Save the raw data

Question 41

How long is raw data saved? Where? Why?

Answer 41

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

Question 42

Image data is held for

Answer 42

Up to 2 weeks

Question 43

Speed of table is determined by

Answer 43

Slice thickness

Question 44

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

Answer 44

5 mm

Question 45

Post patient collimator

Answer 45

Z-axis of beam | The apperatures open and close with slice thickness

Question 46

Slick thickness options of new scanner

Answer 46

5 mm 2. 5 mm 1. 5 mm 0. 625 mm

Question 47

Retrospectively you can change and not change?

Answer 47

Can change space infinity | Can't change slice thickness

Question 48

The aperture opening is measured from?

Answer 48

The center and out.

Question 49

Monthly QA checks?

Answer 49

1. Apertures

Question 50

QA of apertures

Answer 50

If they are opening and closing properly | To make sure the slice thickness is correct

Question 51

Advantage of new scanner

Answer 51

1. Multi-detector saves dose

Question 52

Detector coverage/scan widest coverage

Answer 52

40 mm

Question 53

3 options for detector coverage

Answer 53

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