Question 1

The Straton X-ray tube was designed by Toshiba Medical Systems.

Accepted Answer

A) True 
 B)False  False

Question 2

Which of the following is classified as a high-speed CT scanner?

Accepted Answer

A)  Third-generation scanner 
B)  Fourth-generation scanner 
C)  Spiral/helical CT scanner 
D)  Fifth-generation CT scanner 
A)  Third-generation scanner 
B)  Fourth-generation scanner 
C)  Spiral/helical CT scanner 
D)  Fifth-generation CT scanner D

Question 3

Afterglow refers to the persistence of the image even after the radiation has been turned off.

Accepted Answer

A) True 
 B)False  True

Question 4

A single ray in computed tomography (CT) is:

Accepted Answer

A)  a beam of X-rays emanating from the X-ray tube. 
B)  a single straight line path of an X-ray beam. 
C)  the total attenuation as measured by the detector. 
D)  a collection of beams gathered by the detector. 
A)  a beam of X-rays emanating from the X-ray tube. 
B)  a single straight line path of an X-ray beam. 
C)  the total attenuation as measured by the detector. 
D)  a collection of beams gathered by the detector.

Question 5

Which generation of scanners, also called dual-source CT scanners, consists of two X-ray tubes and two sets of detectors?

Accepted Answer

A)  Third generation 
B)  Fourth generation 
C)  Fifth generation 
D)  Sixth generation 
A)  Third generation 
B)  Fourth generation 
C)  Fifth generation 
D)  Sixth generation

Question 6

Contactless slip-ring design uses a conductive wire as its sliding contact.

Accepted Answer

A) True 
 B)False

Question 7

Please match the following data acquisition concepts. All answer selections will be used just once.

-Filtration

Accepted Answer

A) Data acquisition system 
B) Flashes of light 
C) Beam hardening 
D) Xenon gas 
E) Slice thickness
F)Photodiode
G)Continuous gantry rotation 
A) Data acquisition system 
B) Flashes of light 
C) Beam hardening 
D) Xenon gas 
E) Slice thickness
F)Photodiode
G)Continuous gantry rotation

Question 8

High-frequency generators use a low-frequency inverter circuit to convert the low-voltage current from the main power supply to the high-voltage current required by the CT X-ray tube.

Accepted Answer

A) True 
 B)False

Question 9

The data acquisition system (DAS) performs each of the following functions except:

Accepted Answer

A)  measures the transmitted radiation beam. 
B)  encodes these measurements into binary data. 
C)  powers the rotating components of the gantry. 
D)  transmits the binary data to the computer. 
A)  measures the transmitted radiation beam. 
B)  encodes these measurements into binary data. 
C)  powers the rotating components of the gantry. 
D)  transmits the binary data to the computer.

Question 10

Please match the following data acquisition concepts. All answer selections will be used just once.

-Detector electronics

Accepted Answer

A) Data acquisition system 
B) Flashes of light 
C) Beam hardening 
D) Xenon gas 
E) Slice thickness
F)Photodiode
G)Continuous gantry rotation 
A) Data acquisition system 
B) Flashes of light 
C) Beam hardening 
D) Xenon gas 
E) Slice thickness
F)Photodiode
G)Continuous gantry rotation

Question 11

Which of the following refers to the ability of the CT detector to capture, absorb, and convert X-ray photons into electrical energy?

Accepted Answer

A)  Efficiency 
B)  Stability 
C)  Response time 
D)  Dynamic range 
A)  Efficiency 
B)  Stability 
C)  Response time 
D)  Dynamic range

Question 12

Adaptive section collimation is a design to overcome overscanning, an issue of exposing the patient outside the imaged range which occurs for spiral CT with multirow detectors at the start and the end of the scan.

Accepted Answer

A) True 
 B)False

Question 13

Compared with conventional CT scanners, slip-ring scanners offer all of the following advantages except:

Accepted Answer

A)  removal of cable wraparound. 
B)  elimination of start-stop action. 
C)  capacity for interrupted acquisition protocols. 
D)  minimal interscan delays. 
A)  removal of cable wraparound. 
B)  elimination of start-stop action. 
C)  capacity for interrupted acquisition protocols. 
D)  minimal interscan delays.

Question 14

Which of the following methods does not affect sampling information?

Accepted Answer

A)  Closely packed detectors 
B)  Milliamperage-seconds (mAs) 
C)  Slice thickness 
D)  Double-dynamic focus 
A)  Closely packed detectors 
B)  Milliamperage-seconds (mAs) 
C)  Slice thickness 
D)  Double-dynamic focus

Question 15

Scintillation detectors convert X-ray photons to light and subsequently to electrical signals.

Accepted Answer

A) True 
 B)False

Question 16

The overall goal of the electron-beam CT (EBCT) scanner is to produce low-resolution images of moving organs that are free of artifacts caused by motion.

Accepted Answer

A) True 
 B)False

Question 17

The slice thickness in CT is determined by the:

Accepted Answer

A)  focal spot. 
B)  anode. 
C)  collimator height. 
D)  collimator width. 
A)  focal spot. 
B)  anode. 
C)  collimator height. 
D)  collimator width.

Question 18

A view in CT is:

Accepted Answer

A)  a specific way in which the patient is positioned with respect to the detectors. 
B)  the total attenuation as measured by the detector. 
C)  a collection of rays for one translation across the object. 
D)  a single straight line path of an X-ray beam. 
A)  a specific way in which the patient is positioned with respect to the detectors. 
B)  the total attenuation as measured by the detector. 
C)  a collection of rays for one translation across the object. 
D)  a single straight line path of an X-ray beam.

Question 19

Gas-ionization detectors are prone to afterglow problems.

Accepted Answer

A) True 
 B)False

Question 20

In one type of fourth-generation CT scanner, the tilting action of the detector ring is referred to as:

Accepted Answer

A)  slip-ring technology. 
B)  nutating. 
C)  spiral scanning. 
D)  helical scanning. 
A)  slip-ring technology. 
B)  nutating. 
C)  spiral scanning. 
D)  helical scanning.

The Straton X-ray tube was designed by Toshiba Medical Systems.

Which of the following is classified as a high-speed CT scanner?

Afterglow refers to the persistence of the image even after the radiation has been turned off.

A single ray in computed tomography (CT) is:

Which generation of scanners, also called dual-source CT scanners, consists of two X-ray tubes and two sets of detectors?

Contactless slip-ring design uses a conductive wire as its sliding contact.

Please match the following data acquisition concepts. All answer selections will be used just once. -Filtration

High-frequency generators use a low-frequency inverter circuit to convert the low-voltage current from the main power supply to the high-voltage current required by the CT X-ray tube.

The data acquisition system (DAS) performs each of the following functions except:

Please match the following data acquisition concepts. All answer selections will be used just once. -Detector electronics

Which of the following refers to the ability of the CT detector to capture, absorb, and convert X-ray photons into electrical energy?

Adaptive section collimation is a design to overcome overscanning, an issue of exposing the patient outside the imaged range which occurs for spiral CT with multirow detectors at the start and the end of the scan.

Compared with conventional CT scanners, slip-ring scanners offer all of the following advantages except:

Which of the following methods does not affect sampling information?

Scintillation detectors convert X-ray photons to light and subsequently to electrical signals.

The overall goal of the electron-beam CT (EBCT) scanner is to produce low-resolution images of moving organs that are free of artifacts caused by motion.

The slice thickness in CT is determined by the:

A view in CT is:

Gas-ionization detectors are prone to afterglow problems.

In one type of fourth-generation CT scanner, the tilting action of the detector ring is referred to as:

Computed Tomography: an Overview

Digital Image Processing

Physical Principles of Computed Tomography

Image Reconstruction

Iterative Reconstruction Basics

Basic Instrumentation

Image Postprocessing and Visualization Tools

Image Quality

Radiation Dose in Computed Tomography

Multislice Computed Tomography: Physical Principles and Instrumentation

Other Technical Applications of Computed Tomography Imaging: Basic Principles

Three-Dimensional Computed Tomography: Basic Concepts

Positron Emission Tomographyct Petct and Single-Photon Emission Computed Tomographyct Spectct Hybrid Scanners

Computed Tomography of the Head, Cerebral Vessels, Neck, and Spine

Computed Tomography of the Body

Pediatric Computed Tomography

Quality Control for Computed Tomography Scanners

Filters

Exam 4: Data Acquisition Concepts

The Straton X-ray tube was designed by Toshiba Medical Systems.

Which of the following is classified as a high-speed CT scanner?

Afterglow refers to the persistence of the image even after the radiation has been turned off.

A single ray in computed tomography (CT) is:

Which generation of scanners, also called dual-source CT scanners, consists of two X-ray tubes and two sets of detectors?

Contactless slip-ring design uses a conductive wire as its sliding contact.

Please match the following data acquisition concepts. All answer selections will be used just once. -Filtration

High-frequency generators use a low-frequency inverter circuit to convert the low-voltage current from the main power supply to the high-voltage current required by the CT X-ray tube.

The data acquisition system (DAS) performs each of the following functions except:

Please match the following data acquisition concepts. All answer selections will be used just once. -Detector electronics

Which of the following refers to the ability of the CT detector to capture, absorb, and convert X-ray photons into electrical energy?

Adaptive section collimation is a design to overcome overscanning, an issue of exposing the patient outside the imaged range which occurs for spiral CT with multirow detectors at the start and the end of the scan.

Compared with conventional CT scanners, slip-ring scanners offer all of the following advantages except:

Which of the following methods does not affect sampling information?

Scintillation detectors convert X-ray photons to light and subsequently to electrical signals.

The overall goal of the electron-beam CT (EBCT) scanner is to produce low-resolution images of moving organs that are free of artifacts caused by motion.

The slice thickness in CT is determined by the:

A view in CT is:

Gas-ionization detectors are prone to afterglow problems.

In one type of fourth-generation CT scanner, the tilting action of the detector ring is referred to as:

Computed Tomography: an Overview

Digital Image Processing

Physical Principles of Computed Tomography

Image Reconstruction

Iterative Reconstruction Basics

Basic Instrumentation

Image Postprocessing and Visualization Tools

Image Quality

Radiation Dose in Computed Tomography

Multislice Computed Tomography: Physical Principles and Instrumentation

Other Technical Applications of Computed Tomography Imaging: Basic Principles

Three-Dimensional Computed Tomography: Basic Concepts

Positron Emission Tomographyct Petct and Single-Photon Emission Computed Tomographyct Spectct Hybrid Scanners

Computed Tomography of the Head, Cerebral Vessels, Neck, and Spine

Computed Tomography of the Body

Pediatric Computed Tomography

Quality Control for Computed Tomography Scanners

Filters