Question 1

Which CT scanner is based on a fan-beam geometry and complete rotation of the X-ray tube and detectors?

Accepted Answer

A)   First-generation scanner
B)   Second-generation scanner
C)   Third-generation scanner
D)   Fourth-generation scannerE) A) and C)
F) B) and C)

Question 2

Photodiodes are now used in CT scintillation detectors.

Accepted Answer

A) True 
 B)False

Question 3

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

-Semiconductor

Accepted Answer

A)  Data acquisition system
B)  Flashes of light
C)  Beam hardening
D)  Xenon gas
E)  Slice thicknessF) PhotodiodeG) Continuous gantry rotationH) A) and F)
I) B) and D)

Question 4

The total number of data samples per scan or per slice in CT is the:

Accepted Answer

A)   number of data samples per view times the number of views.
B)   number of views.
C)   number of detectors plus the number of data samples per detector.
D)   number of data samples per view plus the number of views.E) B) and D)
F) A) and D)

Question 5

The high-voltage generators of slip-ring scanners are located in the gantry.

Accepted Answer

A) True 
 B)False

Question 6

Which X-ray generator is used in modern CT scanners?

Accepted Answer

A)   Single-phase half-wave rectified
B)   Single-phase full-wave rectified
C)   High-frequency generator
D)   Three-phase, six-pulse generatorE) None of the above
F) A) and B)

Question 7

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

-Slip-ring design

Accepted Answer

A)  Data acquisition system
B)  Flashes of light
C)  Beam hardening
D)  Xenon gas
E)  Slice thicknessF) PhotodiodeG) Continuous gantry rotationH) A) and E)
I) B) and D)

Question 8

What design of collimation is influenced by the size of the focal spot?

Accepted Answer

A)   Prepatient collimation
B)   Postpatient collimation
C)   Predetector collimation
D)   Postdetector collimationE) All of the above
F) None of the above

Question 9

Which scanner is based on slip-ring technology?

Accepted Answer

A)   Third-generation conventional scanner
B)   Fourth-generation conventional scanner
C)   Spiral/helical scanner
D)   Fifth-generation scannerE) All of the above
F) B) and C)

Question 10

Anistrophic is a term used to describe detector channels that are equal in size.

Accepted Answer

A) True 
 B)False

Question 11

The purpose of collimation in CT is each of the following except:

Accepted Answer

A)   create an homogenous beam.
B)   to protect the patient.
C)   to ensure a constant beam width at the detector.
D)   to reduce scatter radiation.E) A) and B)
F) None of the above

Question 12

Which of the following X-ray tubes is most likely used in spiral/helical CT scanners?

Accepted Answer

A)   A tungsten target fixed anode tube
B)   A tungsten target rotating anode tube
C)   A molybdenum target rotating anode tube
D)   A rotating anode tube with a rhenium tungsten diskE) A) and C)
F) All of the above

Question 13

Sixth-generation scanners are referred to as the cine CT scanner because of its high-speed acquisition for imaging the heart and circulation.

Accepted Answer

A) True 
 B)False

Question 14

Which detector characteristic refers to the steadiness of the detector response?

Accepted Answer

A)   Efficiency
B)   Stability
C)   Response time
D)   Dynamic rangeE) A) and B)
F) A) and C)

Question 15

What category of multirow detector array utilizes an isotropic design?

Accepted Answer

A)   Adaptive array detectors
B)   Matrix array detectors
C)   Unilateral array detectors
D)   Identical array detectorsE) All of the above
F) C) and D)

Question 16

Fourth-generation CT scanners are characterized by:

Accepted Answer

A)   rotate-translate motion and parallel beam geometry.
B)   rotate-translate motion and fan-beam geometry.
C)   fan-beam geometry and continuous rotation of X-ray tube and detectors
D)   fan-beam geometry and complete rotation of X-ray tube around a stationary ring of detectorsE) C) and D)
F) B) and C)

Question 17

Which of the following is commonly used in gas-ionization CT detectors?

Accepted Answer

A)   Xenon
B)   Oxygen
C)   Neon
D)   HeliumE) A) and D)
F) C) and D)

Question 18

Which scanner results in a volume of the patient being scanned during a single breath-hold (rather than a single slice of tissue) ?

Accepted Answer

A)   Spiral/helical scanner
B)   Seventh-generation scanner
C)   Second-generation scanner
D)   First-generation scannerE) A) and D)
F) B) and D)

Question 19

The speed with which a CT detector can detect an X-ray event and recover to detect another event is the:

Accepted Answer

A)   response time.
B)   stability.
C)   efficiency.
D)   dynamic range.E) None of the above
F) B) and C)

Question 20

Which of the following refers to the size, shape, motion, and path traced by the X-ray beam as it scans the patient?

Accepted Answer

A)   Beam geometry
B)   Projection profile
C)   Data acquisition
D)   Detector tracingE) B) and C)
F) All of the above

Exam 4: Data Acquisition Concepts

The total number of data samples per scan or per slice in CT is the:

Correct AnswerverifiedShow Answer

The high-voltage generators of slip-ring scanners are located in the gantry.

Correct AnswerverifiedShow Answer

Which of the following refers to the size, shape, motion, and path traced by the X-ray beam as it scans the patient?

Correct AnswerverifiedShow Answer

Which of the following X-ray tubes is most likely used in spiral/helical CT scanners?

Correct AnswerverifiedShow Answer

What design of collimation is influenced by the size of the focal spot?

Correct AnswerverifiedShow Answer

The speed with which a CT detector can detect an X-ray event and recover to detect another event is the:

Correct AnswerverifiedShow Answer

Which detector characteristic refers to the steadiness of the detector response?

Correct AnswerverifiedShow Answer

Which scanner results in a volume of the patient being scanned during a single breath-hold (rather than a single slice of tissue) ?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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Fourth-generation CT scanners are characterized by:

Correct AnswerverifiedShow Answer

Which CT scanner is based on a fan-beam geometry and complete rotation of the X-ray tube and detectors?

Correct AnswerverifiedShow Answer

Which scanner is based on slip-ring technology?

Correct AnswerverifiedShow Answer

Photodiodes are now used in CT scintillation detectors.

Correct AnswerverifiedShow Answer

Which X-ray generator is used in modern CT scanners?

Correct AnswerverifiedShow Answer

Anistrophic is a term used to describe detector channels that are equal in size.

Correct AnswerverifiedShow Answer

Sixth-generation scanners are referred to as the cine CT scanner because of its high-speed acquisition for imaging the heart and circulation.

Correct AnswerverifiedShow Answer

Which of the following is commonly used in gas-ionization CT detectors?

Correct AnswerverifiedShow Answer

What category of multirow detector array utilizes an isotropic design?

Correct AnswerverifiedShow Answer

The purpose of collimation in CT is each of the following except:

Correct AnswerverifiedShow Answer

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