CT REGISTRY LATEST REVIEW WITH COMPLETE SOLUTION COMPLETE AND VERIFIED STUDY MATERIAL

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CT REGISTRY LATEST

REVIEW WITH COMPLETE

SOLUTION COMPLETE

AND VERIFIED STUDY

MATERIAL

Question 1: Xrays are used in CT because:

• they are easily produced by the high frequency generator
• they are less harmful than the heating effects of microwave radiation
• they penetrate the body according to specific attenuation characteristics of each tissue
• the FDA imposes no limit on the dose to the patient

Correct Answer: C

Question 2: Most of the commands from the technologists are received by the:

• array processor
• host computer
• operators console
• gantry

Correct Answer: C) operators console

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Question 3: Xrays are produced whenever fast moving electrons collide with any form of matter

because:

• The electron loses kinetic energy which is converted into the emission of an x-ray photon
• The electron absorbs thermal energy and reflects it as a photon
• The matter converts its potential energy into radiation
• The collision generates an electrical charge within the detector

Correct Answer: A) The electron loses kinetic energy which is converted into the emission of an x-ray photon

Question 4: The mA determines the:

• quality of x-ray photons
• quantity of x-ray photons
• spatial resolution of the image
• speed of the tube rotation

Correct Answer: B) quantity of x-ray photons

Question 5: Which of the following is a component NOT normally located in the gantry of a modern CT system?

• x-ray tube
• slip rings
• array processor
• solid-state detectors

Correct Answer: C) array processor

Question 6: Tube interscan delay time refers to:

• the time required for the patient table to move into position

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• the time between the end of one scan and the start of the next scan during which the tube will

cool

• the time it takes for the array processor to reconstruct the image
• the delay before contrast media is injected

Correct Answer: B) the time between the end of one scan and the start of the next scan during which the tube will cool

Question 7: Increased _______ will increase the likelihood that a given x-ray will penetrate a material.

• kV
• mA
• exposure time
• pitch

Correct Answer: A) kV

Question 8: Which of the following are NOT commonly used on today's commercially available CT scanners? 1. xenon detectors 2. fourth-generation technology 3. continuous rotation technology

• 1 only
• 1 and 2
• 2 and 3
• 1, 2, and 3

Correct Answer: B) 1 and 2

Question 9: Which of the following statements is FALSE regarding occurrences after an x-ray photon penetrates the detector aperture?

• the photon can pass through the detector unmeasured
• the photon is converted completely into an electron

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• the measured signal is enhanced by an amplifier
• the photon can be absorbed by the detector material

Correct Answer: B) the photon is converted completely into an electron

Question 10: Scatter radiation is caused by:

• inadequate cooling of the x-ray tube
• deflections from the original trajectory of an x-ray photon through the patient
• electrical interference in the array processor
• improper calibration of the solid-state detectors

Correct Answer: B) deflections from the original trajectory of an x-ray photon through the patient

Question 11: What control does the operator have over the x-rays in a CT exam?

• the energy level and the quantity of x-rays can be selected
• the speed of the x-ray photons can be altered
• the direction of the scatter radiation can be focused
• the operator has no control over the x-ray production

Correct Answer: A) the energy level and the quantity of x-rays can be selected

Question 12: Which of the following is the standard that's used to achieve compatibility for image transfer between various imaging modalities, viewing stations, and printers in a hospital?

A) PACS

B) RIS

C) DICOM

D) HIS

Correct Answer: C) DICOM