#1
What does CT stand for in Computed Tomography?
Computerized Technology
Computed Tomography
Centralized Testing
Clinical Tomography
#2
What is the typical unit for expressing the effective dose of radiation in CT imaging?
Sievert (Sv)
Gray (Gy)
Hounsfield Unit (HU)
Becquerel (Bq)
#3
What role does the gantry play in CT imaging?
Positioning the patient
Producing X-rays
Rotating around the patient
Injecting contrast media
#4
What is the purpose of the collimator in CT imaging?
To shape and limit the X-ray beam
To rotate the X-ray tube
To measure radiation dose
To adjust patient positioning
#5
In CT imaging, what is the function of the X-ray tube?
To generate magnetic fields
To produce sound waves
To emit X-rays
To control patient breathing
#6
Which unit is used to measure radiation dose in CT imaging?
#7
What is the relationship between CT dose and image quality?
Higher dose improves image quality
Lower dose improves image quality
No relationship between dose and image quality
Image quality is not affected by dose
#8
What is the primary purpose of using automatic exposure control (AEC) in CT imaging?
To control patient positioning
To adjust tube voltage
To modulate radiation dose based on patient anatomy
To control contrast media injection
#9
What is the recommended strategy for managing radiation dose in pediatric CT imaging?
Use adult protocols with reduced exposure time
Apply standard adult protocols
Tailor protocols to the patient size and age
Avoid CT imaging in pediatric patients
#10
How does tube current influence radiation dose in CT imaging?
Higher tube current increases dose
Lower tube current increases dose
Tube current has no impact on dose
Tube current affects image resolution only
#11
Which of the following is a method to reduce radiation dose in CT imaging?
Increasing tube current
Using higher pitch values
Decreasing gantry rotation time
Reducing patient shielding
#12
What is the purpose of the CT dose index (CTDI) in radiation dose management?
To measure patient height
To estimate organ dose
To calibrate the X-ray tube
To quantify radiation dose in the scan region
#13
In CT imaging, what does the term 'pitch' refer to?
Gantry rotation time
Table movement per rotation
Tube current modulation
X-ray beam collimation
#14
Which regulatory body sets standards for radiation dose in medical imaging, including CT?
World Health Organization (WHO)
International Atomic Energy Agency (IAEA)
Food and Drug Administration (FDA)
European Medicines Agency (EMA)
#15
Which imaging parameter is primarily responsible for image contrast in CT?
Tube current
Tube voltage
Pitch
Slice thickness