CT scans MCQs Radiology

By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 14, 2024

1. What does CT stand for in CT scans?
A) Computerized Tomography
B) Clinical Technology
C) Computed Targeting
D) Central Tomography

Answer: A) Computerized Tomography


2. What is the primary advantage of CT scans over traditional X-rays?
A) Higher cost
B) Increased image detail and cross-sectional views
C) Longer scan time
D) Lower radiation dose

Answer: B) Increased image detail and cross-sectional views


3. What does the term ‘axial scan’ refer to in CT imaging?
A) Scanning in a straight line
B) Scanning in a circular motion
C) Scanning in cross-sectional slices
D) Scanning only the surface of the body

Answer: C) Scanning in cross-sectional slices


4. What type of contrast agent is commonly used in CT scans to enhance image quality?
A) Iodine-based contrast
B) Barium sulfate
C) Gadolinium
D) Air

Answer: A) Iodine-based contrast


5. What is the purpose of using ‘slice thickness’ in CT imaging?
A) To adjust the resolution of the image
B) To determine the amount of radiation used
C) To enhance image contrast
D) To select the specific area of the body to be scanned

Answer: A) To adjust the resolution of the image


6. In CT imaging, what is ‘windowing’?
A) The process of selecting the type of contrast agent used
B) The technique of adjusting the range of brightness and contrast in the image
C) The time taken to acquire the image
D) The method of aligning the CT scanner

Answer: B) The technique of adjusting the range of brightness and contrast in the image


7. What does ‘multislice CT’ refer to?
A) A single slice imaging technique
B) A CT scanner that acquires multiple slices in one rotation
C) A technique for enhancing image contrast
D) A method of reducing radiation dose

Answer: B) A CT scanner that acquires multiple slices in one rotation


8. What is a common use of CT scans in emergency medicine?
A) To assess bone density
B) To diagnose internal injuries and bleeding
C) To evaluate joint disorders
D) To measure blood flow

Answer: B) To diagnose internal injuries and bleeding


9. How does ‘CT angiography’ differ from standard CT imaging?
A) It uses a higher dose of radiation
B) It provides detailed images of blood vessels using contrast agents
C) It does not require contrast agents
D) It captures static images only

Answer: B) It provides detailed images of blood vessels using contrast agents


10. What does the term ‘CT scan resolution’ refer to?
A) The clarity and detail of the CT images
B) The speed of image acquisition
C) The type of contrast medium used
D) The thickness of the imaging slices

Answer: A) The clarity and detail of the CT images


11. What is the purpose of ‘image reconstruction’ in CT imaging?
A) To create a three-dimensional image from two-dimensional slices
B) To enhance the contrast of the images
C) To reduce the amount of radiation used
D) To adjust the thickness of the imaging slices

Answer: A) To create a three-dimensional image from two-dimensional slices


12. What is a ‘Hounsfield unit’ used for in CT imaging?
A) To measure the speed of image acquisition
B) To quantify the density of tissues in the image
C) To adjust the range of contrast in the image
D) To measure the radiation dose

Answer: B) To quantify the density of tissues in the image


13. What does ‘CT fluoroscopy’ provide that standard CT does not?
A) Static images of internal structures
B) Real-time imaging and guidance for procedures
C) Enhanced image resolution
D) Reduced radiation dose

Answer: B) Real-time imaging and guidance for procedures


14. What is the typical radiation dose of a CT scan compared to a conventional X-ray?
A) Higher
B) Lower
C) The same
D) Variable depending on the scan

Answer: A) Higher


15. What is ‘spatial resolution’ in CT imaging?
A) The ability to distinguish small structures and details in an image
B) The amount of radiation used during the scan
C) The contrast between different tissues
D) The speed of image reconstruction

Answer: A) The ability to distinguish small structures and details in an image


16. In CT imaging, what does ‘dose modulation’ refer to?
A) Adjusting the radiation dose based on the patient’s size and scan area
B) Increasing the contrast of the images
C) Reducing the number of slices in the scan
D) Enhancing the resolution of the images

Answer: A) Adjusting the radiation dose based on the patient’s size and scan area


17. What is a ‘CT scan protocol’?
A) A set of guidelines for patient preparation
B) A specific imaging technique and settings used for different types of scans
C) The process of developing CT images
D) The method for analyzing scan results

Answer: B) A specific imaging technique and settings used for different types of scans


18. What is the role of ‘gated CT’ imaging?
A) To capture images of static structures
B) To synchronize the scan with the patient’s heartbeat for cardiac imaging
C) To enhance image resolution
D) To adjust the radiation dose

Answer: B) To synchronize the scan with the patient’s heartbeat for cardiac imaging


19. What does ‘contrast-enhanced CT’ involve?
A) Using a higher dose of radiation
B) Administering a contrast agent to improve visibility of certain tissues
C) Reducing the thickness of the imaging slices
D) Adjusting the image resolution

Answer: B) Administering a contrast agent to improve visibility of certain tissues


20. What is a common indication for using ‘CT colonography’?
A) To diagnose bone fractures
B) To visualize the colon and detect abnormalities
C) To assess heart conditions
D) To evaluate joint injuries

Answer: B) To visualize the colon and detect abnormalities


21. What does ‘CT scan slice thickness’ impact?
A) The speed of image acquisition
B) The level of detail and resolution in the images
C) The type of contrast agent used
D) The amount of radiation dose

Answer: B) The level of detail and resolution in the images


22. How does ‘multi-detector CT’ (MDCT) differ from single-detector CT?
A) It uses multiple detectors to acquire images more quickly and with higher resolution
B) It requires a higher dose of radiation
C) It provides less detail in the images
D) It is used only for bone imaging

Answer: A) It uses multiple detectors to acquire images more quickly and with higher resolution


23. What is a ‘CT scan artifact’?
A) A feature that enhances image quality
B) An error or distortion in the CT image
C) A type of contrast medium
D) A method of reducing radiation dose

Answer: B) An error or distortion in the CT image


24. What is the main advantage of using ‘helical CT’ scans?
A) Faster image acquisition
B) Lower radiation dose
C) Higher cost
D) Increased image distortion

Answer: A) Faster image acquisition


25. What does ‘post-processing’ in CT imaging involve?
A) Adjusting the scan settings before the scan
B) Enhancing and analyzing the images after acquisition
C) Developing the CT film
D) Preparing the patient for the scan

Answer: B) Enhancing and analyzing the images after acquisition


26. What is ‘CT perfusion imaging’ used to assess?
A) The density of bones
B) Blood flow to organs and tissues
C) The thickness of imaging slices
D) The clarity of static images

Answer: B) Blood flow to organs and tissues


27. What is ‘image stitching’ in CT imaging?
A) Combining multiple CT slices to create a three-dimensional image
B) Adjusting the contrast of the image
C) Enhancing the resolution of individual slices
D) Reducing the radiation dose

Answer: A) Combining multiple CT slices to create a three-dimensional image


28. What is the primary use of ‘CT myelography’?
A) To visualize soft tissues
B) To assess the spinal cord and nerve roots
C) To evaluate blood vessels
D) To measure bone density

Answer: B) To assess the spinal cord and nerve roots


29. What is a ‘CT scan protocol’?
A) A specific technique and settings used for different types of CT scans
B) The guidelines for patient preparation
C) The process of developing CT images
D) The method for analyzing scan results

Answer: A) A specific technique and settings used for different types of CT scans


30. What does ‘CT-guided biopsy’ allow for?
A) Accurate placement of the biopsy needle using CT imaging
B) Enhanced image resolution
C) Reduced radiation dose
D) Increased scan speed

Answer: A) Accurate placement of the biopsy needle using CT imaging


31. What is the purpose of ‘low-dose CT’ protocols?
A) To reduce the radiation exposure to the patient
B) To enhance image resolution
C) To increase scan speed
D) To improve contrast

Answer: A) To reduce the radiation exposure to the patient


32. How does ‘CT imaging’ help in diagnosing tumors?
A) By providing detailed images of the tumor’s size, shape, and location
B) By measuring blood flow
C) By enhancing bone imaging
D) By assessing joint injuries

Answer: A) By providing detailed images of the tumor’s size, shape, and location


33. What is ‘CT scan reconstruction’ used for?
A) To create three-dimensional images from two-dimensional slices
B) To enhance the image contrast
C) To adjust the scan speed
D) To measure the radiation dose

Answer: A) To create three-dimensional images from two-dimensional slices


34. What does ‘artifact reduction’ in CT imaging aim to do?
A) Improve image quality by minimizing errors and distortions
B) Increase the radiation dose
C) Speed up image acquisition
D) Enhance contrast

Answer: A) Improve image quality by minimizing errors and distortions


35. What does ‘CT dose index’ (CTDI) measure?
A) The amount of radiation delivered to the patient
B) The clarity of the CT image
C) The speed of image acquisition
D) The contrast level in the image

Answer: A) The amount of radiation delivered to the patient


36. What is a ‘CT scan localization’?
A) The process of determining the exact area to be imaged
B) The adjustment of image contrast
C) The analysis of scan results
D) The preparation of the patient for the scan

Answer: A) The process of determining the exact area to be imaged


37. What is the purpose of using ‘spiral CT’ technology?
A) To acquire continuous, overlapping images in a spiral pattern
B) To reduce the resolution of the images
C) To increase the amount of radiation used
D) To limit the scan area to a specific region

Answer: A) To acquire continuous, overlapping images in a spiral pattern


38. What does ‘CT image post-processing’ include?
A) Enhancing and analyzing the acquired CT images
B) Setting up the CT scan parameters
C) Administering contrast agents
D) Measuring radiation exposure

Answer: A) Enhancing and analyzing the acquired CT images


39. What is ‘CT scan gating’ used for?
A) To synchronize the scan with the patient’s breathing or heartbeat
B) To adjust image resolution
C) To enhance contrast
D) To reduce the radiation dose

Answer: A) To synchronize the scan with the patient’s breathing or heartbeat


40. What does ‘temporal resolution’ refer to in CT imaging?
A) The ability to capture rapid changes over time
B) The clarity of the image detail
C) The thickness of the imaging slices
D) The amount of contrast used

Answer: A) The ability to capture rapid changes over time


41. What is the purpose of ‘CT scan calibration’?
A) To ensure accuracy and consistency of the imaging equipment
B) To enhance image contrast
C) To increase the resolution of the images
D) To speed up the image acquisition process

Answer: A) To ensure accuracy and consistency of the imaging equipment


42. What does ‘CT scan segmentation’ involve?
A) Dividing the CT image into different regions or structures for analysis
B) Enhancing the contrast of the images
C) Measuring the radiation dose
D) Adjusting the slice thickness

Answer: A) Dividing the CT image into different regions or structures for analysis


43. How does ‘CT scan with intravenous contrast’ improve imaging?
A) It enhances the visibility of blood vessels and certain tissues
B) It reduces the radiation dose
C) It increases the scan speed
D) It adjusts the image resolution

Answer: A) It enhances the visibility of blood vessels and certain tissues


44. What is the role of ‘CT perfusion imaging’ in diagnosing stroke?
A) To evaluate blood flow and identify areas of decreased perfusion
B) To visualize bone fractures
C) To assess joint injuries
D) To measure the density of tissues

Answer: A) To evaluate blood flow and identify areas of decreased perfusion


45. What does ‘CT imaging of the abdomen’ typically assess?
A) The structure and abnormalities of abdominal organs
B) Bone density
C) Joint injuries
D) Blood flow to the extremities

Answer: A) The structure and abnormalities of abdominal organs


46. What is the typical use of ‘CT scan of the chest’?
A) To evaluate lung diseases and chest abnormalities
B) To assess bone fractures
C) To measure blood pressure
D) To visualize joint conditions

Answer: A) To evaluate lung diseases and chest abnormalities


47. What does ‘CT scan with oral contrast’ help to visualize?
A) The gastrointestinal tract and its contents
B) Bone structures
C) Joint injuries
D) Blood vessels

Answer: A) The gastrointestinal tract and its contents


48. What is the benefit of ‘high-resolution CT’ (HRCT)?
A) It provides detailed images of fine structures and small abnormalities
B) It reduces the scan time
C) It uses less radiation
D) It enhances the overall scan speed

Answer: A) It provides detailed images of fine structures and small abnormalities


49. What does ‘CT scan post-processing’ involve?
A) Adjusting and analyzing images after they have been acquired
B) Setting up the scanning parameters
C) Administering contrast agents
D) Measuring the amount of radiation

Answer: A) Adjusting and analyzing images after they have been acquired


50. What does ‘CT dose reduction technology’ aim to achieve?
A) To decrease the amount of radiation the patient receives during the scan
B) To increase the image resolution
C) To speed up the image acquisition
D) To enhance the contrast in images

Answer: A) To decrease the amount of radiation the patient receives during the scan