1. Who is responsible for interpreting medical images to diagnose internal body conditions?
(A) Neurologist
(B) Pathologist
(C) Radiologist
(D) Surgeon
2. Which modality provides cross-sectional images using X-rays?
(A) MRI
(B) CT
(C) Ultrasound
(D) PET
3. Which imaging technique uses strong magnetic fields and radio waves to generate images?
(A) CT
(B) MRI
(C) Ultrasound
(D) X-ray
4. Which of the following imaging modalities is most suitable for imaging soft tissues?
(A) CT
(B) MRI
(C) X-ray
(D) PET
5. Which imaging technique uses high-frequency sound waves?
(A) CT
(B) MRI
(C) Ultrasound
(D) X-ray
6. What does CT stand for in medical imaging?
(A) Cross-section Tomography
(B) Computerized Tomography
(C) Computed Transmission
(D) Controlled Tomography
7. What is the typical unit used to measure X-ray attenuation in CT images?
(A) Hertz
(B) Ohms
(C) Hounsfield Units
(D) Decibels
8. Which type of imaging is best suited for brain tumors?
(A) Ultrasound
(B) CT
(C) MRI
(D) PET
9. In medical imaging, what is segmentation used for?
(A) Reducing noise
(B) Colorizing images
(C) Isolating regions of interest
(D) Enhancing contrast
10. Which technique is best for imaging a fetus during pregnancy?
(A) CT
(B) MRI
(C) Ultrasound
(D) PET
11. What does MRI primarily measure?
(A) Electron density
(B) Acoustic impedance
(C) Water molecule behavior
(D) X-ray absorption
12. Which imaging modality involves ionizing radiation?
(A) MRI
(B) Ultrasound
(C) CT
(D) Optical imaging
13. Which is NOT a common use of CT scans?
(A) Bone fracture detection
(B) Lung cancer diagnosis
(C) Brain function measurement
(D) Stroke assessment
14. What does an ultrasound transducer do?
(A) Detects X-rays
(B) Sends and receives sound waves
(C) Creates a magnetic field
(D) Emits gamma rays
15. Which organ is most frequently examined using abdominal ultrasound?
(A) Brain
(B) Heart
(C) Liver
(D) Lung
16. What is a major advantage of ultrasound imaging?
(A) High ionizing radiation
(B) Low cost and real-time imaging
(C) Superior bone contrast
(D) High spatial resolution
17. Which imaging technique is considered safest for repeated use?
(A) MRI
(B) CT
(C) X-ray
(D) Ultrasound
18. What is the primary limitation of MRI?
(A) Poor contrast
(B) Slow imaging speed and cost
(C) High radiation exposure
(D) Low resolution
19. Which MRI component is responsible for the magnetic field?
(A) Gradient coil
(B) RF coil
(C) Magnet
(D) Pulse generator
20. In MRI, what is T1-weighted imaging best used for?
(A) Viewing bone fractures
(B) Measuring blood flow
(C) Anatomical detail
(D) Imaging tumors
21. Which factor affects ultrasound image resolution?
(A) Slice thickness
(B) Pixel depth
(C) Frequency of sound waves
(D) Tube voltage
22. Which term refers to removing noise from medical images?
(A) Denoising
(B) Calibration
(C) Equalization
(D) Rendering
23. Which method is commonly used for brain image segmentation?
(A) K-means clustering
(B) Histogram equalization
(C) Bilateral filtering
(D) Color mapping
24. Which of the following modalities provides 3D anatomical images?
(A) X-ray
(B) CT
(C) Thermography
(D) SPECT
25. In ultrasound, what causes speckle noise?
(A) Magnetic interference
(B) Multiple sound wave reflections
(C) Low voltage
(D) Scanner vibrations
26. What is the function of contrast agents in MRI?
(A) Reduce scan time
(B) Improve signal-to-noise ratio
(C) Enhance image contrast
(D) Remove artifacts
27. Which of the following is NOT typically a post-processing step in medical imaging?
(A) Segmentation
(B) Registration
(C) Acquisition
(D) Classification
28. Which modality is best for visualizing blood vessels?
(A) MRI
(B) Ultrasound
(C) Angiography
(D) CT
29. What does “registration” mean in image analysis?
(A) Image enhancement
(B) Matching images from different modalities
(C) Removing motion artifacts
(D) Reducing noise
30. In medical imaging, what is the purpose of feature extraction?
(A) Reduce image size
(B) Identify key structures
(C) Segment organs
(D) Compress the image
31. What type of images does PET provide?
(A) Anatomical images
(B) Functional images
(C) Static images
(D) Ultrasound images
32. What does DICOM stand for?
(A) Digital Imaging and Communication in Medicine
(B) Digital Interface for CT Output Management
(C) Data Integrity and Compression of Medical Images
(D) Diagnostic Imaging Communication Option Model
33. Which imaging technique is best for detecting tumors with metabolic activity?
(A) MRI
(B) CT
(C) PET
(D) Ultrasound
34. What is the main use of T2-weighted MRI?
(A) Bone imaging
(B) Functional imaging
(C) Detecting edema and fluid
(D) Real-time motion imaging
35. Which term describes aligning images from different scans?
(A) Smoothing
(B) Filtering
(C) Registration
(D) Denoising
36. Which modality is most sensitive to small calcifications?
(A) CT
(B) MRI
(C) PET
(D) Ultrasound
37. Which is an advantage of MRI over CT?
(A) Lower cost
(B) Faster scan time
(C) Better soft tissue contrast
(D) Less sensitivity to motion
38. Which of the following uses radioactive tracers?
(A) CT
(B) MRI
(C) PET
(D) Ultrasound
39. In which modality are Doppler techniques commonly used?
(A) MRI
(B) CT
(C) Ultrasound
(D) PET
40. What is the purpose of 3D reconstruction in CT imaging?
(A) Compress data
(B) Increase noise
(C) Visualize internal structures in volume
(D) Decrease contrast
41. Which method is commonly used for tumor classification in image analysis?
(A) Watershed
(B) Neural networks
(C) Histogram equalization
(D) Bilinear interpolation
42. Which is a major concern with repeated CT scans?
(A) Weak magnetic fields
(B) High cost
(C) Ionizing radiation exposure
(D) Long scan times
43. Which of the following is best for viewing ligaments?
(A) CT
(B) MRI
(C) PET
(D) Thermography
44. What is “intensity normalization” in medical images?
(A) Blurring the image
(B) Adjusting pixel brightness for consistency
(C) Rotating the image
(D) Increasing scan time
45. Which of the following is NOT a typical imaging artifact?
(A) Motion blur
(B) Aliasing
(C) Shadowing
(D) Filtering
46. Which of the following best reduces speckle noise in ultrasound?
(A) Gaussian filter
(B) Median filter
(C) Butterworth filter
(D) Sharpening
47. Which modality is best suited for cardiac imaging?
(A) MRI
(B) X-ray
(C) Ultrasound
(D) PET
48. Which image analysis task detects cancerous tissues?
(A) Filtering
(B) Segmentation
(C) Compression
(D) Inversion
49. Which algorithm is commonly used for detecting edges in medical images?
(A) Fourier transform
(B) Otsu’s method
(C) Canny edge detector
(D) K-means
50. What is a common goal of medical image enhancement?
(A) Increase image file size
(B) Improve visualization of anatomical structures
(C) Add artificial noise
(D) Remove labels
