Medical Biophysics – MCQs

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1. The branch of biophysics dealing with the application of physical principles to medicine is called:





2. The unit of X-ray wavelength is typically measured in:





3. CT (Computed Tomography) imaging is based on:





4. MRI works on the principle of:





5. Ultrasound imaging relies on:





6. The Doppler effect in medical ultrasound is used to measure:





7. The unit of ultrasound frequency is:





8. The range of ultrasound frequencies used in medical imaging is:





9. PET (Positron Emission Tomography) imaging uses:





10. The main advantage of MRI over CT is:





11. The typical magnetic field strength in clinical MRI machines is:





12. Radiotherapy for cancer treatment mainly uses:





13. The Bragg peak is an important concept in:





14. Bone densitometry (DEXA) uses:





15. The biological effects of ultrasound are mainly due to:





16. The SI unit of radioactivity is:





17. A common isotope used in nuclear medicine scans is:





18. Gamma cameras are primarily used in:





19. The photoelectric effect in medical imaging contributes to:





20. The Compton effect in diagnostic radiology results in:





21. The SI unit of absorbed dose in radiation therapy is:





22. The SI unit of equivalent radiation dose (biological effect) is:





23. Pulse oximetry works on the principle of:





24. The oxygen saturation measured by pulse oximetry is normally:





25. Endoscopy uses:





26. The basic principle of electrocardiography (ECG) is:





27. Echocardiography uses:





28. The Doppler ultrasound technique can detect:





29. The tracer used in PET scans for studying glucose metabolism is:





30. The imaging technique most suitable for brain function studies is:





31. Radioprotective drugs function by:





32. The therapeutic use of ultrasound to break kidney stones is called:





33. Laser surgery in ophthalmology is used to:





34. The principle of X-ray production involves:





35. Radiation dose limits for the public are approximately:





36. The advantage of ultrasound over X-rays is:





37. Functional MRI (fMRI) detects:





38. The resolution of MRI depends on:





39. Radiation therapy side effects are mainly due to:





40. A collimator in nuclear medicine imaging is used to:





41. The Larmor frequency in MRI depends on:





42. The main biological hazard of ionizing radiation is:





43. Which imaging method provides the best detail of bone structure?





44. Which imaging modality uses non-ionizing radiation?





45. Which of the following is a nuclear medicine technique?





46. Radiation dose to patients in diagnostic radiology should follow:





47. Which imaging method uses gamma-emitting isotopes for organ function?





48. Which is the main limitation of ultrasound imaging?





49. Contrast agents in MRI often contain:





50. The radiation used in CT scans is: