Medical Imaging and Radiotherapy Practice Questions

PET Scan Principles

• 31. The detector array of a PET detects: a. Two gamma rays on opposite sides.
• 32. Which is NOT a common chemical element or molecule used as a radioisotope in PET? d. Hydrogen.
• 33. Which is NOT an indication for a PET scan? d. Gastrointestinal transit.
• 34. Why is it important to be punctual for a PET test? b. Due to the radioactive decay of the radioisotopes.

Radiotherapy and LINAC Systems

• 35. In which type of teletherapy is there no exit dose? a. Proton.
• 36. Which is NOT a part of a LINAC? c. Detector array.
• 37. Which equipment is used in proton beam radiotherapy? d. Cyclotron.
• 38. Which type of teletherapy is used prior to surgery? d. Neo-adjuvant.
• 39. Which is a common short-term side effect of neck cancer treatment? b. Mucositis.
• 40. Which type of brachytherapy uses a customized applicator? a. Intraluminal.

Magnetic Resonance Imaging (MRI)

• 41. Which is NOT a main component of an MRI? c. Gamma coils.
• 42. Which particle produces a magnetic field detected by the MRI? b. Hydrogen proton.
• 43. What is the typical Tesla range for a clinical MRI? c. 1.5–3T.
• 44. Which sentence about precession is correct? d. Precession rate is termed Larmor Frequency.
• 45. Which is NOT correct about Gradient Coils? d. Generate the transverse magnetization.
• 46. Choose the correct statement: b. Gradient coils in the horizontal axis generate sagittal images.
• 47. Radiofrequency coils generate: c. Transverse magnetization.
• 48. Which is NOT a contraindication for an MRI? d. Pregnancy.
• 49. Which is NOT an indication for an MRI? d. Bone sonometry.
• 50. What is an advantage of MRI vs. CT scan? a. Some vascular studies can be obtained without a dye.
• 51. Which is key to identifying an MRI image? b. Bone is black.

Ultrasound Imaging Physics

• 52. Which is a component of the ultrasound transducer? d. Piezoelectric elements.
• 53. Which is NOT a sound beam interaction? b. Tonality.
• 54. Which sound interaction is defined as the conversion of acoustic energy into heat? a. Absorption.
• 55. Which sound interaction occurs when waves encounter a non-homogeneous surface? c. Scatter.
• 56. Which sound interaction produces a speckle? c. Scatter.
• 57. Which sound interaction is avoided by using ultrasound gel? b. Acoustic coupling.
• 58. What is the sound frequency range for ultrasound imaging? c. 1–20 MHz.
• 59. Compared to high frequency, low frequency sound waves: a. Generate more penetration but less resolution.
• 60. Which is NOT an indication for ultrasound imaging? c. Electrocardiogram.