Medical Physics MCQs

1. What is the primary principle behind the functioning of a PET-CT scanner?
A) Using magnetic fields to produce images
B) Detecting positron emissions from radioactive tracers
C) Measuring X-ray absorption by tissues
D) Creating sound waves for imaging
Answer: B) Detecting positron emissions from radioactive tracers

2. Which imaging modality is commonly used to assess bone density and diagnose osteoporosis?
A) Magnetic Resonance Imaging (MRI)
B) Dual-energy X-ray Absorptiometry (DEXA)
C) Positron Emission Tomography (PET)
D) Single Photon Emission Computed Tomography (SPECT)
Answer: B) Dual-energy X-ray Absorptiometry (DEXA)

3. What is the role of a medical physicist in quality assurance (QA) for medical imaging equipment?
A) To perform clinical diagnoses
B) To operate imaging equipment
C) To ensure the accuracy and safety of imaging equipment
D) To administer contrast agents for imaging studies
Answer: C) To ensure the accuracy and safety of imaging equipment

4. In radiation therapy, what is the purpose of using immobilization devices for patients?
A) To minimize patient movement during treatment
B) To shield healthy tissues from radiation
C) To measure radiation dose delivered to the patient
D) To enhance image quality in medical imaging
Answer: A) To minimize patient movement during treatment

5. Which radiation therapy technique delivers radiation continuously while rotating around the patient, targeting tumors from multiple angles?
A) CyberKnife Radiosurgery
B) Intensity-Modulated Radiation Therapy (IMRT)
C) TomoTherapy
D) Stereotactic Radiosurgery
Answer: C) TomoTherapy

6. What is the primary function of a radiation therapist in the treatment of cancer patients?
A) To plan radiation treatment plans
B) To administer radiation therapy to patients
C) To interpret medical images
D) To perform surgery on tumors
Answer: B) To administer radiation therapy to patients

7. Which imaging modality is based on the detection of gamma rays emitted by radioactive tracers injected into the body?
A) Magnetic Resonance Imaging (MRI)
B) Computed Tomography (CT)
C) Positron Emission Tomography (PET)
D) Ultrasound Imaging
Answer: C) Positron Emission Tomography (PET)

8. What is the primary advantage of using MRI over other imaging modalities in assessing soft tissue injuries?
A) Lower radiation dose to patients
B) Higher spatial resolution
C) Faster image acquisition
D) Greater accessibility in clinical settings
Answer: B) Higher spatial resolution

9. Which imaging technique is commonly used to visualize blood flow in arteries and detect blockages?
A) Magnetic Resonance Imaging (MRI)
B) Computed Tomography Angiography (CTA)
C) Positron Emission Tomography (PET)
D) Single Photon Emission Computed Tomography (SPECT)
Answer: B) Computed Tomography Angiography (CTA)

10. What is the primary purpose of using simulation in radiation therapy?
A) To deliver radiation treatment to patients
B) To calculate radiation dose delivered to the patient
C) To visualize the treatment field and plan patient positioning
D) To monitor patient vital signs during treatment
Answer: C) To visualize the treatment field and plan patient positioning

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