MRI MCQs

What is the primary principle behind MRI?
- A) Magnetic fields and radio waves
- B) X-rays
- C) Ultrasound waves
- D) Nuclear radiation
Which of the following is a common contraindication for MRI?
- A) Diabetes
- B) Pacemaker
- C) Asthma
- D) Hypertension
What type of contrast agent is typically used in MRI?
- A) Iodine-based
- B) Gadolinium-based
- C) Barium-based
- D) Carbon dioxide
In MRI, what does T1 represent?
- A) Longitudinal relaxation time
- B) Spin-lattice relaxation time
- C) Spin-spin relaxation time
- D) Transverse relaxation time
What does a hyperintense signal on T2-weighted MRI images usually indicate?
- A) Fluid presence
- B) Fatty tissue
- C) Bone
- D) Muscle
What imaging sequence is best for evaluating brain tumors?
- A) T1-weighted imaging
- B) T2-weighted imaging
- C) FLAIR imaging
- D) Diffusion-weighted imaging
Which artifact is commonly seen in MRI and can affect image quality?
- A) Chemical shift artifact
- B) Motion artifact
- C) Beam hardening artifact
- D) Grid artifact
Which of the following is a benefit of using MRI over CT?
- A) Lower cost
- B) No ionizing radiation
- C) Faster imaging times
- D) Greater availability
What is the significance of FLAIR imaging in brain MRI?
- A) Visualizes blood vessels
- B) Suppresses cerebrospinal fluid (CSF) signals
- C) Enhances fat signals
- D) Measures perfusion
What is the primary use of diffusion-weighted imaging (DWI) in clinical practice?
- A) Detecting bone fractures
- B) Identifying acute ischemic stroke
- C) Evaluating fat distribution
- D) Tumor staging
What does the term “echo time” (TE) refer to in MRI?
- A) Time between radiofrequency pulse and image acquisition
- B) Time between the application of the RF pulse and peak signal reception
- C) Total imaging time
- D) Time to reach steady-state
Which MRI sequence is particularly useful for imaging the spine?
- A) T1-weighted
- B) T2-weighted
- C) Proton density
- D) Gradient echo
What does a fat-suppressed MRI sequence help to achieve?
- A) Enhance bone visibility
- B) Reduce fat signal interference
- C) Increase scan time
- D) Improve muscle imaging
Which of the following tissues typically appears hypointense on T1-weighted images?
- A) Fat
- B) Water
- C) Muscle
- D) Cartilage
What is the purpose of using gadolinium contrast in MRI?
- A) To enhance fat signals
- B) To improve visualization of vascular structures and lesions
- C) To reduce scan time
- D) To decrease patient discomfort
What is an important safety precaution for patients undergoing MRI?
- A) Avoiding all medications
- B) Removing all metal objects
- C) Fasting for 12 hours
- D) Drinking plenty of water
What does the term “repetition time” (TR) refer to in MRI?
- A) Time between consecutive RF pulses
- B) Time for data acquisition
- C) Time between the application of the RF pulse and the next pulse
- D) Total imaging time
Which type of MRI sequence is best for evaluating soft tissue injuries?
- A) T1-weighted
- B) T2-weighted
- C) Gradient echo
- D) Fast spin echo
What MRI finding is indicative of multiple sclerosis?
- A) Normal brain morphology
- B) White matter lesions
- C) Enlarged ventricles
- D) Cortical atrophy
Which patient population may be particularly sensitive to gadolinium contrast agents?
- A) Elderly patients
- B) Patients with renal insufficiency
- C) Pediatric patients
- D) Pregnant patients
What imaging feature is typically seen in a meningioma on MRI?
- A) Cystic appearance
- B) Dural tail sign
- C) Irregular margins
- D) Hyperintense on T1-weighted images
What does the term “susceptibility artifact” refer to in MRI?
- A) Signal loss due to magnetic field inhomogeneities
- B) Distortion caused by the presence of magnetic materials
- C) Motion-related image blurring
- D) Chemical shift variations
What is the best MRI sequence to visualize brain perfusion?
- A) T1-weighted
- B) Perfusion-weighted imaging (PWI)
- C) T2-weighted
- D) DWI
What is the primary advantage of functional MRI (fMRI)?
- A) Assessment of brain activity
- B) Detailed anatomy visualization
- C) Tumor characterization
- D) Vascular imaging
What does an “in-phase” and “out-of-phase” imaging technique help to identify?
- A) Tumors
- B) Fat-water interfaces
- C) Brain lesions
- D) Vascular structures
In MRI, what does the term “signal-to-noise ratio” (SNR) refer to?
- A) Measure of patient comfort
- B) Comparison of useful signal to background noise
- C) Total imaging time
- D) Contrast agent dosage
What artifact may occur due to patient movement during an MRI scan?
- A) Motion artifact
- B) Chemical shift artifact
- C) Partial volume artifact
- D) Susceptibility artifact
What is the typical MRI appearance of edema?
- A) Hyperintense on T2-weighted images
- B) Hypointense on T1-weighted images
- C) Isointense on all sequences
- D) Well-defined mass
What is the significance of using a contrast agent during an MRI?
- A) To decrease scan time
- B) To enhance visualization of structures and abnormalities
- C) To reduce patient discomfort
- D) To eliminate artifacts
What is the typical MRI finding in a stroke within the first few hours?
- A) Cortical diffusion restriction
- B) Hyperintense lesions on T1-weighted images
- C) Normal brain morphology
- D) Cystic changes

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