MRI ARMRIT EXAM LATEST 2026 UPDATE 100
QUESTIONS AND DETAILED VERIFIED ANSWERS
FROM ACTUAL EXAMS TEST GRADE A+
1. What is the primary purpose of a gradient coil in MRI?
A. To produce RF pulses
B. To align hydrogen nuclei
C. To spatially encode the MRI signal
D. To cool the magnet system
Rationale: Gradient coils vary the magnetic field linearly to encode spatial
information in x, y, and z directions.
ANSWER: C
2. Which tissue has the shortest T1 relaxation time?
A. CSF
B. Fat
C. Muscle
D. Air
Rationale: Fat recovers longitudinal magnetization quickly, producing a short T1
time.
ANSWER: B
3. What does T2 relaxation measure?
A. Longitudinal recovery
B. Transverse decay of spin coherence
,C. Proton density
D. Gradient strength
Rationale: T2 reflects loss of phase coherence in the transverse plane.
ANSWER: B
4. What is the main function of RF coils?
A. Create static magnetic field
B. Transmit and receive signal
C. Shield external noise
D. Cool the system
Rationale: RF coils excite hydrogen nuclei and detect emitted signals.
ANSWER: B
5. Larmor frequency depends on which factor?
A. Gradient strength
B. Magnetic field strength
C. Coil size
D. Slice thickness
Rationale: Larmor frequency is directly proportional to magnetic field strength.
ANSWER: B
6. What is the main cause of image aliasing?
A. High TR
B. Low FOV
C. High TE
D. High bandwidth
,Rationale: Aliasing occurs when anatomy extends beyond the field of view.
ANSWER: B
7. Which pulse sequence is most sensitive to fluid detection?
A. T1-weighted
B. T2-weighted
C. Gradient echo
D. Proton density
Rationale: T2-weighted images highlight fluid as bright signal.
ANSWER: B
8. What does TR control in MRI?
A. Slice thickness
B. Contrast weighting
C. Spatial resolution
D. Gradient strength
Rationale: Repetition time (TR) affects T1 weighting and contrast.
ANSWER: B
9. Which structure is most sensitive to magnetic susceptibility artifacts?
A. Bone marrow
B. Air-tissue interface
C. Muscle
D. Fat
Rationale: Susceptibility artifacts occur at air-bone or air-tissue interfaces.
ANSWER: B
, 10. What is the role of a shim coil?
A. Produce RF pulses
B. Improve magnetic field homogeneity
C. Detect signal
D. Generate gradients
Rationale: Shim coils correct magnetic field inhomogeneities.
ANSWER: B
11. Which parameter increases signal-to-noise ratio (SNR)?
A. Small voxel size
B. Increased slice thickness
C. High bandwidth
D. Short TR
Rationale: Larger voxel size improves SNR.
ANSWER: B
12. What is the main advantage of a spin echo sequence?
A. Faster imaging
B. Reduced artifacts
C. High susceptibility sensitivity
D. No RF pulses
Rationale: Spin echo corrects for field inhomogeneities using a 180° pulse.
ANSWER: B
13. Which contrast agent is most commonly used in MRI?
A. Iodine
B. Gadolinium
QUESTIONS AND DETAILED VERIFIED ANSWERS
FROM ACTUAL EXAMS TEST GRADE A+
1. What is the primary purpose of a gradient coil in MRI?
A. To produce RF pulses
B. To align hydrogen nuclei
C. To spatially encode the MRI signal
D. To cool the magnet system
Rationale: Gradient coils vary the magnetic field linearly to encode spatial
information in x, y, and z directions.
ANSWER: C
2. Which tissue has the shortest T1 relaxation time?
A. CSF
B. Fat
C. Muscle
D. Air
Rationale: Fat recovers longitudinal magnetization quickly, producing a short T1
time.
ANSWER: B
3. What does T2 relaxation measure?
A. Longitudinal recovery
B. Transverse decay of spin coherence
,C. Proton density
D. Gradient strength
Rationale: T2 reflects loss of phase coherence in the transverse plane.
ANSWER: B
4. What is the main function of RF coils?
A. Create static magnetic field
B. Transmit and receive signal
C. Shield external noise
D. Cool the system
Rationale: RF coils excite hydrogen nuclei and detect emitted signals.
ANSWER: B
5. Larmor frequency depends on which factor?
A. Gradient strength
B. Magnetic field strength
C. Coil size
D. Slice thickness
Rationale: Larmor frequency is directly proportional to magnetic field strength.
ANSWER: B
6. What is the main cause of image aliasing?
A. High TR
B. Low FOV
C. High TE
D. High bandwidth
,Rationale: Aliasing occurs when anatomy extends beyond the field of view.
ANSWER: B
7. Which pulse sequence is most sensitive to fluid detection?
A. T1-weighted
B. T2-weighted
C. Gradient echo
D. Proton density
Rationale: T2-weighted images highlight fluid as bright signal.
ANSWER: B
8. What does TR control in MRI?
A. Slice thickness
B. Contrast weighting
C. Spatial resolution
D. Gradient strength
Rationale: Repetition time (TR) affects T1 weighting and contrast.
ANSWER: B
9. Which structure is most sensitive to magnetic susceptibility artifacts?
A. Bone marrow
B. Air-tissue interface
C. Muscle
D. Fat
Rationale: Susceptibility artifacts occur at air-bone or air-tissue interfaces.
ANSWER: B
, 10. What is the role of a shim coil?
A. Produce RF pulses
B. Improve magnetic field homogeneity
C. Detect signal
D. Generate gradients
Rationale: Shim coils correct magnetic field inhomogeneities.
ANSWER: B
11. Which parameter increases signal-to-noise ratio (SNR)?
A. Small voxel size
B. Increased slice thickness
C. High bandwidth
D. Short TR
Rationale: Larger voxel size improves SNR.
ANSWER: B
12. What is the main advantage of a spin echo sequence?
A. Faster imaging
B. Reduced artifacts
C. High susceptibility sensitivity
D. No RF pulses
Rationale: Spin echo corrects for field inhomogeneities using a 180° pulse.
ANSWER: B
13. Which contrast agent is most commonly used in MRI?
A. Iodine
B. Gadolinium
