Free MRI Practice Quiz

11 – 30 Questions 10 min

This MRI quiz focuses on core physics, pulse sequences, safety screening, and image quality concepts used in diagnostic MRI. Radiographers, MRI technologists, radiology residents, and medical students can use it to check understanding of parameters like TR, TE, flip angle, SAR, artifacts, and tissue contrast behavior.

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Part 1 — Questions

Answer each question on paper. Do not turn the page until you are ready to check your work.

In a standard clinical MRI system, which nuclei primarily contribute to the signal used to form most images?

Hydrogen protons
Carbon nuclei
Electrons
Neutrons

In a clinical MRI scanner, the net magnetization vector of hydrogen protons aligns parallel and antiparallel to the main magnetic field at equilibrium.

True
False

You want to increase T1 weighting in a brain MRI sequence while keeping all other parameters constant. Which change would most directly achieve this?

Use a shorter repetition time
Use a very long echo time
Increase slice thickness
Use a longer repetition time

For a routine high-resolution brain MRI, which coil choice generally provides the best signal-to-noise ratio when available?

Integrated body coil
Extremity surface coil
Neck array coil
Dedicated phased-array head coil

On a sagittal spine MRI, a bright and dark vertical stripe pattern is seen across the image that aligns with the phase-encoding direction and repeats every few pixels. Which artifact is most likely?

Zipper artifact
Motion ghosting
Gibbs ringing
Aliasing

Any surgical clip that was implanted more than ten years ago can be considered safe to scan at 1.5 T without further verification.

True
False

A patient presents for an MRI of the brain and reports having an intracranial aneurysm clip placed many years ago, but no documentation is available and the exact model is unknown. What is the most appropriate next step?

Proceed with MRI using only low-SAR sequences
Delay the scan until clip type is verified from records or imaging
Proceed with MRI at lower field strength without further verification
Cancel the MRI permanently for this patient

On a gradient-echo brain MRI, you observe marked signal loss and distortion around old gunshot fragments. Which artifact is most responsible for this appearance?

Truncation
Chemical shift
Gibbs ringing
Susceptibility

Which set of TR and TE values is most characteristic of a T2-weighted spin-echo brain sequence?

Short TR, short TE
Short TR, long TE
Long TR, short TE
Long TR, long TE

10.

After administration of gadolinium contrast for a suspected brain metastasis, which sequence is typically most sensitive for detecting enhancing lesions?

T2-weighted fast spin echo
T1-weighted spin echo with fat suppression
Diffusion-weighted imaging
FLAIR without contrast

11.

Patient motion during an MRI acquisition typically produces ghosting artifacts that are most prominent along the phase-encoding direction.

True
False

12.

You are adjusting a spin-echo brain sequence to increase T2 weighting. Select all parameter changes that would increase T2 contrast.

A.Increase repetition time
B.Shorten repetition time
C.Increase echo time
D.Decrease echo time

13.

Arrange the following typical steps for starting a standard MRI examination in the correct order, from first to last.

Put these in the correct order (write 1–4 beside each):

____Verify patient identity and safety screening responses
____Plan and start the first diagnostic sequence
____Acquire localizer images
____Position the patient on the table and center the region of interest in the coil

14.

You are imaging the lumbar spine and the radiologist requests higher signal-to-noise ratio, but the patient cannot tolerate a longer scan time. Which adjustment is most appropriate to improve SNR without increasing acquisition time?

Add more phase-encoding steps
Increase slice thickness
Reduce bandwidth to half
Increase number of excitations

15.

An adult patient with a non–MR-conditional cardiac pacemaker is referred for brain MRI at your center, which has no dedicated cardiac device MRI protocol. What is the most appropriate action?

Scan at 1.5 T using standard brain protocol only
Scan at 3 T but limit SAR as much as possible
Proceed after obtaining verbal cardiology approval only
Do not scan and refer to a center with a dedicated pacemaker MRI program

16.

A patient with a programmable ventricular shunt is scheduled for a brain MRI. Select all pre-scan steps that are essential for safe imaging.

A.Verify whether the valve setting needs to be checked or reset after the scan
B.Confirm the shunt is MR-conditional and within field-strength limits
C.Ensure the patient is fasting for at least 6 hours
D.Provide routine hearing protection for gradient noise

17.

An abdominal MRI shows wrap-around of anterior abdominal wall structures onto the spine, indicating aliasing in the phase-encoding direction. Which adjustments can help reduce this artifact? Select all that apply.

A.Decrease slice thickness
B.Apply phase oversampling or anti-aliasing
C.Reduce repetition time
D.Increase field of view in the phase-encoding direction

18.

During a long diffusion-weighted sequence, the system displays a warning that a gradient amplifier duty cycle limit is being approached. If this limit is exceeded repeatedly, which hardware issue is of greatest concern?

Cryogen boil-off
Main magnet quench
Gradient coil overheating
RF coil detuning

19.

You need to minimize metal artifact from spinal hardware on MRI. Which protocol changes are most effective for reducing susceptibility-related distortion and signal loss? Select all that apply.

A.Use fast spin-echo instead of gradient-echo sequences
B.Use very long echo time
C.Shorten echo time
D.Increase receiver bandwidth

Part 2 — Answer key

Compare your answers after you have finished Part 1.

In a standard clinical MRI system, which nuclei primarily contribute to the signal used to form most images?
Hydrogen protons
In a clinical MRI scanner, the net magnetization vector of hydrogen protons aligns parallel and antiparallel to the main magnetic field at equilibrium.
True
You want to increase T1 weighting in a brain MRI sequence while keeping all other parameters constant. Which change would most directly achieve this?
Use a longer repetition time
For a routine high-resolution brain MRI, which coil choice generally provides the best signal-to-noise ratio when available?
Dedicated phased-array head coil
On a sagittal spine MRI, a bright and dark vertical stripe pattern is seen across the image that aligns with the phase-encoding direction and repeats every few pixels. Which artifact is most likely?
Gibbs ringing
Any surgical clip that was implanted more than ten years ago can be considered safe to scan at 1.5 T without further verification.
False
A patient presents for an MRI of the brain and reports having an intracranial aneurysm clip placed many years ago, but no documentation is available and the exact model is unknown. What is the most appropriate next step?
Proceed with MRI using only low-SAR sequences
On a gradient-echo brain MRI, you observe marked signal loss and distortion around old gunshot fragments. Which artifact is most responsible for this appearance?
Truncation
Which set of TR and TE values is most characteristic of a T2-weighted spin-echo brain sequence?
Long TR, long TE
After administration of gadolinium contrast for a suspected brain metastasis, which sequence is typically most sensitive for detecting enhancing lesions?
T1-weighted spin echo with fat suppression
Patient motion during an MRI acquisition typically produces ghosting artifacts that are most prominent along the phase-encoding direction.
True
You are adjusting a spin-echo brain sequence to increase T2 weighting. Select all parameter changes that would increase T2 contrast.
Increase repetition time; Increase echo time
Arrange the following typical steps for starting a standard MRI examination in the correct order, from first to last.
Correct order: Verify patient identity and safety screening responses → Position the patient on the table and center the region of interest in the coil → Acquire localizer images → Plan and start the first diagnostic sequence
You are imaging the lumbar spine and the radiologist requests higher signal-to-noise ratio, but the patient cannot tolerate a longer scan time. Which adjustment is most appropriate to improve SNR without increasing acquisition time?
Increase number of excitations
An adult patient with a non–MR-conditional cardiac pacemaker is referred for brain MRI at your center, which has no dedicated cardiac device MRI protocol. What is the most appropriate action?
Scan at 1.5 T using standard brain protocol only
A patient with a programmable ventricular shunt is scheduled for a brain MRI. Select all pre-scan steps that are essential for safe imaging.
Verify whether the valve setting needs to be checked or reset after the scan; Confirm the shunt is MR-conditional and within field-strength limits
An abdominal MRI shows wrap-around of anterior abdominal wall structures onto the spine, indicating aliasing in the phase-encoding direction. Which adjustments can help reduce this artifact? Select all that apply.
Apply phase oversampling or anti-aliasing; Increase field of view in the phase-encoding direction
During a long diffusion-weighted sequence, the system displays a warning that a gradient amplifier duty cycle limit is being approached. If this limit is exceeded repeatedly, which hardware issue is of greatest concern?
Gradient coil overheating
You need to minimize metal artifact from spinal hardware on MRI. Which protocol changes are most effective for reducing susceptibility-related distortion and signal loss? Select all that apply.
Use fast spin-echo instead of gradient-echo sequences; Shorten echo time; Increase receiver bandwidth

1In a standard clinical MRI system, which nuclei primarily contribute to the signal used to form most images?

2In a clinical MRI scanner, the net magnetization vector of hydrogen protons aligns parallel and antiparallel to the main magnetic field at equilibrium.

True / False

3You want to increase T1 weighting in a brain MRI sequence while keeping all other parameters constant. Which change would most directly achieve this?

4For a routine high-resolution brain MRI, which coil choice generally provides the best signal-to-noise ratio when available?

5On a sagittal spine MRI, a bright and dark vertical stripe pattern is seen across the image that aligns with the phase-encoding direction and repeats every few pixels. Which artifact is most likely?

6Any surgical clip that was implanted more than ten years ago can be considered safe to scan at 1.5 T without further verification.

True / False

7A patient presents for an MRI of the brain and reports having an intracranial aneurysm clip placed many years ago, but no documentation is available and the exact model is unknown. What is the most appropriate next step?

8On a gradient-echo brain MRI, you observe marked signal loss and distortion around old gunshot fragments. Which artifact is most responsible for this appearance?

9Which set of TR and TE values is most characteristic of a T2-weighted spin-echo brain sequence?

10After administration of gadolinium contrast for a suspected brain metastasis, which sequence is typically most sensitive for detecting enhancing lesions?

11Patient motion during an MRI acquisition typically produces ghosting artifacts that are most prominent along the phase-encoding direction.

True / False

12You are adjusting a spin-echo brain sequence to increase T2 weighting. Select all parameter changes that would increase T2 contrast.

Select all that apply

13Arrange the following typical steps for starting a standard MRI examination in the correct order, from first to last.

Put in order

1Verify patient identity and safety screening responses

2Plan and start the first diagnostic sequence

3Acquire localizer images

4Position the patient on the table and center the region of interest in the coil

14You are imaging the lumbar spine and the radiologist requests higher signal-to-noise ratio, but the patient cannot tolerate a longer scan time. Which adjustment is most appropriate to improve SNR without increasing acquisition time?

15An adult patient with a non–MR-conditional cardiac pacemaker is referred for brain MRI at your center, which has no dedicated cardiac device MRI protocol. What is the most appropriate action?

16A patient with a programmable ventricular shunt is scheduled for a brain MRI. Select all pre-scan steps that are essential for safe imaging.

Select all that apply

17An abdominal MRI shows wrap-around of anterior abdominal wall structures onto the spine, indicating aliasing in the phase-encoding direction. Which adjustments can help reduce this artifact? Select all that apply.

Select all that apply

18During a long diffusion-weighted sequence, the system displays a warning that a gradient amplifier duty cycle limit is being approached. If this limit is exceeded repeatedly, which hardware issue is of greatest concern?

19You need to minimize metal artifact from spinal hardware on MRI. Which protocol changes are most effective for reducing susceptibility-related distortion and signal loss? Select all that apply.

Select all that apply

Frequent Errors on MRI Physics and Safety Questions

Learners who already use MRI in practice often miss quiz questions for the same predictable reasons. Review these patterns so you can avoid losing points on concepts you actually use every day.

Confusing T1 and T2 contrast
Many answers swap T1 and T2 characteristics. Remember that T1 weighting highlights fat and subacute hemorrhage, while T2 weighting highlights fluid and edema. Short TR and short TE give T1 weighting. Long TR and long TE give T2 weighting.
Ignoring parameter trade offs
Questions about TR, TE, matrix, and NEX often fail because people focus on a single effect. Any change affects signal to noise ratio, resolution, scan time, and motion sensitivity. For example, finer matrix improves resolution but reduces signal and increases scan time.
Misunderstanding SAR and RF safety
Common mistakes include assuming SAR is only related to field strength or patient weight. SAR increases with higher flip angles, shorter TR, and fast spin echo based techniques. Many questions ask which parameter change will reduce SAR. Think lower flip angle, longer TR, and fewer refocusing pulses.
Overlooking implant and device details
Quiz scenarios often hide an unsafe implant in the history. Learners choose an imaging sequence instead of first deciding if scanning is allowed. Always identify device type, MRI conditional status, field strength limits, and required positioning or SAR restrictions.
Misidentifying artifacts
Artifacts such as aliasing, chemical shift, susceptibility, and motion are frequently mixed up. Use direction, location, and appearance. Wraparound follows phase encode direction. Chemical shift appears at fat water interfaces. Susceptibility causes signal loss and distortion near metal.

MRI Quiz Quick Reference Sheet for Core Concepts

Tip: Print or save this sheet as a PDF for fast review before you start an MRI quiz session.

Basic MRI Physics

Larmor equation: f = γ × B₀. For hydrogen at 1.5 T, frequency is about 64 MHz. At 3 T, about 128 MHz.
Longitudinal vs transverse magnetization: T1 recovery describes regrowth of longitudinal magnetization. T2 decay describes loss of transverse coherence.
T1 relaxation: Fat recovers quickly and looks bright on T1. Fluid recovers slowly and looks dark on T1.
T2 relaxation: Fluid retains transverse magnetization longer and looks bright on T2. Fibrous tissues often look darker.

Image Weighting Rules

T1 weighting: Short TR, short TE. Good for anatomy, fat, post contrast enhancement.
T2 weighting: Long TR, long TE. Highlights fluid, edema, inflammation.
Proton density weighting: Long TR, short TE. Emphasizes proton density with less T1 or T2 contrast.

Key Parameters and Their Effects

TR (repetition time): Longer TR increases signal and reduces T1 weighting. Shorter TR increases T1 weighting and can reduce scan time.
TE (echo time): Longer TE increases T2 weighting and accentuates susceptibility artifacts. Shorter TE improves signal and reduces T2 weighting.
Flip angle: Higher flip angles increase T1 contrast and SAR. Lower flip angles reduce SAR and may reduce contrast.
Matrix size: Larger matrix improves spatial resolution but reduces signal and increases scan time.
NEX/NSA: More averages improve signal to noise ratio but increase scan time.

Safety and Contrast Reminders

Always check implants and devices for MRI conditional information before scanning.
SAR rises with field strength, flip angle, number of RF pulses, and shorter TR.
Gadolinium contrast mainly shortens T1, so enhancing structures appear brighter on T1 weighted images.
Screen for renal impairment, pregnancy, and prior contrast reactions as part of safety assessment.

Worked Example: Adjusting MRI Parameters for Knee Imaging

This example follows a typical quiz style question about parameter changes. The goal is to understand how each change affects contrast, resolution, signal, and scan time.

Scenario: You are imaging a knee at 1.5 T. Current parameters for a sagittal proton density fat saturated sequence are:

TR = 2500 ms
TE = 30 ms
Matrix = 256 × 256
FOV = 16 cm
Slice thickness = 3 mm
NEX = 2

The radiologist wants higher spatial resolution to see small cartilage defects, but scan time should not increase greatly.

Step 1: Identify current strengths and weaknesses

Long TR and short TE give proton density weighting, good for cartilage and menisci.
Matrix 256 × 256 and 3 mm slices provide moderate in plane and through plane resolution.
NEX 2 improves signal to noise ratio at the cost of extra time.

Step 2: Choose parameter changes for higher resolution

Increase matrix from 256 × 256 to 320 × 320. This reduces voxel size and improves in plane detail.
Reduce slice thickness from 3 mm to 2.5 mm if signal allows. This improves depiction of cartilage surfaces.

Step 3: Predict effects and compensate

Higher matrix and thinner slices reduce signal and increase scan time.
To limit scan time, reduce NEX from 2 to 1. Signal to noise ratio will drop, but fine detail improves.
Contrast remains dominated by proton density weighting because TR and TE stay similar.

Quiz questions often ask which combination best improves resolution without a large time penalty. The best answer usually increases matrix or reduces slice thickness, then adjusts NEX or parallel imaging to control scan duration.

MRI Quiz Content and Preparation FAQ

What topics does this MRI quiz focus on?

The quiz centers on core MRI physics, tissue contrast, pulse sequences, safety screening, and common artifacts. Expect questions on T1 and T2 relaxation, TR and TE selection, spin echo versus gradient echo, SAR concepts, and recognition of artifacts such as aliasing, chemical shift, and susceptibility.

How should I prepare if I already work as an MRI technologist?

Review T1 and T2 weighting rules, fast spin echo and gradient echo characteristics, and key safety topics such as implants, devices, and field strength limits. Many experienced technologists miss quiz items on parameter trade offs and SAR. Spend extra time on how TR, TE, flip angle, matrix, and NEX interact.

Does this MRI quiz cover safety scenarios involving implants and pregnancy?

Yes. Safety questions often frame realistic scenarios with pacemakers, aneurysm clips, and other devices. You may also see questions about scanning pregnant patients and exposure limits for staff and escorts. Practice identifying missing information that you must obtain before deciding if the exam can proceed.

How can I use my MRI quiz results to guide further study?

Group your missed questions into themes such as pulse sequence physics, contrast mechanisms, artifacts, or safety. Then revisit textbooks and protocols focused on the weakest area. For example, if you miss artifact questions, study how acquisition direction, bandwidth, and sequence type influence artifact appearance.

Is this MRI quiz useful for exam style preparation?

Yes. The question style mirrors many registry and certification exams that test applied MRI physics and clinical decision making. Use quick mode for short refreshers during busy days. Use full mode when you want a broader assessment of your MRI knowledge across physics, technique, and safety.