TheoryMRI ARRT
Practice Test
750+ practice questions with detailed explanations. Pass your MRI Tech exam on the first try!
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MRI ARRT exam — full Q&A walkthrough
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30 free MRI ARRT questions
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Cross-Sectional Anatomy
Which lobe of the brain is primarily responsible for processing visual information?
Correct — A. The occipital lobe, located at the posterior of the brain, contains the primary visual cortex (V1) and is the main processing center for visual input from the retina. -
Cross-Sectional Anatomy
On a sagittal MRI brain image, the central sulcus separates which two lobes?
Correct — C. The central sulcus (Rolandic fissure) runs in the coronal plane and forms the boundary between the frontal lobe anteriorly and the parietal lobe posteriorly. -
Cross-Sectional Anatomy
CSF produced in the lateral ventricles flows into the third ventricle through which structure?
Correct — D. The interventricular foramina of Monro (foramina of Monro) connect each lateral ventricle to the midline third ventricle, allowing CSF to flow between these chambers. -
Cross-Sectional Anatomy
On axial MRI, the cerebral aqueduct (of Sylvius) connects which two structures?
Correct — A. The cerebral aqueduct is a narrow CSF channel running through the midbrain tegmentum, linking the third ventricle superiorly to the fourth ventricle inferiorly. -
Cross-Sectional Anatomy
Which choroid plexus produces the greatest volume of CSF in the adult brain?
Correct — C. The choroid plexus within the lateral ventricles (particularly in the trigone/glomus region) produces approximately 70–80% of total CSF, far exceeding the contributions from the third and fourth ventricle plexuses. -
Cross-Sectional Anatomy
On a coronal MRI, the caudate nucleus and putamen are separated by which structure?
Correct — B. The internal capsule (anterior limb and genu) passes between the caudate head medially and the lentiform nucleus (putamen + globus pallidus) laterally, visually separating the caudate from the putamen. -
Cross-Sectional Anatomy
On T2-weighted MRI the globus pallidus typically appears hypointense compared to the putamen. This is primarily due to:
Correct — D. Normal iron accumulation in the globus pallidus (and substantia nigra) causes T2 shortening (hypointensity). This physiologic iron deposition increases with age and is greatest in the globus pallidus among the basal ganglia nuclei. -
Cross-Sectional Anatomy
The lentiform nucleus is composed of which two structures?
Correct — A. The lentiform (lenticular) nucleus consists of the putamen laterally and the globus pallidus (divided into external and internal segments) medially. Together with the caudate nucleus it forms the striatum (as a functional unit). -
Cross-Sectional Anatomy
From superior to inferior, what is the correct order of brainstem divisions?
Correct — C. The brainstem is divided superiorly to inferiorly as midbrain (mesencephalon), pons (metencephalon), and medulla oblongata (myelencephalon), transitioning into the spinal cord at the foramen magnum. -
Cross-Sectional Anatomy
Which cranial nerve exits the dorsal surface of the brainstem?
Correct — D. The trochlear nerve (CN IV) is unique in exiting the dorsal (posterior) surface of the midbrain, just below the inferior colliculi. All other cranial nerves emerge from the ventral or lateral brainstem surfaces. -
Cross-Sectional Anatomy
The cerebellar vermis is best seen on which MRI plane?
Correct — A. The midline sagittal plane displays the cerebellar vermis in its entirety, clearly showing its lobular anatomy and its relationship to the fourth ventricle, brainstem, and tentorium cerebelli. -
Cross-Sectional Anatomy
The primary fissure of the cerebellum separates which two major lobes?
Correct — C. The primary fissure (preculminate fissure) is the deepest fissure on the superior cerebellar surface and divides the anterior lobe (lobules I–V) from the posterior lobe (lobules VI–IX). -
Cross-Sectional Anatomy
On a T1 sagittal MRI, the dentate nucleus of the cerebellum appears as:
Correct — B. The dentate nucleus is the largest and most lateral cerebellar deep nucleus; it has a corrugated (crinkled) appearance on MRI and contains significant iron, making it hypointense on T2 and slightly hypointense on T1 relative to surrounding white matter. -
Cross-Sectional Anatomy
On a midline sagittal MRI, the most anterior part of the corpus callosum is called the:
Correct — D. The corpus callosum is divided from anterior to posterior into the rostrum (inferiormost), genu (anterior bend), body (trunk), and splenium (posterior thickening). The genu is the most anteriorly visible portion on a true midline sagittal. -
Cross-Sectional Anatomy
Fibers of the corpus callosum that interconnect the occipital lobes pass through which portion?
Correct — A. The splenium, the thickest and most posterior part of the corpus callosum, carries fibers connecting the occipital (and posterior parietal) lobes. These fibers fan out as the forceps major. -
Cross-Sectional Anatomy
The arcuate fasciculus is a white matter tract that connects which regions and is critical for which function?
Correct — B. The arcuate fasciculus (part of the superior longitudinal fasciculus) arcs through the temporal and frontal lobes connecting Wernicke's area (language comprehension) to Broca's area (speech production); damage causes conduction aphasia. -
Cross-Sectional Anatomy
On DTI tractography, the corticospinal tract descends through which portion of the internal capsule before entering the cerebral peduncles?
Correct — C. The corticospinal (pyramidal) tract runs in the posterior limb of the internal capsule, specifically its anterior two-thirds. It then continues into the middle three-fifths of each cerebral peduncle in the midbrain. -
Cross-Sectional Anatomy
The thalamus is connected across the midline third ventricle by which structure?
Correct — A. The massa intermedia (interthalamic adhesion or middle commissure) is a gray-matter bridge connecting the two thalami across the cavity of the third ventricle; it is absent in about 20–30% of people. -
Cross-Sectional Anatomy
On coronal MRI, the hypothalamus is located relative to the thalamus in which position?
Correct — D. The hypothalamus forms the floor and inferolateral walls of the third ventricle, lying anteroinferior to the thalamus. The hypothalamic sulcus on the lateral wall of the third ventricle marks their boundary. -
Cross-Sectional Anatomy
The lateral geniculate nucleus (LGN) of the thalamus relays visual information to which cortical area?
Correct — B. The LGN receives input from the optic tract and projects to the primary visual cortex (V1, Brodmann area 17) in the occipital lobe via the optic radiations (geniculocalcarine tract) that pass through the temporal and parietal white matter. -
Cross-Sectional Anatomy
Which structure of the limbic system is most commonly associated with memory consolidation and is frequently affected early in Alzheimer's disease?
Correct — C. The hippocampus, located in the medial temporal lobe, plays a central role in converting short-term memories into long-term memories. It is among the earliest structures to show atrophy and tau pathology in Alzheimer's disease. -
Cross-Sectional Anatomy
On coronal MRI the amygdala is located immediately anterior and slightly superior to the hippocampal head. Both structures lie in which lobe?
Correct — A. The amygdaloid complex and hippocampus are both mesial (medial) temporal lobe structures. The amygdala sits just rostral to the hippocampal head within the uncus. -
Cross-Sectional Anatomy
The fornix carries efferent fibers from the hippocampus primarily to which structure?
Correct — D. The main postcommissural fornix fibers project from the hippocampus (subiculum) to the mammillary bodies of the hypothalamus, which then relay to the anterior thalamic nuclei via the mammillothalamic tract — a key segment of the Papez circuit. -
Cross-Sectional Anatomy
On sagittal MRI, the posterior pituitary (neurohypophysis) normally appears as:
Correct — B. The normal posterior pituitary contains arginine vasopressin (ADH) bound to neurophysin stored in granules; this causes characteristic T1 hyperintensity — the 'posterior pituitary bright spot.' Its absence can indicate central diabetes insipidus. -
Cross-Sectional Anatomy
Bitemporal hemianopia is caused by compression of which anatomical structure at the level of the sella?
Correct — A. The optic chiasm sits just above the sella turcica. Suprasellar masses (e.g., pituitary macroadenoma, craniopharyngioma) compress the decussating nasal retinal fibers at the chiasm, interrupting the temporal visual fields bilaterally — classic bitemporal hemianopia. -
Cross-Sectional Anatomy
The cisterna magna is a CSF cistern located between which structures?
Correct — D. The cisterna magna (cerebellomedullary cistern) is located posterior to the medulla oblongata and inferior to the cerebellar vermis, between the inferior surface of the cerebellum and the dorsal surface of the medulla. -
Cross-Sectional Anatomy
On axial MRI at the level of the pons, the basilar artery is typically seen:
Correct — B. The basilar artery runs in the prepontine cistern, lying in the basilar groove on the anterior surface of the pons. It is formed by the junction of the two vertebral arteries at the pontomedullary junction. -
Cross-Sectional Anatomy
The facial (CN VII) and vestibulocochlear (CN VIII) nerves enter the temporal bone through which foramen and can be identified on high-resolution MRI?
Correct — C. Both CN VII and CN VIII travel through the internal auditory canal (internal auditory meatus). High-resolution T2 sequences (e.g., FIESTA, CISS) depict the fluid-filled IAC and the individual nerve fascicles within it. -
Cross-Sectional Anatomy
On axial MRI of the cervical spine, the gray matter of the spinal cord produces a characteristic 'H' or butterfly shape. The anterior (ventral) horns of the gray matter contain primarily:
Correct — A. The anterior (ventral) horns of spinal gray matter contain the cell bodies of alpha and gamma motor neurons (lower motor neurons) whose axons exit via the ventral roots to innervate skeletal muscle. -
Cross-Sectional Anatomy
The cervical enlargement of the spinal cord occurs approximately at which vertebral levels?
Correct — D. The cervical enlargement, where cord cross-sectional area is greatest due to the neurons supplying the upper limbs, spans approximately C4–C8 (sometimes listed as C5–T1). This region gives rise to the brachial plexus.
MRI ARRT sample questions
Tap any question below to reveal the answer and a plain-English explanation.
Cross-Sectional Anatomy On sagittal T2 MRI the posterior longitudinal ligament (PLL) appears as a thin dark band posterior to the vertebral bodies. Ossification of the PLL (OPLL) most commonly affects which region of the spine?
A. Lumbar spine
B. Cervical spine ✓
C. Thoracic spine
D. Sacral spine
Correct — B. OPLL most frequently involves the cervical spine (approximately 70% of cases), where it can cause cervical myelopathy by compressing the spinal cord in the canal. It is particularly prevalent in Asian populations.
Contrast Agents What element is the basis of most MRI contrast agents?
A. Gadolinium ✓
B. Iodine
C. Barium
D. Iron oxide
Correct — A. Gadolinium (Gd³⁺) is a paramagnetic lanthanide used in most MRI contrast agents because its seven unpaired electrons strongly shorten T1 relaxation time. Iodine and barium are used in X-ray/CT, not MRI.
Instrumentation Which type of MRI magnet uses liquid helium to maintain superconductivity?
A. Superconducting magnet ✓
B. Permanent magnet
C. Resistive magnet
D. Hybrid magnet
Correct — A. Superconducting magnets are cooled with liquid helium to near absolute zero (≈4 K), allowing current to flow without resistance and maintaining the strong static field. Permanent and resistive magnets do not require cryogens.
Patient Care & Screening Which screening form item is MOST critical to review before allowing a patient into the MRI scanner room?
A. Insurance coverage information
B. Previous CT scan history
C. Presence of any ferromagnetic implants ✓
D. Patient's dietary restrictions
Correct — C. Ferromagnetic implants can be displaced or heated by the MRI magnetic field, posing a serious safety risk. Screening for metallic implants is the highest priority before MRI.
MR Physics The unit of magnetic field strength (B0) used to express MRI main field strength is the:
A. Tesla ✓
B. Gauss
C. Weber
D. Ampere
Correct — A. Tesla (T) is the SI unit for magnetic flux density (B0). While Gauss is also used (1 T = 10,000 G), clinical MRI field strengths are standardly expressed in Tesla.
Imaging Procedures Which MRI sequence is most commonly used as the primary workhorse for brain imaging due to its excellent soft-tissue contrast?
A. T2-weighted FSE ✓
B. T1-weighted GRE
C. Diffusion-weighted imaging
D. MR angiography
Correct — A. T2-weighted fast spin-echo (FSE) provides excellent contrast between gray matter, white matter, and CSF, making it the standard sequence for brain pathology detection. T1 is better for anatomy, while DWI and MRA serve specialized roles.
Pulse Sequences In a conventional spin-echo (SE) sequence, which two RF pulses define the sequence?
A. 90° excitation followed by 180° refocusing ✓
B. 180° inversion followed by 90° excitation
C. 45° excitation followed by 90° refocusing
D. 90° excitation followed by 90° refocusing
Correct — A. A conventional SE sequence uses a 90° pulse to tip magnetization into the transverse plane, then a 180° refocusing pulse to rephase spin dephasing caused by field inhomogeneities, producing a spin echo at time TE.
MR Safety & Zones Zone I in the ACR MR safety zoning model refers to which area?
A. General public areas outside the MR environment ✓
B. The MR control room
C. The patient holding/screening area
D. The magnet room
Correct — A. Zone I is the unrestricted area accessible to the general public, such as waiting rooms and corridors outside the MR department.
About the MRI ARRT test
Pass your MRI Exam with confidence. MRI ARRT Exam Prep gives you 750+ realistic practice questions with clear, detailed explanations for every answer.
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Patient Care & Screening, MR Safety & Zones, MR Physics, Instrumentation, Pulse Sequences, Imaging Procedures — and more.
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You will be tested on
- Safe and effective care environment
- Health promotion and maintenance
- Psychosocial and physiological integrity
- Pharmacology, infection control and patient safety
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Topics in this question bank
Safe and effective care environment
Health promotion and maintenance
Psychosocial and physiological integrity
Pharmacology, infection control and patient safety
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