CAMRT MRI Exam common mistakes
CAMRT MRI Exam · Understand the traps and how to avoid them.
Answering safety questions from memory of general MRI 'common knowledge' instead of applying the specific screening sequence: check for implants and foreign bodies, verify MR safety status of the device, confirm patient identity and history, then decide.
Candidates study physics and sequence theory heavily and treat safety as easy recall, so they skip the stepwise logic and miss questions where a seemingly safe device (e.g., a programmable shunt valve or an older aneurysm clip) changes the correct answer.
What to do instead
For every safety item, write out the four-step chain in scratch notes before choosing: (1) what is the object/condition, (2) is it MR safe, MR conditional, or MR unsafe, (3) what conditions or verification are required, (4) what action follows. Practise with a list of 20 common implants and devices and label each one.
Confusing T1, T2, and T2* contrast behaviour when asked what a specific tissue or fluid will look like, or which sequence makes something bright.
Candidates memorise 'T1 anatomy, T2 pathology' as a slogan without building a tissue-by-tissue table, so they cannot reason through questions about fat suppression, proteinaceous fluid, or subacute haemorrhage.
What to do instead
Build a one-page grid of tissues (fat, water/CSF, muscle, cortical bone, air, flowing blood, protein-rich fluid, methaemoglobin) against T1, T2, and T2* appearance, and recreate it from memory weekly. For each entry, state the underlying relaxation mechanism in one sentence.
Choosing a sequence or parameter to 'improve image quality' without identifying which trade-off the question is testing (signal-to-noise ratio, contrast, spatial resolution, scan time, artefact).
Protocol questions often list plausible parameters, and candidates pick the one that sounds most advanced rather than the one that addresses the stated problem, because they have not practised linking clinical problems to parameter changes.
What to do instead
For every parameter question, first write the actual problem in the stem (e.g., 'too much motion artefact', 'poor fat suppression at the edges'), then list which parameters affect it and in which direction. Drill 30 stems this way until the mapping is automatic.
Misapplying the Larmor equation or gradient-echo/SE timing relationships, such as calculating resonance frequency at a given field strength or predicting where a chemical-shift artefact appears.
Candidates rely on remembered values at 1.5 T instead of the relationship (frequency proportional to field strength; chemical shift proportional to field strength and inversely proportional to readout bandwidth), so answers fail when the stem uses 3 T or a different bandwidth.
What to do instead
Memorise the proportionality relationships, not just numbers, and re-derive them for 0.5 T, 1.5 T, and 3 T. Practise questions that change one variable at a time and predict the direction of change before calculating.
Failing to recognise an artefact from its described appearance and cause, for example describing a band across the image as pathology or as a coil problem when the stem describes pulsation, truncation, or wrap.
Artefact knowledge is often learned as a picture-matching exercise; without images, candidates cannot map the verbal description to the artefact name or the corrective action.
What to do instead
Create a text-only artefact table: name, appearance in words, mechanism, and two corrective actions. Cover motion, phase wrap/aliasing, chemical shift, susceptibility, truncation (Gibbs), zipper, shading, and pulsation flow. Recite it without images.
Treating patient positioning, coil selection, and centring as minor details, then answering protocol questions that hinge on isocentre placement or coil coverage as if they were purely about sequence choice.
Candidates focus on the scanner console and forget that image quality and safety (SAR, peripheral nerve stimulation, off-isocentre artefacts) depend on setup, which is heavily weighted in entry-to-practice exams.
What to do instead
For each body region, write the standard coil, patient orientation, and centring landmark, and state one consequence of getting each wrong. Include when to use surface versus phased-array coils and why.
Answering contrast-agent questions by naming the agent class without addressing renal function screening, consent, extravasation management, or the distinction between linear and macrocyclic agents.
Candidates reduce contrast safety to 'check eGFR', missing items on gadolinium deposition, pregnancy/lactation, and adverse reaction management that appear in entry-level exams.
What to do instead
Build a contrast checklist: indication, agent class and stability, renal screening threshold, contraindications, consent, adverse reaction signs and first-line management, and documentation. Rehearse it as a sequence.
Skipping the pre-scan patient interview and history in scenario questions, jumping straight to 'position the patient and start the sequence'.
Exam scenarios reward the technically correct answer, and candidates assume the history is already established, so they miss options about removing jewellery, checking for tattoos or medication patches, or verifying pregnancy status.
What to do instead
In every scenario, force yourself to answer three questions before protocol: what could be unsafe, what could degrade the image, and what does the patient need to know. Only then choose the technical action.
Confusing the roles and limits of the technologist, radiologist, and medical physicist, for example deciding to scan an MR-conditional device without confirming the conditions or assuming the technologist can clear an unsafe implant.
Candidates learn the physics and protocols but not the professional-practice boundaries, so they choose clinically reasonable but out-of-scope actions.
What to do instead
Write a short table: task, who is responsible, and what the technologist must document or escalate. Include device condition verification, protocol approval, contrast administration, and adverse event reporting.
Managing time badly by spending too long on calculation or physics items and then rushing the scenario-based patient-care questions that carry equal or greater weight.
Physics questions feel solvable with effort, so candidates over-invest, while scenario items are longer to read and get skimmed, leading to avoidable errors on the sections most tied to entry-level competence.
What to do instead
Do timed practice sets with a hard per-question cap (roughly one minute), flagging calculations to return to. Track accuracy by domain and reallocate study time to the weakest domain rather than the most comfortable one.