ARRT RRA common mistakes
ARRT RRA · Understand the traps and how to avoid them.
Computing cumulative or weekly dose limits from memory and mixing up whole-body versus extremity or lens limits, or applying the occupational limit to a member of the public.
There are several numeric limits (whole body, lens, extremity/skin, public, fetus) that are easy to conflate under time pressure, and candidates often memorize only one number.
What to do instead
Build a one-page limit table grouped by category (occupational whole body, lens, extremity, public, gestational) and drill it until each value is tied to its category, not floating alone.
When a patient reports new or worsening symptoms during a procedure, continuing the exam and planning to tell the radiologist afterward.
Candidates focus on completing the ordered study and underestimate their responsibility to interrupt for a change in patient condition.
What to do instead
Practice a stop-and-report rule: any acute change in symptoms halts the procedure, the radiologist is notified, and the event is documented before resuming.
Selecting a contrast agent or premedication plan without first checking renal function, prior reaction history, and current medications such as metformin.
The protocol is often treated as routine, so screening questions get skipped or abbreviated when the schedule is busy.
What to do instead
Use a fixed pre-contrast checklist (eGFR/creatinine, allergy and reaction history, metformin, pregnancy status) and rehearse it aloud until it becomes automatic.
Misidentifying the patient by calling a name in a waiting area rather than using two independent identifiers at the point of care.
Workflow habits from high-volume settings train candidates to rely on room or schedule position instead of active verification.
What to do instead
Practice the two-identifier script (full name plus date of birth or medical record number) with the patient confirming, and apply it before every study, including portable exams.
Positioning for a projection by centering on a remembered landmark rather than palpating and aligning to the actual anatomy and patient habitus.
Textbook landmarks assume average body habitus, and candidates transpose them without adjusting for obesity, asthenia, or prior surgery.
What to do instead
For each common projection, state the palpable landmark, the centering point, and one habitus adjustment before positioning; verify alignment on the image and correct rather than accept.
Setting exposure factors by copying a prior technique without accounting for part thickness, pathology, or the required receptor exposure.
Copying techniques is fast and usually works, so candidates stop reasoning about the physics behind the number.
What to do instead
Practice deriving technique from thickness and density using a fixed rule set, then compare with the prior technique and justify any deviation before exposing.
Failing to modify sterile or aseptic technique when the field is compromised, such as reaching over a sterile drape or turning away from the field.
Candidates concentrate on the procedure steps and treat sterility as background rather than an active constraint.
What to do instead
Rehearse the sterile field boundaries and the rule that any break requires stopping and re-preparing; narrate your movements during practice so violations become visible.
Accepting an image with a positioning or artifact problem and sending it for interpretation instead of repeating or correcting it.
Repeat anxiety and time pressure push candidates to rationalize marginal images as acceptable.
What to do instead
Define explicit accept/reject criteria for each projection in advance and apply them before closing the study; document and repeat when criteria are not met.
Judging image quality by brightness alone without evaluating contrast, spatial resolution, noise, and whether the anatomy of interest is included.
Brightness is the most visually obvious parameter, so candidates anchor on it and miss collimation, rotation, or motion problems.
What to do instead
Evaluate every image against a fixed four-part checklist (inclusion and collimation, positioning and rotation, contrast and noise, motion and artifacts) and state each finding.
Misreading a repeat or rejection pattern as a patient problem rather than tracing it to a technique, positioning, or equipment cause.
Candidates treat each rejected image as an isolated event and do not review trends across exams.
What to do instead
Review rejection data by projection and cause, and for each repeat identify the modifiable factor (centering, exposure, communication, equipment) before changing practice.