We have all been there. You are 20 minutes into a complex scan, and everything seems to be going smoothly. Then, you pull up the images and notice an artifact obscuring the exact area the radiologist needs to see. Alternatively, the patient twitches right at the crucial moment, blurring the image. Now you have to repeat the sequence, setting your schedule back and testing the patience of an already anxious patient.
These scenarios perfectly illustrate why MRI positioning is important. Even minor deviations can drastically impact image quality, workflow efficiency, and the overall patient experience. As technologists, we know that setting up the patient correctly from the start is the foundation of a successful exam. However, dealing with back-to-back appointments and complex patient needs makes achieving that perfect setup challenging.
Understanding common MRI positioning mistakes is the first step toward reducing repeat scans and improving patient comfort. This guide explores the most frequent MRI patient positioning mistakes, why they occur in busy clinical environments, and practical ways to avoid them. By refining your approach, you can eliminate MRI positioning errors and ensure a smoother day for both your team and your patients.
Why MRI Positioning Mistakes Happen More Often Than Expected
Even highly experienced technologists occasionally encounter MRI positioning problems. These issues rarely stem from a lack of knowledge. Instead, they are usually the result of the demanding environments in which we work.
Workflow pressure and time constraints
Modern imaging centers and hospital radiology departments run on incredibly tight schedules. When you have a waiting room full of patients and an ambitious daily quota, the pressure to get the next person on the table is immense. This rush often leads to cutting corners during setup. Technologists might skip adjusting a support pad or rush the landmarking process just to start the scan faster. Unfortunately, this perceived time-saving tactic frequently backfires, resulting in MRI positioning mistakes causing artifacts and necessitating time-consuming repeat scans.
Variability between technologists
Every technologist has their own preferred way of doing things. While individual experience is valuable, a lack of standardized MRI positioning techniques across a department can cause inconsistencies. One technologist might use a specific set of wedges for a knee scan, while another relies purely on the coil's structure. This variability can lead to inconsistent image quality, making it difficult to compare follow-up scans with prior exams.
Underestimating the impact of small positioning errors
It is easy to assume that a patient being off-center by a centimeter will not matter much. However, in magnetic resonance imaging, precision is everything. Small deviations can push the target anatomy out of the scanner's isocenter. This compromises the signal-to-noise ratio and reduces the effectiveness of fat saturation pulses. Recognizing how these minor details affect the final image is crucial for maintaining high standards.
Mistake #1: Misaligning the Patient with the Target Anatomy
Proper alignment is the bedrock of MRI image quality positioning. When the target anatomy is not perfectly aligned with the scanner's isocenter, you compromise the entire exam.
How misalignment affects image quality
The magnetic field and radiofrequency pulses are most uniform at the absolute center of the scanner bore. When you position the patient's anatomy away from this sweet spot, signal intensity drops. This misalignment frequently causes uneven fat suppression, dielectric shading, and an overall decrease in spatial resolution. The radiologist ends up looking at a grainy or uneven image that might obscure subtle pathology.
Common alignment issues in practice
One of the most frequent errors occurs during off-center imaging, such as shoulder or wrist scans. Technologists sometimes fail to shift the patient far enough laterally to bring the joint into the isocenter. Another common issue is rotational misalignment, where a patient’s spine or limb is slightly rotated, making it difficult to acquire true orthogonal planes without extreme angulation of the slices.
How to correct alignment effectively
Take an extra 15 seconds before sending the patient into the bore to visually verify their alignment from the foot of the table. Use the laser alignment lights diligently. If you are imaging an extremity, physically shift the patient's body toward the opposite side of the table to bring the target joint closer to the center. Proper landmarking requires a meticulous eye, and verifying alignment before the scan begins saves you from having to pull the patient back out later.
Mistake #2: Improper Coil Positioning
The radiofrequency coil is the antenna that captures the signal from the patient's body. If the antenna is not positioned correctly, the signal will be weak or distorted.
Relationship between coil placement and signal quality
Surface coils need to be as close to the target anatomy as possible. The signal drops off exponentially the further the coil is from the tissue. If a coil is loose, improperly angled, or placed too far superior or inferior to the area of interest, the resulting images will suffer from a poor signal-to-noise ratio.
Common coil positioning errors
A classic mistake is centering the coil on the skin's surface rather than the internal anatomy. For example, when scanning a robust patient's abdomen, technologists might center the coil too high or too low relative to the liver or kidneys. Another issue is using a coil that is too large for the anatomy, which introduces unnecessary background noise, or failing to secure a flexible coil tightly enough against the skin.
Ensuring consistent placement
Always palpate the anatomical landmarks to ensure the center of the coil aligns with the center of the structure you are imaging. Use straps to gently but firmly secure surface coils against the patient, eliminating air gaps. When using flexible coils, mold them to the contours of the patient’s body to maximize the filling factor and boost signal strength.
Mistake #3: Not Providing Enough Support or Stabilization
Patients cannot hold perfectly still if their bodies are constantly fighting gravity or muscle fatigue. Lack of physical support is a leading cause of motion artifacts.
Why unsupported patients move more
When limbs or joints are left unsupported, muscles eventually twitch or relax involuntarily. A patient might start the scan perfectly still, but as the minutes tick by, their body will naturally seek a more comfortable, resting posture. This subtle settling process registers as motion on your images, blurring fine details and ruining long sequences.
When pads and wedges are necessary
Any space between the patient and the table or coil is an opportunity for movement. The lower back, behind the knees, and under the neck are critical areas that almost always require support. Extremities also need stabilization; a foot left pointing straight up will eventually drift outward due to external rotation of the hip.
Improving stability with proper aids
To prevent involuntary movement, you must actively fill the empty spaces. Pack sponges or pads snugly around the patient’s sides, under their knees, and next to their head. Utilize high-quality MRI positioning aids designed specifically for the modality. These MR Conditional cushions and wedges provide rigid yet comfortable support, locking the anatomy in place without causing pressure points.
Mistake #4: Ignoring Patient Comfort
Technologists are highly focused on acquiring clinical data, but we cannot ignore the human element of the exam. A comfortable patient is a cooperative patient.
Equip Your Team with Tools They Can Trust
Get high-quality, MRI-dedicated equipment that supports safer scans, better positioning, and smoother patient care.
View Trusted ProductsHow discomfort leads to movement
Pain is a massive distraction. If a patient is lying on a hard surface, experiencing lower back pain, or feeling claustrophobic, they will fidget. They might try to tough it out initially, but eventually, the discomfort forces them to shift their weight. This movement often happens right in the middle of your most critical, high-resolution sequence.
Balancing comfort with positioning precision
There is occasionally a conflict between getting the patient into the exact clinical position required and keeping them comfortable. For instance, achieving the perfect amount of external rotation for a shoulder arthrogram can be painful for the patient. The goal is to find the sweet spot where the diagnostic criteria are met without pushing the patient beyond their tolerance limits.
Adjusting positioning for different patient needs
Listen to your patients during the setup phase. If they mention a bad back, immediately offer a knee wedge to take the pressure off their lumbar spine. For elderly or frail patients, use extra padding on the table. Taking two minutes to arrange blankets, adjust neck supports, and ensure they are physically relaxed will drastically reduce motion artifacts and improve the overall MRI positioning workflow.
Mistake #5: Over-Relying on Verbal Instructions
Communication is vital, but simply telling a patient to "hold still" is rarely enough to guarantee a motion-free scan.
Why patients can’t always stay still
Patients often do not realize they are moving. Breathing, swallowing, and involuntary muscle spasms are difficult to control, especially in a stressful, noisy environment like an MRI bore. Additionally, some patients may have cognitive impairments, language barriers, or hearing loss that prevents them from fully understanding your instructions.
Limitations of communication alone
Relying solely on the intercom to manage patient motion is a reactive strategy. By the time you notice the patient moving and tell them to stop, the sequence is already ruined. Verbal instructions are helpful for breath-holds, but they are ineffective for preventing the slow, gradual drifting of a limb over a 30-minute exam.
Supporting instructions with physical stabilization
The best way to ensure compliance is to make movement physically difficult. Combine clear, calm instructions with robust physical stabilization. Explain to the patient why the pads and straps are being used. You can say, "I am placing these cushions next to your head to help you rest and remind you to keep your chin still." This sets clear expectations while providing the physical support they need to succeed.
Mistake #6: Inconsistent Positioning Between Scans or Staff
A high-functioning radiology department relies on reproducibility. When a patient returns for a six-month follow-up, the new images must match the old ones exactly.
Lack of standardized protocols
When departments lack formal MRI positioning best practices, technologists naturally develop their own habits. This leads to varying slice angulations, different field-of-view placements, and inconsistent use of positioning aids. This lack of standardization frustrates radiologists who rely on side-by-side comparisons to track disease progression.
Variability in technique
Even subtle differences in technique matter. If one technologist scans a cervical spine with the patient's head slightly flexed, and another scans it with the head extended, the spinal canal will look completely different. This variability can mask pathology or mimic disease where none exists.
Improving consistency across teams
To avoid these MRI positioning errors, departments should develop and enforce clear, standardized positioning protocols. Create visual guides or quick-reference binders showing the exact setup, coil placement, and required positioning aids for common exams. Regular team meetings to discuss challenging cases and review positioning standards will keep everyone on the same page.
Mistake #7: Not Using the Right Positioning Aids for the Exam
Improvisation is a valuable skill, but using the wrong tools for patient setup usually leads to subpar results.
Choosing the wrong support devices
Rolling up hospital blankets or using folded towels as positioning aids is a common workaround, but it is far from ideal. Blankets compress over time, causing the patient to slowly sink and shift during the scan. They also fail to provide the rigid support necessary to lock a joint in place.
Overusing or underusing certain aids
Some technologists try to cram too many sponges into a tight space, making the patient feel claustrophobic and uncomfortable. Conversely, others underuse aids, leaving large gaps where the patient can easily move. The key is applying the right amount of support exactly where it is needed.
Matching tools to the exam type
Use specialized positioning tools designed for the specific anatomy you are imaging. A dedicated head holder provides vastly better stabilization than a few generic square sponges. Investing in and utilizing a comprehensive set of MR Conditional positioning aids ensures you have the right tool for every scenario, improving both safety and image quality.
How to Avoid These Mistakes in Daily MRI Workflows
Knowing how to avoid MRI positioning errors requires a proactive approach. It involves changing daily habits and prioritizing setup accuracy over sheer speed.
Standardizing positioning techniques
Work with your lead technologist and radiologists to establish baseline positioning rules. Document exactly how the patient should be aligned, which coils to use, and how to angle the slices for every routine exam. When the whole team adheres to these MRI positioning tips for technologists, the overall quality of the department's output rises significantly.
Using the right equipment consistently
Make sure your scan room is stocked with clean, high-quality positioning aids that are easily accessible. If technologists have to leave the room to hunt for a specific knee wedge, they are less likely to use it. Keep the necessary tools organized and within arm's reach of the scanner table.
Improving team communication and training
Encourage an environment where technologists can share tips and ask for help with difficult setups. If you discover a great way to stabilize a pediatric patient for an ankle scan, share that technique with your colleagues. Continuous training and open communication are the best defenses against common MRI positioning mistakes.
Final Thoughts: Small Positioning Adjustments Make a Big Difference
In the complex environment of an MRI suite, it is easy to become overly focused on pulse sequences, parameters, and scan times. However, the most advanced scanner in the world cannot compensate for a poorly positioned patient.
By taking a few extra moments to ensure perfect alignment, secure the coils properly, and maximize patient comfort with the right positioning aids, you can drastically reduce artifacts and repeat scans. Eliminating these common MRI positioning mistakes not only streamlines your workflow but also delivers the high-quality diagnostic images your patients deserve. Small adjustments on the table truly make a massive difference on the screen.
