Seeing this phrase on your MRI report is understandably alarming. But let’s be clear from the outset: this is not a disease diagnosis. It is a technical quality note from the radiologist, indicating that image quality during the scan was not ideal.
In this article, I’ll walk you through exactly what this phrase means, why it occurs, when it matters, and what it means for you in practice.
Let’s Start With the Terms
Artifact is a term used in medical imaging to describe artificial distortions that do not belong to real anatomy — imperfections introduced into the image for technical reasons. They can occur in X-rays, CT scans, or MRI; however, they are most frequent and most problematic in MRI. The main reason is that MRI takes considerably longer than other methods and is far more sensitive to movement.
Motion artifact refers to the blurring, ghosting, double contours, or ripple lines that appear in an image when the patient moves during the scan. Think of it like taking a photo with a shaky hand — the subject hasn’t changed, but the image comes out blurry. That is precisely what happens in MRI.
Suboptimal simply means “below ideal” — it does not mean “unusable.” With this phrase, the radiologist is essentially saying: “I reviewed and interpreted these images, but due to technical quality limitations, I may not have been able to visualize certain fine details with full clarity.” It is a transparency note intended to inform both the referring physician and the patient.
Why Does Motion Artifact Occur?
An MRI machine generates images by collecting and processing radio wave signals emitted by hydrogen atoms in the body. This process can take seconds per slice and anywhere from 15 to 60 minutes for a full study, depending on the region being examined. Throughout this time, the area being scanned must remain completely still. Even the slightest movement causes signals to overlap, resulting in a degraded image.
The most common causes of motion artifact include:
Involuntary body movements are the most frequent culprit. Shifting due to pain, coughing, swallowing, or taking a deep breath can cause significant degradation — especially in cervical and lumbar MRI studies. Asking a patient with severe back pain to lie still in a narrow tube for twenty minutes is no small feat, and radiologists are well aware of this reality.
Physiological movements are entirely beyond the patient’s control. Heartbeat, vascular pulsations, bowel peristalsis, and respiration create a constant backdrop of motion within the body. In lumbar MRI in particular, aortic pulsation and bowel movement are frequent sources of artifact.
Claustrophobia and anxiety are far more common than generally assumed. The confined, noisy, and dimly lit environment of an MRI scanner can provoke significant anxiety in many patients. An anxious patient tenses their muscles, shifts position frequently, and image quality suffers noticeably as a result.
Pediatric and elderly patients naturally have greater difficulty remaining still. This problem is further compounded in patients with dementia, acute confusion, or severe pain.
Severe pain and orthopedic limitations can make it physically impossible for a patient to remain stationary, even with the best of intentions.
Does Suboptimal Mean the Images Are Unusable?
In most cases, no — suboptimal images are still interpretable. Even when this phrase appears in the report, the radiologist has reviewed the images and documented their findings.
Major pathologies are generally detectable even in suboptimal studies — a prominent disc herniation, advanced spinal canal stenosis, a mass lesion, or widespread edema will typically still be visible.
However, more subtle findings may be missed: a small disc protrusion, early-stage nerve root compression, a thin ligament tear, or a small focal lesion may not be clearly assessable due to motion artifact. This is precisely the purpose of the “suboptimal” note — to alert the clinician and patient to a potential limitation before any decisions are made.
What Should You Do?
Read the report in full and consider the clinical context. If your symptoms are consistent with the findings, your doctor may be able to formulate a treatment plan based on the existing report without needing a repeat scan.
If your symptoms are significant but no meaningful finding was identified, or if your doctor has strong clinical suspicion of a subtle pathology, requesting a repeat scan is entirely reasonable.
The decision to repeat the scan is your doctor’s, not yours. Rather than panicking or immediately booking another appointment, the right first step is always to discuss your results with your doctor in person.
If a Repeat Scan Is Needed: Tips for Better Image Quality
With the lessons learned from the first scan, a repeat study almost always yields significantly better results. The following steps can help:
Pain management is the single most effective step for improving image quality. Speak with your doctor before the scan about taking an appropriate analgesic beforehand. A patient whose pain is under control can remain still for much longer.
Wear comfortable, metal-free clothing. Belt buckles, zippers, underwire bras, and decorative buttons all generate artifact and cause physical discomfort during the scan.
Always mention anxiety before the scan. The MRI technologist can explain the process in advance, provide music headphones, and guide you through breathing techniques. For patients with notable claustrophobia, your doctor may consider mild anxiolytic premedication. Open MRI systems are also an option, though it is worth knowing that image quality may be somewhat lower than with closed-bore systems.
Follow breath-hold instructions. During certain sequences, the technologist may ask you to hold your breath briefly. Complying with these instructions makes a particularly noticeable difference in lumbar and abdominal imaging.
Consider fasting lightly before the scan. Reducing bowel activity by avoiding heavy meals beforehand can help minimize artifact in lumbar region imaging. Check with your imaging center for their specific recommendation.
Find out the scan duration in advance and prepare for it mentally. Knowing how many minutes to expect makes it considerably easier to stay still throughout.
Conclusion
When you see “examination suboptimal due to motion artifact” on your MRI report, treat it as a technical quality note — not a disease finding. The radiologist is communicating that the images were not perfect, but were still interpretable. Whether the report is sufficient for clinical decision-making is a judgment call that belongs to your doctor.
The right response is not to panic, but to discuss the findings with your doctor and, if necessary, repeat the scan under better conditions.
Wishing you good health.
This article has been prepared for general informational purposes only. All individual diagnostic and treatment decisions must be made in consultation with a qualified physician.