I'm guessing their doing your spine because they want to see if those "artifacts" found on the spine in the earlier MRI have changed, or increased in number, or if they are more clearly defined with another MRI. In general, the term partial-volume artifact describes any artifact that occurs when the size of the image voxel is larger than the size of the feature to be imaged. Artifacts caused by dental restorations, such as dental crowns, dental fillings and orthodontic appliances, are a common problem in MRI and CT scans of the head and neck. At many institutions, the FLAIR pulse sequence has become a routine part of MRI studies of the brain. These artifacts are particularly problematic in spinal imaging, in which they may artifactually widen or … An image artifact is a structure not normally present but visible as a result of a limitation or malfunction in the hardware or software of the MRI device, or in other cases a consequence of environmental influences as heat or humidity or it can be caused by the human body (blood flow, implants etc.). Artifacts and Pitfalls in Diffusion MRI Denis Le Bihan, MD, PhD,* Cyril Poupon, PhD, Alexis Amadon, PhD, and Franck Lethimonnier, PhD Although over the last 20 years diffusion MRI has become an established technique with a great impact on health care and neurosciences, like any other MRI technique it remains subject to artifacts and pitfalls.
The knowledge of MRI artifact s (brit. Gibbs artifacts (also known as truncation, ringing, or spectral leakage artifacts) typically appear as multiple fine parallel lines immediately adjacent to high-contrast interfaces. What does this mean on an MRI of Brain Findings: "The bilateral globi pallidi demonstrate decreased signal on T-2 weighted images and markedly decreased signal on GRE images consistent with blooming artifact related to the abnormal calcifications in the bilateral basal ganglia seen on brain PET/CT."

We have observed kinetic artifacts caused by discreet patient movement, and artifacts may also be caused at the cervical level by swallowing or by cardiac motion at the thoracic level, despite the use of saturation bands .

Artifacts are more frequently generated at the level of the spinal cord than in the brain. First described by Hajnal et al. [] in 1992, FLAIR MRI techniques consist of an inversion recovery pulse to null the signal from CSF and a long echo time to produce a heavily T2-weighted sequence.The FLAIR technique produces images highly sensitive to T2-weighted prolongation in tissue. You may or may not need an MRI of the brain, depending on what they might find. The aim of this in-vitro study was to identify and evaluate the artifacts produced by different dental restoration materials in CT and MRI images.

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