Metal artifacts caused by gradient switching

Electrocardiogram artifacts caused by deep brain stimulation.

BACKGROUND Deep brain stimulation (DBS) is increasingly used to treat a variety of neurological conditions (e.g. movement disorders and chronic pain). This prospective study was designed to detect electrocardiogram (ECG) artifacts induced by deep brain stimulation and to investigate which factors (patient disease, electrode position within the brain or type of stimulation) produced these artifa...

Estimating Imaging Artifacts Caused by Internal Multiples

Imaging with seismic data is typically carried out under the assumption of single scattering. Here we illustrate a theory that includes multiply scattered waves in the imaging process. We estimate artifacts in the image caused by internal multiples rather than estimating the multiples themselves in the data. The theory behind this approach comes from a series derived from the LippmannSchwinger ...

Filtration artifacts caused by overloading membrane filters.

The conventional practice of using 0.45 or 0.40 microm membranes to distinguish between the particulate and dissolved phases in natural waters neglects the importance of colloids. Many of the colloids in natural waters pass through 0.45 or 0.40 microm membranes, but a significant fraction at the upper end of the colloidal particle size range is retained. Membrane clogging during filtration decr...

Reduction of CT artifacts caused by metallic implants.

A technique to reduce metallic implant artifacts on computed tomography scans is presented. The implant boundaries are determined semiautomatically; the missing projection data are replaced by linear interpolation. The complete procedure requires 1-2 minutes per scan. Images with greatly improved quality were obtained in the presence of surgical clips and pelvic implants; success is limited in ...

Towards characterizing and reducing artifacts caused by varying projection truncation