Contrast materials, also called contrast agents or contrast media, are used to improve pictures produced by x-rays, computed tomography (CT), magnetic resonance imaging (MRI) and ultrasound.

Barium Sulfate Polymer Microspheres are perfect for scientists searching for microparticles opaque to X-ray and other imaging techniques with high sphericity and tight particle size distribution. Barium Sulfate contrast material is embedded into the polyethylene microspheres and acts as a radiocontrast agent for X-ray imaging and other diagnostic procedures.