perflutren protein-type A microspheres

{
  "id": "MLC-T-ONC-015965",
  "term": "perflutren protein-type A microspheres",
  "field": "Oncology and biomedicine",
  "definition": "A sterile non-pyrogenic suspension of microspheres of human serum albumin with the stable, high-molecular-weight fluorocarbon gas perflutren, used as a contrast enhancement agent for ultrasound procedures. Because the acoustic impedance of perflutren protein-type A microspheres is much lower than that of blood, impinging ultrasound waves are scattered and reflected at the microsphere-blood interface and may be visualized with ultrasound imaging. At the frequencies used in adult echocardiography (2-5 MHZ), the microspheres resonate which further increases the extent of ultrasound scattering and reflection.",
  "references": [
    "National Cancer Institute Thesaurus"
  ],
  "url": "https://mlchart.com/terminology/oncology/perflutren-protein-type-a-microspheres/"
}