Echo time

{
  "id": "MLC-T-CHM-003542",
  "term": "Echo time",
  "field": "Chemistry",
  "definition": "The time interval in a pulse-echo nuclear magnetic resonance (NMR) experiment between the initial radiofrequency excitation pulse and the peak of the resulting spin echo signal. This parameter is a key determinant of the contrast in magnetic resonance imaging, as different tissues have different T2 relaxation times. By varying the echo time, typically measured in milliseconds, an operator can weight the final image to highlight specific tissue characteristics.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "nuclear magnetic resonance spectroscopy",
    "radiofrequency",
    "spin echo"
  ],
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 687 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/echo-time/"
}