See Also: digital subtraction angiography(medicine)
angiography, digital subtraction(medicine)
SUBTRACTION(law)
subtraction(medicine)
subtraction(dictionary)
subtraction(dictionary)
subtraction technique(medicine)
SUBTRACTION OF CONJUGAL RIGHTS(law)
Angiography(health)
angiography(encyclopedia)

overspill (oh) and angiography, digital subtraction (medicine)


overspill (oh)



people who move out of a big city because there are too many people living there, and go to live in new houses outside the city
::an overspill of workers from London

angiography, digital subtraction (medicine)


angiography, digital subtraction


A method of delineating blood vessels by subtracting a tissue background image from an image of tissue plus intravascular contrast material that attenuates the X-ray photons. The background image is determined from a digitised image taken a few moments before injection of the contrast material. The resulting angiogram is a high-contrast image of the vessel. This subtraction technique allows extraction of a high-intensity signal from the superimposed background information. The image is thus the result of the differential absorption of X-rays by different tissues.