| 单词 | Angiography,Digital Subtraction |
| 释义 | Angiography,Digital Subtraction《英文msh词典》Angiography,Digital Subtraction [主题词] Angiography,Digital Subtraction [同义词] Digital Subtraction Angiography [同义词] Subtraction Angiography,Digital [中文释义] 血管造影术,数字减影 [英文释义] 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 digitized 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. |
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