subtraction

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subtraction

 [sub-trak´shun]
the photographic or electronic removal of overlying structures from radiologic images.

sub·trac·tion

(sŭb-trak'shŭn),
A technique used to enhance detectability of opacified anatomic structures on radiographic or scintigraphic images; a negative of an image made before introduction of contrast medium or radionuclide is photographically or electronically removed from a later image; commonly used in cerebral angiography.
See also: digital subtraction angiography, mask.

sub·trac·tion

(sŭb-trak'shŭn)
A technique used to enhance detectability of opacified anatomic structures on radiographic or scintigraphic images; a negative of an image made before introduction of contrast medium or radionuclide is photographically or electronically removed from a later image; commonly used in cerebral angiography.
See also: digital subtraction angiography, mask

subtraction

(sŭb-trak′shŏn)
Removal of undesired overlying structures from a radiographical image by superimposing an image taken before the addition of contrast material with one taken after.
References in periodicals archive ?
18 Calculate the following: multiply 10 by 4, subtract 22, multiply by 4, and finally divide by 8?
Subtract cash payments made to acquire inventory by adjusting reported cost of goods sold by any changes in inventory and accounts payable reported on the balance sheets add increases in inventory occurring during period and subtract decreases add decreases in accounts payable occurring during period and subtract increases
* Add increase in LIFO reserve or subtract decrease in LIFO reserve.
Subtract the number in the ones place in the bottom number from the number now in the ones place in the top number (in this case, 16-9).
Modeling the human variations in the mouse by modifying the mice to add or subtract a humanlike gene with its variations will help scientists unlock the secrets of these and other human diseases in a genetically varied humankind.
Then decide to add or subtract this value from the coordinate, depending on the cutter position.
Add them together and then subtract 97 from that total and continue to subtract 97 until a minus number is reached.
It allows developed countries to subtract CO2 amounts absorbed through afforestation and reforestation conducted since 1990.
Annual Conference Schedule Revised to Add Sessions, Subtract Formality
Then subtract the number in column 1 from your AGE and multiply that figure by the Rate on Excess in column 4.
2) then subtract the number you started with from the total.
In 1642 the French mathematician Blaise Pascal (1623-1662) invented a calculating machine that could add and subtract. It had wheels that each had 1 to 10 marked off along its circumference.