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 ?
The physical and virtual imagery of a lesser number of units in the minuend as well as the inbuilt mechanism in the software that inherently disallow the subtraction of the larger unit in the subtrahend from the minuend means that students have to rethink their steps so that regrouping must first occur before subtraction can take place.
So, just as it does today, utilizing the current law basis as the minuend in the computation of loss would prevent the taxpayer from having a second opportunity to receive the tax benefit of unclaimed allowable depreciation deductions in the form of a tax loss whether or not they provided tax benefits.
numbers 0-99) for the booster lessons in number concepts, base-ten concepts, and addition and subtraction combinations with sums or minuends to 18, respectively.
Four types of math facts were assessed: addition problems with sums less than 10, addition problems with sums between 10 and 18, subtraction problems with minuends less than 10, and subtraction problems with minuends between 10 and 18.
Bryant, Bryant, TEMI: Addition- 1 126 Gersten, Scammacca, Subtraction (sums or & Chavez (2008) minuends range from 0-18) Clarke, Gersten, ASPENS (working 1 329 Dimino, & Rolfhus title): Basic Facts: (2012) Students are presented 40 problems that can be composed and decomposed in base 10 system Study Outcome Measure Predictive Validity (c)(r) Magnitude Comparison Baglici, Codding, & Timed Mathematics .