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 ?
Subtraction: 3 6 4 2 Minuend - 2 1 3 2 Subtrahend 1 5 1 0 Difference Check: 2 1 3 2 Subtrahend + 1 5 1 0 Difference 3 6 4 2 Minuend
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.
Just as utilizing the Gain Basis would have prevented Beulah from falling into the Basis Reduction Tax Trap, utilizing the conventional current law adjusted basis as the minuend in the computation of loss would have prevented her from transforming those useless depreciation deductions into a tax loss.
Adding the same amount--in this case, 3--to both the minuend and the subtrahend is one approach.
Students should try to resolve all the impasses, that is, places where the subtrahend digit is larger than the minuend digit, before subtracting.
Instead of "borrowing," or regrouping, from the minuend, they use what might be referred to as an equal-addition algorithm, whereby an equal amount is added to both the minuend and the subtrahend.
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.
We administered four subtests of the Second-Grade Calculations Battery (SGCB; Fuchs, Hamlett, & Powell, 2003): Sums to 12, Sums to 18, Minuends to 12, and Minuends to 18.
For example, if a lesson focuses on the 5 set, lesson-specific flash cards are facts with addends that sum to 5 and with minuends of 5.
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 .
Following Jordan and Hanich (2000; adapted from Carpenter & Moser, 1984; Riley & Greeno, 1988; Riley, Greeno, & Heller, 1983), Story Problems comprises 14 brief story problems involving sums or minuends of 9 or less, with change, combine, compare, and equalize relationships.