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 common way of checking a subtraction answer is to add together the subtrahend and the difference.
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.
In subtraction, doing the opposite step--for example, adding if you subtracted--only works for the minuend, not the subtrahend.
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.
This procedure produces the same difference as the original problem, since you have mathematically added the same number to both the minuend and the subtrahend.
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.
So I will add 10 (actually, 10 tens) to the 4 to make it 14, and I will add 1 (100) to the 1 (100) in the subtrahend.
The first three addends are nonpositive, the last addend is strictly negative, and all of the subtrahends are strictly positive.
Soon enough she'll brush the cobwebs from her eyes and take a clear look at the world of vowel sounds and subtrahends and partial products, and some bigger things that lie ahead, like state exams, but not just now.
The test comprised randomnly selected samples of 25 addition problems (with single-digit addends and sums of 18 or less) and 25 subtraction problems (with single-digit subtrahends and differences of 9 or less).