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 ?
We introduced an order relation X on a subtraction algebras: a < b [??] a - b = 0, where 0 = a - a is an element that does not depend on the choice of a [member of] X.
During testing with a novel number, bees were correct in addition and subtraction of one element 64-72% of the time.
However, when they reach high school and are introduced to brackets, mainly through algebra, it is time to reflect on subtraction.
Hence, the main theme of this work is to determine aclidinium bromide in the presence of formoterol fumarate dihydrate as the interferent using two methods manipulate ratio spectra, namely, ratio derivative and ratio subtraction. The ratio spectra were obtained by dividing aclidinium spectra by a definite concentration of formoterol.
An extract from the academic paper 'The Effects of the Meditation Program on the Brain Function of University Students' published in the Journal of the Completion Education Society stated this: 'After the mind subtraction meditation, the university students' brainwaves became stable and their brain quotient enhanced.
In the case of EM, since there are still some variations in few waves for [mu] > 2 [fm.sup.-1] we extended the range of the subtraction point to 10 [fm.sup.-1].
[sup.99m]Tc-sestamibi/[sup.123]I subtraction SPECT/CT was able to locate 104 enlarged glands correctly, and missed seven enlarged glands that were located in surgery.
Finally, subtraction images of lung volume were obtained by subtracting the warped moving volume images from the current (fixed) volume images.
Figure 1 illustrates a general algorithmic step of background subtraction. [P.sub.t+1] (x,y) is the current real-time image pixel of the location at time t + 1.
Spectral subtraction was used to identify the carbonyl absorptions (near 1690 [cm.sup.-1]) for the nanoparticle ([C.sub.60] and [C.sub.70])--formamide complexes.
Valley Cottage, NY, December 30, 2015 --(PR.com)-- Digital subtraction angiography (DSA) is a digital radiography, digital fluoroscopy, and photo electronic imaging techniques intended for the diagnosis and treatment of various vascular disorders.
In terms of the arithmetic operation, it has traditionally been claimed that adults predominantly use retrieval to solve addition and multiplication and procedures to solve subtraction and division (Barrouillet, Mignon, & Thevenot, 2008; Campbell & Xue, 2001; LeFevre et al., 2006; Seyler et al., 2003).