characteristic curve

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char·ac·ter·is·tic curve

sensitometric curve of radiographic film, a plot of the film density versus the logarithm of the relative exposure.

characteristic curve

a graphic relationship between the optic density (blackness) of an x-ray film and the exposure. Also called D log E curve, Hurter and Driffield curve, sensitometric curve.


(kurv) [L. curvus, bent, crooked]
A bend, chart, or graph.

bell curve

Normal distribution.

curve of Carus

See: curve of Carus

characteristic curve

Sensitometric curve.

dental curve

Curve of Spee.

D log E curve

Sensitometric curve.

dose response curve

A graph charting the effect of a specific dose of drug, chemical, or ionizing radiation.

dye-dilution curve

A graph of the disappearance rate of a known amount of injected dye from the circulation; used to measure cardiac function.

epidemic curve

A chart or graph in which the number of new cases of an illness is plotted over time.

Gaussian curve

Normal distribution.

growth curve

A graph of heights and weights, head circumference, and body mass index of infants and children of various ages. A line connecting the data points produces the curve. Usually the changes in height and weight are shown on the same chart. Growth charts are specific for age and gender.

learning curve

The effect of learning or practice on the performance of an intellectual or physical task. The term describes the acquisition of competence with experience, time, and training.

normal curve

Normal distribution.

receiver operating curve

Abbreviation: ROC curve
A plot of the fraction of true positives test results versus the fraction of false positive test results; the sensitivity of a test versus (1-the test specificity).
Synonym: receiver operating characteristic

sensitometric curve

In radiographic film analysis, the curve derived by graphing the exposure to the film versus the film density. Analysis yields information about the contrast, speed, latitude, and maximum and minimum densities of the film or film-screen system. Digital radiography systems exhibit linear curves.
Synonym: characteristic curve; D log E curve; Hurter and Driffield curve

curve of Spee

See: curve of Spee

Stephan curve

See: Stephan curve

survival curve

In radiobiology, a dose response curve.

time-temperature cooling curve

The mathematical relation that plots the physical and chemical behaviors of dental (and other) materials as their temperature decreases over time.


1. character.
2. typical of an individual or other entity. See also character.

characteristic curve
the photographic characteristics of an emulsion on an x-ray film based on plotting the density of the image obtained against the logarithm of the exposure under specified conditions of development.
characteristic radiation
nearly homogeneous radiation produced in the target of the x-ray tube when orbital electrons are knocked out and replaced by electrons from outer shells.
characteristic x-rays
see characteristic radiation (above).
References in periodicals archive ?
Generation of an in-situ characteristic curve requires physical measurements of the dependent variable and all independent variables, Y, [X.
They have proposed definitions for several characteristic curves and curvature plot of the accelerated curve.
The paper is split into 3 separate sections, predicting (1) the soil water characteristic curve, drained upper limit (DUL), and lower limit (LL); (2) the soil shrinkage curve; and (3) the hydraulic conductivity curve.
Based on the soil moisture characteristic curves (Table 1), soil strength characteristic curves (Table 2), and the relationship between [[Theta].
f]) in the screw channel in front of the die specifies this pressure development and may be used to determine screw characteristic curves of the screw modules of the twin screw extruder.
We have shown that when the relaxation time is long the differences between the screw characteristic curves viscous Newtonian and linear viscoelastic material are large but the effects are small for short relaxation times.
9 and is focused on developing the performance characteristic curves of the metering section of the screw with dies of different geometries and dimensions.
The soil-water characteristic curves observed from the analytical data were compared with the curves predicted from the coefficient values in Eqns 6 and 7 for different coarse-textured (sand, sandy loam, and loamy sand), medium-textured (loam, sandy clay loam, silty clay loam, and clay loam), and fine-textured (sandy clay, silty clay, and clay) soils (Fig.
This behaviour can also be predicted using drift-flux analysis since the characteristic curves are different for different bubble sizes.
A method of comparing the areas under receiver operating characteristic curves derived from the same cases.
1) Further characteristic curves have been obtained from different measurement series at different absolute barometric pressures and are discussed in Kistenich (2005).
The area under the receiver operating characteristic curves for each of the three screening questions using REALM scores as the reference standard was 0.

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