stepwedge

stepwedge

 [step´wej]
a device used for comparing exposure intensities in photography or radiography; a series of tones from white to black (photography) or plates of increasing thickness (radiography) are placed between the energy sources and the film and differences in exposure are noted.

stepwedge

[step′wej]
an aluminum device that, when exposed to x-rays, displays a range of exposure intensities on a radiograph. These exposure "steps" are analyzed to determine the speed characteristics of the radiographic film. Also called penetrometer.

stepwedge,

n an aluminum device that, when exposed to roentgen rays, displays a range of exposure intensities on a radiograph. These “steps” are analyzed to determine the speed characteristics of the radiographic film. See also penetrometer.

stepwedge

a block of aluminum shaped like a series of steps. Used to test the characteristics of the x-ray beam, film, filters and to standardize exposure factors.
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References in periodicals archive ?
The aluminum stepwedge was fixed to the radiographic sensor on the longer side (BARBOSA et al.
To measure relative bone density, an aluminum stepwedge is normally used in research as a unit of reference for density measurement, which enables a correlation between the values of bone and metal.
1] by selecting areas of interest in bony regions and the steps of the aluminum stepwedge that showed similarity between the gray tones.
Optical density evaluation around the zirconia granules used as graft in rat calvaria/Avaliacao da densidade optica ao redor dos granulos de zirconia usados como enxerto na calvaria de ratos
5 cm x 1 mm), which contained a graduated aluminum stepwedge varying from 1 to 10 mm in thickness and uniform steps of 1 mm each.
Both materials overcame 3 steps from the aluminum stepwedge, which is the minimum recommended by ANSI/ADA specification 57 [24], whereas the pozzolan Portland cements did not meet this requirement (109.
Comparative analysis of selected physicochemical properties of Pozzolan Portland and MTA-based cements
Intensity calibration was carried out using an intensity stepwedge prior to gel image capture.
Functional status and inflammation after preseason training program in professional and recreational soccer players: a proteomic approach
Beyer-Olsen, Orstavik [1] (1981) included in their studies a reproducible comparison standard using a 2-mm-increment aluminum stepwedge to determine the radiopacity of several root canal sealers.
Rochester, NY, USA) next to a graduated aluminum stepwedge with thickness ranging from 2 to 16 mm (in 2 mm-increments) and exposed using a GE-1000 X-ray unit (General Electric, Milwaukee, WI, USA) operating at 50 kVp, 10 mA, 18 pulses/second, and focus-film distance of 33.
Radiopacity evaluation of root canal sealers containing calcium hydroxide and MTA
Bone mineral density measurements were performed on the panoramic radiographs with the help of a five-step copper stepwedge phantom, attached to each film cassette, which was calibrated before hand by DEXA.
Radiographic signals detection of systemic disease. Orthopantomographic radiography/ Deteccion de signos radiograficos en enfermedades sistemicas. Radiografia ortopantomografica
Exposure times were determined using a stepwedge to calibrate densities of the three film-speed/collimator combinations to a particular step on the wedge.
Effects of beam collimation on image quality
This method is specifically indicated for research related to stepwedge penetrometer and photodensitometer.
Este metodo se indica especificamente para la investigacion con el penetrometro stepwedge y el fotodensitometro.
A singular method to compare dental radiographic films used to study maxillofacial structures/Un singular metodo comparativo de radiografias dentales usadas en estudios de estructuras maxilofaciales

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