sensitometer

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sensitometer

 [sen″sĭ-tom´ĕ-ter]
a device used to produce a stepwedge of photographic density; used in quality assurance testing.

sensitometer

(sĕn″sĭ-tŏm′ĕ-tĕr)
A calibrated instrument with an optical step wedge and light source that puts a graduated set of densities on a radiographic film; used in quality control monitoring for film processors.
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The sensitometric curve of the Fujix system did not show a shoulder (saturation) and, therefore, the last step was considered the OD value of the shoulder for the calculation of contrast index.
The densities of all 21 steps are measured and plotted on a graph called a characteristic, sensitometric or Hurter and Driffield (H & D) curve.
It is essential that the medical physicist verify that the processor is operating in accordance with the film manufacturer's specifications, not only to ensure quality mammography and because sensitometric testing is an MQSA stipulation, but also because the FDA inspector will conduct such a verification during the annual inspection.
The first step in setting up a processor QC program is to establish sensitometric operating levels.
Although the differences are small, they can result in inconsistencies in the sensitometric readings from one batch to the next.
These curves also are called characteristic curves or sensitometric curves.
Thus, image creation and modification simply is a process of placing the subject part in the best position on the sensitometric curve to achieve the best possible contrast.
In reality, everything we do is based on the sensitometric outcome.