Understanding NRT- Reading 1- 2 of 2- Radiogaphic Testing A
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
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Definition<br />
Besides radiographic contrast as a subjective criteria for determining<br />
radiographic quality, there exists one other, radiographic detail. Essentially,<br />
radiographic definition is the abruptness <strong>of</strong> change in going from one density<br />
to another. For example, it is possible to radiograph a particular subject and,<br />
by varying certain factors, produce two radiographs which possess different<br />
degrees <strong>of</strong> definition.<br />
In the example to the left, a two-step step tablet with the transition from step<br />
to step represented by Line BC is quite sharp or abrupt. Translated into a<br />
radiograph, we see that the transition from the high density to the low density<br />
is abrupt. The Edge Line BC is still a vertical line quite similar to the step<br />
tablet itself. We can say that the detail portrayed in the radiograph is<br />
equivalent to physical change present in the step tablet. Hence, we can say<br />
that the imaging system produced a faithful visual reproduction <strong>of</strong> the step<br />
table. It produced essentially all <strong>of</strong> the information present in the step tablet<br />
on the radiograph.<br />
Charlie Chong/ Fion Zhang
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