07-652 CDRAD radiography phantom

This product has been discontinued.

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07-652

Overview

Key Features

Image evaluation To evaluate the phantom image
the observer indicates the location of the second spot in each square. Correct indication proves that a contrast is actually seen At the transition from visible to invisible
it is difficult to decide in which corner the second spot islocated
and the response equals pure chance The line connecting the central spots with the smallest visible diameter and contrast is called the Contrast Detail (CD) Curve For comparison of the imaging performance of different systems
phantom images are made under identical conditions and evaluated by the same observer at the same time. The better system will produce an image in which smaller contrasts and details are visible. This results in a shift of the CD curve to the lower left part of the image. (See graph) In the detail (vertical) direction
the diameter of the holes increases step-wise and logarithmically from 0.3 to 8.0 mm. The image shows 15 rows of spots with increasing detailPhantom Description The CDRAD Phantom consists of a Plexiglas tablet with cylindrical holes of exact diameter and depth (tolerances: 0.02 mm) The radiographic image of the phantom provides information about the imaging performance of the whole system The image shows 225 squares: 15 rows and 15 columns In each square
either one or two spots (the images of the holes) are present. The first three rows show only one spot
while the other rows have two identical spots; one in the middle and one in a randomly chosen corner. (See graph) The optical densities of the spots are higher than the uniform background In the contrast (horizontal) direction
the depth of the holes increases logarithmically
and the image shows 15 columns of spots with increasing contrast Comparison of the performance of several observers is also possible. The better performing observer produces a CD curve more to the lower left part of the image"

Vertical Tabs

07-652 CDRAD radiography phantom

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