Aims and objectives
When X-rays penetrate the patient,
scattered radiation is generated.
The scattered radiation recorded by the X-ray detector is a slowly varying background signal accompanied by noise,
superimposed on top of the primary image signal.
While the primary signal provides the diagnostically important information,
the scatter signal mainly reduces primary contrast and causes the image to appear flat,
with the risk of obscuring diagnostic information (Fig.
1-3). Anti-scatter grids are a conventional...
Methods and materials
Radiographs of a thorax phantom (Chest Phantom “Lungman”,
4) were acquired on a portable flat detector at 90 kV tube voltage (DigitalDiagnost,
By using up to two additional chest plates with the phantom,
the varying scatter conditions in three different patient sizes could be simulated. Three aluminum discs (diameter: 10mm) were positioned in the lung (thickness: 2mm),
the retrocardial (thickness: 5mm) and the...
The contrast improvement factors obtained with a grid depend both on the phantom size and on the position within the thorax (Table 1).
For each phantom size,
the contrast improvement is highest in the abdominal area,
where the fraction of scattered radiation is highest.
The CIF of a particular area increases with the phantom size. The contrast improvement factors obtained with the software-based scatter correction agree well with those obtained with the grid,
both for the different anatomical...
Using the scatter correction software,
the image contrast of a non-grid image can be restored to that of a grid image for different chest phantom sizes.
software scatter correction may have the potential to allow for grid-less image acquisition in mobile chest radiography with an image quality approaching that of grid images.
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