High performance X-ray unit, e.g. greater
than 150 mA output.
Good quality films and screens; rare
earth films and screens will help to reduce exposure time.
Automatic processing greatly reduces
processing time and minimises processing faults. This will not compensate for
poor radiographic technique or a low-power unit.
Good positioning for which a selection
of restraining and positioning devices are required such as sandbags, foam shapes
(the wedge is most commonly used), ties, positioning troughs.
Good centring and coning down with the
light beam diaphragm to minimise scatter radiation and thus improve contrast
General anaesthesia with the lungs temporarily
inflated (tidal volume) allows elimination of movement blur and demonstration
of good lung detail (maximising air to soft tissue contrast).
Although the use of grids will reduce
scatter radiation, the increased exposure time required will increase movement
blur and so grids are probably better avoided with low-output units.
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