5.3. POSITION OF THE X-RAY PLATE OR SENSOR
The parallel technique, where applicable, provides more accurate images in terms of size compared to the bisecting
technique. A rectangular collimator, with 30 cm (12"), focus-skin distance, is always preferable to obtain better quality
pictures. To avoid exposing the image receiver only partly (whether it is a sensor or photostimulable phosphorus
plate system) an alignment device that gives rectangular collimators guidelines should be used. These lines are
usually given on the alignment ring.
- Parallel technique.
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