DOC. NO.: JDP-013-CUBEX
Issued Date: 2017.07.21
Revision: 2017.07.21(Rev.0)
20/54 Page
1.6.5 Operating principle
A radiograph is an X-ray image obtained by placing a part of the patient in front of an X-ray
detector and then illuminating it with a short X-ray pulse. To take an X-ray image, the
operator sets the patient in front of the detector and sets the parameter values of the high
voltage generator to control the intensity of X-ray for each body part. When the operator
presses the exposure switch, a high voltage from the generator is supplied to the X-ray tube.
X-rays from the tube are emitted to the patient. The part of the patient to be X-rayed is
placed between the X-ray source and the detector to produce a shadow of the internal
structure of that particular part of the body. X-rays are partially blocked by dense tissues
such as bone, and pass more easily through soft tissues. This causes bones to appear
lighter than the surrounding soft tissue and it makes contrast of the image. The detector
changes the X-rays coming through the part of the patient to digital signals and makes digital
images. The software in the PC provides the operator with various features to manipulate
the images and shows the images to a doctor to diagnose the patient on the monitor.
1.6.6 Limit of use
The device should be operated by the personnel who are qualified by the hospital authority.
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