X-rays are a form of electromagnetic radiation, just like visible light. In a health care setting, a machines sends individual x-ray particles through the body. A computer or special film is used to record the images that are created.
Structures that are dense (such as bone) will block most of the x-ray particles, and will appear white. Metal and contrast media (special dye used to highlight areas of the body) will also appear white. Structures containing air will be black, and muscle, fat, and fluid will appear as shades of gray.
The test is performed in a hospital radiology department or in the health care provider's office by an x-ray technologist. The positioning of the patient, x-ray machine, and film depends on the type of study and area of interest. Multiple individual views may be requested.
Much like conventional photography, motion causes blurry images on radiographs, and thus, patients may be asked to hold their breath or not move during the brief exposure (about 1 second).
Date of issue : 29/05/1995
Denomination : Se-tenant pair 30sen & RM1.00
Stamps Designer : Eka IPR Agensi
Printer : Security Printers (M) SDN BHD
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