Digital Radiography

Figure 1: Chest X-ray. Bone (collar bone and back) appears light grey. Air (lungs and stomach gas) appears dark grey.

Radiography is the imaging of body structures using X-rays. X-rays are a form of radiation similar to visible light, radiowaves and microwaves. X-radiation is special because it has a very high energy level that allows the X-ray beam to penetrate through the body and create an image or picture. The image is created due to the X-ray beam being absorbed differently by different parts or structures in the body. A dense structure like bone absorbs a high percentage of the X-ray beam (which appears light grey on the image), whilst low density structures like soft tissues absorb a small percentage (which appears dark grey on the image). The body has many different structures of varying densities and this difference creates a picture or image (figure 1).

At Lime Radiology, we use the state of the art GE direct digital equipment. X-rays are detected by GE’s patented crystal detection system and digitized directly. The system requires significantly less radiation than the original photographic film or CR with better image quality. The system is much more tolerant of exposure variations reducing, if not almost completely eliminating, the need for repeat films. It also has a highly sophisticated automatic exposure control system ensuring the minimum amount of radiation is used for each and every examination.

Being a native digital system, the images can be manipulated easily by computers to allow assessment of even the finest details which might not be seen on the other methods.