keskussäteen

keskussäteen is a Finnish term that translates to "central ray" in English. It is primarily used in the field of medical imaging, particularly in radiography and computed tomography (CT). The central ray refers to the imaginary line that represents the central axis of the X-ray beam emitted from the X-ray tube.

In diagnostic imaging, the correct positioning of the central ray is crucial for obtaining high-quality images and minimizing radiation dose to the patient. Radiographers carefully direct the central ray to the specific anatomical region of interest, ensuring that it passes through the center of the structure being examined. This precise alignment helps to achieve optimal image resolution and reduces the likelihood of image distortion or artifacts.

The angle and direction of the central ray are determined by the specific examination being performed and the patient's anatomy. For example, in a chest X-ray, the central ray is typically directed towards the mid-chest region. In a CT scan, multiple central rays are used in sequence to create cross-sectional images of the body. Understanding and controlling the central ray is a fundamental aspect of radiation safety and effective diagnostic imaging practice.