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By Lois E. Romans
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Extra info for Computed tomography for technologists
Collimation Collimators restrict the x-ray beam to a specific area, thereby reducing scatter radiation. Scatter radiation reduces image quality and increases the radiation dose to the patient. Reducing the scatter improves contrast resolution and decreases patient dose. Collimators control the slice thickness by narrowing or widening the x-ray beam. The source collimator is located near the x-ray source and limits the amount of x-ray emerging to thin ribbons. Because it acts on the x-ray beam before it passes through the patient it is sometimes referred to as prepatient collimation.
It is accessible to the CPU without the use of the computer’s input/output channels. Primary memory is used to store data that are likely to be in active use. Primary storage is typically very fast. ROM is imprinted at the factory and is used to store frequently used instructions such as those required for starting the system. RAM includes instructions that are frequently changed, such as the data used to reconstruct images. RAM is so named because all parts of it can be reached easily at random.
A xenon detector channel consists of three tungsten plates. When a photon enters the channel, it ionizes the xenon gas. These ions are accelerated and amplified by the electric field between the plates. The collected charge produces an electric current. This current is then processed as raw data. A disadvantage of xenon gas is that it must be kept under pressure in an aluminum casing. This casing filters the x-ray beam to a certain extent. Loss of x-ray photons in the casing window and the space taken up by the plates are the major factors hampering detector efficiency.