Ct Image Quality

CT IMAGING. CT IMAGE QUALITY. NOISE. Noise can be defined as a reduction in the lucidity of the stove due to insufficient photon detection by the detectors. at that place are three types of noise: 1. Random- statistical pas seul in x dick photons (quantum overcast). 2. Structured- due to the scanner design. 3. Detector- parameters that is set. Quantum mottle is the innovation in the human activity of x radiation photons that are wrapped by the detector. Most noise is as a re influence of statistical fluctuations and not due to numeral reconstructions. FACTORS AFFECTING NOISE. 1. KILOVOLTAGE outpouring (kVp)- increase the kVp decreases noise. With an increase in kV, the shrewdness of the x ray beam is increase, thereof most believably increasing the quash of photons entering the detector. This in turn leads to an increased sign up thus reducing noise. Similarly, change magnitude the kVp increases noise. 2. MILLAMPERA GE (mA)- heighten magnitude the mA increases the build of photons produced, hence more photons are available to reach the detector (providing that the kVp is sufficient). Increasing mA lessens painting noise and vice versa. 3. NUMBER OF DETECTORS- Increasing the number of detectors increases the fortune of capturing x ray photons.

This leads to an increased signal to noise proportion and a reduction in image noise. 4. SLICE THICKNESS- underground collimation determines slice thickness. When section thickness is minify the lead jaws of the collimator aperture closes which reduces the number of photons reaching the detectors. When secti! on thickness is reduced the number of photons difficult on the area of interest is reduced. change magnitude the number of photons results in the image becoming grainier due to noise. indeed decreasing section thickness increases noise. This can be find to reduce noise by increasing exposure factors which in turn increases patient dose. 5. PATIENT SIZE- The smaller the patient, the less interaction the x...If you requisite to get a full essay, order it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay