Ct Image Quality

CT IMAGING. CT IMAGE QUALITY. NOISE. Noise can be defined as a reduction in the limpidity of the stove due to insufficient photon detection by the detectors. at that place ar three types of noise: 1. Random- statistical version in x dick photons (quantum obnubilate). 2. Structured- due to the scanner design. 3. Detector- parameters that is set. Quantum mottle is the innovation in the human activity of x irradiate photons that are wrapped by the detector. Most noise is as a re make for of statistical fluctuations and not due to numerical reconstructions. FACTORS AFFECTING NOISE. 1. KILOVOLTAGE outpouring (kVp)- increase the kVp decreases noise. With an increase in kV, the perspicacity of the x ray beam is increase, thereof most seeming increasing the moment of photons entering the detector. This in turn leads to an increased sign up thus reducing noise. Similarly, lessen the kVp increases noise. 2. MILLAMPERAGE (mA)- adjustment magnitude the mA increases the frame of photons produced, hence more photons are available to reach the detector (providing that the kVp is sufficient). Increasing mA cut offs picture show noise and vice versa. 3. NUMBER OF DETECTORS- Increasing the number of detectors increases the chance of capturing x ray photons.

This leads to an increased signal to noise ratio and a reduction in image noise. 4. SLICE THICKNESS- provide collimation determines slice thickness. When section thickness is minify the lead jaws of the collimator aperture closes which reduces the number of photons reac hing the detectors. When section thickness! is reduced the number of photons concentrated 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 sine qua non to get a full essay, order it on our website: BestEssayCheap.com

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