Ct Image Quality

CT IMAGING. CT IMAGE QUALITY. NOISE. Noise can be defined as a reduction in the clarity of the stove due to insufficient photon detection by the detectors. at that place are three types of noise: 1. Random- statistical version in x dick photons (quantum streak). 2. Structured- due to the scanner design. 3. Detector- parameters that is set. Quantum mottle is the innovation in the human activity of x jibe photons that are wrapped by the detector. Most noise is as a re treat of statistical fluctuations and not due to numeric reconstructions. FACTORS AFFECTING NOISE. 1. KILOVOLTAGE outpouring (kVp)- increase the kVp decreases noise. With an increase in kV, the brainstorm of the x ray beam is alternate magnitude, thereof most seeming increasing the total 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. MILLAMPERAGE (mA)- change magnitude the mA increases the follow of photons produced, hence more photons are available to reach the detector (providing that the kVp is sufficient). Increasing mA mows image noise and vice versa. 3. NUMBER OF DETECTORS- Increasing the number of detectors increases the probability of capturing x ray photons.

This leads to an increased signal to noise symmetry and a reduction in image noise. 4. SLICE THICKNESS- thermionic vacuum tube 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 se! ction thickness is reduced the number of photons operose 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 wishing to get a full essay, order it on our website: BestEssayCheap.com

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