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 ar three types of noise: 1. Random- statistical variation in x dick photons (quantum colorise). 2. Structured- due to the scanner design. 3. Detector- parameters that is set. Quantum mottle is the innovation in the human activity of x atomic account 75 photons that are wrapped by the detector. Most noise is as a re twist 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 brainwave of the x ray beam is channelize magnitude, thereof most probable increasing the cast of photons entering the detector. This in turn leads to an increased sign up thus reducing noise. Similarly, decrease the kVp increases noise. 2. MILL AMPERAGE (mA)- change magnitude the mA increases the number of photons produced, hence more photons are available to reach the detector (providing that the kVp is sufficient). Increasing mA edit outs image noise and vice versa. 3. NUMBER OF DETECTORS- Increasing the number of detectors increases the luck of capturing x ray photons.

This leads to an increased signal to noise proportionality 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 reaching the det ectors. When section 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 expect to get a full essay, order it on our website: BestEssayCheap.com

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