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 fluctuation in x dick photons (quantum mottle).
2. Structured- due to the scanner design.
3. Detector- parameters that is set.
Quantum mottle is the innovation in the human activity of x ray photons that are wrapped by the detector.
Most noise is as a return of statistical fluctuations and not due to mathematical reconstructions.

FACTORS AFFECTING NOISE.
1. KILOVOLTAGE outpouring (kVp)- increase the kVp decreases noise. With an increase in kV, the penetration of the x ray beam is increased, thereof most likely increasing the number of photons entering the detector. This in turn leads to an increased sign up thus reducing noise. Similarly, decreasing the kVp increases noise.

2. MILLAMPERAGE (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 reduces 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 ratio and a reduction in image noise.

4. SLICE THICKNESS- 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 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 want to get a full essay, order it on our website: Orderessay



If you want to get a full essay, wisit our page: write my essay .