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The addition of computer simulated noise to investigate radiation dose and image quality in images with spatial correlation of statistical noise: an example application to X-ray CT of the brain

Departments of Medical Physics and Diagnostic Radiology, St George's Healthcare NHS Trust, London SW17 0QT, UK

View larger version (142K): [in a new window]   Figure 1. CT transaxial slice showing typical positions of regions of interest (ROI) for the periventricular low density lesion (PVLD) areas and the ventricles.

View larger version (12K): [in a new window]   Figure 2. Statistical noise (standard deviation of CT number) from ventricular regions measured in a single image and from the result of subtraction between an image pair. The error bars represent a coefficient of variation of 5.4%.

View larger version (15K): [in a new window]   Figure 3. Statistical noise (standard deviation of CT number) from ventricular regions in single images versus noise in adjacent periventricular low density lesion (PVLD) regions measured from subtracted image pairs. The error bars represent a coefficient of variation of 5.4%. ROI, region of interest.

View larger version (13K): [in a new window]   Figure 4. Statistical noise (standard deviation of CT number) in ventricular regions measured from images acquired at 300 mAs, and simulated at 300 mAs based on original images at 420 mAs. The error bars represent a coefficient of variation of 5.4%.