In this review we compare industrial and medical CT systems and describe some of the advantages (e.g., greater spatial and contrast resolution, geometric magnification, image quality and unsharpness
, longer scan times) and limitations (i.e., cabinet size, object size restrictions, reconstruction artifacts and noise) to using industrial CT systems for PMCT inspection of skeletal remains by forensic anthropologists.
The resolution and motion unsharpness
were assessed using the inbuilt line pair bar pattern, iodine targets, air cylinders, aluminum cylinders, and the moving wire targets.
Artifacts can be due to beam hardening (results in cupping artifact and streaks and dark bands), Patient-related artifacts (Patient motion resulting in unsharpness
of the reconstructed image), Scanner-related artifacts (circular or ring-shaped) and cone beam-related artifacts (partial volume averaging, undersampling, and cone-beam effect) (21).
The biggest cause of 'unsharpness
' is not poor lens quality, but camera movement during exposure.
Due to the insensitivity of the human eyes to unsharpness
or blurriness within the DOF of the lens, only the objects within the DOF appear to be in focus while objects out of the DOF are blurred .
Patient motion can cause misregistration of data, which appears as unsharpness
in the reconstructed image.
Dental roentgenography I: an investigation in adumbration or the factors that control geometric unsharpness
. J Am Dent Assoc.
Fuzzy system is introduced to deal with the issue of uncertainty and unsharpness
of collected data.
The assignment consists of designing a laboratory experiment that demonstrates an influencing factor on 1 of the major radiographic quality factors (eg, motion unsharpness
and its influence on definition).
can be improved by using a tube with a smaller focal spot size or reducing the magnification.