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5 paź 2020 · In reality, the scan data are 100 percent perfect due to multiple physical effects like scatter radiation, pixel noise and approximation in the reconstruction algorithms. A good rule of thumb is to use 1/10 of the voxel size is the accuracy of the surface on a decent CT scan.
- Understanding The Metrology Language for X-ray Computed Tomography
Interest is growing across many industries in the use of...
- Computed Tomography for NDT
For Medical CT and a few other special industrial...
- Understanding The Metrology Language for X-ray Computed Tomography
1 gru 2015 · The purpose of this review is to present the spectrum of various methods that have been used to characterise image quality in CT: from objective measurements of physical parameters to clinically task-based approaches (i.e. model observer (MO) approach) including pure human observer approach.
The Computed Tomography (CT) Scanner Task Group was formed to pro-vide a reference document of suggested procedures for acceptance testing of CT systems for clinical medical physicists.
2 lis 2023 · CT scans use a kVp of around 120, although this can range from 70-140. An increased kVp increases the dose in CT imaging. Increasing kVp also increases noise, although this might be necessary for troubleshooting metal artifacts and imaging osseous structures.
20 sie 2019 · Common detector arrays accommodate scanning of 80 to 160 mm of coverage in a single tube rotation, with resolution of 0.5 to 0.6 mm, so that entire sections of patient anatomy can be captured in a single revolution of the CT scanner’s rotating frame, taking less than 1 second.
11 sty 2024 · Computed tomography (CT), also known as, especially in the older literature and textbooks, computerized axial tomography (CAT), is an imaging modality that uses x-rays to build cross-sectional images ("slices") of the body.
Precision (noise), contrast scale, linearity, accuracy, spatial independence, spatial resolution, artifacts, reproducible performance, and patient exposure are several parameters discussed, as are problems of measurement with regard to non-water bath scanners.
