Browsing by Subject "radiation dose"

Now showing 1 - 3 of 3
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    Dual-Energy CT and Radiation Dose
    (Elsevier, 2020-01) Reher, Thomas; Radiology and Imaging Sciences, School of Medicine
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    Pediatric phantom dosimetry using a hand-held portable dental radiology device
    (MedDocs, 2020) Bozic, Zachary D.; Yepes, Juan F.; Jones, James E.; Sanders, Brian J.; Vinson, LaQuia; Johnson, Brandon; Pediatric Dentistry, School of Dentistry
    Background: The purpose of the study was to evaluate the radiation dose of the NOMAD Pro 2 device for different anatomical areas using a pediatric phantom. Methods: Absorbed doses resulting from a maxillary anterior occlusal and bitewing projections of an anthropomorphic 10-year-old child phantom were acquired using optical stimulated dosimetry. Equivalent doses were calculated for radiosensitive tissues in the head and neck area, and effective dose for maxillary anterior occlusal and bitewing examinations were calculated following the 2007 recommendations of the International Commission on Radiological Protection (ICRP). In addition, the effective dose of backscatter radiation to the operator was recorded. Results: Of the anterior occlusal scans, the salivary glands had the highest equivalent dose, followed by oral mucosa extra thoracic airway and thyroid gland. For the bitewing projection scan, the salivary glands had the highest equivalent dose followed closely by the oral mucosa. The operator had minimal recorded dose. Conclusion: Compared to previous research, completed with the adult phantom, a child receives less radiation for bitewing and anterior occlusal projections using a hand-held portable device than when a traditional wall mounted device is utilized.
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    Use of a Knowledge-based Iterative Reconstruction Technique, IMR, to Improve Image Quality and Lower Radiation Dose
    (Anderson, 2019) Hameed, Tariq A.; Radiology and Imaging Sciences, School of Medicine
    Use of IMR in Clinical Practice IMR is used in a variety of ways in our practice. Since our department has already reduced radiation dose as part of standard practice, we use IMR to improve the image quality at a given radiation dose. [...]we use IMR for CT angiography (CTA) examinations that require high contrast and high spatial resolution; in these cases, IMR is useful to reduce section thickness and lower noise (Case 5). Because IMR images are virtually noise free, they appear different from iDose4 images. [...]in the initial stages, reviewing images side-by-side with both reconstruction techniques may help to achieve familiarity with the new technique. The dissection flap (red arrow) is also more sharply delineated from the surrounding true and false lumen on the IMR image (C). [...]using the same CT examination, but 2 different processing techniques, it is apparent that with IMR, there is better contrast resolution between the lesion and the surrounding parenchyma, improving the sensitivity for lesion detection and providing better visualization of the abnormality, compared to iDose4.