Browsing by Author "Johnson, Brandon"

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    Pediatric Phantom Dosimetry of Kodak 9000 Cone-beam Computed Tomography
    (American Academy of Pediatric Dentistry, 2017-05) Yepes, Juan F.; Booe, Megan R.; Sanders, Brian J.; Jones, James E.; Ehrlich, Ygal; Ludlow, John B.; Johnson, Brandon; Pediatric Dentistry, School of Dentistry
    Purpose: The purpose of the study was to evaluate the radiation dose of the Kodak 9000 cone-beam computed tomography (CBCT) device for different anatomical areas using a pediatric phantom. Methods: Absorbed doses resulting from maxillary and mandibular region three by five cm CBCT volumes 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 and mandibular examinations were calculated following the 2007 recommendations of the International Commission on Radiological Protection (ICRP). Results: Of the mandibular scans, the salivary glands had the highest equivalent dose (1,598 microsieverts [μSv]), followed by oral mucosa (1,263 μSv), extrathoracic airway (pharynx, larynx, and trachea; 859 μSv), and thyroid gland (578 μSv). For the maxilla, the salivary glands had the highest equivalent dose (1,847 μSv), followed closely by oral mucosa (1,673 μSv), followed by the extrathoracic airway (pharynx, larynx, and trachea; 1,011 μSv) and lens of the eye (202 μSv). Conclusion: Compared to previous research of the Kodak 9000, completed with the adult phantom, a child receives one to three times more radiation for mandibular scans and two to 10 times more radiation for maxillary scans.
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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.