SU-E-I-10: Putting Teeth into Your CT Dosimetry Program: Approaches to Cone- Beam Dental/Maxillofacial CT Dosimetry

Medical Physics
T BlackburnJ A Anderson

Abstract

To review and compare different approaches to the problem of dosimetry for limited field-of-view (FOV) cone beam CT devices for dental and maxillofacial applications. The determination of patient doses from specialized, cone-beam CT devices for dental and maxillofacial work requires medical physicists to re-evaluate their dosimetry methods. These devices work in cone-beam geometry, with an axial field dimension on the order of the lengths of the standard head CTDI phantom and pencil ionization chamber. They may also utilize less than 360 degree scans, resulting in asymmetrical radiation distributions. This operating regime is far from that for which conventional CT dosimetry was designed, and alternative approaches must be considered. The alternatives include extensions of conventional CT dosimetry currently used for large axial FOV scanners (e.g. the extended CTDI parameter (CTDIe) for the Toshiba Aquillion One with 160 mm axial FOV) and the new method based on point dosimetry measurements recently formalized in AAPM Report TG-111. Conventional, modified-conventional, and TG-111 dosimetry measurements are used in two CT dose phantoms (adult head and pediatric head) to obtain dose indices for the Planmeca ProMax 3D Max dental C...Continue Reading

Citations

Sep 12, 2019·Dental press journal of orthodontics·Guilherme ThiesenKi Beom Kim
Jul 3, 2018·Imaging Science in Dentistry·Lucía BarbaAlejandro Hidalgo
Jul 7, 2017·Imaging Science in Dentistry·Marcus Vinicius Linhares de OliveiraJoana Santos
Feb 27, 2015·Dental press journal of orthodontics·Daniela G GaribGuilherme Janson
Aug 19, 2015·The British Journal of Radiology·Jose A Hidalgo RivasChrysoula Theodorakou

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