Dose optimization for assessment of periodontal structures in cone beam CT examinations

Abstract

For a dedicated CBCT unit, changing the rotation angle from 360° to 180° degrades image quality. By altering tube potential and current for the 360° rotation protocol, assessment of periodontal structures can be performed with a smaller dose without substantially affecting visualization.

In vitro diagnostic accuracy of low‐dose CBCT for evaluation of peri‐implant bone lesions

“…Moreover, LD‐CBCT image quality was considered sufficient for various orthodontic diagnostics (Brown, Scarfe, Scheetz, Silveira, & Farman, ; Cook, Timock, Crowe, Wang, & Covell, ; Hidalgo Rivas, Horner, Thiruvenkatachari, Davies, & Theodorakou, ; Ludlow & Walker, ; Portelli et al, ), for tooth autotransplantation planning (EzEldeen et al, ), and for preimplant radiographic assessment (Liljeholm et al, ). Although no dedicated LD‐CBCT protocols have yet been tested, there is evidence from the field of endodontics and periodontology demonstrating acceptable image quality with reduced kV, mA, and exposure time (Al‐Okshi, Theodorakou, & Lindh, ; Jones, Mannocci, Andiappan, Brown, & Patel, ; Lagos de Melo et al, ). Finally, in a bovine rib model, diagnostic accuracy of three customized CBCT protocols were compared regarding peri‐implant fenestrations and deshiscences.…”

“…Most likely, these outliers are attributed to individual measurement errors (EzEldeen et al, 2017), and for preimplant radiographic assessment (Liljeholm et al, 2017). Although no dedicated LD-CBCT protocols have yet been tested, there is evidence from the field of endodontics and periodontology demonstrating acceptable image quality with reduced kV, mA, and exposure time (Al-Okshi, Theodorakou, & Lindh, 2017;Jones, Mannocci, Andiappan, Brown, & Patel, 2015;Lagos de Melo et al, 2017). Finally, in a bovine rib model, diagnostic accuracy of three customized CBCT protocols were compared regarding periimplant fenestrations and deshiscences.…”

Measurability and reliability of assessments of root length and marginal bone level in cone beam CT and intraoral radiography: a study of adolescents

“…The CBCT unit used offered four predefined scan modes with possibilities to change the mA-and kV-settings and dimension of FOV. As recommended by Al-Okshi et al, 17 full rotation with 80 kV and modified mA to 3 according to patient size was used to obtain optimal subjective image quality for assessment of periodontal structures. As a low exposure (3 mA) was used, full rotation was chosen in order to improve the signalto-noise ratio.…”

Age as a limiting factor for panoramic imaging in patients with ectopic maxillary canines

“…3 Using small fields of view and altering tube potential and current for the 360 rotation protocol, assessment of periodontal structures can be performed with a smaller dose without substantially affecting visualization. 4 There is great potential for dose reduction through mA with a minimal loss in image quality, 5 and CBCT scanners can be optimized by using of the highest kV along with the shortest exposure time and a task-specific mA. 6 Because there is only 1 small area of interest in these cases, a field of view of 4 3 4 cm may be sufficient.…”

“…Even at similar effective dose level for a conventional panoramic examination, the child doses are reported to be greater than adult doses owing to the increased radiosensitivity of tissues in children. 4 Also, the cumulative dose for children with dental anomalies, such as impacted canines, is significantly higher than other groups of children exposed to CBCT owing to usually multiple exposures and higher number of CBCT examinations compared with other pathologic conditions. 5 Therefore, minimizing both the effective dose as well as the cumulative radiation dose in children is essential.…”