Effective dose range for dental cone beam computed tomography scanners

Pauwels, Ruben; Beinsberger, Jilke; Collaert, Bruno; Theodorakou, Chrysoula; Rogers, Jessica; Walker, Anne; Cockmartin, Lesley; Bosmans, Hilde; Jacobs, Reinhilde; Bogaerts, Ria; Horner, Keith

doi:10.1016/j.ejrad.2010.11.028

Cited by 532 publications

(459 citation statements)

References 18 publications

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“…In a comparison between effective radiation dose of CBCT and Multislice CT (MSCT) scanners for dental and maxillofacial applications, effective dose values ranged from 13 to 82 lSv for CBCT and from 474 to 1160 lSv for MSCT [5]. Similar data concerning a significant decrease in radiation dose values have been reported elsewhere [4,6]. Considering the number of scans or radiographic examinations obtained in a typical ACIF procedure, from initial diagnosis through the end of treatment, it seems prudent then to limit the patient's exposure and therefore obviate the potentially deleterious effects of radiation exposure.…”

Section: Discussionsupporting

confidence: 77%

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Cone-beam CT to assess bony fusion following anterior cervical interbody fusion

et al. 2015

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Purpose Assessment of bony fusion following anterior cervical interbody fusion (ACIF) is usually done by plain film or CT. We present the first clinical application of Cone-Beam CT (CBCT) to evaluate bony fusion after ACIF. Methods A 56-year-old man with disc herniation at C6-C7 underwent ACIF surgery using a compressed nanocrystalline hydroxyapatite interbody device (nanOss-C, Pioneer Surgical Marquette, MI, USA) and a nanocrystalline hydroxyapatite bone graft filler (nanOss Bioactive, Pioneer Surgical Marquette, MI, USA). Imaging follow-up was performed by CBCT (NewTom 5G, QR Srl, Verona, Italy) at 1 day, 6 weeks, 3 and 9 months postoperatively. Two independent assessors quantitatively measured the greyscale changes of the bone graft filler and qualitatively evaluated the bony fusion process. Results Quantitative analysis of the images showed a steadily increasing matrix density of the bone graft filler over the 9 months follow-up, suggesting increasing calcification. Qualitative evaluation demonstrated different stages of the bone fusion process within the disc space around the cage, at the interface between cage and endplates, and at the interface between bone graft filler and the endplates.Conclusions CBCT provides high-resolution cross-sectional imaging of the cervical spine after ACIF. For the first time, in vivo evaluation of the bone graft filler within the centre of the circumferentially radiodense cage and detailed cross-sectional evaluation of bone fusion was achieved. Confirmation of these promising outlooks of CBCT in a large cohort of ACIF patients is needed with regard to routine clinical application and evaluation of different interbody devices.

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Section: Discussionsupporting

confidence: 77%

“…CBCT was first developed as a tool for clinical use in 1982 at the Mayo Clinic Biodynamics Research Laboratory [2]. In the intervening years, several CBCT systems have been developed for use both in the interventional suite as well as the originally intended general applications such as CT angiography [3,4].…”

Section: Introductionmentioning

confidence: 99%

Cone-beam CT to assess bony fusion following anterior cervical interbody fusion

et al. 2015

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“…To date, most studies concerning effective dose assessment have used thermoluminescent dosimeters (TLD) in combination with anthropomorphic phantoms 2 , 3 , 4 , 5 , 6 , 7 . The low‐dose limit of TLDs when using single exposure (0.3 mGy) 8 , 9 has been considered adequate in most applications and has, therefore, been used as the reference low‐dose limit in MOSFET uncertainty assessment in this study.…”

Section: Introductionmentioning

confidence: 99%

Characterization of MOSFET dosimeters for low‐dose measurements in maxillofacial anthropomorphic phantoms

Koivisto

Wolff

Kiljunen

et al. 2015

J Applied Clin Med Phys

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The aims of this study were to characterize reinforced metal‐oxide‐semiconductor field‐effect transistor (MOSFET) dosimeters to assess the measurement uncertainty, single exposure low‐dose limit with acceptable accuracy, and the number of exposures required to attain the corresponding limit of the thermoluminescent dosimeters (TLD). The second aim was to characterize MOSFET dosimeter sensitivities for two dental photon energy ranges, dose dependency, dose rate dependency, and accumulated dose dependency. A further aim was to compare the performance of MOSFETs with those of TLDs in an anthropomorphic phantom head using a dentomaxillofacial CBCT device. The uncertainty was assessed by exposing 20 MOSFETs and a Barracuda MPD reference dosimeter. The MOSFET dosimeter sensitivities were evaluated for two photon energy ranges (50–90 kVp) using a constant dose and polymethylmethacrylate backscatter material. MOSFET and TLD comparative point‐dose measurements were performed on an anthropomorphic phantom that was exposed with a clinical CBCT protocol. The MOSFET single exposure low dose limit (25% uncertainty, normalk=2) was 1.69 mGy. An averaging of eight MOSFET exposures was required to attain the corresponding TLD (0.3 mGy) low‐dose limit. The sensitivity was 3.09±0.13 mV/mGy independently of the photon energy used. The MOSFET dosimeters did not present dose or dose rate sensitivity but, however, presented a 1% decrease of sensitivity per 1000 mV for accumulated threshold voltages between 8300 mV and 17500 mV. The point doses in an anthropomorphic phantom ranged for MOSFETs between 0.24 mGy and 2.29 mGy and for TLDs between 0.25 and 2.09 mGy, respectively. The mean difference was −8%. The MOSFET dosimeters presented statistically insignificant energy dependency. By averaging multiple exposures, the MOSFET dosimeters can achieve a TLD‐comparable low‐dose limit and constitute a feasible method for diagnostic dosimetry using anthropomorphic phantoms. However, for single in vivo measurements (<1.7 mGy) the sensitivity is too low.PACS number: 87.50.wj

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“…Guidelines for dental radiography are shown in Table 1. Multi-slice CT may deliver equivalent resolution from equivalent dose compared to CBCT 56 but it has also been stated CBCT can deliver reduced effective dose 57 (Table 2 58 ). Both CT and CBCT can have an adjustable Field of View (FoV).…”

Section: Ultraviolet (Uv) (Wavelength Of 10 -8 To 4 X 10 -7 M)mentioning

confidence: 99%