A new volumetric CT machine for dental imaging based on the cone-beam technique: preliminary results

Mozzo, P.; Procacci, Carlo; Tacconi, A.; Martini, Paolo Tinazzi; Andreis, I. A. Bergamo

doi:10.1007/s003300050586

Cited by 1,133 publications

(846 citation statements)

References 12 publications

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“…Considering the technological progress of the devices and the different dosimetric techniques, these results are very close to those obtained by more recent studies [6,7]. In our experience, the dose value obtained and summarised in Table 3 are significantly lower than the minimum values reported in the literature.…”

Section: Discussionsupporting

confidence: 90%

“…Recently, a new dedicated machine has been introduced for extraoral digital imaging of the dental arches, based on the use of a radiant cone beam (cone beam computed tomography, CBCT). This technique was developed as an alternative to conventional CT in volumetric dental studies in order to reduce operating costs and the radiation dose administered to the patient [7]. The aim of our study was to demonstrate that the use of a lower kilovoltage alone in a Dentascan exam performed with multislice spiral CT may strongly decrease the dose delivered to the main anatomic structures of the head and neck without altering the diagnostic accuracy of the image obtained.…”

Section: Introductionmentioning

confidence: 99%

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Multidetector CT and Dentascan software: dosimetric evaluation and technique improvement

et al. 2006

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Purpose. The development of new operative techniques in oral and maxillofacial surgery within the last few years has led to an increasing demand for Dentascan examination, also in paediatric patients. It is necessary to modify acquisition parameters to reduce the absorbed dose. The aim of this study was to define a Dentascan protocol in which a reduced X-ray dose could be used. Materials and methods. Dosimeters were applied to the eyes, mouth, parotid glands, thyroid and back of the neck of an anthropomorphic Plexiglas phantom that underwent multidetector computed tomography (MDCT) Dentascan examinations. Both 120kV and 80 kV were used to study the mandibular and maxillary arches. Results. Examinations obtained with the 80 kV protocol showed a ten-fold reduction in the absorbed dose, without affecting image quality. Conclusions. We suggest a Dentascan protocol that reduces the Xray dose administered to the patient while ensuring the same high diagnostic accuracy. Key words

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Multidetector CT and Dentascan software: dosimetric evaluation and technique improvement

et al. 2006

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“…Early dedicated CBCT scanners for dental use were characterized by Mozzo et al 20 and Arai et al 21 in the late 1990s. Since then, more commercial models have become available, inciting research in many fields of dentistry and oral and maxillofacial surgery.…”

Section: Dentomaxillofacial Imagingmentioning

confidence: 99%

Conebeam CT of the Head and Neck, Part 2: Clinical Applications

Miracle¹,

Mukherji²

2009

AJNR Am J Neuroradiol

301

207

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SUMMARY: Conebeam x-ray CT (CBCT) is being increasingly used for point-of-service head and neck and dentomaxillofacial imaging. This technique provides relatively high isotropic spatial resolution of osseous structures with a reduced radiation dose compared with conventional CT scans. In this second installment in a 2-part review, the clinical applications in the dentomaxillofacial and head and neck regions will be explored, with particular emphasis on diagnostic imaging of the sinuses, temporal bone, and craniofacial structures. Several controversies surrounding the emergence of CBCT technology will also be addressed. C onebeam CT (CBCT) is an advancement in CT imagingthat has begun to emerge as a potentially low-dose crosssectional technique for visualizing bony structures in the head and neck. The physical principles, image quality parameters, and technical limitations relevant to CBCT imaging were discussed in Part 1 of this 2-part series. The second part presented here will highlight the evidence related to CBCT applications in head and neck as well as dentomaxillofacial imaging. Controversial aspects of this technology will also be addressed, including limitations in image quality and its often officebased operational model.CBCT was first adapted for potential clinical use in 1982 at the Mayo Clinic Biodynamics Research Laboratory. 1 Initial interest focused primarily on applications in angiography in which soft-tissue resolution could be sacrificed in favor of high temporal and spatial-resolving capabilities. Since that time, several CBCT systems have been developed for use both in the interventional suite and for general applications in CT angiography. 2,3 Exploration of CBCT technologies for use in radiation therapy guidance began in 1992, 4,5 followed by integration of the first CBCT imaging system into the gantry of a linear accelerator in 1999. 6 The first CBCT system became commercially available for dentomaxillofacial imaging in 2001 (NewTom QR DVT 9000; Quantitative Radiology, Verona, Italy). Comparatively low dosing requirements and a relatively compact design have also led to intense interest in surgical planning and intraoperative CBCT applications, particularly in the head and neck but also in spinal, thoracic, abdominal, and orthopedic procedures. [7][8][9][10][11] Diagnostic applications in CT mammography and head and neck imaging are also under evaluation. 12-14 The technical and clinical considerations pertaining to CBCT imaging in many of these applications have been the subjects of several recent reviews. [15][16][17][18][19] The recent review by Dörfler et al 16 of the neurointerventional applications of CBCT is of particular interest to the field of neuroradiology.The discussion below will focus on the diagnostic and treatment-planning applications of CBCT in dentomaxillofacial and head and neck imaging. Commercially available CBCT systems for dentomaxillofacial imaging include the CB MercuRay and CB Throne (Hitachi Medical, Kashiwi-shi, Chiba-ken, Japan), 3D Accuitomo products (J. Mor...

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“…9,10 CBCT scanners use back-projection reconstructed tomography to acquire data of the area of interest through a single or partial rotation of the conical X-ray beam and reciprocal image receptor. Remarkably, in most systems scan times of less than 20 seconds may be achieved using commonly available personal computers to process the data.…”

Section: Cone Beam Computed Tomographymentioning

confidence: 99%