Patient dose in charge-coupled device-based full-mouth intraoral radiography

Abstract

Objectives. This study investigated the effect of the size of the sensitive area of the charge-coupled devices (CCD) used in digital intraoral radiographic systems on the patient effective dose in full-mouth radiographic examinations. Methods. The effective dose was assessed in full-mouth radiographic examinations using the bisecting angle technique, while assuming that CCD sensitivity is equivalent to that of E-speed film. The results were compared with the effective doses obtained using E-speed film. The tube potentials used were 70, 80, and 90 kV. The diameter of the circular field at the cone tip was 7 cm, and the length of the spacer cone was 20 cm. Twelve types of CCD devices with sensitive areas ranging from 307 to 1200 mm 2 were assessed in seven digital intraoral radiographic systems. Results. The number of exposures and effective dose using the CCD devices were inversely proportional to the sensitive area of the CCD. Both the number of exposures and the effective dose were increased when using a CCD with a sensitive area smaller than the intraoral film size. Consequently, a reduction in the patient dose did not occur to the extent expected, based on the relative sensitivity of the CCD to film. Conclusions. In order to fully realize the advantages of a CCD, it will be necessary both to reduce the frequency of examinations and to use a rectangular-shaped beam in CCD-based intraoral radiographic systems.

The Effects of Additional Filtration on Image Quality and Radiation Dose in Cone Beam CT: An In Vivo Preliminary Investigation

“…We assessed noncephalometric landmarks on CBCT images using modified equipment with reduced radiation burden. With the equipment used in our study, the radiation burden of CBCT was roughly equivalent to that of combined conventional DPT and cephalometric radiograph [17][18][19]. This finding suggests that the combined conventional DPT and cephalometric radiograph, which have often been used as part of the initial standard diagnostics [42], could be replaced by CBCT.…”

“…The copper filters F1-F3 used in our investigation led to effective radiation doses of 22.4, 13.8, and 9.4 μ Sv, respectively. Notably, the effective radiation dose for a digital full-size DPT and the cephalometric view is approximately 15 μ Sv [ 17 , 19 ], and the effective radiation dose of an intraoral radiograph is approximately 5 μ Sv [ 18 ].…”

“…During CBCT scans, patients are exposed to radiation doses between 11 and 374 microsievert (μSv) [15,16] that are significantly higher than those in dental panoramic tomography (DPT) or other routinely used imaging modalities in the maxillofacial area (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) [17][18][19]. The applied dose depends on the physical process of radiation production, the irradiated area, and the sensitivity of the radiation-detecting equipment.…”