Absorbed and effective doses from cone beam volumetric imaging for implant planning

Okano, T; Harata, Yasuo; Sugihara, Yoshie; Sakaino, Rie; Tsuchida, Ryoko; Iwai, Kazuo; Seki, Keisuke; Araki, Kazuo

doi:10.1259/dmfr/14769929

Cited by 130 publications

(92 citation statements)

References 27 publications

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“…Consequently, the doses measured at those points should be much less than the upper estimates of the foetal dose in the present study, as measured at the liver level. In the study by Okano et al, 21 the uterine doses in CBCT were lower than the CBCT doses in the present study, and closer to the doses in intraoral, panoramic and cephalometric examinations.…”

Section: Discussionsupporting

confidence: 73%

“…This may be due to high uncertainties in Ludlow's 17 effective dose calculations from low doses, since many organs receive doses close to zero. The maximum breast doses in CBCT measured by Okano et al 21,22 were about half the maximum breast doses in CBCT of the present study, excluding the implant mode in CBCT, for which the dose was double. An exception in the otherwise uniform exposure parameters was in the study by Okano et al; 21 the tube voltage in implant mode was 120 kV instead of the more typical dental values of 65-90 kV common in the other studies ( Table 1).…”

Section: Discussioncontrasting

confidence: 43%

“…The studies by Buch et al 19 and Okano et al 21,22 include dose measurement in the normal uterus at one to three measurement points. Consequently, the doses measured at those points should be much less than the upper estimates of the foetal dose in the present study, as measured at the liver level.…”

Section: Discussionmentioning

confidence: 99%

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Radiation exposure to foetus and breasts from dental X-ray examinations: effect of lead shields

Kelaranta

Ekholm

Toroi

et al. 2016

Dentomaxillofacial Radiology

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Objectives: Dental radiography may involve situations where the patient is known to be pregnant or the pregnancy is noticed after the X-ray procedure. In such cases, the radiation dose to the foetus, though low, needs to be estimated. Uniform and widely used guidance on dental X-ray procedures during pregnancy are presently lacking, the usefulness of lead shields is unclear and practices vary. Methods: Upper estimates of radiation doses to the foetus and breasts of the pregnant patient were estimated with an anthropomorphic female phantom in intraoral, panoramic, cephalometric and CBCT dental modalities with and without lead shields. Results: The upper estimates of foetal doses varied from 0.009 to 6.9 mGy, and doses at the breast level varied from 0.602 to 75.4 mGy. With lead shields, the foetal doses varied from 0.005 to 2.1 mGy, and breast doses varied from 0.002 to 10.4 mGy. Conclusions: The foetal dose levels without lead shielding were ,1% of the annual dose limit of 1 mSv for a member of the public. Albeit the relative shielding effect, the exposure-induced increase in the risk of breast cancer death for the pregnant patient (based on the breast dose only) and the exposure-induced increase in the risk of childhood cancer death for the unborn child are minimal, and therefore, need for foetal and breast lead shielding was considered irrelevant. Most important is that pregnancy is never a reason to avoid or to postpone a clinically justified dental radiographic examination.

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Section: Discussionsupporting

confidence: 73%

Section: Discussioncontrasting

confidence: 43%

See 1 more Smart Citation

Radiation exposure to foetus and breasts from dental X-ray examinations: effect of lead shields

Kelaranta

Ekholm

Toroi

et al. 2016

Dentomaxillofacial Radiology

View full text Add to dashboard Cite

show abstract

“…Moreover, the level of radiation exposure to the head and neck region is less than one -seventh of that from a conventional CT scan 9) . Compared to MDCT, CBCT has better spatial resolution, but limited contrast resolution.…”

Section: -7)mentioning

confidence: 99%

Assessment of non-invasive chronic fungal rhinosinusitis by cone beam CT: comparison with multidetector CT findings

Yamauchi

Tani

Yokoyama

2017

FJMS

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Objective : To investigate the accuracy of cone beam CT (CBCT) to diagnose non -invasive chronic fungal rhinosinusitis. Methods : Preoperative CT evaluation of non -invasive chronic fungal rhinosinusitis was performed by CBCT (3D Accuitomo 170 ® ) and traditional multidetector CT (MDCT) (Aquilion 32 ® ) in 13 and 38 patients with non -invasive chronic fungal maxillary sinusitis, respectively, in different facilities. Detection of intrasinus calcification was compared between these two groups. Results : Detection of intrasinus calcification in patients with non -invasive chronic fungal maxillary sinusitis was higher in the MDCT group (84.2%) than the CBCT group (46.2%). Conclusion : CBCT is inferior to MDCT in detection of intrasinus calcification in patients with noninvasive chronic fungal maxillary sinusitis. CBCT is frequently used in the screening of the paranasal lesion, but it is not enough to evaluate non -invasive chronic fungal maxillary sinusitis alone. Study design : Retrospective study.

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“…Cross-sectional information can be acquired with conventional medical computed tomography (CT) [4] . Despite the usefulness of medical CT in implant imaging [7][8][9] , the high cost, limited availability, and relatively high radiation exposure make its routine use impractical [5][6][7][8][9] . Cone Beam Computed Tomography (CBCT) is a relatively newer 3D imaging modality specifically designed for oral and maxillofacial regions [9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Comparison of two cone beam computed tomography multiplanar reconstruction orientation protocols

Kumar¹,

Ang²,

Williams³

et al. 2013

JBGC

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Objective: The utilization of cone beam computed tomographic imaging for oral implants has increased enormously for precise determination of anatomic dimensions. However, the impact of reorientation of data that influences the constructed panoramic view and thus the measurements on generated cross sectional views has not been explored. This study is undertaken to explore if differences exist in the implant height and width measurement when the whole data is reoriented from the standard manufacturer's setting to an aligned protocol (perpendicular to the implant (XYZ) settings). Material and Methods:Two different orientation protocols were set up, standard and aligned or perpendicular setting (XYZ), and implant height and width measurements derived from these were compared to the original known measurements. Results:The range of differences between actual dimensions and measurements obtained using each orientation method using McNemar's Change test in the four accuracy categories (exact, +0.20, +0.25, and +0.50) showed the aligned orientation produced larger proportion of width measurements between +0.25 and +0.50 compared to standard for width measures; however, these differences were not statistically significant. Implant length measurements varied widely and this variability was irrespective of orientation method. Conclusions:The aligned/perpendicular (XYZ) protocol produces implant width measurements more accurate than length when compared to the standard protocol.

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Absorbed and effective doses from cone beam volumetric imaging for implant planning

Cited by 130 publications

References 27 publications

Radiation exposure to foetus and breasts from dental X-ray examinations: effect of lead shields

Radiation exposure to foetus and breasts from dental X-ray examinations: effect of lead shields

Assessment of non-invasive chronic fungal rhinosinusitis by cone beam CT: comparison with multidetector CT findings

Comparison of two cone beam computed tomography multiplanar reconstruction orientation protocols

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