Dosimetry of Three Cone Beam Computerized Tomography  Scanners at Different Fields of View in Terms of Various Head and Neck Organs

Nikneshan, Sima; Aghamiri, Mahmoud Reza; Moudi, Ehsan; Bahemmat, Nika; Hadian, Hoora

doi:10.5812/iranjradiol.34220

Cited by 6 publications

(5 citation statements)

References 31 publications

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“…Several parameters can be varied during image acquisition according to the diagnostic task but still no protocols have been established for specific diagnostic tasks in dentistry [18] . In our study we proved that changing the voxel size will not affect the accuracy of the nerve tracing tool, and so using larger voxel size will not affect the clinical outcome and decrease the patient absorbed dose according to Nikneshan et al [36] .…”

Section: Discussionsupporting

confidence: 58%

Effect of Voxel Size On The Accuracy of Nerve Tracing Module of Cone Beam Computed Tomography Images

Ashmawy

Abou-Khalaf

Mostafa

2017

Egyptian Dental Journal

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Introduction: Cone beam computed tomography (CBCT) has been used for preoperative treatment planning for dental implants, one of the major advantages is its accurate linear measurements. But when it comes to automatic detection of voxel intensity values as in automatic nerve detection, little evidence in the literature was found. Thus; in order to examine the accuracy of this automatic process, this study was performed in vitro. Methods: A dry edentulous mandible was imaged using i-CAT next generation (Imaging sciences international, Hatfield, PA, USA) using gutta percha markers at certain areas of interest, the reconstructed panoramic image was evaluated and nerve tracing was done for both sides, then linear measurements was performed from the edge of the inferior alveolar nerve canal (IANC) to the inferior border of mandible, buccal, lingual and crest of the ridge. These measurements were compared to actual physical measurements performed by using a digital caliber after sectioning of the mandible at the gutta percha sites. Results: Intra-observer agreement was good to very good regarding all measurements for both observers, while inter observer agreement was weak to very good regarding all measurements for both observers. There was no statistically significant difference between the CBCT scans (0.2 mm, 0.3 mm, and 0.4 mm voxel size) regarding all measurements except one measurement at the 0.4 mm voxel size CBCT scan showed a statistically significant high mean error. Conclusion: The choice of FOV and voxel size should be made by clinicians based on the clinical task at hand, keeping in mind that their choices not only affect the diagnostic quality of images but also the amount of radiation exposure that their patients receive.

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Section: Discussionsupporting

confidence: 58%

Effect of Voxel Size On The Accuracy of Nerve Tracing Module of Cone Beam Computed Tomography Images

Ashmawy

Abou-Khalaf

Mostafa

2017

Egyptian Dental Journal

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“…The findings indicated that dental CBCT delivers lower doses for orthognathic patients, whereas CBCT and MDCT give equivalent doses for temporal bone operations. In 4, Sima Nikneshan et al [52] estimated average tissue absorbed dose and effective dose using TLD chips in a radiation analog dosimetry phantom in Comparative dosimetry of dental CBCT systems for important organs. The average absorbed dosage in both FOVs varied from 0.31 mGy to 81.42 mGy.…”

Section: Resultsmentioning

confidence: 99%

Review: Dosimetry in Dental Radiology

Al-Salihi¹,

Al-Saedi²,

Abdullah³

et al. 2021

KUJSS

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The aim of this study was to determine, by a systematic review, the radiation doses of different dental x-ray devices, their particular effects, and the cumulative results of various studies done with various dosimeters. Google scholar was searched from 2014 to 2021 using the following keywords: radiation dose, dosimeters in dentistry, types of dosimeters, Cone beam computed tomography (CBCT) radiation. The references of selected papers were also analyzed. Articles were chosen that fit the criterion for utilizing dosimeters in dentistry applications. This review was separated into four sections: (1) biological impacts of radiation, (2) dosimeter characteristics, (3) dosimeter kinds, and (4) the findings of numerous investigations employing various dosimeters. According to a recent assessment of dosimetry based on different investigations conducted with dosimeters, the effective dosage supplied has decreased since the introduction of radiography techniques. As a result, radiological method selection is critical in dental dosage administration.

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“…These findings highlight the optimal efficacy of indirect dosimetry by use of a software program as an alternative for other dosimetry method. Nikneshan et al (11) , performed dosimetry for three CBCT devices with small and large FOVs using TLD and RANDO phantom. The organ absorbed dose and whole-body effective dose in smaller FOVs were higher, probably due to automatic increase in image resolution by changing the size of FOV from large to small (11) .…”

Section: Discussionmentioning

confidence: 99%

New method to organ dose assessment in cone-beam computed tomography using ImPACT software

2021

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Background: This study sought to assess the organ absorbed dose using ImPACT software and evaluate the effect of small and large fields of view (FOVs) for three cone-beam computed tomography (CBCT) devices on the organ absorbed dose. Materials and Methods: The weighted computed tomography dose index (CTDIw) is measured using a pencil ionization chamber which was incorporated in a polymethyl methacrylate (PMMA) phantom for three CBCT devices with small and large FOVs. The calculated CTDIw was entered into the ImPACT software. Then the organ absorbed dose of the thyroid gland, salivary glands, oral mucosa, skin, brain, and red bone marrow and the whole-body effective dose were calculated by the software. Results: Irrespective of the type of CBCT device, the organ absorbed dose was obtained higher value in use of a larger FOV (P<0.01). The mean organ absorbed dose in use of large and small FOVs was 0.13 and 0.08 for New Tom GiANO, 0.49 and 0.13 for Vista Vox S and 0.69 and 0.38 for XMIND Trium, respectively. Salivary glands had the highest organ absorbed dose among all of the organs within the field. Larger FOVs yielded higher whole-body effective and organ absorbed doses compared with smaller FOVs. Conclusion:The results showed that using the ImPACT software to estimate the organ absorbed dose can serve as a suitable alternative to other costly and time-consuming methods available for this dose assessment in CBCT.

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Dosimetry of Three Cone Beam Computerized Tomography Scanners at Different Fields of View in Terms of Various Head and Neck Organs

Cited by 6 publications

References 31 publications

Effect of Voxel Size On The Accuracy of Nerve Tracing Module of Cone Beam Computed Tomography Images

Effect of Voxel Size On The Accuracy of Nerve Tracing Module of Cone Beam Computed Tomography Images

Review: Dosimetry in Dental Radiology

New method to organ dose assessment in cone-beam computed tomography using ImPACT software

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