Small field of view cone beam CT temporomandibular joint imaging dosimetry

Lukat, T D; Wong, Jiemin; Lam, Ernest W.N.

doi:10.1259/dmfr.20130082

Cited by 28 publications

(19 citation statements)

References 17 publications

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“…Studies that fail to adjust for attenuation differences of the bone and soft tissues may underestimate bone doses by a factor of 2-43. 30,42 Examining the ratio of the bone to bone marrow doses using the means in Table 11 suggests a range of 3.1-4.13 average underestimation of the bone dose if dosemeter values are not corrected for bone attenuation efficiency. This will lead to a 2-5% underestimation of effective dose depending on the size of the FOV.…”

Section: Fov Sizementioning

confidence: 99%

Effective dose of dental CBCT—a meta analysis of published data and additional data for nine CBCT units

Ludlow¹,

Timothy²,

Walker

et al. 2015

Dentomaxillofacial Radiology

392

286

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Section: Fov Sizementioning

confidence: 99%

Effective dose of dental CBCT—a meta analysis of published data and additional data for nine CBCT units

Ludlow¹,

Timothy²,

Walker

et al. 2015

Dentomaxillofacial Radiology

392

286

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“…Similarly, Luckat et al (15) performed dosimetry of CBCT exams for TMJ region and reported a significant reduction of effective dose when two small FOVs were used in comparison with a large FOV. However, different CBCT devices were used for this purpose: Kodak 9000 for image acquisitions with small FOV and Hitachi CB MercuRay for a single field acquisition including both TMJs.…”

Section: Discussionmentioning

confidence: 99%

“…One factor contributing to this is that most of dosimetry CBCT studies evaluated the dose in exams obtained with large or medium FOVs (4,(10)(11)(12)(13)(14)(15). In such cases, the large FOV is centered on the maxillo-mandibular region.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is unclear whether the use of a smaller FOV reduces radiation dose to patient, since two exposures would be necessary to scan both TMJs. A direct comparison of doses delivered by different FOV sizes for assessment of bilateral structures has not been performed yet, since previous studies compared doses delivered for TMJ exams produced by different devices (15,16). That drawback was secondary to the use of equipment without large FOV settings; since the devices operated with different energy factors, therefore it is not precise to attribute any dose variation to FOV size alone.…”

Section: Introductionmentioning

confidence: 99%

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Dosimetry in CBCT with Different Protocols: Emphasis on Small FOVs Including Exams for TMJ

Nascimento

Andrade

Frazão³

et al. 2017

Braz. Dent. J.

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This study aimed to estimate the absorbed dose in cone beam computed tomography (CBCT) exams according to different exposure parameters and size and position of the field of view (FOV). In addition was compared the absorbed dose of two smaller FOV scans with that of a larger FOV scan for evaluation of temporomandibular joint (TMJ), as it is a bilateral structure. CBCT scans were obtained on OP300 Maxio unit varying scanning mode (standard, high and endo) as well as size (5x5, 6x8 and 8x15 cm) and positioning of FOV. With a small FOV, different areas were scanned (maxilla or mandible, anterior or posterior and TMJ). Absorbed doses were determined using thermoluminescent dosimeters on the skin surface of sensitive organs of an anthropomorphic phantom. Endo mode showed the highest dose, followed by the high and standard modes in all FOV positions. With small FOV, doses were higher in the posterior region, especially in the mandible. Dose reduction occurred when small FOVs were used, but it was not proportional to FOV size reduction. For TMJ, the dose in a single acquisition with large FOV was greater than two acquisitions with small FOV, but lower than two acquisitions with medium FOV (6x8 cm). In conclusion, scanning mode, size and FOV position have great influence on the absorbed dose. Small FOV decreases the dose, but there is no linear relation between FOV size and dose. For bilateral exams of TMJ, double acquisition with small FOVs produces decrease in absorbed dose relative to a large FOV.

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“…Librizzi et al 13 reported the effective dose from bilateral TMJ examination using a different CBCT device, CB MercuRay (Hitachi Medical, Twinsburgh, OH), resulting in 550 m Sv for either one 9-inch FOV or two 6-inch FOVs. Lukat et al 14 reported an effective dose of 220 mSv from a CB MercuRay using a 9-inch FOV, and 20 mSv from a Kodak 9000 3D (Carestream, Rochester, NY) CBCT using two 5.0 3 3.7 cm FOVs. The difference between the effective doses determined for CBCT and MSCT in the present study, 92 and 124 mSv, respectively, were minor compared with the very large range of effective doses from CBCT examinations of the TMJ in the literature, 20-550 mSv.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the effective dose of cone beam CT and multislice CT for temporomandibular joint examinations at optimized exposure levels

Kadesjö¹,

Benchimol²,

Falahat³

et al. 2015

Dentomaxillofacial Radiology

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Objectives: To compare the effective dose to patients from temporomandibular joint examinations using a dental CBCT device and a multislice CT (MSCT) device, both before and after dose optimization. Methods: A Promax ® 3D (Planmeca, Helsinki, Finland) dental CBCT and a LightSpeed VCT ® (GE Healthcare, Little Chalfont, UK) multislice CT were used. Organ doses and effective doses were estimated from thermoluminescent dosemeters at 61 positions inside an anthropomorphic phantom at the exposure settings in clinical use. Optimized exposure protocols were obtained through an optimization study using a dry skull phantom, where four observers rated image quality taken at different exposure levels. The optimal exposure level was obtained when all included criteria were rated as acceptable or better by all observers. Results: The effective dose from a bilateral examination was 184 mSv for Promax 3D and 113 mSv for LightSpeed VCT before optimization. Post optimization, the bilateral effective dose was 92 mSv for Promax 3D and 124 mSv for LightSpeed VCT. Conclusions: At optimized exposure levels, the effective dose from CBCT was comparable to MSCT.

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Small field of view cone beam CT temporomandibular joint imaging dosimetry

Cited by 28 publications

References 17 publications

Effective dose of dental CBCT—a meta analysis of published data and additional data for nine CBCT units

Effective dose of dental CBCT—a meta analysis of published data and additional data for nine CBCT units

Dosimetry in CBCT with Different Protocols: Emphasis on Small FOVs Including Exams for TMJ

Evaluation of the effective dose of cone beam CT and multislice CT for temporomandibular joint examinations at optimized exposure levels

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