Estimation of the radiation dose for dental spectral cone-beam CT

2020 ◽  
pp. 20200372
Author(s):  
Kaan Orhan ◽  
Ruben Pauwels ◽  
Yi Chen ◽  
Dandan Song ◽  
Reinhilde Jacobs
Keyword(s):  
Radiation Dose ◽  
Effective Dose ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Dose Area Product ◽  
Ion Chamber ◽  
Effective Doses ◽  
Artefact Reduction ◽  
Area Product ◽  
Dose Measurements

Objectives: The purpose of this study was to estimate the radiation dose for a dental spectral cone-beam CT (SCBCT) unit at different scanning parameters. Methods: Radiation dose measurements were performed for a commercially available dental SCBCT. Scans were obtained at different exposure times and fields of view (FOV), both for non-spectral (25 × 18 cm, 14 × 18 cm, 14 × 12 cm, 9 × 9 cm, 6 × 6 cm) and spectral modes (14 × 18 cm, 14 × 12 cm, 9 × 9 cm, 6 × 6 cm) with the tube voltage alternating between 80 and 110 kV for spectral mode, and fixed at 110 kV for non-spectral mode. An ion chamber was used for air kerma and dose area product (DAP) measurements. The effective dose was estimated based on the mAs using previously published logarithmic curves for CBCT units with a similar X-ray spectrum. Results: The adult effective dose, in non-spectral mode, was 44-269µSv for small FOVs, 131-336µSv for the medium FOV, and 163-476µSv for the large FOV. In spectral mode, the estimated adult effective doses were 96-206µSv for small, 299µSv for medium and 372µSv for large FOV protocols. Pediatric effective doses were estimated to be 75% higher than corresponding adult doses. Conclusion: SCBCT showed comparable doses with other CBCT devices, but DAP values were generally above currently published DRLs. Spectral imaging might allow for artefact reduction at comparable dose levels, which should be assessed in further image quality studies at both a technical and diagnostic level.

scholarly journals Effective doses from panoramic radiography and CBCT (cone beam CT) using dose area product (DAP) in dentistry

2014 ◽  
Vol 43 (5) ◽  
pp. 20130439 ◽  
Author(s):  
H S Shin ◽  
K C Nam ◽  
H Park ◽  
H U Choi ◽  
H Y Kim ◽  
...  
Keyword(s):  
Panoramic Radiography ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Dose Area Product ◽  
Effective Doses ◽  
Area Product

scholarly journals A review of dental cone-beam CT dose conversion coefficients

2020 ◽  
pp. 20200225
Author(s):  
Eugene Mah ◽  
E Russell Ritenour ◽  
Hai Yao
Keyword(s):  
Effective Dose ◽  
Cone Beam Ct ◽  
Field Of View ◽  
Cone Beam ◽  
Tube Voltage ◽  
Conversion Factors ◽  
Dose Area Product ◽  
Ct Dose ◽  
Conversion Coefficients ◽  
Area Product

Objective: The purpose of this study was to review the literature to examine the usage and magnitude of effective dose conversion factors (DCE) for dental cone beam CT (CBCT) scanners. Methods: A PubMed literature search for publications relating to radiation dosimetry in dental radiography was performed. Papers were included if they reported DCE, or reported ICRP 103 effective dose and dose-area product. 71 papers relating to dental CBCT dosimetry were found, of which eight reported effective dose conversion factors or provided enough information to calculate dose conversion factors. Scanner model, effective dose, dose-area product, tube voltage, field of view size and DCE were extracted from the papers for analysis. Results: DCE values ranged from 0.035 to 0.31 µSv/mGy-cm2 with a mean of 0.129 µSv/mGy-cm2 (SD = 0.056). When categorized into small (<100 cm2), medium (100–225 cm2) and large (>225 cm2) fields of view (FOV), linear fits to the effective dose and dose-area product yielded slopes of 0.129, 0.111 and 0.074 µSv/mGy-cm2 for small, medium and large FOVs respectively. Conclusion: The range of reported DCE values and spread with respect to field of view category suggests that DCE values that depend on FOV would provide more accurate effective dose estimates. Tube voltage was found to be a smaller factor in determining DCE. Reasonable values for DCE taking into account FOV size were obtained. There is considerable room for more work to be done to examine the behaviour of DCE with changes to patient age and dental CBCT imaging parameters.

ESTIMATION OF ORGAN DOSES AND EFFECTIVE DOSES BASED ON IN-PHANTOM DOSIMETRY FOR PAEDIATRIC DIAGNOSTIC CARDIAC CATHETERISATION

2019 ◽  
Vol 185 (2) ◽  
pp. 215-221
Author(s):  
Toshio Kawasaki ◽  
Masami Sakakubo ◽  
Kanako Ito ◽  
Ai Kitagawa
Keyword(s):  
Effective Dose ◽  
Cardiac Catheterization ◽  
Organ Doses ◽  
Conversion Factors ◽  
Dose Area Product ◽  
Diagnostic Cardiac Catheterization ◽  
Pediatric Dosimetry ◽  
Effective Doses ◽  
Area Product ◽  
Cardiac Catheterizations

Abstract The present study evaluated the organ doses, effective doses and conversion factors from the dose–area product to effective dose in pediatric diagnostic cardiac catheterization performed by in-phantom dosimetry and Monte Carlo simulation. The organ and effective doses in 5-y-olds during diagnostic cardiac catheterizations were evaluated using radiophotoluminescence glass dosemeters implanted into a pediatric anthropomorphic phantom and PCXMC software. The mean effective dose was 3.8 mSv (range: 1.8–7.5 mSv). The conversion factors from the dose–area product to effective dose were 0.9 and 1.6 mSv (Gy cm2)−1 for posteroanterior and lateral fluoroscopy, respectively, and 0.9 and 1.5 mSv (Gy cm2)−1 for posteroanterior and lateral cineangiography, respectively. Effective doses evaluated using the pediatric dosimetry system agreed with those obtained using PCXMC software within 12%. The dose data and conversion factors evaluated may guide the estimation of exposure doses in children undergoing diagnostic cardiac catheterization.

ESTIMATION OF ORGAN DOSES AND EFFECTIVE DOSES BASED ON IN-PHANTOM DOSIMETRY FOR INFANT DIAGNOSTIC CARDIAC CATHETERISATIONS WITH NOVEL X-RAY IMAGING TECHNOLOGY

2018 ◽  
Vol 183 (4) ◽  
pp. 529-534
Author(s):  
Toshio Kawasaki ◽  
Masami Sakakubo ◽  
Kanako Ito
Keyword(s):  
Effective Dose ◽  
Cardiac Catheterisation ◽  
Organ Doses ◽  
Conversion Factors ◽  
X Ray ◽  
Dose Area Product ◽  
X Ray Imaging ◽  
Effective Doses ◽  
The Mean ◽  
Area Product

Abstract The present study evaluated the organ and effective doses in infant diagnostic cardiac catheterisation performed using a modern x-ray imaging unit by in-phantom dosimetry. In addition, conversion factors from dose–area product (DAP) to effective dose were determined. The organ and effective doses in 1-year old during diagnostic cardiac catheterisations were measured using radiophotoluminescence glass dosemeters implanted into an infant anthropomorphic phantom. The mean effective doses, evaluated according to the International Commission on Radiologic Protection Publication 103, were 4.0 mSv (range: 1.5–8.7 mSv). The conversion factors from DAP to effective dose were 2 and 3.5 mSv (Gy cm2)−1 for posteroanterior and lateral fluoroscopy, respectively, and 1.8 and 3.3 mSv (Gy cm2)−1 for posteroanterior and lateral cineangiography, respectively. The dose data and conversion factors evaluated in the present study may be useful for estimating radiation exposure in infants during diagnostic cardiac catheterisation.

Radiation exposure during TACE procedures using additional cone-beam CT (CBCT) for guidance: safety and precautions

2018 ◽  
Vol 59 (11) ◽  
pp. 1277-1284 ◽  
Author(s):  
M Jonczyk ◽  
F Collettini ◽  
D Geisel ◽  
D Schnapauff ◽  
G Böning ◽  
...  
Keyword(s):  
Radiation Exposure ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Digital Subtraction ◽  
Dose Area Product ◽  
Additional Radiation ◽  
Ethiodized Oil ◽  
The Mean ◽  
Area Product ◽  
Spearman’S Correlation

Background During transarterial chemoembolization (TACE), cone-beam computed tomography (CBCT) can be used for tumor and feeding vessel detection as well as postembolization CT imaging. However, there will be additional radiation exposure from CBCT. Purpose To evaluate the additional dose raised through CBCT-assisted guidance in comparison to TACE procedures guided with pulsed digital subtraction angiography (DSA) alone. Material and Methods In 70 of 140 consecutive patients undergoing TACE for liver cancer, CBCT was used to facilitate the TACE. Cumulative dose area product (DAP), cumulative kerma(air), DAP values of DSA, total and cine specific fluoroscopy times (FT) of 1375 DSA runs, and DAP of 91 CBCTs were recorded and analyzed using Spearman's correlation, Mann–Whitney U-test, and Kruskal–Wallis test. P values < 0.05 were considered significant. Results Additional CBCT increased DAP by 2% ( P = 0.737), kerma(air) by 24.6% ( P = 0.206), and FT by 0.02% ( P = 0.453). Subgroup analysis revealed that postembolization CBCT for detection of ethiodized oil deposits added more DAP to the procedure. Performing CBCT-assisted TACE, DSA until first CBCT contributed about 38% to the total DAP. Guidance CBCT acquisitions conduced to 6% of the procedure's DAP. Additional DSA for guidance after CBCT acquisition required approximately 46% of the mean DAP. The last DSA run for documentation purposes contributed about 10% of the DAP. Conclusion CBCT adds radiation exposure in TACE. However, the capability of CBCT to detect vessels and overlay in real-time during fluoroscopy facilitates TACE with resultant reduction of DAPs up to 46%.

scholarly journals Dose indices in dental cone beam CT and correlation with dose–area product

2013 ◽  
Vol 42 (5) ◽  
pp. 20120362 ◽  
Author(s):  
K Araki ◽  
S Patil ◽  
A Endo ◽  
T Okano
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Dose Area Product ◽  
Area Product

Dose area product in estimation of effective dose of the patients undergoing dental cone beam computed tomography examinations

2018 ◽  
Vol 38 (4) ◽  
pp. 1412-1427 ◽  
Author(s):  
Ivana Kralik ◽  
Dario Faj ◽  
Tomislav Lauc ◽  
Matko Škarica ◽  
Jelena Popić ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Effective Dose ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Dose Area Product ◽  
Area Product

scholarly journals Air kerma area product in cone beam computed tomography

2015 ◽  
Vol 13 (3) ◽  
pp. 309
Author(s):  
Marcus Vinicius Linhares De Oliveira ◽  
Wilson Otto Gomes Batista ◽  
Maria Rosângela Soares ◽  
Paulo Sergio Flores Campos
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
Cone Beam Computed Tomography ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Font Size ◽  
Air Kerma ◽  
Tomography Image ◽  
Reduce Radiation Dose ◽  
Area Product

<p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify;"><strong><em><span style="font-size: 12.0pt; font-family: &quot;Times New Roman&quot;,&quot;serif&quot;; mso-ansi-language: EN-US;" lang="EN-US">Objective:</span></em></strong><em><span style="font-size: 12.0pt; font-family: &quot;Times New Roman&quot;,&quot;serif&quot;; mso-ansi-language: EN-US;" lang="EN-US"> to evaluate the influence of FOV in air kerma-area product (KAP) and the constancy of exposure parameters on cone beam computed tomography equipments. <strong>Methodology</strong>: Two cone beam CT (GENDEX CBX 500 and<br /> &nbsp;i-CAT Classic) were used and seven exposures with the following FOVs were performed: (A) 14cm x 8,5cm, (B) 14cm x 6cm, (C) 8,5cm x 8.5cm e (D) 8,5cm x 6cm, for CBX 500; and (E) 14cm x 6.cm, (F) 14cm x 8cm e (G) 14cm x 13cm, for the i-CAT. The technical exposure factors (kV, mA, mAs and voxel), remained constant. The dosimetric evaluation was performed with air KAP meter manufactured by IBA dosimetry, model kerma X plus TinO, positioned at the output of the X-ray beam. To evaluate the constancy of the exposure parameters a semiconductor <br /> (Radcal, Rapidose) fixed in front of the tomography image receptor was used. <strong>Result:</strong> The KAP values ​​obtained ranged between 360.1 mGy.cm&sup2; and 1031.2 mGy.cm&sup2;. The FOV height had a substantial influence on the radiation dose. Repeatability and accuracy of the tube voltage varied less than 10%. <strong>Conclusion</strong>: The radiation dose is directly related to the height and inversely related with the FOV diameter; even within the recommended limits, the percentage variation of repeatability and accuracy of kV, for the tomography equipments tested, points to the regular equipment calibration, in order to reduce radiation dose to the patient to a minimum.</span></em></p>

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