Effective dose span of ten different cone beam CT devices

Rottke, D; Patzelt, Sebastian B. M.; Poxleitner, Philipp; Schulze, Dirk

doi:10.1259/dmfr.20120417

Cited by 65 publications

(56 citation statements)

References 8 publications

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“…The TLD read‐out sequence was performed in a Fimel LTMWin (Fimel, Fontenay‐aux‐Roses, France) device. TLD calibration and read‐out procedures were performed according to a method previously described by Rottke et al, (7) with traceability to secondary standard dosimetry laboratory (SSDL, Freiburg, Germany).…”

Section: Methodsmentioning

confidence: 99%

“…To date, most studies concerning effective dose assessment have used thermoluminescent dosimeters (TLD) in combination with anthropomorphic phantoms 2 , 3 , 4 , 5 , 6 , 7 . The low‐dose limit of TLDs when using single exposure (0.3 mGy) 8 , 9 has been considered adequate in most applications and has, therefore, been used as the reference low‐dose limit in MOSFET uncertainty assessment in this study.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of MOSFET dosimeters for low‐dose measurements in maxillofacial anthropomorphic phantoms

Koivisto

Wolff

Kiljunen

et al. 2015

J Applied Clin Med Phys

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The aims of this study were to characterize reinforced metal‐oxide‐semiconductor field‐effect transistor (MOSFET) dosimeters to assess the measurement uncertainty, single exposure low‐dose limit with acceptable accuracy, and the number of exposures required to attain the corresponding limit of the thermoluminescent dosimeters (TLD). The second aim was to characterize MOSFET dosimeter sensitivities for two dental photon energy ranges, dose dependency, dose rate dependency, and accumulated dose dependency. A further aim was to compare the performance of MOSFETs with those of TLDs in an anthropomorphic phantom head using a dentomaxillofacial CBCT device. The uncertainty was assessed by exposing 20 MOSFETs and a Barracuda MPD reference dosimeter. The MOSFET dosimeter sensitivities were evaluated for two photon energy ranges (50–90 kVp) using a constant dose and polymethylmethacrylate backscatter material. MOSFET and TLD comparative point‐dose measurements were performed on an anthropomorphic phantom that was exposed with a clinical CBCT protocol. The MOSFET single exposure low dose limit (25% uncertainty, normalk=2) was 1.69 mGy. An averaging of eight MOSFET exposures was required to attain the corresponding TLD (0.3 mGy) low‐dose limit. The sensitivity was 3.09±0.13 mV/mGy independently of the photon energy used. The MOSFET dosimeters did not present dose or dose rate sensitivity but, however, presented a 1% decrease of sensitivity per 1000 mV for accumulated threshold voltages between 8300 mV and 17500 mV. The point doses in an anthropomorphic phantom ranged for MOSFETs between 0.24 mGy and 2.29 mGy and for TLDs between 0.25 and 2.09 mGy, respectively. The mean difference was −8%. The MOSFET dosimeters presented statistically insignificant energy dependency. By averaging multiple exposures, the MOSFET dosimeters can achieve a TLD‐comparable low‐dose limit and constitute a feasible method for diagnostic dosimetry using anthropomorphic phantoms. However, for single in vivo measurements (<1.7 mGy) the sensitivity is too low.PACS number: 87.50.wj

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of MOSFET dosimeters for low‐dose measurements in maxillofacial anthropomorphic phantoms

Koivisto

Wolff

Kiljunen

et al. 2015

J Applied Clin Med Phys

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“…Bei Untersuchungen von Panoramaaufnahmen und dentalen Cone-beam-CT-Bildern zeigten sich keine signifikanten Dosiseinsparungen durch das Tragen einer Patientenschürze [32][33][34].…”

Section: Röntgenaufnahmen In Der Zahnmedizinunclassified

Praktischer Strahlenschutz am Patienten in der radiologischen Diagnostik

Fiebich

2017

Radiologe

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[6,12,39]. Die durch Röhrenstrommodulati-on und Sektorscan mögliche Dosiseinsparung liegt bei ca. 10 %, die mittlere Dosis der Mamma kann von ca. 10,6 auf 6,1 mGy (40 %) beim Sektorscan bzw. 9,6 mGy (10 %) bei Röhrenstrommodu-lation in z-Richtung gesenkt werden.Durch die Verwendung eines Schilddrüsenschutzes kann eine Reduktion der Organdosis von 8,37 auf 5,78 mGy um 31 %, bzw. durch Verwendung eines Augenlinsenschutzes die entsprechende Organdosis von 0,32 auf 0,22 mGy um ebenfalls 31 % erzielt werden [2]. Ein Schutz der Schilddrüse ist bei allen pädiatrischen Altersgruppen wegen der Körperpropor-tionen, insbesondere wegen des sehr kurzen Halses, nicht praktikabel.Die Verwendung einer Bleiabdeckung um das Abdomen reduziert eine geringe

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“…20 The number of CBCT units 21 will likely soon surpass the number of standard CT systems in the United States, estimated to be 10 335 in 2007. 22 Although the reported range of effective doses for examinations conducted on CBCT units (20 mSv to approximately 500 mSv) [23][24][25] is lower than that of examinations performed using standard CT systems by a factor of 4 to 100, there should still be concern in dentistry, because some CBCT unit doses to specific organs are high and CBCT examinations are being proposed, by some, as substitutes for conventional imaging.…”

Section: Introductionmentioning

confidence: 99%