Niedrigdosis Dental-CT

Rustemeyer, P.; Streubühr, U.; Höhn, H; Rustemeyer, R.; Eich, Hans Theodor; John-Mikolajewski, V.; Müller, R.-D.

doi:10.1055/s-1999-243

Cited by 18 publications

(8 citation statements)

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“…Dose values of this study are in good correlation to data found in other studies [3,6,7,8,9]. Lowering the milliamperage product and increasing pitch may lead to a dose reduction by factor 9 in CT without any loss of diagnostic information [7].…”

Section: Discussionsupporting

confidence: 87%

“…Lowering the milliamperage product and increasing pitch may lead to a dose reduction by factor 9 in CT without any loss of diagnostic information [7]. In another study, a dose reduction of 75 % did not lead to a reduced metric accuracy [10].…”

Section: Discussionmentioning

confidence: 99%

“…In view of these findings we did not perform a detailed image quality analysis. Previous authors pointed out that image noise increases with a reduction in radiation dose [7,8,10]. Analysis of image noise was performed in order to clarify whether the dose reduction in low-dose dental CT produces an image quality different from DVT.…”

Section: Discussionmentioning

confidence: 99%

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Radiation dose in dental radiology

et al. 2002

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The aim of this study was to compare radiation exposure in panoramic radiography (PR), dental CT, and digital volume tomography (DVT). An anthropomorphic Alderson-Rando phantom and two anatomical head phantoms with thermoluminescent dosimeters fixed at appropriate locations were exposed as in a dental examination. In PR and DVT, standard parameters were used while variables in CT included mA, pitch, and rotation time. Image noise was assessed in dental CT and DVT. Radiation doses to the skin and internal organs within the primary beam and resulting from scatter radiation were measured and expressed as maximum doses in mGy. For PR, DVT, and CT, these maximum doses were 0.65, 4.2, and 23 mGy. In dose-reduced CT protocols, radiation doses ranged from 10.9 to 6.1 mGy. Effective doses calculated on this basis showed values below 0.1 mSv for PR, DVT, and dose-reduced CT. Image noise was similar in DVT and low-dose CT. As radiation exposure and image noise of DVT is similar to low-dose CT, this imaging technique cannot be recommended as a general alternative to replace PR in dental radiology.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

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Radiation dose in dental radiology

et al. 2002

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“…The axial plane was the least precise in affording resorption identification, followed by the coronal and the sagittal planes. As demonstrate elsewhere 11 , clinicians must know the best protocol to resort for an accurate diagnosis when requesting CT scans.…”

Section: Discussionmentioning

confidence: 99%

Comparison between two tomographic sections in the diagnosis of external root resorption

et al. 2010

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ObjectivesTo assess the accuracy of coronal and sagittal CT sections to detect cavities simulating root resorption.Material and Methods60 mandibular incisors were embedded in plaster bases, and cavities with 0.6, 1.2 or 1.8 mm in diameter and 0.3, 0.6 or 0.9 mm in depth (small, medium and large cavities) were drilled on the buccal surfaces with high-speed round burs with diameters of 0.6, 1.2 and 1.8 mm to simulate external inflammatory root resorption. Simulations in the cervical, middle and apical thirds of each tooth root were made randomly. The Dental Scan software was used to obtain 1-mm-thick axial images from direct scanning, which were reconstructed in the coronal and sagittal planes using 3D software (Syngo FastView). Each series was loaded into the software. Fourteen images of each tooth were reconstructed in the coronal plane and 14 in the sagittal plane. A total of 1,652 images were obtained for analysis. Series information, tooth number and the plane reconstructed were stored. The images generated were saved on a CD-ROM together with the visualization software (Syngo FastView). Images were analyzed by a previously calibrated blinded, radiologist. Cochran’s Q test was conducted separately for each region analyzed followed by pair-wise comparison by the McNemar test (p=0.05).ResultsNo statistically significant difference (p>0.05) was observed in the diagnosis of simulated resorption between the apical, middle, and coronal thirds. When the axial plane was assessed separately, diagnoses were statistically different (p<0.05) among the three root thirds. The apical third differed significantly (p<0.05) from the cervical and middle thirds. Diagnostic errors were more often observed in the apical third compared to the cervical and middle thirds. Mid-sized cavities revealed no statistically significant differences (p>0.05) between planes, irrespective of the third in which the resorptions were located.ConclusionWhen tomographic sections are requested for the diagnosis of buccal or lingual external root resorption, sagittal sections afford the best image characterization of the resorption process.

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“…Entsprechend dem gegenwärtigen Standard der präoperativen Dokumentation werden bei allen Patienten präoperativ ein OPG, eine Aufnahme nach Clementschitsch sowie bei bilateralen Hypoplasien ein Fernrönt-genseitbild angefertigt [8]. Nur in besonderen Fällen ist eine erweiterte radiologische Diagnostik (CT) indiziert [13,14].…”

Section: Diskussionunclassified