Vergleichende Untersuchung zur Möglichkeit der Dosisreduzierung von Fernröntgenseitenaufnahmen

Ruppenthal, T; Fricke, B.; Sergl, H. G.; Doll, Gerhard Michael

doi:10.1007/bf02165144

Cited by 3 publications

(14 citation statements)

References 21 publications

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“…The use of cephalostats provided a clear-cut increase in the reproducibility of the radiographs [3]. The insertion of wedge-shaped aluminium filters into the radiation beam in the region of the anterior facial soft tissues or the use of special dispersion foils [16] permitted better visualization of the facial soft tissues. Besides efforts to improve the quality of the images, the focus was increasingly on reducing the radiation exposure, so that a broad range of technical innovations aimed at reducing the exposure was introduced into the clinical routine.…”

Section: Discussionmentioning

confidence: 99%

“…With the increasing systematic use of lateral cephalograms, attention is being directed more and more to questions of radiation protection. As most orthodontic patients are children or adolescents, even greater consideration has to be given to keeping radiation exposure to a minimum [16]. Current doses for lateral cephalograms are 0.05 to 1.1 mSv, to which exposure to natural radiation sources amounting to about 2 mSv per year has to be added [13].…”

Section: Introductionmentioning

confidence: 99%

“…Besides optimizing recording procedures, applying more sensitive film and augmentation foils, better filters and better concentration of X-rays, efforts were also made to reduce the radiation load by using digital imaging techniques [16,19]. An alternative technique for surveying the skull without radiation exposure is available with the Digigraph ® (Dolphin Imaging Systems Inc., Woodland Hills, California, USA), which allows cephalometric analyses to be performed by measuring the sonic signals emitted by microphones in a defined position.…”

Section: Introductionmentioning

confidence: 99%

“…oder die Verwendung besonderer Verlaufsfolien[16] gelang eine bessere Darstellung der Gesichtsweichteile. Neben den Bemühungen um eine bessere Qualität der Aufnahmen stand zunehmend auch die Reduktion der Strahlenbelastung für die Patienten im Zentrum des Interesses.…”

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Reliability and Validity of the Digigraph® 100 in Orthodontic Diagnosis

et al. 2001

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Cephalometric analyses of lateral cephalograms allow important statements to be made on diagnosis and treatment planning. Such radiographs should, however, be taken with a considerable reduction in radiation exposure. With the Digigraph 100 (Dolphin Imaging Systems Inc., USA) a cephalometric technique based on distance measurements of emitted sonic signals is now available. This study was aimed at determining the degree to which this procedure can cope with the requirements of reliability and validity in the field of orthodontics. For this purpose 50 volunteers were examined by conventional cephalometry with manual tracing of lateral cephalograms as well as by sonic cephalometry, with Jarabak analysis in both cases. In addition an option was available for reading lateral cephalograms into the Digigraph by means of a radiograph evaluation program. The 31 evaluated parameters were subjected to modified statistical analysis. Good reliability was recorded in the range between 0.96 and 0.99 for eleven sonic cephalometric measurements, whereas 26 values were between 0.69 and 0.95. The validity was significantly lower in comparison to radiocephalometry. In particular, measurements related to landmarks which were difficult to access or could be only indirectly determined, such as the sella point, the articulare point or the apices of the incisors, proved to be weak points of sonic cephalometry. The device is thus indicated rather in the field of communication with the patient or for intermediate examination without radiation exposure. Cephalometry without radiation exposure would represent decisive progress in orthodontic diagnostics. However, some developmental work on the processing software or even the development of a specific sonic cephalometry which deliberately dispenses with parameters that are difficult to record with this procedure is still needed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reliability and Validity of the Digigraph® 100 in Orthodontic Diagnosis

et al. 2001

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“…Previous studies have shown the adequate diagnostic value of digital cephalograms [7,[15][16][17]. Half of the patients were randomly assigned to conventional X-ray technique (film-screen system) and the other half to digital luminescence radiography.…”

Section: Methodsmentioning

confidence: 99%

Prospective study on the reproducibility of cephalometric landmarks on conventional and digital lateral headfilms

Hagemann

Vollmer

Niegel

et al. 2000

J Orofac Orthop/Fortschr Kieferorthop

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The introduction of digital X-ray techniques offered a variety of new possibilities for digital image enhancement and exposure reduction. In order to compare the reproducibility of cephalometric landmarks on conventional and digital lateral headfilms 100 digital and 100 conventional lateral headfilms of patients attending our clinic were randomly selected. The digital cephalograms were obtained using storage phosphor plates in standard X-ray cassettes. All X-rays had been taken at 77 kV. For the digital images the mAs settings for conventional images minus 4 mAs were used. Two orthodontists traced each X-ray twice (21 reference points) at an interval of at least 1 week. The tracings were superimposed and the distances between the tracings of identical reference points were registered. The average reproducibility of cephalometric landmarks was significantly higher on the digitally obtained images, despite a reduction of radiation exposure of 23.7% in the digital images.

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A study of dose reduction using digital luminescence radiography for lateral skull radiography

Seifert¹,

Kubale²,

Hagen³

et al. 1996

The British Journal of Radiology

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For lateral skull radiography the minimum required radiation patient exposure to ensure adequate image quality was determined for digital luminescence radiography (DLR) in comparison with a screen-film system (speed class 200). Radiographs were produced with a grid technique on conventional X-ray equipment. A real prepared female head including a true fracture above the pars petrosa ossis temporalis was imaged. The tube current-time product (mAs), and thus the surface entrance dose, was varied systematically. Surface entrance dose was measured with TLD-100 rods. Image quality was judged by experienced radiologists according to the criteria: visual resolution, mean optical density, contrast and perceptibility of specific bone structures. Surface entrance dose was reduced from 0.46 to 0.20 mGy by application of DLR instead of speed class 200 screen-film system without loss of diagnostic information in clinical routine. This corresponds to a dose reduction potential of 57% showing a good agreement with the dose reduction potential of 52% obtained in a previous study using the Alderson head phantom.

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Vergleichende Untersuchung zur Möglichkeit der Dosisreduzierung von Fernröntgenseitenaufnahmen

Cited by 3 publications

References 21 publications

Reliability and Validity of the Digigraph® 100 in Orthodontic Diagnosis

Reliability and Validity of the Digigraph® 100 in Orthodontic Diagnosis

Prospective study on the reproducibility of cephalometric landmarks on conventional and digital lateral headfilms

A study of dose reduction using digital luminescence radiography for lateral skull radiography

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