Reduktion der Strahlendosis mittels Speicherfolienradiographie am Handphantom

Heyne, Jens-Peter; Merbold, Hannes; Sehner, J.; Neumann, Ronald D.; Adler, Ronald S.; Freesmeyer, Martin; Kaiser, Walter

doi:10.1055/s-2000-336

Cited by 6 publications

(4 citation statements)

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“…As far as characterization of wrist fractures is concerned, Heyne et al report a possible dose reduction of approximately 39% without a loss in diagnostic accuracy [6], and we can confirm their results with a similar dose reduction of 37% (i.e. from 37.5 µGy for the speed class 100 to 23.4 µGy for the speed class 200 for the posteroanterior wrist radiograph) in our series.…”

Section: Discussionsupporting

confidence: 88%

“…Sufficient contrast resolution and a favourable signalto-noise ratio (SNR) depend on the detective quantum efficiency (DQE) of the imaging system [10], but in contrast to the maximum spatial resolution, SNR may change dramatically according to the applied exposure dose. In phantom-based studies the question has been addressed as to how low-dose acquisition and thus increased image noise may affect diagnostic accuracy in fracture detection, and possible dose reductions have been reported [6]. In a study by Seifert et al [11] storage phosphor and screen-film radiographs of a head phantom were compared.…”

Section: Discussionmentioning

confidence: 99%

“…While these studies rely on the evaluation of radiographs acquired at the same dose level, the potential for dose reduction in computed radiography is hardly addressed [5,6]. Due to the high dynamic range of storage phosphors, an overall dose reduction may be possible, but there are only very few reports about image quality and diagnostic accuracy at lower dose levels.…”

Section: Introductionmentioning

confidence: 99%

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Storage phosphor radiography of wrist fractures: a subjective comparison of image quality at varying exposure levels

Peer

Lanser²,

Giacomuzzi

et al. 2002

Eur Radiol

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Image quality of storage phosphor radiographs acquired at different exposure levels was compared to define the minimal radiation dose needed to achieve images which allow for reliable detection of wrist fractures. In a study on 33 fractured anatomical wrist specimens image quality of storage phosphor radiographs was assessed on a diagnostic PACS workstation by three observers. Images were acquired at exposure levels corresponding to a speed classes 100, 200, 400 and 800. Cortical bone surface, trabecular bone, soft tissues and fracture delineation were judged on a subjective basis. Image quality was rated according to a standard protocol and statistical evaluation was performed based on an analysis of variance (ANOVA). Images at a dose reduction of 37% were rated sufficient quality without loss in diagnostic accuracy. Sufficient trabecular and cortical bone presentation was still achieved at a dose reduction of 62%. The latter images, however, were considered unacceptable for fracture detection. To achieve high-quality storage phosphor radiographs, which allow for a reliable evaluation of wrist fractures, a minimum exposure dose equivalent to a speed class of 200 is needed. For general-purpose skeletal radiography, however, a dose reduction of up to 62% can be achieved. A choice of exposure settings according to the clinical situation (ALARA principle) is recommended to achieve possible dose reductions.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Storage phosphor radiography of wrist fractures: a subjective comparison of image quality at varying exposure levels

Peer

Lanser²,

Giacomuzzi

et al. 2002

Eur Radiol

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“…Mit steigender Körnigkeit wird es immer schwieriger, vor allem kontrastarme kleine Strukturen abzugrenzen (24). Durch die benutzergesteuerte Bildnachverarbeitung kann dieser Einfluss teilweise kompensiert werden (8,9). In den eigenen Untersuchungen war auch unter den Bedingungen des klinischen Einsatzes für zwei gebräuchliche Auf-nahmedosen kein Einfluss des Signal-Rausch-Verhältnisses auf die Güte der Darstellung nachweisbar.…”

Section: Abb 3 (Fortsetzung)unclassified

Digitale Radiographie: Ist die Qualität der Röntgenaufnahmen am Monitor besser als am Leuchtkasten?

Werrmann¹,

Ludewig²,

Richter³

et al. 2009

Tierarztl Prax Ausg K

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Zusammenfassung Gegenstand und Ziel: Es erfolgte ein Vergleich zwischen digitalen, am Monitor ausgewerteten Röntgenaufnahmen und solchen, die als Laser-ausdruck am Röntgenfilmbetrachter analysiert werden, hinsichtlich Qualität der Abbildung anatomischer Strukturen. Weiterhin wurde geprüft, ob die Belichtung das Ergebnis beeinflusst. Material und Methode: In einer prospektiven Untersuchung wurden seitliche Thoraxaufnahmen von 57 gesunden Katzen mit einem Speicherfoliensystem erzeugt. Die Bildqualität des Monitorbildes wurde mit der des Filmausdrucks am Röntgenfilmbetrachter verglichen. Vier in der Beurteilung digitaler Röntgenaufnahmen erfahrene Tierärzte hatten die Aufgabe, fünf definierte Bildmerkmale anhand einer fünfstufigen Konfidenzskala zu bewerten. Ergebnisse: Es ließ sich eine Überlegenheit der Bildschirmbefundung gegenüber der Auswertung am Leuchtkasten nachweisen. Die Aufnahmedosis beeinflusste das Ergebnis nicht. Schlussfolgerung und klinische Relevanz: Die Auswertung am Monitor eröffnet die Möglichkeit, die aufgezeichnete Bildinformation umfassender für die Diagnosestellung zu nutzen. Der Bildschirmarbeitsplatz muss bestimmte Mindestanforderungen erfüllen, insbesondere hinsichtlich der Leistungsfähigkeit des Monitors.

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A paediatric X‐ray exposure chart

Knight

2014

J of Medical Radiation Sci

101

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The aim of this review was to develop a radiographic optimisation strategy to make use of digital radiography (DR) and needle phosphor computerised radiography (CR) detectors, in order to lower radiation dose and improve image quality for paediatrics. This review was based on evidence-based practice, of which a component was a review of the relevant literature. The resulting exposure chart was developed with two distinct groups of exposure optimisation strategies – body exposures (for head, trunk, humerus, femur) and distal extremity exposures (elbow to finger, knee to toe). Exposure variables manipulated included kilovoltage peak (kVp), target detector exposure and milli-ampere-seconds (mAs), automatic exposure control (AEC), additional beam filtration, and use of antiscatter grid. Mean dose area product (DAP) reductions of up to 83% for anterior–posterior (AP)/posterior–anterior (PA) abdomen projections were recorded postoptimisation due to manipulation of multiple-exposure variables. For body exposures, the target EI and detector exposure, and thus the required mAs were typically 20% less postoptimisation. Image quality for some distal extremity exposures was improved by lowering kVp and increasing mAs around constant entrance skin dose. It is recommended that purchasing digital X-ray equipment with high detective quantum efficiency detectors, and then optimising the exposure chart for use with these detectors is of high importance for sites performing paediatric imaging. Multiple-exposure variables may need to be manipulated to achieve optimal outcomes.

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Reduktion der Strahlendosis mittels Speicherfolienradiographie am Handphantom

Cited by 6 publications

References 0 publications

Storage phosphor radiography of wrist fractures: a subjective comparison of image quality at varying exposure levels

Storage phosphor radiography of wrist fractures: a subjective comparison of image quality at varying exposure levels

Digitale Radiographie: Ist die Qualität der Röntgenaufnahmen am Monitor besser als am Leuchtkasten?

A paediatric X‐ray exposure chart

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