Quantitative assessment of a new dental imaging system

Walker, Anne; Horner, Keith; Czajka, Jaddy; Shearer, Ann; Wilson, Nairn

doi:10.1259/0007-1285-64-762-529

Cited by 30 publications

(12 citation statements)

References 4 publications

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“…Similar findings were observed in this study [17-19]. The histogram equalization algorithm converts the histogram of an original image to an equalized histogram; in other words, it changes the use of available grey values and the characteristics of the histogram [3].…”

Section: Discussionsupporting

confidence: 83%

Evaluation of a Mathematical Model for Digital Image Enhancement

Geha¹,

Nasseh²,

Noujeim³

2015

TODENTJ

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Objective : The purpose of this study is to compare the detected number of holes on a stepwedge on images resulting from the application of the 5th degree polynomial model compared to the images resulting from the application of linear enhancement. Material and Methods : A 10-step aluminum step wedge with holes randomly drilled on each step was exposed with three different kVp and five exposure times per kVp on a Schick33® sensor. The images were enhanced by brightness/contrast adjustment, histogram equalization and with the 5th degree polynomial model and compared to the original non-enhanced images by six observers in two separate readings. Results : There was no significant difference between the readers and between the first and second reading. There was a significant three-factor interaction among Method, Exposure time, and kVp in detecting holes. The overall pattern was: “Poly” results in the highest counts, “Original” in the lowest counts, with “B/C” and “Equalized” intermediate. Conclusion : The 5th degree polynomial model showed more holes when compared to the other modalities.

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Section: Discussionsupporting

confidence: 83%

Evaluation of a Mathematical Model for Digital Image Enhancement

Geha¹,

Nasseh²,

Noujeim³

2015

TODENTJ

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“…In contrast to the original RVG model documented in the literature [Horner et al, 1990;Walker et al, 1991] which required 0.4 times the exposure of E speed film, the improved Mark 2 (Mark 2 mobile) system employed in this study requires only 0.2-0.3 times the exposure re quired for E speed film. This conclusion was reached by the authors following measurement of air kerma by means of an ionisation chamber in the primary beam, for E speed and RVG settings of the improved system's CCX timer (at film setting 5, which is required for E speed, dose = 0.9-1.1 mGy, whereas for RVG at the same setting, dose = 0.2-0.3 mGy).…”

Section: Radiovisiographymentioning

confidence: 93%

Radiovisiographic Diagnosis of Dental Caries: Initial Comparison of Basic Mode Videoprints with Bitewing Radiography

Russell

Pitts²

1993

Caries Res

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Radiovisiography (RVG) is a commercially available, dental radiographic digital imaging system which is claimed to rival conventional techniques in terms of decreased radiation dose and the production of instantaneous images. The aim of this study was to compare in vitro the sensitivities and specificities derived from three examiners using conventional bitewing radiographic film (D and E speed) with those achieved by the same examiners using basic mode RVG bitewing videoprints of occlusal and approximal caries. Videoprints were used in this study, as they are the principal method of archiving radiovisiographic images, unless a separate compatible personal computer is used. The histological appearance of the subsequently sectioned teeth was used as the validating criterion. The in vitro results of basic mode RVG suggest that for occlusal caries, overall the sensitivity and specificity of RVG videoprints are similar to those of bitewing radiography. For approximal caries, the specificity of RVG videoprints was similar to that of bitewing radiography, but the sensitivity was slightly lower. Further work using the different modes available and electronically modified images is indicated.

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“…There is therefore a potential for dose reduction with the "faster" direct digital systems. All previously available direct digital imaging systems for intraoral radiography have been based on charge coupled device (CCD) technology [2][3][4][5]. Exposure reductions of approximately 50% have been reported for such systems.…”

mentioning

confidence: 99%

The imaging performance of a storage phosphor system for dental radiography

Brettle¹,

Workman²,

Ellwood³

et al. 1996

The British Journal of Radiology

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Direct digital imaging systems are becoming increasingly common in dental radiography. The majority of these systems are based on charge coupled device (CCD) technology. A relatively new system, based on photo-stimulable phosphor luminescence (PSPL), is now commercially available. This system appears to overcome some of the restrictions of CCD systems including those associated with the bulky detector, connecting wire, limited image size and limited exposure latitude. A physical evaluation of the PSPL system was conducted including measurements of sensitometric response, modulation transfer function (MTF), noise power spectrum (NPS), noise equivalent quanta (NEQ) and detective quantum efficiency (DQE). These measurements were compared with results obtained previously for Kodak Ektaspeed (E-speed) film. The results of the evaluation indicate that the PSPL system may be capable of operating at exposures up to 80% lower than for film with comparable image quality.

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Quantitative assessment of a new dental imaging system

Cited by 30 publications

References 4 publications

Evaluation of a Mathematical Model for Digital Image Enhancement

Evaluation of a Mathematical Model for Digital Image Enhancement

Radiovisiographic Diagnosis of Dental Caries: Initial Comparison of Basic Mode Videoprints with Bitewing Radiography

The imaging performance of a storage phosphor system for dental radiography

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