Contrast information of digital imaging in laser film digitizer and display monitor

Lo, Shih-Chung Benedict; Gaskill, Jerry W.; Mun, Seong Ki; Krasner, Brian

doi:10.1007/bf03170571

Cited by 17 publications

(7 citation statements)

References 5 publications

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“…The general approach taken to assess the signal, noise, and density range performance of the digitizers involved four steps, and is similar to that used in previous reports. [2][3][4][5][6][7] First, a step-wedge test film was created. Second, the test film was digitized using the four CCD-based units, and one laser film digitizer.…”

Section: Methodsmentioning

confidence: 99%

An evaluation of the signal and noise characteristics of four CCD‐based film digitizers

1998

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Film digitizers are common devices in radiology departments involved with picture archive and communication systems (PACS) and teleradiology. In this paper, we studied the performance of film digitizers based on charge-coupled device detectors (CCD digitizers), and compared this with the performance of a laser digitizer (the de facto standard). Our focus was on the assessment of signal, noise and useful optical density range performance. A function (L* delta D) derived from the Rose model was used to evaluate these parameters in absolute terms, based their predicted ability to detect objects of specific size and optical density difference with respect to background. We studied CCD digitizers from four different vendors and found that none was able to reliably operate up to the maximum density of 3.0 required to digitize plain radiographs, while the laser digitizer was capable of this task. Our analysis also indicated that two of the four CCD digitizers were adequate for digitizing laser-printed cross-sectional images in certain cases. Finally, our analysis indicated that digitization of SMPTE pattern films along with visual assessment of the 5% and 95% contrast patches was not sufficient for determining the utility of film digitizers for clinical tasks. Computation of the L* delta D function provides a useful means of assessing the performance of film digitizers (e.g., for acceptance testing and quality control), and this technique may be adaptable for evaluation of other digital imaging modalities.

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Section: Methodsmentioning

confidence: 99%

An evaluation of the signal and noise characteristics of four CCD‐based film digitizers

1998

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“…Some studies have found that the contrast resolution of a display is often substantially less in practice than that specified by the manufacturer. 26 In telemedicine applications based on videoconferencing, the picture rate is a factor and so too is the quality of sound.…”

Section: Information Displaymentioning

confidence: 99%

Evaluating telemedicine systems and services

Taylor

2005

J Telemed Telecare

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The evaluation of telemedicine involves attempts to answer a wide range of questions involved in making decisions about safety, about practicality and about utility. Roughly speaking, if we wish to provide a telemedicine service we should first establish that it is safe, next that it is practical and finally that it is worthwhile. In establishing safety, most laboratory studies of telemedicine have a common structure, and consist of the following steps: (1) selection of cases; (2) interpretation; (3) comparison with a gold standard; (4) statistical analyses. Most of the studies to establish the practicality of telemedicine have been carried out as demonstrations, to show that a proposed application can be implemented in a chosen setting. In terms of utility, telemedicine has been used to improve the efficiency of an existing service or to make an existing service available to a new community. One of the difficulties is that the vendors of relatively expensive telemedicine systems and services disseminate much of the information on the topic. We have to focus not on the glamorous technology but on the underlying issue of how the participants in health care (patients, general practitioners, specialists) can communicate more effectively, using the range of technological options open to them. Ensuring that the most appropriate technology is used in the most effective way should be the primary aim of telemedicine research. There is now sufficient evidence for us to be confident that telemedicine is a safe alternative to conventional care in a variety of situations and for a number of clinical conditions. Reliable evidence that it is a practical and cost-effective alternative is, at the time of writing, harder to find.

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“…3Y7 Other works attempt to calibrate film digitizers with respect to gray scale monitors, but did not have an accepted standard to base their results on. 8,9 The goal of this work is not to establish a quality control parameter, but to present a methodology to provide lookup tables (LUT) to individual images. These LUTs will transform the pixel values of the image data sets so that the luminance of displayed images will be equivalent to the original films as observed on a viewbox as defined by the GSDF.…”

Section: Introductionmentioning

confidence: 99%

Utilization of DICOM GSDF to Modify Lookup Tables for Images Acquired on Film Digitizers

Jones

2005

J Digit Imaging

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Contrast information of digital imaging in laser film digitizer and display monitor

Cited by 17 publications

References 5 publications

An evaluation of the signal and noise characteristics of four CCD‐based film digitizers

An evaluation of the signal and noise characteristics of four CCD‐based film digitizers

Evaluating telemedicine systems and services

Utilization of DICOM GSDF to Modify Lookup Tables for Images Acquired on Film Digitizers

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