Standard and High-Scan-Line Television Systems

Templeton, Arch W.; Dwyer, Samuel J.; Jansen, Carl; Garrotto, Lewis J.; Rathke, James E.; Tolan, John H

doi:10.1148/91.4.725

Cited by 4 publications

(2 citation statements)

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“…However, in the cardiac catheterization laboratory we are working with relatively low light levels and low-contrast subject material (gray vessels on a gray background, not black on white). Consequently, as Gould has recently pointed out [19], and as noted 15 years ago [ 1,2], higher bandwidth systems usually do not provide the expected gain in diagnostic image quality-especially for low-contrast images.…”

Section: Discussionmentioning

confidence: 99%

“…In the past, studies have indicated that it may not be necessary to use high line rate TV systems (in excess of the broadcast standard 525-line systems) or high bandwidth systems (in excess of 5 MHz) [1,2]. These studies point out that even though high line rate and high bandwidth systems do provide improved image quality for high-contrast images, these advantages which are normally associated with improved image quality actually reduce the quality of the image owing to an increase in image noise content.…”

Section: Introductionmentioning

confidence: 99%

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Technical considerations for cardiac laboratory high‐definition video systems

Gray

Wondrow

Smith

et al. 1984

Cathet. Cardiovasc. Diagn.

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With the expanding use of video systems in diagnostic imaging a significant benefit could be obtained by applying this technology in the cardiac catheterization laboratory. Reduced radiation exposure to the patient and staff, reduced examination cost by the elimination of cine film and equipment (cameras, processors, etc), and instant replay of each injection would result in improved patient care. We discuss the technical parameters of a video system which we have found suitable for diagnostic purposes and describe how this system is used on a day-to-day basis. In addition, the technical aspects of higher bandwidth, higher line rate systems is presented, and we show that these more sophisticated systems provide no advantage over conventional high-definition television and, in fact, degrade the diagnostic quality of the image.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Technical considerations for cardiac laboratory high‐definition video systems

Gray

Wondrow

Smith

et al. 1984

Cathet. Cardiovasc. Diagn.

View full text Add to dashboard Cite

show abstract

Requirements on resolution of digital imaging equipment in the cardiac catheterization laboratory

et al. 1988

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We evaluated the requirements on spatial resolution of digital imaging equipment in the cardiac catheterization laboratory. Fifty cinefilms of the heart as the biological object and one film of a lead-ladder-pattern as an objective test were used. The patient films were examined for the visibility of the left ventricular angiogram, coronary arterial tree, coronary artery lesions, branching of septal arteries and the number of septal arteries. All films were viewed three times: with a 625 line TV-system, with a 1249 line TV-system and with a cineprojector. It was found that two application areas with different demands on the spatial and temporal resolution can be distinguished: 1) low spatial resolution and high temporal resolution, e.g. left ventriculography; and 2) high spatial resolution and low temporal resolution, e.g. coronary arteriography. For the diagnostic assessment of the state of the coronary system, the spatial resolution provided by the 1249 line TV-system was sufficient. Exceeding this resolution by using cinefilm quality provided no additional diagnostic information. A frame rate lower than 50 frames per second for coronary arteriography seems possible.

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