MYOCARDIAL BLOOD FLOW: ROENTGEN VIDEODENSITOMETRY TECHNIQUES.

Hugh C. Smith, Richard A. Robb, Earl H. Wood

Research output: Contribution to conferencePaper

1 Scopus citations

Abstract

Roen videodensitometry is a technique for obtaining objective measurements of the dilution and transport of radiopaque indicator in the circulatory system. The continuous roentgen angiographic image is recorded on videotape during cardiac catheterization, and during replay of the videotape, digital computer analysis of roentgen density at selected sites within the recorded image can be performed. The image brightness or roentgen density at any point in the circulation is determined by the intensity radiation transmitted through that site. This x-ray transmission is altered by the presence of radiopaque indicator according to the Lambert-Beer law for monochromatic radiation. Because the specific absorption coefficient and incident radiation are constant during the angiographic procedure, measured changes in x-ray density (transmitted radiation) indicate the amount (concentration and depth) of the indicator - bloom mixture being transradiated. While conventional x-ray equipment does not generate monochromatic radiation, the use of suitable copper filters greatly narrows the spectral band of radiation employed.

Original languageEnglish (US)
Pages225-232
Number of pages8
StatePublished - Jan 1 1975
EventCardiovasc Imaging and Image Process, Theory and Pract $—$ 1975 - Stanford, CA, USA
Duration: Jul 10 1975Jul 12 1975

Conference

ConferenceCardiovasc Imaging and Image Process, Theory and Pract $—$ 1975
CityStanford, CA, USA
Period7/10/757/12/75

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Smith, H. C., Robb, R. A., & Wood, E. H. (1975). MYOCARDIAL BLOOD FLOW: ROENTGEN VIDEODENSITOMETRY TECHNIQUES.. 225-232. Paper presented at Cardiovasc Imaging and Image Process, Theory and Pract $—$ 1975, Stanford, CA, USA, .