Archives for coronary angiography: a comparison of cinefilm vs. video vs. digital
ABSTRACT The appropriate storage and archiving of angiographic images and
data still represents a major problem in coronary angiography. Usually
one of these three physical media is used: cine film, videotape, or
digital storage. The properties of these different archive tapes are
analyzed by comparing their benefits for clinical practice. The most
important criterion for clinical diagnosis is the image quality.
Extensive studies have been performed to compare images from digital
storage, digitized cine film, VHS videotape, and worn videotape. By
using special X-ray phantoms, various image properties were measured.
The results show that digital images have the best quality in terms of
noise, sharpness, and pointspreading. Cine film has advantages in
spatial resolution, but disadvantages in contrast. The video images,
especially those from worn tape, have a dramatic loss of spatial
resolution and sharpness. Digital technology offers several progressions
like online enhancement, fast accessibility, quantitative coronary
analysis, data integration, communication, and telemedicine
Article: Accurate visualization and quantification of coronary vasculature by 3-D/4-D fusion from biplane angiography and intravascular ultrasound[show abstract] [hide abstract]
ABSTRACT: In the rapidly evolving field of intravascular ultrasound (IVUS) for tissue characterization and visualization, the assessment of vessel morphology still lacks a geometrically correct 3-D reconstruction. The IVUS frames are usually stacked up to form a straight vessel, neglecting curvature and the axial twisting of the catheter during the pullback. This paper presents a comprehensive system for geometrically correct reconstruction of IVUS images by fusion with biplane angiography, thus combining the advantages of both modalities. Vessel cross-section and tissue characteristics are obtained from IVUS, while the 3-D locations are derived by geometrical reconstruction from the angiographic projections. ECG-based timing ensures a proper match of the image data with the respective heart phase. The fusion is performed for each heart phase individually, thus yielding the 4-D data as a set of 3-D reconstructions.