By Walter Ameling (auth.), Jürgen Meyer MD, Peter Schweizer MD, Raimund Erbel MD (eds.)
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Extra resources for Advances in Noninvasive Cardiology: Ultrasound, computed tomography, radioisotopes, digital angiography
E) Quantitative Video-(Cine) angiocardiography with (biplane) electronic image and reference data acquisition, processing storage, retrieval. Analog or partial digital parameter extraction. X-ray equipment as "measuring tool". (f) Computerized processing of completely digitized image series: a: successively obtained images (digital projection angiocardiography); b: simultaneously obtained images (computer tomography); c: combination of both (dynamic spatial reconstruction). Figure 1 gives a survey on our efforts in this field starting in the mid-sixties.
The examination is done after the patient was fasted for about 8 hours. For sedation the patient usually receives 5 to 10 mg diazepam intravenously. Since fiber optics were replaced in this prototype, the probe is introduced blindly. An x-ray examination is performed in those patients where clinical history suggests a diverticulum of the esophagus. IDENTIFICATION OF THE SITUS OF THE HEART At a depth of about 40 cm from the patient's teeth the aorta ascendens at the level of the aortic root can usually be seen (Figure 2).
I.. "' ........ Figure 7. this graphic representation of a block of data obtained by digitizing a videoangiocardiographic image sequence should demonstrate the equalization of spatial and temporal coordinates and thereby the simultaneously available and mixable information about anatomy and function . This is one of the principle advantages of digital processing of image series. ertheless these new aspects attracted and stimulated clinicians and manufacturers which resulted in the first commercially available systems for digital subtraction angiography in 1980/1981.
Advances in Noninvasive Cardiology: Ultrasound, computed tomography, radioisotopes, digital angiography by Walter Ameling (auth.), Jürgen Meyer MD, Peter Schweizer MD, Raimund Erbel MD (eds.)