By Walter Ameling (auth.), Jürgen Meyer MD, Peter Schweizer MD, Raimund Erbel MD (eds.)
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Extra info for Advances in Noninvasive Cardiology: Ultrasound, computed tomography, radioisotopes, digital angiography
This difficulty is further compounded by large pools of blood such as, for example, the cardiac chambers and the intramyocardial vascular space, both of which contain activity. This activity can lead to considerable cross-contamination of 0- 15 activity between the blood pools and myocardial tissues. It appears however that these shortcomings 47 can largely be overcome by methods that allow corrections for activity crosscontamination or with the newer generation of high performance positron tomographs with improved temporal and spatial resolution.
By contrast, in 31 of the 32 patients with coronary artery disease, the myocardial distribution ofN-13 activity became highly inhomogenous after dipyridamole and new or more extensive defects in regional N-13 concentrations were observed. A typical example is shown in Figure 2. Through quantitative analysis of the PositronCT images, these new defects were caused by attenuated increases in N-13 concentrations in segments supplied by stenosed coronary arteries as compared to 41 Figure 2. Control and hyperemic cross-sectional positron computed tomographic images of the myocardial N-13 ammonia distribution in a 67 year old woman with 100% stenosis of the proximal left anterior descending coronary artery.
CLINICAL IMPLICATIONS OF TRANSESOPHAGEAL ECHOCARDIOGRAPHY PRESENT STATUS AND FUTURE ASPECTS PE1ER HANRATH, MICHAEL SCHLU1ER, WOLFGANG THIER, BURKHART A. LANGENS1EIN AND WAL1ER BLEIFELD Imaging of the heart and its motion can provide valuable diagnostic information. However, cardiac imaging from standard transthoracic transducer locations can be compromised in a certain percentage of patients, mainly by the interposition of ribs and air-containing lung tissue between the ultrasound transducer and the target.
Advances in Noninvasive Cardiology: Ultrasound, computed tomography, radioisotopes, digital angiography by Walter Ameling (auth.), Jürgen Meyer MD, Peter Schweizer MD, Raimund Erbel MD (eds.)