By O. Nickel (auth.), N. Schad, E. J. Andrews Jr., J. W. Fleming (eds.)
For a long time, clinicians have trusted cardiac marily be categorised into camps
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Extra resources for Colour Atlas of First Pass Functional Imaging of the Heart
7). 8). An evaluation of 34 patients during cardiac catheterization showed that an RAO projection of 20° separated the aorta from the right heart border in all but eight patients. Only two required greater than 30° for separation of the inferior heart border and aorta (Fleming, 1982). Dymond et al. (1982) reported their observations of the influence on RNV of the site of radionuclide injection (right or left arm) and projection (RAO or LAO). They stressed the need for quality control of the bolus of injected radionuclide.
The opacified aorta overlies the base and inferior margin of the left ventricle in this anterior projection. 6 The RAG projection, contrast ventriculogram. The opacified aorta clearly is removed from the area of the left ventriculogram by rotation of the patient 30° in the RAO projection. 7 First pass radionuclide ventriculogram in anterior projection. This regional ejection fraction image shows marked diminution in 'wall motion' or changes in count inferiorly. 6. This suggests that unchanging counts in the aorta may interfere with computerized interpretation of wall motion changes when the aorta overlies the base and inferior border of the left ventricle in the anterior position.
Despite the short time-interval of rapid filling lasting only about 200 ms and the few images available for processing (see above), the areas with reduced compliance are very distinct and usually easier to delineate than on first and second half systolic functional images. Both systolic ejection rate images and diastolic rapid filling rate images frequently show alterations at rest which deteriorate during exercise. In areas lacking significant rapid inflow the rapid filling decrease image may even show predominant 'paradoxical' inward motion or lack of any segmental motion during this initial diastolic time interval.
Colour Atlas of First Pass Functional Imaging of the Heart by O. Nickel (auth.), N. Schad, E. J. Andrews Jr., J. W. Fleming (eds.)