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By R.P. van Wijk van Brievingh
2. Vidicor three. Anacor four. Digicor five. Magnetic Recording of the Videosignal VI. GEOMETRIC version I. creation 2. Survey of types three. guidance of Casts four. Index of Irregularity five. In Vitro exams VII. DETECTION OF THE VENTRICULAR CONTOUR I. creation 2. Semi-automatic tools three. The effect of the expert Operator four. Conclusions VIII. info CONVERSION 1. advent 2. Light-pen approach and Contour reminiscence three. Digicor four. review technique five. information Presentation IX. software program process 1. advent 2. Modular constitution three. information Conversion four. quantity Calculation five. facts Presentation 6. detailed courses X. IN VIVO checks 1. advent 2. fabrics and strategies three. effects XI. UNCERTAINTY research I. advent 2. Uncertainty periods for correct Variables Propagation three. of Uncertainty four. Uncertainty period within the consequence XII. dialogue XIII. APPENDIX 1. thesaurus 2. Dedvations three. effects XIV. REFERENCES 1. Literature 2. inner experiences ACKNOWLEDGEMENTS VIII Illustrations determine Block-diagram of Instrumentation 12 1. 1 vital Synchronization 17 2. 1 2. 2 influence of Scattered Radiation (Biplane) 18 Block-diagram of X-ray/TV-system 2. three 21 2. four Test-object for OTF-measurement 25 Spatial Responses and Optical move features 2. five 26 Deviation from Isoplanasy and effect of extra gear 2. 6 28 2. 7 Temporal Modulation move functionality Curves 31 2. eight Biplane Projections 33 2. nine X-ray Aiming machine 36 2. 10 Calibration Curve 37 three. 1 focus vs. Tube Voltage Curves forty five three. 2 Markers and Applicators forty eight three. 3.
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R" ... B. All spatial frequencies are given with reference to the object plane. Fig. 2. Bruin,Image Quality Group, Philips Medical Systems Division, for their assistance in obtaining the curves of Figs. 6. 29 by a water-equivalent absorber of 20 cm thickness placed around the lead edge absorber. During this measurement, the BUCKY-filters have been inserted, to reproduce the situation as used in clinical practice. In this approach, the image deterioration caused by the system is judged on the basis of the amplitude spectrum of spatial frequencies describing the output image, compared with the input spectrum.
Left: Frame with gold wires. Right: Edge with scattering material. The complex OTFs is computed with its modulus (MTFs) and phase (PTF s ) as a function of spatial frequency. Strictly speaking, because the system is not shift invariant, no OTFs can be defined. In approximation, however, an averaged OTFs may be defined in patches with nearly constant geometry. The location of these regions have been indicated in the insert of Fig. 6. The effect of stray radiation has been accounted for ')The design, based on suggestions by F.
The transmission of the activation to the ventricles includes a time delay regulated by the specific conduction system (REETRAAR,1972). This is especially a problem in the case atrial fibrillation is present or simulated by a stimulation programme. Atrial fibrillation gives rise to irregular ventricular contractions, due to effects of atrial impulses on conduction through the atrio-ventricular node. This phenomenon can be described by a statistical model (TEN ROOPEN, 1966), and explained by scaling of the rate of atrial impulses by the atrio-ventricular conduction system (BOOTSMA,1970).