AbstractAbstract
[en] The authors state in their preface:''...we believe that there is no book yet available in which computing in nuclear medicine has been approached in a reasonable manner. This book is our attempt to correct the situation.'' The book is divided into four sections: (1) Clinical Applications of Quantitative Scintigraphic Analysis; (2) Mathematical Derivations; (3) Processing Methods of Scintigraphic Images; and (4) The (Computer) System. Section 1 has chapters on quantitative approaches to congenital and acquired heart diseases, nephrology and urology, and pulmonary medicine
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1983; 296 p; Raven; New York, NY (USA); From review by R.A. Hawkins, Univ. of California, Los Angeles, in AJR, Am. J. Roentgenol., Vol. 141, No. 5, 936(Nov. 1983).
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AbstractAbstract
[en] A priori, the requirements of flexibility versus ease of use seem antagonistic in dedicated scintigraphic computer systems. This follows from the fact that flexibility is most often achieved by multiplicity of options. In many cases, the flow through the options is directed by decision trees or menus, which have the major disadvantage of requiring multiple, and repetitive answers to often obscure questions. Alternatively the direct call to the program library requires that the operator remember the name of all available programs, which are often mnemonic by courtesy only. Ease of use on the other hand is most often attained by a menu structure with few levels, and rigid data structures. In this paper, the authors briefly describe an attempt to reconcile the requirements, based on Forth, in which the first access of the user is to a two layer menu directing to predefined and well established protocols but further and progressive access to stringing of simple commands and primitives. (Auth.)
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Bacharach, S.L. (ed.) (National Institutes of Health, Bethesda, MD (USA). Dept. of Nuclear Medicine); 564 p; ISBN 0-89838-787-6; ; 1986; p. 92-97; Martinus Nijhoff; Dordrecht (Netherlands); 9. Conference on information processing in medical imaging; Washington, DC (USA); 10-14 Jun 1985
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AbstractAbstract
[en] The phase of the first harmonic, used in functional images of gated cardiac studies is used to determine the regional variations in the timing of the systolic cycle. It has been shown, however, theoretically and empirically, that the influence of various events during systole on the final phase is complex. Systolic events related to the contraction are, in order the time of beginning of systole or the inflection time of the curve (T1), the time at which the maximum contraction rate is reached (T2), the time of systole (T3), and the time of maximum filling rate (T4). We have computed those T values on a point-by-point basis using the coefficients of harmonics 0,1,2,3 and have constructed functional maps of T's to be compared to the phase map P. As expected, our findings indicate that T3 tends to correlate with P but that undistinguishable P maps can correspond to a variety of abnormalities in T1, T2, T3, or T4. Furthermore, in a significant number of cases where during stress testing P hardly seems affected, one can distinguish significant changes in some of the T maps. We conclude that the theoretical limitations of first harmonic phase analysis have a real clinical impact, which can be overcome by a more rigorous analysis
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Raynaud, C. (ed.); 1172 p; ISBN 0-08-027089-1; ; 1982; v. 1 p. 46-49; Pergamon; Paris (France); 3. World congress of nuclear medicine and biology; Paris (France); 29 Aug - 2 Sep 1982
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[en] A method is presented by which tomographic myocardial perfusion data are prepared for quantitative analysis. The method is characterized by an interrogation of the original data, which results in a size and shape normalization. The method is analogous to the circumferential profile methods used in planar scintigraphy but requires a polar-to-cartesian transformation from three to two dimensions. As was the case in the planar situation, centering and reorientation are explicit. The degree of data reduction is evaluated by reconstructing idealized three-dimensional data from the two-dimensional sampling vectors. The method differs from previously described approaches by the absence in the resulting vector of a coordinate reflecting cartesian coordinate in the original data (slice number)
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[en] The precise delineation of the left ventricular projection area is an essential part in the quantitative analysis of nuclear angiocardiograms. We have devised an algorithm that permits automation of this step, based on a one-dimensional Laplace operator whose kernel is 2, 2, -2, -4, -2, 2, 2. The operator characteristically enhances 'valleys' more than edges and, therefore, favors septal and the valve plane detection. The operator is applied vertically, horizontally, and along both diagonals. Each pass is immediately followed by a local maximum search during which the image resulting from the Laplacian operator is reduced to a binary one, with zeros every where except where a local maximum was found along the path of the operator. This resultant image yields a closed 'edge' around the left ventricle, even though many structures outside the left ventricle are also delineated. However, the centroid of the ventricle is defined from functional criteria and the region of interest is defined from centroid to first edge. The method has been applied to first-pass and gated studies in anterior and 450 left anterior oblique views. In 100 successive cases the ejection fraction obtained automatically was compared to the manual result. (orig./MG)
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Cardiovascular and Interventional Radiology; ISSN 0174-1551; ; (no.4); p. 117-123
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Goris, M.L.; Briandet, P.A.; Huffer, Elizabeth
Information processing in medical imaging, Paris, 2-6 July 19791980
Information processing in medical imaging, Paris, 2-6 July 19791980
AbstractAbstract
[en] The scientific validity of a method requires in final analysis that the results are independent of the user. This statement which would in other circumstances appear tautological is actually controversial in nuclear medicine, where the skill of the operator tends to be valued. But if the operator is interested in the outcome of the quantitative analysis and operator bias is allowed, the value of quantitation per se is lost. We have developed a set of algorithms which allows full automation in the analysis of ventilation-perfusion studies and in the detection of left-to-right intracardiac shunting, and which except for the identification of the valve planes, allows full automation in the processing of nuclear angiocardiography (First Pass or ECG Gated) for LV function analysis
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Di Paola, Robert; Kahn, Edmond (eds.); Les Colloques de l'INSERM; v. 88; p. 427-448; ISBN 2-85598-191-3; ; 1980; p. 427-448; INSERM; Paris, France; INSERM international colloquium on information processing in medical imaging; Paris, France; 2 - 6 Jul 1979
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