By Z. H. Cho, J. B. Ra (auth.), Orhan Nalcioglu, Zang-Hee Cho (eds.)
ISBN-10: 3642932533
ISBN-13: 9783642932533
ISBN-10: 364293255X
ISBN-13: 9783642932557
The carrying on with progress of computed tomography (CT) and different imaging ideas influenced us to collect a accomplished evaluation of the state-of-the-art in diagnostic imaging. Twelve years after the 1st visual appeal of x-ray CT, automated diagnostic imaging has grown so swiftly in sophistication that it's tough to keep on with present advancements during this different box. during this publication, we now have tried to hide the fundamental advancements in numerous parts. the 1st half contains a number of the basic facets of automatic diagnostic imaging reminiscent of algorithms and detectors. particular functions in emission tomography, electronic radiography, ultrasound and nuclear magnetic resonance imaging are handled within the secondpart. The contributed papers are by way of specialists at present within the box, whom we suppose will surely enlighten the subject material and doubtless recommend instructions for destiny improvement. we want to specific our honest because of those that have contributed to this quantity. we're definite that their unique papers could be worthwhile for readers and also will stay as a massive reference for researchers within the future years. we might additionally prefer to thank Betty Trent for her specialist and sufferer typing of the complete publication. ultimately, specific thank you are as a result of Mrs. Ingeborg Mayer of Springer-Verlag for her encouragements, aid and persistence during the instruction of this book.
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Extra resources for Selected Topics in Image Science
Sample text
Fig. 4(a), (b) and (c) corresponding to eqs. (14), (15), and (16), respectively. A more uniform radial distribution is provided by eq. (16) where equalization of the radial sampling distances are systematically sought. The view angle distribution following eq. (16) was found to be near optimal as will be demonstrated later with the reconstructed images. (b) Higher order interpolation - Lagrange interpolation In addition to the optimized sampling technique discussed above, it was found that for high resolution imaging, a higher order interpolation was necessary.
B) (a) Fig. 2. " . BPC . ) • • • (. dW ( 8) • • • •• • •• ••• •• --~ • • • • M = ~e(i=l ), * fo r i 1,2 , ... , N, ( 14) In this case, the sampling dens i ty becomes sparse towards 45° and 1350 directions as illustrated in Fig. 2(b). This poor sampling and resulting interpolation errors near 45 ° and 1350 detrimentally affect the reconstructed images, especially for high resolution images such as the X-ray or NMR CT images where contrast resolutions of 0. 0% are common . Var i able angular sampling ( ~e : variable ) 47 To avoid difficulties due to the constant 68 , the vertical (or horizontal) distance betweeen neighboring sample points 61» (61)>) was held equal a y OX by increasing the number of views towards 45 and 135 directions.
C Images of direct Fourier transform techniques of Mersereau and Oppenheim. (a) Original equal angular interval (6 8 = constant) concentric square raster sampling, (b) equal distance (6W y or 6w ) concentric square raster sampling or variable angular interval concentric square sampling. (c) new optimized variable angular interval (6p= constant) concentric square raster sampling.
Selected Topics in Image Science by Z. H. Cho, J. B. Ra (auth.), Orhan Nalcioglu, Zang-Hee Cho (eds.)
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