Download e-book for kindle: Biomedical Information Technology (Biomedical Engineering) by David Dagan Feng

By David Dagan Feng

ISBN-10: 008055072X

ISBN-13: 9780080550725

ISBN-10: 0123735831

ISBN-13: 9780123735836

The large progress within the box of biotechnology necessitates the usage of knowledge know-how for the administration, circulation and association of information. the sector keeps to conform with the advance of latest functions to slot the desires of the biomedicine. From molecular imaging to healthcare wisdom administration, the garage, entry and research of information contributes considerably to biomedical learn and perform. All biomedical execs can take advantage of a better figuring out of ways info may be successfully controlled and applied via information compression, modelling, processing, registration, visualization, communique, and large-scale organic computing. moreover the publication comprises useful built-in scientific purposes for sickness detection, analysis, surgical procedure, remedy, and biomedical wisdom discovery, together with the most recent advances within the box, akin to ubiquitous M-Health structures and molecular imaging functions. *The world's such a lot well-known professionals provide their "best practices" prepared for implementation *Provides execs with the hottest and project serious instruments to judge the most recent advances within the box and present built-in medical applications*Gives new employees the technological basics and updates skilled pros with the most recent functional built-in scientific purposes

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Example text

Since the attenuation coefficient is measured for 100 keV g-rays, a fixed multiplication factor is used to convert these numbers to 140 keV. The attenuation map is calculated from the transmission projections using filtered backprojection. The second step in data processing is scatter correction, which must be performed on a pixel-by-pixel basis, since the number of scattered g-rays is not spatially uniform. The most common method uses dual-energy window detection: One energy window is centered at 140 keV with a fractional width (Wm ) of $20%, and a ‘‘subwindow’’ is centered at 121 keV with a fractional width (Ws ) of $7%.

Anti-parallel g-rays strike pairs of detectors that form a line integral for filtered backprojection. (b) Abdominal PET study using FDG with hot spots indicating the presence of small tumors. introduced into PET imaging, as it can for CT, by having a number of detector rings stacked adjacent to one another. Each ring typically consists of 16 ‘‘buckets’’ of 8 Â 8 blocks of scintillation crystals, each block coupled to either 16 (BGO) or 4 (LSO) PMTs. The number of rings in a high-end multislice PET scanner can be up to 48.

When the effects of T1 and T2 relaxation are taken into account, it can be shown that in a gradient–echo sequence, the image intensity I(x,y) is given by: À Á Ã rðx, y Þ 1 À eÀTR=T 1 eÀTE=T 2 sin a I ðx, y Þ / , (1:27) 1 À eÀTR=T 1 cos a where T2Ã is the spin–spin relaxation time, including the effects of magnetic field inhomogeneity. For a spin-echo imaging sequence, the corresponding expression is:   (1:28) I ðx, y Þ / rðx, y Þ 1 À eÀTR=T 1 eÀTE=T 2 : The times TR and TE within the imaging sequence can be chosen to give different contrasts in the image.

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Biomedical Information Technology (Biomedical Engineering) by David Dagan Feng

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