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Electronic structure classifications using scanning tunneling microscopy conductance imaging (1998)

Horn, K. M. ; Swartzentruber, B. S. ; Osbourn, G. C. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 84 (1998), S. 2487-2496

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The electronic structure of atomic surfaces is imaged by applying multivariate image classification techniques to multibias conductance data measured using scanning tunneling microscopy. Image pixels are grouped into classes according to shared conductance characteristics. The image pixels, when color coded by class, produce an image that chemically distinguishes surface electronic features over the entire area of a multibias conductance image. Such "classed" images reveal surface features not always evident in a topograph. This article describes the experimental technique used to record multibias conductance images, how image pixels are grouped in a mathematical, classification space, how a computed grouping algorithm can be employed to group pixels with similar conductance characteristics in any number of dimensions, and finally how the quality of the resulting classed images can be evaluated using a computed, combinatorial analysis of the full dimensional space in which the classification is performed. © 1998 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.368409

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Bone scintigraphy in osteonecrosis of the femoral condyle (1997)

Liehn, J. -Cl. ; Wampach, H. ; Bouchard, A. ; [et al.]

Springer

European journal of orthopaedic surgery & traumatology 7 (1997), S. 263-265

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ISSN: 1432-1068

Keywords: Osteonecrossi ; Femoral ; condyle ; Scintigraphy ; Ostéonécrose ; Condyle fémoral ; Scintigraphie

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Description / Table of Contents: Résumé La scintigraphie osseuse dite “trois phases” permet de visualier et de quantifier le débit sanguin relatif, le pool vasculaire et l'activité ostéoblastique des condyles fémoraux. Ces dernières années, les progrès des gamma caméras ont permis d'obtenir des images de bien mellieure qualité. La sémiologie de la scintigraphie “trois phases” dans l'ostéonécrose des condlyes fémoraux permet de distinguer les aspects aigus, subaigus et tardifs. La scintigraphie peut également apporter des informations pronostiques. Par rapport à l'IRM, la scintigraphie a un intérêt particulier quand d'autres articulations, voire l'ensemble du squelette doivent être explorés.

Notes: Summary Three-phase bone scan visualises and quantifies the blood flow, blood pool and osteoblastic activity in the femoral condyles. The recent improvement in gamma cameras allows high quality images to be obtained. Analysis of the three phases of bone scan makes it possible to dintinguish the features of acute, subacute and late osteonecrosis. Bone scan also provides prognostic information. As compared to MRI, bone scan is of particular value when other joints or even the entire skeleton need to be investigated.