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Volume 69, Issue 1
Displaying 1-9 of 9 articles from this issue
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Nobuyuki IWASAKI2006 Volume 69 Issue 1 Pages 3-9
Published: February 25, 2006
Released on J-STAGE: February 17, 2011
JOURNAL FREE ACCESSAnalog and digital imaging technologies for mammography are outlined.View full abstractDownload PDF (3597K) -
Atsushi OHISHI2006 Volume 69 Issue 1 Pages 10-15
Published: February 25, 2006
Released on J-STAGE: February 17, 2011
JOURNAL FREE ACCESSImage display technology of digital mammography is described. The guideline of image quality design about tone reproduction and special frequency is discussed firstly. Next outlines of available image display equipments are introduced. Further, laser imager and LCD display are focused, and their features are compared in relation to mammography.View full abstractDownload PDF (3507K) -
Image Processing Techniques in MammographyHiroshi FUJITA2006 Volume 69 Issue 1 Pages 16-22
Published: February 25, 2006
Released on J-STAGE: February 17, 2011
JOURNAL FREE ACCESSCurrently, the trend of utilizing digital image information is emerging in all fields, and the field of medical imaging is not an exception. One of the benefits of use of digital imaging is the potential of “image processing technology, ” which may overcome or “compensate” the disadvantage of digital images used in current medicine whose image quality is not superior to, or in a sense even not yet similar to that of analog (film) images. In addition, this technology is expected to enable enhancement of the signal (disease (s) on an image). Specific image processing techniques are also undergoing developments with the progress in imaging modalities (hardware), such as energy subtraction and tomosynthesis to obtain tomographic images. Moreover, the computer-aided diagnosis (CAD) system is being developed as an ultimate image processing tool that can be used for obtaining a second opinion by a physician. CAD detects the possible locations of the diseases on the image and/or performs the process of classification based on their malignancy. The commercialization of CAD has commenced in several fields of diagnostic imaging, such as mammography. In this paper, image processing techniques for mammography and CAD have been reviewed. The issues that need to be solved and the future prospects of these modern technologies are also discussed.View full abstractDownload PDF (1976K) -
Report of Panel DiscussionMasao MATSUMOTO2006 Volume 69 Issue 1 Pages 23-26
Published: February 25, 2006
Released on J-STAGE: February 17, 2011
JOURNAL FREE ACCESSDownload PDF (625K) -
Kazuhiko SEKI2006 Volume 69 Issue 1 Pages 28-34
Published: February 25, 2006
Released on J-STAGE: February 17, 2011
JOURNAL FREE ACCESSRecently there is rapid progress in organic thin films electronic devices and molecular-scale electronics. In many of these devices, interfaces formed between an organic molecular layer with a metal and another organic layer play important role, and their structure and electronic structure attract much attention. In this article we review the studies on (1) electronic energy level alignment right at the interface, (2) far-reaching effect due to electrostatic effect, such as band bending and various types of doping, and (3) other related phenomena and the prospects for the future, based mostly on the research group of the author.View full abstractDownload PDF (1622K) -
Tadaaki TANI2006 Volume 69 Issue 1 Pages 35-41
Published: February 25, 2006
Released on J-STAGE: February 17, 2011
JOURNAL FREE ACCESSSpectral sensitizers in silver halide photographic materials are monomolecular layers of J-aggregated cyanine dyes on silver halide (AgX) grains, and are regarded as thin organic semiconductor layers with thickness of about 1nm. The light absorption of a photon by the aggregate forms an exciton, which migrates in it and furthermore among aggregates within a picosecond, and dissociates to inject an electron into an AgX grain in several tens picoseconds. On the contrary, sensitizing dye molecules in a dye-sensitized solar cell act independently on titanium dioxide grains, and inject electrons into the grains within 100 femtoseconds. The electronic structure of the interface between a dye and AgX was traditionally constructed by aligning their vacuum levels, and could not explain the difference in photographic performance between sensitizing dyes and desensitizing ones. The systematic UPS measurement of the electronic structure of the interfaces between merocyanine dyes and AgBr with respect to the Fermi level of Ag used as their substrate was made in collaboration with K. Seki and others, and indicated the electronic structure characterized by the fact that the vacuum levels of all the dyes studied was considerably lower than that of AgBr. The electronic structure thus obtained could successfully explain the difference between sensitizing dyes and desensitizing ones. Discussions are made on the causes for the displacement of the vacuum levels of dyes with respect to that of AgBr.View full abstractDownload PDF (1089K) -
Jun-ichi HANNA2006 Volume 69 Issue 1 Pages 42-47
Published: February 25, 2006
Released on J-STAGE: February 17, 2011
JOURNAL FREE ACCESSThe basic properties of self-organizing molecular semiconductors (SOMS), which are a promising material aimed at optoelectronic devices for imaging allocations devices, are briefly reviewed, and the charge injection characteristics at the interface of electrode/SOMS are discussed based on the basic properties of charge carrier transport in the SOMS, with reference to those of the electrode/amorphous organic semiconductors.View full abstractDownload PDF (1221K) -
Takayuki UCHIDA, Masao OHTSUKA2006 Volume 69 Issue 1 Pages 48-54
Published: February 25, 2006
Released on J-STAGE: February 17, 2011
JOURNAL FREE ACCESSTransparent organic light emitting devices (TOLEDs) with the transparent top and bottom electrodes were fabricated. The fundamental technologies for the device-fabrication are shown together with the overview of development of TOLED. For the fabrication of TOLED, both low damage sputtering technique and technology to achieve high efficiency of electron injection from the cathode of transparent conducting oxide (TCO) film, are key issues. Focusing on the carrier injection to the organic layer, the trend of development of the high efficient devices is introducedView full abstractDownload PDF (2287K) -
Masahiro ICHIHARA, Takayuki UCHIDA, Shingo KANETA, Thoru TAMURA, Masao ...2006 Volume 69 Issue 1 Pages 55-58
Published: February 25, 2006
Released on J-STAGE: February 17, 2011
JOURNAL FREE ACCESSTransparent organic light emitting device of each color (red (R), green (G) and blue (B)) with the transparent upper and bottom electrodes, has been fabricated successfully. Each color device is transparent when light is not emitted. Utilizing this feature, we tried to fabricate a full color pixel by stacking each device vertically, which was fabricated separately. And then, we evaluated the pixel. Each specific spectrum was observed when each device in the pixel was turned on and white light was observed when all the devices were turned on. Because we fabricate each device of R, G, B, separately and then stack them, either dry or wet process will be adopted without taking care of the intermingling of process.View full abstractDownload PDF (1339K)
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