The median time of brain metastasis from the diagnosis of breast cancer is approximately 3 years. In this case report, a 69-year-old woman demonstrated cerebellar ataxia. Brain magnetic resonance ...imaging revealed enhanced lesions in bilateral cerebellar hemispheres. She had undergone surgery, radiation, and chemotherapy for uterine and breast cancer 24 years prior and 16 years prior, respectively. Although she had not received any anticancer treatment for 10 years, no recurrences were identified using whole body scans. A partial tumor resection was performed and the histological diagnosis was an adenocarcinoma from breast cancer. As no extracranial lesions were found, gamma-knife irradiation was performed, without additional systemic chemotherapy. One month posttreatment, the tumors dramatically reduced in size and the patient completely recovered from cerebellar ataxia. Systemic chemotherapy is not always required for brain metastasis from breast cancer with a long interval period, as long as no evidence of extracranial recurrence is detected.
The multi-gigahertz frequency comb-based interferometer exhibits only the interference amplitude peak without the phase fringes, which can produce a rapid axial scan for full-field profilometry and ...tomography. Despite huge technical advantages, there remain problems that the interference intensity undulations occurred depending on the interference phase. To avoid such problems, we propose a compensation technique of the interference signals using two frequency combs with slightly varied center wavelengths. The compensated full-field surface profile measurements of cover glass and onion skin were demonstrated experimentally to verify the advantages of the proposed method.
A wide-area sensor network whose sensor nodes are driven by supplied laser power is proposed in this paper. Each sensor node produces an optical signal by modulating a part of the supplied laser ...light and sends it back to a monitor. A developed sensor node was driven with an incident optical power of 1.7 mW, which is low enough to drive more than 100 sensor nodes placed along an optical fiber line. We also developed wireless/optical interface nodes that integrate the sensor network with wireless sensors and realize ubiquitous sensing.
In high-contrast imaging optical systems for direct observation of planets outside our solar system, adaptive optics with an accuracy of
λ
/10,000 root mean square is required to reduce the speckle ...noise down to 1 × 10
−10
level in addition to the nulling coronagraph which eliminate the diffracted light. We developed the speckle area nulling (SAN) method as a new dark-hole control algorithm which is capable of controlling speckle electric field in a wide area quickly, despite an extension of speckle nulling, and is robust not relying upon an optical model. We conducted a validation experiment for the SAN method with a monochromatic light and succeeded in reducing the intensity of areal speckles by 4.4 × 10
−2
.
In this paper, we show activities of CRYPTREC carried out by the security fundamentals laboratory between fiscal year 2011 and fiscal year 2015. We focus on “CRYPTREC Ciphers List” revised in fiscal ...year 2012 which has been issued as the “e-Government Recommended Ciphers List” since fiscal year 2002. We also note an outline of the present activities.
We generated parabolic pulses by using an optical pulse synthesizer and investigated their fiber transmission characteristics in detail. The generated pulses had a rms difference of less than 0.03 ...between the target pulse shapes and their shapes. We transmitted them through standard single-mode fibers and dispersion-shifted fibers to evaluate the influences of their dispersions and nonlinearities on the pulse shapes. We compared the experimental results with simulated results calculated by the split-step Fourier method. The two results were well matched with each other. In the high power regime, the pulses experienced the higher order nonlinearities and were strongly distorted.
A phase modulation of an optical frequency comb has been applied to measure a fine spectrum in the 1.5
μm wavelength range by the optical heterodyne-detection method. The measurement frequency range ...covered 25
GHz, which satisfies the frequency interval of the optical frequency comb, with a spectral resolution of 1
MHz.
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