2,703 research outputs found
Conformal Radiotherapy for Squamous Cell Carcinoma of Gallbladder: A Case Report
Background. Squamous cell carcinoma of the gallbladder is a rare disease with symptoms developing late in its course, so that it often presents as an aggressive tumor with a poor prognosis.
Case report. We describe a 58-year-old male with a 5-week history of hypodynamia. He was found to have squamous cell carcinoma of the gallbladder with liver invasion and lymph node metastases. He underwent treatment with 3-dimensional conformal radiation therapy (CRT). A follow-up computer tomography (CT) scan showed complete tumor remission 2 months after the completion of CRT. The patient survived for 14 months after the end of treatment and died of multiple liver metastases.
Conclusion. The efficacy of radiotherapy in this case is encouraging and suggests a potential role for such therapy in similar cases. The benefit in terms of survival warrants further study
Light Field Depth Estimation Based on Stitched-EPI
Depth estimation is one of the most essential problems for light field
applications. In EPI-based methods, the slope computation usually suffers low
accuracy due to the discretization error and low angular resolution. In
addition, recent methods work well in most regions but often struggle with
blurry edges over occluded regions and ambiguity over texture-less regions. To
address these challenging issues, we first propose the stitched-EPI and
half-stitched-EPI algorithms for non-occluded and occluded regions,
respectively. The algorithms improve slope computation by shifting and
concatenating lines in different EPIs but related to the same point in 3D
scene, while the half-stitched-EPI only uses non-occluded part of lines.
Combined with the joint photo-consistency cost proposed by us, the more
accurate and robust depth map can be obtained in both occluded and non-occluded
regions. Furthermore, to improve the depth estimation in texture-less regions,
we propose a depth propagation strategy that determines their depth from the
edge to interior, from accurate regions to coarse regions. Experimental and
ablation results demonstrate that the proposed method achieves accurate and
robust depth maps in all regions effectively.Comment: 15 page
Current-driven skyrmionium in a frustrated magnetic system
Magnetic skyrmionium can be used as a nanometer-scale non-volatile
information carrier, which shows no skyrmion Hall effect due to its special
structure carrying zero topological charge. Here, we report the static and
dynamic properties of an isolated nanoscale skyrmionium in a frustrated
magnetic monolayer, where the skyrmionium is stabilized by competing
interactions. The frustrated skyrmionium has a size of about nm, which can
be further reduced by tuning perpendicular magnetic anisotropy or magnetic
field. It is found that the nanoscale skyrmionium driven by the damping-like
spin-orbit torque shows directional motion with a favored Bloch-type helicity.
A small driving current or magnetic field can lead to the transformation of an
unstable N\'eel-type skyrmionium to a metastable Bloch-type skyrmionium. A
large driving current may result in the distortion and collapse of the
Bloch-type skyrmionium. Our results are useful for the understanding of
frustrated skyrmionium physics, which also provide guidelines for the design of
spintronic devices based on topological spin textures.Comment: 5 pages, 5 figure
The Galactic extinction and reddening from the South Galactic Cap U-band Sky Survey: u band galaxy number counts and color distribution
We study the integral Galactic extinction and reddening based on the galaxy
catalog of the South Galactic Cap U-band Sky Survey (SCUSS), where band
galaxy number counts and color distribution are used to derive the
Galactic extinction and reddening respectively. We compare these independent
statistical measurements with the reddening map of \citet{Schlegel1998}(SFD)
and find that both the extinction and reddening from the number counts and
color distribution are in good agreement with the SFD results at low extinction
regions ( mag). However, for high extinction regions
( mag), the SFD map overestimates the Galactic reddening
systematically, which can be approximated by a linear relation ]. By combing the results of galaxy number counts and
color distribution together, we find that the shape of the Galactic extinction
curve is in good agreement with the standard extinction law of
\cite{ODonnell1994}
No relationship between the distribution of mast cells and the survival of stage IIIB colon cancer patients
<p>Abstract</p> <p>Background</p> <p>Mast cells promote the progression of experimental tumors and might be a valuable therapeutic target. However, the relevant clinical evidence is still controversial. This study analyzed the relationship between the distribution of mast cells and the survival of patients with colon cancer to study whether mast cells contribute to tumor progression.</p> <p>Materials and methods</p> <p>Ninety-three cases of pathologically confirmed primary cancer tissues matched with adjacent normal mucosa, metastases of regional-draining lymph nodes and regional-draining lymph nodes without metastases were collected from stage IIIB colon carcinoma patients between January 1997 and July 2004 at the Cancer Center of Sun Yat-Sen University. Tryptase-positive mast cells were counted. The relationships of the distribution of mast cells with clinicopathologic parameters and 5-year survival were analyzed.</p> <p>Results</p> <p>Although the mast cell count in the mucosa adjacent to the primary colon cancer was significantly higher than that in the stroma of the primary colon cancer, no difference in mast cell counts was observed between the stroma in lymph node metastasis and the lymph tissue adjacent to the metastasis. Additionally, the mast cell count in the regional-draining lymph node without the invasion of cancer cells was significantly higher than that in the stroma of lymph node metastasis and adjacent lymph tissue. However, none of those mast cell counts was related to 5-year survival.</p> <p>Conclusion</p> <p>Although mast cell count varied with location, none of the mast cell counts was related to 5-year survival, suggesting that mast cells do not contribute to the progression of stage IIIB colon cancer.</p
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