7,973 research outputs found
Effects of maternal conditions on early life history traits of black porgy Acanthopagrus schlegeli.
No full textEffects of salinity on egg and early larval characteristics of the black porgy Acanthopagrus schlegeli.
No full textCopepod diversity and composition as indicators of intrusion of the Kuroshio Branch Current into the northern Taiwan Strait in spring 2000.
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Application of CT in Diagnosing Carcinoma of the Maxillary Sinuses : PART 2: An Experimental Study of Pitfalls Encountered when Diagnosing Carcinoma of the Maxillary Sinuses with CT
Full text link1982-03A phantom simulating the transverse section of the maxillary sinuses was constructed for experimentation with various CT scanners to study the following: (1) the occasional inability to image the very thin posterior-lateral walls which have no real bone defects, and (2) to verify whether or not the bony walls surrounding the maxillary sinuses are actually as thick as they appear on CT. The phantom was made of an acrylic cylinder containing three cavities simulating the maxillary sinuses and the nasal cavity and filled with water. The walls, made of thin aluminum and acrylic plates and placed between water and air, disappeared in some CT images. The thickness of the walls calculated from CT values was greater than the true thickness imaged by each CT scanner. The author stresses that in CT images, either experimentally or clinically, thin bony walls placed between water and air or fat tend to disappear, and that bony walls tend to appear thicker than their true thickenss.departmental bulletin pape
Use of CT Colonography in the English Bowel Cancer Screening Programme
Full text linkObjective: To examine use of CT colonography (CTC) in the English Bowel Cancer Screening Programme (BCSP) and investigate detection rates.
Design: Retrospective analysis of routinely coded BCSP
data. Guaiac faecal occult blood test (gFOBt)-positive
screenees undergoing CTC from June 2006 to July 2012
as their first-line colonic investigation were included.
Abnormalities found at CTC, subsequent polyp, adenoma
and cancer detection and positive predictive value (PPV)
were calculated. Detection rates were compared with
those observed in gFOBt-positive screenees investigated
by colonoscopy. Multilevel logistic regression was used
to examine factors associated with variable detection.
Results: 2731 screenees underwent CTC. Colorectal
cancer (CRC) or polyps were suspected in 1027
individuals (37.6%; 95% CI 33.8% to 41.4%); 911 of
these underwent confirmatory testing. 124 screenees
had CRC (4.5%) and 533 had polyps (19.5%), 468
adenomatous (17.1%). Overall detection was 24.1%
(95% CI 21.5% to 26.6%) for CRC or polyps and
21.7% (95% CI 19.2% to 24.1%) for CRC or adenoma.
Advanced neoplasia was detected in 504 screenees
(18.5%; 95% CI 16.1% to 20.8%). PPV for CRC or
polyp was 72.1% (95% CI 66.6% to 77.6%). By
comparison, 9.0% of 72 817 screenees undergoing
colonoscopy had cancer and 50.6% had polyps;
advanced neoplasia was detected in 32.7%. CTC
detection rates and PPV were higher at centres with
experienced radiologists (>1000 examinations) and at
high-volume centres (>175 cases/radiologist/annum).
Centres using three-dimensional interpretation detected
more neoplasia.
Conclusions: In the BCSP, detection rates after positive
gFOBt are lower for CTC than colonoscopy, although
populations undergoing the two tests are different.
Centres with more experienced radiologists have higher
detection and accuracy. Rigorous quality assurance of
BCSP radiology is needed
Genetic and epidemiological analysis of influenza virus endemics in Taiwan during 2003-2006.
No full textEvolution of Left Atrial Systolic and Diastolic Functions in Different Stages of Hypertension: Distinct Effects of Blood Pressure Control.
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