4,700 research outputs found
Marketing: A Perspective
The issue of marketing on a limited budget is explored with the word-of-mouth being isolated as the most effective type. This type of strategy almost exclusively depends upon quality services
Optimal MRI sequences for 68Ga-PSMA-11 PET/MRI in evaluation of biochemically recurrent prostate cancer.
BackgroundPET/MRI can be used for the detection of disease in biochemical recurrence (BCR) patients imaged with 68Ga-PSMA-11 PET. This study was designed to determine the optimal MRI sequences to localize positive findings on 68Ga-PSMA-11 PET of patients with BCR after definitive therapy. Fifty-five consecutive prostate cancer patients with BCR imaged with 68Ga-PSMA-11 3.0T PET/MRI were retrospectively analyzed. Mean PSA was 7.9 ± 12.9 ng/ml, and mean PSA doubling time was 7.1 ± 6.6 months. Detection rates of anatomic correlates for prostate-specific membrane antigen (PSMA)-positive foci were evaluated on small field of view (FOV) T2, T1 post-contrast, and diffusion-weighted images. For prostate bed recurrences, the detection rate of dynamic contrast-enhanced (DCE) imaging for PSMA-positive foci was evaluated. Finally, the detection sensitivity for PSMA-avid foci on 3- and 8-min PET acquisitions was compared.ResultsPSMA-positive foci were detected in 89.1% (49/55) of patients evaluated. Small FOV T2 performed best for lymph nodes and detected correlates for all PSMA-avid lymph nodes. DCE imaging performed the best for suspected prostate bed recurrence, detecting correlates for 87.5% (14/16) of PSMA-positive prostate bed foci. The 8-min PET acquisition performed better than the 3-min acquisition for lymph nodes smaller than 1 cm, detecting 100% (57/57) of lymph nodes less than 1 cm, compared to 78.9% (45/57) for the 3-min acquisition.ConclusionPSMA PET/MRI performed well for the detection of sites of suspected recurrent disease in patients with BCR. Of the MRI sequences obtained for localization, small FOV T2 images detected the greatest proportion of PSMA-positive abdominopelvic lymph nodes and DCE imaging detected the greatest proportion of PSMA-positive prostate bed foci. The 8-min PET acquisition was superior to the 3 min acquisition for detection of small lymph nodes
Information Maximization Clustering via Multi-View Self-Labelling
Image clustering is a particularly challenging computer vision task, which
aims to generate annotations without human supervision. Recent advances focus
on the use of self-supervised learning strategies in image clustering, by first
learning valuable semantics and then clustering the image representations.
These multiple-phase algorithms, however, increase the computational time and
their final performance is reliant on the first stage. By extending the
self-supervised approach, we propose a novel single-phase clustering method
that simultaneously learns meaningful representations and assigns the
corresponding annotations. This is achieved by integrating a discrete
representation into the self-supervised paradigm through a classifier net.
Specifically, the proposed clustering objective employs mutual information, and
maximizes the dependency between the integrated discrete representation and a
discrete probability distribution. The discrete probability distribution is
derived though the self-supervised process by comparing the learnt latent
representation with a set of trainable prototypes. To enhance the learning
performance of the classifier, we jointly apply the mutual information across
multi-crop views. Our empirical results show that the proposed framework
outperforms state-of-the-art techniques with the average accuracy of 89.1% and
49.0%, respectively, on CIFAR-10 and CIFAR-100/20 datasets. Finally, the
proposed method also demonstrates attractive robustness to parameter settings,
making it ready to be applicable to other datasets
Periodontal Disease in Five and Six Year Old Children
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141478/1/jper0019.pd
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The Effects of Contingent Money Withdrawal on Three Response Classes of Verbal Behavior
This study attempted to reduce three response classes in the verbal behavior of a forty-three-year-old female graduate student. Consequences were placed on interruptions, illogical statements, and total time talking. Specifically, a response rate was taken on the three response classes, and contingent money withdrawal for exceeding defined limits was used as punishment. The treatment was generally effective in reducing interruptions, illogical statements, and total time talking to one half the baseline level, but the follow-up phase suggests that some form of maintainance procedure would be needed to maintain the rate at the lower level
Cell shape change and invagination of the cephalic furrow involves reorganization of F-actin
AbstractInvagination of epithelial sheets to form furrows is a fundamental morphogenetic movement and is found in a variety of developmental events including gastrulation and vertebrate neural tube formation. The cephalic furrow is a deep epithelial invagination that forms during Drosophila gastrulation. In the first phase of cephalic furrow formation, the initiator cells that will lead invagination undergo apicobasal shortening and apical constriction in the absence of epithelial invagination. In the second phase of cephalic furrow formation, the epithelium starts to invaginate, accompanied by both basal expansion and continued apicobasal shortening of the initiator cells. The cells adjacent to the initiator cells also adopt wedge shapes, but only after invagination is well underway. Myosin II does not appear to drive apical constriction in cephalic furrow formation. However, cortical F-actin is increased in the apices of the initiator cells and in invaginating cells during both phases of cephalic furrow formation. These findings suggest that a novel mechanism for epithelial invagination is involved in cephalic furrow formation
Gyrotronâbackwardâwaveâoscillator experiments utilizing a high current, high voltage, microsecond electron accelerator
We report the first gyrotronâbackwardâwaveâoscillator experiments to produce high power (tube power of âŒ1â8 MW), longâpulse (0.3â1.2 ÎŒs) microwaves at high currents (0.1â2 kA) and high voltages (650â750 kV). Experiments were performed in the TE11 fundamental backwardâwave mode, with efficiencies of âŒ1%â2%. Mode competition was observed which is believed to originate from the TE21 absolute instability.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70862/2/JAPIAU-72-4-1221-1.pd
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