21,775 research outputs found
Thoracic Disease Identification and Localization with Limited Supervision
Accurate identification and localization of abnormalities from radiology
images play an integral part in clinical diagnosis and treatment planning.
Building a highly accurate prediction model for these tasks usually requires a
large number of images manually annotated with labels and finding sites of
abnormalities. In reality, however, such annotated data are expensive to
acquire, especially the ones with location annotations. We need methods that
can work well with only a small amount of location annotations. To address this
challenge, we present a unified approach that simultaneously performs disease
identification and localization through the same underlying model for all
images. We demonstrate that our approach can effectively leverage both class
information as well as limited location annotation, and significantly
outperforms the comparative reference baseline in both classification and
localization tasks.Comment: Conference on Computer Vision and Pattern Recognition 2018 (CVPR
2018). V1: CVPR submission; V2: +supplementary; V3: CVPR camera-ready; V4:
correction, update reference baseline results according to their latest post;
V5: minor correction; V6: Identification results using NIH data splits and
various image model
Millimeter line observations toward four local galaxies
We present results of millimeter line observations toward four local gas-rich
galaxies (NGC 3079, NGC 4258, NGC 6240 and VII Zw 31) with the IRAM 30 meter
millimeter telescope. More than 33 lines in these four sources were detected,
including normal dense gas tracers (HCN 1-0, HCO 1-0, and CH 1-0, etc)
and their isotopic species. HCN (1-0) and HCO (1-0) are
detected for the first time in NGC 4258. Optical depths of HCN 1-0 and
HCO 1-0 were estimated with detected isotopic lines in NGC 4258, which
were 4.1 and 2.6, respectively. HCN , which requires high volume
density and high temperature to excite, was detected in NGC 6240. High ratios
of HCO/HCN in NGC 4258 and NGC 6240 imply that this ratio might not be a
perfect diagnostic tool between AGN and starburst environments, due to
contamination/combination of both processes. The low HCN/HCN line ratios
with less than 0.15 in NGC 4258, NGC 6240 and the non-detection of HCN line
in NGC 3079 and VII Zw 31 indicates that these four galaxies are HCN-poor
galaxies. The variation of fractional abundance of CN in different types of
galaxies is large.Comment: 15pages, 13 figures; accepted for publication in MNRA
- β¦