8 research outputs found
Automatic determination of Greulich and Pyle bone age in healthy Dutch children
Background: Bone age (BA) assessment is a routine procedure in paediatric radiology, for which the Greulich and Pyle (GP) atlas is mostly used. There is rater variability, but the advent of automatic BA determination eliminates this. Objective: To validate the BoneXpert method for automatic determination of skeletal maturity of healthy children against manual GP BA ratings. Materials and methods: Two observers determined GP BA with knowledge of the chronological age (CA). A total of 226 boys with a BA of 3-17 years and 179 girls with a BA of 3-15 years were included in the study. BoneXpert's estimate of GP BA was calibrated to agree on average with the manual ratings based on several studies, including the present study. Results: Seven subjects showed a deviation between manual and automatic BA in excess of 1.9 years. They were re-rated blindly by two raters. After correcting these seven ratings, the root mean square error between manual and automatic rating in the 405 subjects was 0.71 years (range 0.66-0.76 years, 95% CI). BoneXpert's GP BA is on average 0.28 and 0.20 years behind the CA for boys and girls, respectively. Conclusion: BoneXpert is a robust method for automatic determination of BA
Skeletal development of the hand and wrist: digital bone age companion—a suitable alternative to the Greulich and Pyle atlas for bone age assessment?
Radiographic analysis of epiphyseal fusion at knee joint to assess likelihood of having attained 18 years of age
The CMS Tracker operation and performance at the Magnet Test and Cosmic Challenge
During summer 2006 a fraction of the CMS silicon strip tracker was operated in a comprehensive slice test called the Magnet Test and Cosmic Challenge (MTCC). At the MTCC, cosmic rays detected in the muon chambers were used to trigger the readout of all CMS sub-detectors in the general data acquisition system and in the presence of the 4 T magnetic field produced by the CMS superconducting solenoid. This document describes the operation of the Tracker hardware and software prior, during and after data taking. The performance of the detector as resulting from the MTCC data analysis is also presented. © 2008 IOP Publishing Ltd and SISSA.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Stand-alone cosmic muon reconstruction before installation of the CMS silicon strip tracker
The subsystems of the CMS silicon strip tracker were integrated and
commissioned at the Tracker Integration Facility (TIF) in the period from
November 2006 to July 2007. As part of the commissioning, large samples of
cosmic ray data were recorded under various running conditions in the absence
of a magnetic field. Cosmic rays detected by scintillation counters were used
to trigger the readout of up to 15% of the final silicon strip detector, and
over 4.7 million events were recorded. This document describes the cosmic track
reconstruction and presents results on the performance of track and hit
reconstruction as from dedicated analyses.Comment: Added missing LaTex command / no change in contents w.r.t. v