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L Coffey

Publications and source records attributed to L Coffey.

At least 19 recordsLinked to original sources
PubMed2006

Persistence of strong electron coupling to a narrow boson spectrum in overdoped Bi2Sr2CaCu2O(8+delta) tunneling data.

A d-wave, Eliashberg analysis of break-junction and STM tunneling spectra on Bi2Sr2CaCu2O(8+delta) (Bi2212) reveals that the spectral dip feature is directly linked to strong electronic coupling to a narrow boson spectrum, evidenced by a large peak in alpha2F(omega). The tunneling dip feature remains robust in the overdoped regime of Bi2212 with bulk T(c) values of 56 K-62 K. This is contrary to recent optical conductivity measurements of the self-energy that suggest the narrow boson spectrum disappears in overdoped Bi2212 and therefore cannot be essential for the pairing mechanism. The discrepancy is resolved by considering the way each technique probes the electron self-energy, in particular, the unique sensitivity of tunneling to the off-diagonal or pairing part of the self-energy.

Journal Article↗
PubMed2005

Can the radiologist accurately predict the adequacy of sampling when performing ultrasound-guided core biopsy of BI-RADS category 4 and 5 lesions detected on screening mammography?

AIM: To investigate in mammography screening the correlation between the confidence level of the radiologist, in sampling BI-RADS assessment category 4 and 5 lesions using a single ultrasound-guided 14-gauge needle core biopsy, and the final histological diagnosis. METHODS: In a prospective study, 389 consecutive ultrasound-guided 14-gauge needle core biopsies were performed on 131 BI-RADS assessment category 4 and 5 breast lesions in 126 women. On average, 3 passes were made through each lesion; for each pass, the radiologist rated confidence in adequacy of sampling at <50%, 50% to 90% or >90%. This was compared with the final histological diagnosis. RESULTS: The radiologist was >90% confident in 293 biopsies; diagnostic results were confirmed at histology in 283 (97%). In 70 biopsies the radiologist was 50% to 90% confident; diagnostic results were confirmed in 60 (86%). Of 26 samples where confidence was <50%, 13 were diagnostic (50%) (p<0.0001). CONCLUSION: If, at the time of ultrasound-guided needle core biopsy of BI-RADS assessment category 4 and 5 breast lesions, the radiologist is >90% confident that the lesion has been adequately sampled, a single pass is usually sufficient for diagnosis.

Attitude of Health Personnel↗
PubMed1999

Nightly home hemodialysis: improvement in nutrition and quality of life.

In September, 1997, we began a Nightly Home Hemodialysis Program modeled after a program in Toronto, Canada. We have assessed nutritional parameters and quality of life indicators before initiation of the program, and at 3, 6, 12, and 18 months. Data suggest that patients have improved overall quality of life as measured by the CHOICE Health Experience Questionnaire. Three-day dietary recalls at 0, 3, 6, 12, and 18 months also show patients are eating healthy and maintaining adequate kilocalorie and protein intakes, as well as maintaining adequate dry weight and protein stores.

Adult↗