Digital radiology equipment acquisition and installation procedures: a team approach at Mayo Clinic, Rochester, MN.

Digital imaging system integration is a complex process. A project team and a defined process for system planning, evaluation, and implementation can improve the chance for success. In this presentation, our project team relates their experiences.

Lifetime redistribution under the Social Security program: a literature synopsis.

This article provides a brief overview of the more important studies of lifetime redistribution under the Old-Age and Survivors Insurance (OASI) and Disability Insurance (DI) programs. Studies are categorized into two types, those that focus on redistribution across successive cohorts of workers or typical members of those cohorts and those that focus on the distribution of results across characteristics of interest within particular cohorts of workers. A list of related studies is provided at the end of the article for those interested in additional reading.

Historical redistribution under the Social Security Disability Insurance Program.

This study uses Social Security administrative data on historical taxes and benefits by year, age, gender, and race for an ex post analysis of redistribution under the Disability Insurance (DI) program. The relationship between the taxes paid and benefits received to date under the program is described for successive cohorts as a whole and for specific race and gender groups both within cohorts and across time.

CT reconstruction algorithm selection in the evaluation of solitary pulmonary nodules.

OBJECTIVE: We have observed a significant CT artifact in the evaluation of lung nodules that occurred with the use of high-spatial-frequency reconstruction algorithms. We have seen this lead to a false-positive diagnosis of calcification in a small uncalcified lung nodule. Because of the seriousness of misinterpretation of benign calcification in an uncalcified nodule, we reviewed the various effects of several reconstruction algorithms on different scanners. MATERIALS AND METHODS: Using high-spatial-frequency, smoothing, and intermediate reconstruction algorithms, we studied standardized cylinders in a CT reference phantom and lung nodules in eight patients. Algorithms on four CT scanners were analyzed. RESULTS: We found peripheral edge enhancement artifact on some CT images of phantom cylinders and uncalcified lung nodules. The images with edge enhancement artifact were obtained from two scanners with the use of high-spatial-frequency algorithms (Picker 1200 SX and GE HiSpeed Advantage). CONCLUSION: Use of high-spatial-frequency reconstruction algorithms for the analysis of lung nodules with thin-section CT may lead to an erroneous diagnosis of calcification.

A guide to Social Security money's worth issues.

This article discusses some of the major issues associated with the question of whether workers receive their money's worth from the Social Security program. An effort is made to keep the discussion as nontechnical as possible, with explanations provided for many of the technical terms and concepts found in the money's worth literature. Major assumptions, key analytical methods, and money's worth measures used in the literature are also discussed. Finally, the key findings of money's worth studies are summarized, with some cautions concerning the limitations and appropriate usage of money's worth analyses.

Social security and private saving: theory and historical evidence.

This article is a nontechnical presentation of the debate that has gone on during the past decade over whether the U.S. social security system has depressed private saving in the economy. The heart of the article is an assessment of economist Martin Feldstein's original evidence, presentation of the alternative evidence that concluded that currently available historical data do not support the proposition that social security reduces private saving, and an evaluation of the contradictory evidence presented by Feldstein in response to the alternative evidence. The article concludes that, although the total body of evidence is inconclusive, the historical evidence fails to support the hypothesis that social security has reduced private saving. The Office of Research, Statistics, and International Policy, as part of its ongoing research mission, investigates the interrelationship between social security and the economy. This article presents an examination of one of several aspects of this relationship relevant to public policy considerations and is intended to make previously published technical papers available to a broader audience.