Electrogasdynamic power generation; an evaluation of work performed by Fourdine Systems, Incorporated under OCR Contract no. 14-01-0001-495 for Office of Coal Research, Dept. of the Interior,

Cover title: Separate evaluations of electrogasdynamic (EGD) power generation.

Investigation of standards, performance characteristics, and evaluation criteria for thermoplastic piping in residential plumbing systems /

"Sponsored by Office of Policy Development and Research, Department of Housing and Urban Development."

Methodologies for the evaluation and improvement of emergency medical services systems : final report /

"Prepared for: U.S. ... National Highway Traffic Safety Administration.

Laboratory evaluation of nondestructive methods to measure moisture in built-up roofing systems /

Item 241-A

The evaluation and application of chemically regenerative atmospheric control systems.

" Report ; no. TDR-269 (4560-50)-2)."

An evaluation of IDOT's current underdrain systems : final report /

"December 1995."

The Illinois system of systems : a critical evaluation of higher education organization : a report of the Select Committee on State Government Organization.

Mode of access: Internet.

Educational systems of the world; interpretations for use in evaluation of foreign credentials. -

Bibliography: p. [753]-838.

A comparative evaluation of alternative systems for the provision of effective access to periodical literature : a report to the National Commission on Libraries and Information Science /

Mode of access: Internet.

Evaluation of occupant protection devices and restraint systems : /

Mode of access: Internet.

The Effect of emergency medical systems on prehospital cardiovascular care : an evaluation of studies and an inventory of data bases.

"DOT HS805 204."

An evaluation of data systems for UI, CETA and other labor market programs /

Photocopy of: 1979 ed.

The national evaluation of the Pilot Cities Program : a team approach to improving local criminal justice systems /

Issued November 1975.

Ecological systems approaches to aerobiology, II : development, demonstration and evaluation of models : proceedings of workshop/conference II, National Center for Atmospheric Research, Boulder, Colorado, 12-14 July 1972 /

At head of title: International Biological Program, United States National Committee, Aerobiology Program.

Geometric distortion in clinical MRI systems - Part I: evaluation using a 3D phantom

Recently, a 3D phantom that can provide a comprehensive and accurate measurement of the geometric distortion in MRI has been developed. Using this phantom, a full assessment of the geometric distortion in a number of clinical MRI systems (GE and Siemens) has been carried out and detailed results are presented in this paper. As expected, the main source of geometric distortion in modern superconducting MRI systems arises from the gradient field nonlinearity. Significantly large distortions with maximum absolute geometric errors ranged between 10 and 25 mm within a volume of 240 x 240 x 240 mm(3) were observed when imaging with the new generation of gradient systems that employs shorter coils. By comparison, the geometric distortion was much less in the older-generation gradient systems. With the vendor's correction method, the geometric distortion measured was significantly reduced but only within the plane in which these 2D correction methods were applied. Distortion along the axis normal to the plane was, as expected, virtually unchanged. Two-dimensional correction methods are a convenient approach and in principle they are the only methods that can be applied to correct geometric distortion in a single slice or in multiple noncontiguous slices. However, these methods only provide an incomplete solution to the problem and their value can be significantly reduced if the distortion along the normal of the correction plane is not small. (C) 2004 Elsevier Inc. All rights reserved.