Abstract：
OBJECTIVES:The filtered backprojection is not able to cope with metal-induced inconsistencies in the Radon space which leads to artifacts in reconstructed CT images. A new algorithm is presented that reduces the drawbacks of existing artifact reduction strategies. METHODS:Inconsistent projection data are bridged by directed interpolation. These projections are reconstructed using a weighted maximum likelihood algorithm (lambda-MLEM). The correlation coefficient between images of a torso phantom marked with steel markers reconstructed with lambda-MLEM and images of the same torso slice without markers quantifies the quality achieved. For clinical data, entropy maximization is presented to obtain appropriate weightings. RESULTS:Different interpolation strategies have been applied. The quality of reconstruction sensitively depends on the complexity of interpolation. A directional interpolation gives best results. However, the quality of the images can be further improved by an appropriate weighing within lambda-MLEM. This has been demonstrated with data from a torso phantom, a jaw with amalgam fillings and a hip prosthesis. CONCLUSIONS:lambda-MLEM image reconstruction using data from directional Radon space interpolation is a new approach for metal artifact reduction. The weighting in this statistical approach is used to reduce the influence of residual inconsistencies in a way that optimal artifact suppression is obtained by optimizing a compromise between residual inconsistencies and void data. The image quality is superior compared with other artifact reduction strategies.
journal_name
Methods Inf Medjournal_title
Methods of information in medicineauthors
Buzug T,Oehler Mdoi
10.1160/ME9041subject
Has Abstractpub_date
2007-01-01 00:00:00pages
261-9issue
3eissn
0026-1270issn
2511-705Xpii
07030009journal_volume
46pub_type
杂志文章abstract：OBJECTIVES:Personal digital assistants (PDAs) are in widespread use by resident physicians in many countries, reaching as high as 95% in some reports. Uses are varied and include clinical decision support and support of evidence-based practice. Utilization by resident doctors in Japan has not been characterized. This s...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：10.3414/ME0607
更新日期：2009-01-01 00:00:00
abstract：OBJECTIVE:To intensify the collaboration between WHO, the World Health Organization, and IMIA, the International Medical Informatics Association. METHODS:Identifying key areas of collaboration and publishing a joint communiqué during Medinfo 2007 in Brisbane, Australia. RESULTS AND CONCLUSIONS:WHO and IMIA have ident...
journal_title：Methods of information in medicine
pub_type： 社论
doi：10.1160/me5006
更新日期：2007-01-01 00:00:00
abstract：:The graduates and students of the School of Health Information Science (HIS) at the University of Victoria (UVic) have pioneered the Canadian sphere in health informatics since 1982. After six years of growth this co-operative education program has matured and establishment of a research base and graduate school has b...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1989-11-01 00:00:00
abstract：OBJECTIVES:To assess the impact of a CPOE system on medication-related communication of nurses and physicians. METHODS:In six internal medicine wards of an academic medical center, two questionnaires were used to evaluate nurses' attitudes toward the impact of a paper-based medication system and then a CPOE system on ...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：10.3414/ME0572
更新日期：2009-01-01 00:00:00
abstract：:Natural language understanding systems have to exploit various kinds of knowledge in order to represent the meaning behind texts. Getting this knowledge in place is often such a huge enterprise that it is tempting to look for systems that can discover such knowledge automatically. We describe how the distinction betwe...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1998-11-01 00:00:00
abstract：OBJECTIVES:In this work, a cellular automaton software package for simulating different infectious diseases, storing the simulation results in a data warehouse system and analyzing the obtained results to generate prediction models as well as contingency plans, is proposed. The Brisbane H3N2 flu virus, which has been s...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：10.3414/ME09-02-0025
更新日期：2010-01-01 00:00:00
abstract：OBJECTIVES:Lifestyle has a major influence on the development and progression of atherosclerosis. Our motto for healthy habits is "give up one, reduce two, and increase three". The one thing that is to be given up is smoking. The two things that are to be reduced are intake of food and alcohol. The three things that ar...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：2005-01-01 00:00:00
abstract：OBJECTIVES:The analysis of energetic ventricular variable changes during artificial ventilation, obtained by numerical simulation was done. Twenty-one sets of hemodynamic parameters for eight cardiosurgical patients were used to estimate left and right stroke work. The data were collected for three methods of ventilati...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：2005-01-01 00:00:00
abstract：OBJECTIVES:Rule induction is one of the major methods of machine learning. Rule-based models can be easily read and interpreted by humans, that makes them particularly useful in survival studies as they can help clinicians to better understand analysed data and make informed decisions about patient treatment. Although ...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：10.3414/ME13-01-0046
更新日期：2014-01-01 00:00:00
abstract：OBJECTIVES:To investigate the nonlinear characteristics of visual evoked potentials (VEPs), and their correlation with the visual responses on parvocellular and magnocellular pathways. First and second-order kernels of the VEPs elicited by several checkerboard patterns were estimated, and their relations to the visual ...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：2007-01-01 00:00:00
abstract：:We present an algorithm for reconstructing the bifurcation structure of a dynamical system from time series. The method consists in finding a parameterized predictor function whose bifurcation structure is similar to that of the given system. Nonlinear autoregressive (NAR) models with polynomial terms are employed as ...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：2000-06-01 00:00:00
abstract：OBJECTIVES:Both open- and closed-loop models of beat-to-beat cardiovascular control have been suggested. We tested whether the modelling yields different results with real data while assessing cardiopulmonary and baroreflex gains. METHODS:Two autoregressive models are described to resolve causal relationships between ...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：2004-01-01 00:00:00
abstract：:Psych Topix is a knowledge-based program which guides the clinician from an on-line clinical report to a search of the psychiatric literature or of other relevant databases. It provides this guidance by using an outline of key topics in a clinical field to provide "concept-based" links. Each topic is augmented with an...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1992-09-01 00:00:00
abstract：OBJECTIVE:The objective of this study is to develop a solution to preserve security and privacy in a healthcare environment where health-sensitive information will be accessed by many parties and stored in various distributed databases. The solution should maintain anonymous medical records and it should be able to lin...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：10.3414/me9116
更新日期：2008-01-01 00:00:00
abstract：OBJECTIVE:To present a geometric ruler to determine predictive values of binary diagnostic test results from prevalence, sensitivity and specificity without calculation. METHODS:On logarithmic scale the relationships between pre-/post-test odds and the likelihood ratio as well as sensitivity, specificity and the likel...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：10.3414/ME14-01-0091
更新日期：2015-01-01 00:00:00
abstract：:A new method is presented, different from usual methods, for the discussion of the results of computer ECG measurement programs, based on a new graphical evaluation method. The proposed "scatter-graphs" both highlight the main program results and facilitate the comparison between various wave-recognition algorithms. T...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1990-09-01 00:00:00
abstract：BACKGROUND:Questions like 'How is your health? How are you feeling? How have you been?' now can be answered in a different way due to innovative health self-quantification apps and devices. These apps and devices generate data that enable individuals to be informed and more responsible about their own health. OBJECTIV...
journal_title：Methods of information in medicine
pub_type： 杂志文章,评审
doi：10.3414/ME15-02-0007
更新日期：2017-01-09 00:00:00
abstract：:Often in drug trials only the objective, or the subjective responses of the subjects are investigated, depending on the kind of drug. It is, however, desirable to check both the objective and the subjective responses in every drug trial. The investigation of the objective symptoms which is especially necessary in psyc...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1963-01-01 00:00:00
abstract：OBJECTIVE:Pulmonary disorders are frequently characterized by the presence of adventitious sounds added to the breathing or base lung sound (BLS). The aim of this work was to assess the features of BLS in extrinsic allergic alveolitis (EAA) patients in comparison to healthy subjects, applying linear and nonlinear analy...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：10.3414/ME12-01-0037
更新日期：2013-01-01 00:00:00
abstract：OBJECTIVE:The aim of this paper is twofold. First, we describe two important dimensions of patient care information systems (PCIS) evaluation: the domain of evaluation and the different phases of the PCIS implementation. Second, we claim that, though Randomized Controlled Trials (RCTs) are often still seen as the stand...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：2003-01-01 00:00:00
abstract：:The use of computers in the field of medical education is common. Our purpose is to present a Computer-Assisted Instruction system which has been developed over ten years at the University of Compiègne and the University of Rennes Medical School. This system can be used to help the student to solve clinical cases by a...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1994-10-01 00:00:00
abstract：:The illustration of a patient's history by a graphical primitive is discussed. Illustration technology is presented which simultaneously represents quantitative examination findings (e.g., laboratory values) and qualitative findings (e.g., from function diagnostics) by a single geometrical figure. Depending on the med...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1995-06-01 00:00:00
abstract：:Rapid development of community health information networks raises the issue of semantic interoperability between distributed and heterogeneous systems. Indeed, operational health information systems originate from heterogeneous teams of independent developers and have to cooperate in order to exchange data and service...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1998-11-01 00:00:00
abstract：OBJECTIVES:This paper describes a methodology for the monitoring of the fetal cardiac health status during pregnancy, through the effective and non-invasive monitoring of the abdominal ECG signals (abdECG) of the mother. METHODS:For this purpose, a three-stage methodology has been developed. In the first stage, the fe...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：10.3414/ME09-01-0041
更新日期：2010-01-01 00:00:00
abstract：OBJECTIVES:This study aims to demonstrate the usability of discourse analyses as a means of evaluating medical informatics systems by examining one particular computer-based data-to-text system for delivering neonatal health care information. METHODS:Six textual summaries of clinical information, three produced by hum...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：10.3414/ME0613
更新日期：2010-01-01 00:00:00
abstract：:To examine inter-observer variation in the monitoring of patients with chronic disease, four nephrologists independently assessed 62 patients on maintenance hemodialysis. Deviation from normal was determined for adequacy of dialysis, protein intake, and metabolic state. The kappa-index, which allows to adjust for chan...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1990-03-01 00:00:00
abstract：:Surgical fluid replacement is a critical issue in medicine as the fluid volume excess or deficit can both complicate the patient's condition. Currently, the administration of fluid volume is carried out primarily based on the experience and expertise of the anaesthetist as there is no analytical method available to es...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：2001-03-01 00:00:00
abstract：:This paper presents a tutorial introduction to the handling of uncertainty and decision-making in medical reasoning systems. It focuses on the central role of uncertainty in all of medicine and identifies the major themes that arise in research papers. It then reviews simple Bayesian formulations of the problem and pu...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1995-03-01 00:00:00
abstract：:This article is part of a For-Discussion-Section of Methods of Information in Medicine about the paper "Computational Electrocardiography: Revisiting Holter ECG Monitoring" written by Thomas M. Deserno and Nikolaus Marx. It is introduced by an editorial. This article contains the combined commentaries invited to indep...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：10.3414/ME15-15-0009
更新日期：2016-08-05 00:00:00
abstract：:A rough-sets approach was applied to a data set consisting of animal study results and other compound characteristics to generate local and global (certain/possible) sets of rules for prediction of developmental toxicity in human subjects. A modified version of the rough-sets approach is proposed to allow the construc...
journal_title：Methods of information in medicine
pub_type： 杂志文章
doi：
更新日期：1993-02-01 00:00:00
