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Biomedical subjects

L H Winter

Publications and source records attributed to L H Winter.

7 recordsLinked to original sources
PubMed1995

A ROC study of AMBER and conventional chest imaging in the detection of simulated interstitial lung disease.

PURPOSE: The aim of this study was to compare the detection of simulated interstitial lung disease with Advanced Multiple Beam Equalization Radiography (AMBER) and conventional wide latitude screen-film radiography. MATERIALS AND METHODS: Interstitial disease of varying severity was simulated with overlays on an anthropomorphic chest phantom. A total of 60 images per modality was used in a Receiver Operating Characteristic (ROC) study. RESULTS: AMBER performed significantly better than conventional radiography for all readers (P < 0.02). The difference was even more significant for the radiologist readers (P = 0.001). In each case the difference in ROC areas was between 5% and 9%. CONCLUSION: AMBER is superior to conventional wide latitude screen-film imaging in detecting the subtle patterns used to simulate interstitial lung disease.

Humans↗
PubMed1993

A pseudo-aneurysm of the internal mammary artery: a very rare complication of subclavian vein puncture.

An extensive number of complications after insertion of a subclavian catheter is described in the literature. In this case report a patient with a pseudo-aneurysm of the internal mammary artery after insertion of a subclavian catheter is described. If one finds a shadow on the X-ray of the chest after insertion of a subclavian catheter, the possibility of a pseudo-aneurysm should be considered first.

Adult↗
PubMed1993

Hepatocholedochal cysts. A rare cause of obstructive jaundice.

The case history is described of a 21-year-old woman who, after analysis because of jaundice and pain in the upper abdomen, was diagnosed as having hepatocholedochal cysts Type IV-A. Surgery was performed. In connection with this case history the literature on hepatocholedochal cysts is reviewed.

Adult↗
PubMed1990

Free-response methodology: alternate analysis and a new observer-performance experiment.

The authors review the recently introduced method for analyzing free-response receiver operating characteristic (FROC) observer-performance experiments. These experiments allow multiple abnormalities and observer responses per image and require correct localization for true-positive events. A fundamental plot, the alternative FROC (AFROC), is emphasized, the area under which is a natural index of performance for measuring FROC observer performance. The authors show that it is possible to analyze free-response data in more general ways. The first method, AFROC analysis, involves scoring FROC images in a different way. The second method involves a new observer-performance experiment, the free-response forced error (FFE) experiment. FROC and AFROC analysis was applied to several FROC data sets, and simultaneous FROC-AFROC-FFE experiments were performed with several radiologist observers to test the three methods. The methods were found to be in good agreement with one another.

Humans↗
PubMedDate not supplied

Diagnostic evaluation of a PACS subsystem using mammographs. An ROC analysis.

The objective of this study was to compare the diagnostic accuracy of digitized mammographs with the original conventional films. The criterion was the detectability of small calcifications in the female breast. Four skilled radiologists read 100 films, conventional as well as digitized. The results were analysed using ROC methodology, and showed much lower diagnostic accuracy of digitized images (average AUC 0.67) compared to conventional films (average AUC 0.89). One of the problems with digitized images was to recognize and ignore film artifacts, which were hard to discriminate from small calcifications. The experiment was prepared, carried out and analysed with the FEASIBLE software package.

Breast Neoplasms↗
PubMedDate not supplied

FEASIBLE (II): Its use in an actual PACS evaluation study.

The software package FEASIBLE is a tool for carrying out observer performance studies. The structure, background and possibilities of the program are described in paper I of this series. Observer performance studies can be used to evaluate the diagnostic quality of Picture Archiving and Communication System (PACS) components. This paper summarizes the general features of such an evaluation. It states the specific characteristics of a diagnostic evaluation of a prototype PACS. The examples of the use of FEASIBLE presented here originate from the study that has recently been conducted within the Dutch PACS project, a cooperation between the BAZIS project IMAGIS (IMAGe Information System), the Utrecht University Hospital and Philips Medical Systems. Furthermore, this paper demonstrates how FEASIBLE is used to carry out an observer performance study. It is shown step-by-step how experiments on the evaluation of PACS components can be executed in an easy, reliable and quick way, by means of the FEASIBLE package.

Evaluation Studies as Topic↗