Brent K. Stewart

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A recurring source of contention between clinicians and radiologists continues to be examination appropriateness when imaging pregnant patients. With the multitude of references on potential radiation risks to the fetus, radiologists tend to be cautious and hesitant about exposing the fetus to radiation. This tendency is often interpreted by referring(More)
OBJECTIVE A data-mining program extracts computed radiography (CR) sensitivity-number (S-number) information from the PACS at our institution on a monthly basis as an ongoing quality assurance (QA) improvement project. These data are compared with the previous month's data and departmental S-number goals. The results are presented at monthly QA meetings.(More)
PACS (Picture Archiving and Communication Systems) database design requires careful understanding of the data and processing needs of radiologists, referring physicians, radiology staff, administrators, and researchers. Due to access requirements, the physical implementation for the management of small text data sets differs from the implementation strategy(More)
  • B K Stewart
  • Computer methods and programs in biomedicine
  • 1989
This study presents preliminary results of single kVp dual-energy computed radiography using laser stimulable luminescent phosphor image plate detectors. The single kVp technique makes use of four of these plates in a single cassette, each plate acting as an X-ray filter to the next so that the energy separation required for the dual-energy basis(More)
Over the past five years the University of Washington has created a clinical data repository. This repository combines in a distributed relational database information from multiple departmental databases (MIND). MINDscape provides a platform independent, web browser view of the MIND dataset that can easily be linked to other information resources on the(More)
The authors have examined the utility of using the rate of change of the human chorionic gonadotropin (hCG) level and progesterone concentration to distinguish ectopic from normal intrauterine pregnancies. Patients suspicious for ectopic pregnancy had three outcomes: normal intrauterine gestation (NIUG), ectopic pregnancy (ECT), and inevitable abortion(More)
Implementation of a Picture Archiving and Communication System (PACS) is a system integration task and requires the knowledge of multidisciplinary fields. This paper reviews current PACS development with emphasis on radiological images. The following topics are covered: methods of image acquisition, image compression, storage, display, communication, and(More)
This paper describes the implementation of a large-scale picture archiving and communication system (PACS) in a clinical environment. The system consists of a PACS infrastructure, composed of a PACS controller, a database management system, communication networks, and optical disk archive. It connects to three MR units, four CT scanners, three computed(More)
OBJECTIVE Our objective was to develop a better understanding of the complex interrelationship between image noise, reconstruction slice thickness, and patient radiation dose on a 64-MDCT scanner that uses automated tube current modulation. MATERIALS AND METHODS We reviewed physics theory and performed phantom dose measurements on a 64-MDCT scanner while(More)
The authors have investigated the application of the NASA Advanced Communications Technology Satellite (ACTS) to teleradiology and telemedicine using the Jet Propulsion Laboratory (JPL)-developed ACTS Mobile Terminal (AMT) uplink. In this experiment, bidirectional 128, 256, and 384 kbps satellite links were established between the ACTS/AMT, the ACTS in(More)