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Dive into the research topics where Edward V. Staab is active.

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Featured researches published by Edward V. Staab.


IEEE Transactions on Medical Imaging | 1988

An evaluation of the effectiveness of adaptive histogram equalization for contrast enhancement

J.B. Zimmerman; Stephen M. Pizer; Edward V. Staab; J. R. Perry; W. McCartney; B.C. Brenton

Adaptive histogram equalization (AHE) and intensity windowing have been compared using psychophysical observer studies. Experienced radiologists were shown clinical CT (computerized tomographic) images of the chest. Into some of the images, appropriate artificial lesions were introduced; the physicians were then shown the images processed with both AHE and intensity windowing. They were asked to assess the probability that a given image contained the artificial lesion, and their accuracy was measured. The results of these experiments show that for this particular diagnostic task, there was no significant difference in the ability of the two methods to depict luminance contrast; thus, further evaluation of AHE using controlled clinical trials is indicated.


American Journal of Orthodontics | 1979

Computed tomography: A three-dimensional study of the nasal airway

William M. Montgomery; Peter S. Vig; Edward V. Staab; Stephen R. Matteson

1. Accurate volume measurement of the nasal airway based upon computed tomography images sequentially generated along the length of the airway is possible. 2. The cross-sectional area of the airway at any position along its length can be determined. 3. The most constricted part of the airway is not necessarily at the location of the turbinates. 4. Details of hard- and soft-tissue anatomy not otherwise discernible can be detected with computed tomography imaging.


Journal of Oral and Maxillofacial Surgery | 1989

A method for three-dimensional image reformation for quantitative cephalometric analysis

Stephen R. Matteson; William Bechtold; Ceib Phillips; Edward V. Staab

Recognition and treatment of craniofacial deformities require an understanding of complex skeletal structures in three planes of space. Traditional imaging techniques rely on biplanar radiographs which provide only two-dimensional data. The introduction of three-dimensional image display (3DIR) has provided a method of object analysis in three planes of space, obviating the need for mental reconstruction, and yielding more spatial information than was previously available. This study was undertaken to investigate the quantitative value of three-dimensional images compared with cephalometric techniques in assessing a craniofacial deformity. Metallic marker references were placed on a deformed skull. Measurements taken from cephalograms and three-dimensional images were compared with corresponding digitized and manual measurements taken from the skull. Three-dimensional image reformation provided a more accurate representation of the deformity than the cephalometric methods. Because all structural relationships are preserved in the CT data matrix, measurements are inherently accurate and reproducible. 3DIR offers dynamic advantages over cephalometric methods because data can be manipulated interactively. Further investigation is needed to study the importance of head position and to develop patient selection criteria, scan protocols, and surgical treatment planning algorithms.


Oral Surgery, Oral Medicine, Oral Pathology | 1985

Bone scanning with99mtechnetium phosphate to assess condylar hyperplasia. Report of two cases

Stephen R. Matteson; William R. Proffit; Bill C. Terry; Edward V. Staab; E. Jeff Burkes

Abstract Condylar hyperplasia poses a problem in planning treatment because it is a self-limiting process for some but not all patients. Continued growth creates a progressive deformity that requires condylectomy, whereas an enlarged condyle can be left in place after hyperplastic growth ceases, even if ramus surgery is needed to correct asymmetry. Bone scan with 99m technetium phosphate can be used to assist in making the differential diagnosis. In the two patients reported here, abnormal metabolic activity revealed by bone scans supported clinical and historical evidence that the condylar hyperplasia was active and required surgical correction, including condylectomy. The two cases demonstrate different approaches to postsurgical orthodontic treatment, depending on the amount of normal growth expected.


American Journal of Obstetrics and Gynecology | 1979

Computerized tomography applied to gynecologic oncology

Guy J. Photopulos; William H. McCartney; Leslie A. Walton; Edward V. Staab

Forty patients on the gynecologic oncology service at the University of North Carolina were evaluated with CT scans. Accuracy and clinical benefit of these scans were compared to those of manual clinical examinations. The CT scans were generally superior and had fewer (9) verified errors in the regions of the pelvic wall and para-aortic area than did the manual examinations (17). Both the CT and bimanual examinations had the same number of verified errors (3) in the central pelvic region. The authors found the CT scans to be beneficial in evaluation of pelvic wall and para-aortic regions for treatment planning of either primary or recurrent cancer.


Pediatric Radiology | 1984

Mesenteric cyst: sonographic appearance with CT correlation

Linda L. Geer; Carol A. Mittelstaedt; Edward V. Staab; G. Gaisie

Two cases of mesenteric cysts are reported. Realtime ultrasound demonstrated the typical appearance of well-defined, anechoic masses. In addition, a solid appearance with a honeycomb pattern of internal echos was observed in one case. The other case had the appearance of loculated, septated ascites. Ultrasound and CT correlation are discussed.


Annals of Surgery | 1984

Intraoperative ultrasonography evaluation of the gallbladder in morbidly obese patients.

Charles A. Herbst; Carol A. Mittelstaedt; Edward V. Staab; Joseph A. Buckwalter

Intraoperative ultrasound evaluation of the gallbladder was performed in 55 morbidly obese patients undergoing gastric bariatric surgery. Cholecystectomy was performed in the presence of any physical or ultrasonographic abnormality. Eighteen patients (33%) had cholecystectomy. Nine patients had palpable gallbladder disease confirmed by ultrasound. Nine patients had abnormalities detected by ultrasonography only. There was no false-negative ultrasonographic exam compared to physical exam. Pathologically, all specimens but one showed evidence of disease, thus there was a false-positive incidence of 1.8%. None of the 37 patients with normal physical and ultrasonographic examination have returned with gallbladder disease following the bariatric surgery. Intraoperative ultrasonography shows promise in detecting nonpalpable gallbladder disease and decreasing the incidence of delayed cholecystectomy.


Journal of Computer Assisted Tomography | 1984

Computed tomography in recurrent or metastatic colon cancer: Relation to rising serum carcinoembryonic antigen

Ali Shirkhoda; Edward V. Staab; Leslie A. Bunce; Charles A. Herbst; William H. McCartney

Twenty patients with Stage Duke B or C adenocarcinoma of the colon or rectum who have undergone radical surgical resection and demonstrated rising serum carcinoembryonic antigen (CEA) during follow-up are the subject of this study. In all cases, while there was a continuous and progressive elevation of serum CEA, CT examination of the abdomen and pelvis was performed. Abnormal CT findings were demonstrated in 19 patients and included pelvic mass, liver metastases, and periaortic or mesenteric lymphade-nopathy. There was one normal CT scan in a patient who subsequently developed metastases in the sacrum. Based on the observations in these patients, it is concluded that in routine follow-up after colorectal surgery, rising serum CEA should be considered a warning sign and warrants additional investigation by CT.


The Journal of Urology | 1976

Increased Activity in a Renal Cell Carcinoma Imaged Using 2,3-Dimercaptosuccinic Acid

Sidney J. Pion; Edward V. Staab; Peter S. Stevens

Abstract An unusual case is presented in which a hypervascular renal tumor was imaged as an area of increased activity in a patient with mild renal failure using technetium 2,3-dimercaptosuccinic acid, a renal cortical imaging agent. Possible explanations for this occurrence are discussed.


Computerized Radiology | 1985

CT detection of bowel infarction

John M. Mathis; Mary Ella Zelenik; Edward V. Staab

Bowel infarction is a cause of acute abdominal emergency with high associated morbidity and mortality. Prior to the advent of CT, specific diagnosis was made either by mesenteric angiography or by direct visualization at surgery. This article describes the CT detection of intravascular mesenteric gas as a reliable indication of bowel infarction. Other nonspecific findings associated with bowel infarction and ischemia are also discussed.

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J. R. Perry

University of North Carolina at Chapel Hill

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William H. McCartney

University of North Carolina at Chapel Hill

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Carol A. Mittelstaedt

University of North Carolina at Chapel Hill

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Stephen M. Pizer

University of North Carolina at Chapel Hill

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Ali Shirkhoda

University of North Carolina at Chapel Hill

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Bob G. Thompson

University of North Carolina at Chapel Hill

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Diane C. Rogers

University of North Carolina at Chapel Hill

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Floyd A. Fried

University of North Carolina at Chapel Hill

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Stephen R. Matteson

University of North Carolina at Chapel Hill

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B.C. Brenton

University of North Carolina at Chapel Hill

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