abstract：RATIONALE AND OBJECTIVES:The authors evaluated changes of lung attenuation in pigs, with special attention to the mosaic pattern of low attenuation, at thin-section computed tomography (CT) after obstruction of the proximal pulmonary artery with a detachable balloon. MATERIALS AND METHODS:In seven pigs, nine sites of ...

journal_title：Academic radiology

authors： Kim TK,Im JG,Kim SH,Won HJ,Seo JB,Yeon KM,Han MC

更新日期：1998-12-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors evaluated the reliability and validity of an experimental radiology faculty appraisal instrument. MATERIALS AND METHODS:Residents from the University of Wisconsin (UW) and Indiana University (IU) were asked to use a previously developed behaviorally based, 53-item experimental facu...

journal_title：Academic radiology

authors： Collins J,Albanese MA,Scanlan KA,Propeck PA,Jackson VP

更新日期：1998-11-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:Abdominal radiologists actively participated and provided subspecialty radiologic expertise in a multidisciplinary gastrointestinal cancer clinic that served a tertiary referral center. The purpose of this study was to evaluate the feasibility and nonradiologists' opinions of this new approach ...

journal_title：Academic radiology

authors： Silverman SG,Khorasani R,Adams DF,Phillips MD,Sica GT,Mayer RJ

更新日期：1998-10-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:This study was performed to determine physical characteristics of areas on chest radiographs that are suspicious but not definitive for the presence of a pulmonary nodule and the characteristics of areas that contain an obvious nodule. MATERIALS AND METHODS:Two groups of patients were identifi...

journal_title：Academic radiology

authors： Drayer JA,Vittitoe NF,Vargas-Voracek R,Baydush AH,Ravin CE,Floyd CE Jr

更新日期：1998-09-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors attempted to determine whether the use of nonionic contrast media causes uptake of iodine by the thyroid to be blocked and whether use of these agents could cause iodine-induced hyperthyroidism. MATERIALS AND METHODS:Twenty-eight persons, including 22 with thyroid disease, were inc...

journal_title：Academic radiology

authors： Nygaard B,Nygaard T,Jensen LI,Court-Payen M,Søe-Jensen P,Nielsen KG,Fugl M,Hansen JM

更新日期：1998-06-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors developed a computerized method for delineating the costophrenic angles in digital posteroanterior chest radiographs to derive quantitative information that allows for detection of abnormal blunting of the costophrenic angle. MATERIALS AND METHODS:An automated lung-segmentation sch...

journal_title：Academic radiology

authors： Armato SG 3rd,Giger ML,MacMahon H

更新日期：1998-05-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors evaluated whether fast spectroscopic imaging of water and fat resonances can produce high-quality anatomic magnetic resonance (MR) images of rodent tumors and human breast. MATERIALS AND METHODS:Fast MR spectroscopic images of eight rats with mammary tumors were acquired by using a...

journal_title：Academic radiology

authors： Kovar DA,Al-Hallaq HA,Zamora MA,River JN,Karczmar GS

更新日期：1998-04-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:Prospective studies of radiologists' interpretations of selected radiographs reported 20-40 years ago indicated error rates of 30% and higher. The authors retrospectively evaluated the interpretations of groups of radiologists and determined a range of rates of disagreement in interpretation. Q...

journal_title：Academic radiology

authors： Siegle RL,Baram EM,Reuter SR,Clarke EA,Lancaster JL,McMahan CA

更新日期：1998-03-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The American Association of Academic Chief Residents in Radiology annually surveys residency programs on a variety of issues related to residency training. The survey results allow individual programs to compare features of their programs with national averages and to gauge trends in radiology ...

journal_title：Academic radiology

authors： Heck DV,Vaughan TE,Duncan JR,Evens RG

更新日期：1998-03-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:To assess the usefulness of classifying degree of difficulty in abnormality detection and to determine the effect of knowing the true diagnosis when selecting subtle images for observer-performance studies. MATERIALS AND METHODS:A total of 529 posteroanterior chest images that had been used in...

journal_title：Academic radiology

authors： Rockette HE,King JL,Thaete FL,Fuhrman CR,Slifko RM,Gur D

更新日期：1998-02-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors studied the role of the endothelium and associated endothelial pathways in contrast material-induced renal vasoconstriction. MATERIALS AND METHODS:Isometric contractions in human and rabbit renal artery rings with intact and denuded endothelium were stimulated with phenylephrine an...

journal_title：Academic radiology

authors： Drescher P,Madsen PO

更新日期：1997-12-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The goal of this prospective, interinstitutional study was to compare the long-term instructional effectiveness of a pediatric multimedia textbook (MMTB) to that of a standard lecture and a printed textbook. MATERIALS AND METHODS:A randomized cohort of 89 3rd-year medical students from two ins...

journal_title：Academic radiology

authors： D'Alessandro DM,Kreiter CD,Erkonen WE,Winter RJ,Knapp HR

更新日期：1997-11-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:This study was undertaken to develop a standard that can be used to assess new high-resolution collateral zone imaging methods. MATERIALS AND METHODS:The authors performed ex vivo helical CT in seven pig hearts after microsphere studies of blood flow and coronary angiography. They compared the...

journal_title：Academic radiology

authors： Pearlman JD,Laham RJ,Simons M,Gladstone S,Raptopoulos V

更新日期：1997-10-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors performed this study to determine whether intrathoracic inoculation of non-small-cell lung carcinoma with fluoroscopic guidance would provide for more accurate implantation. MATERIALS AND METHODS:A tumor cell inoculum (2 x 10(6) cells per 0.15 mL) was injected percutaneously under ...

journal_title：Academic radiology

authors： Hamide JP,Qian Z,Xu H,Diethelm L,Skrepnik N,Castaneda-Zuniga WR,Hunt JD

更新日期：1997-09-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:To determine graduating medical students' perceptions of radiology and to document changes in their perceptions since they entered medical school. MATERIALS AND METHODS:A survey questionnaire was distributed to 213 graduating students. Questions were similar to those answered by the same group...

journal_title：Academic radiology

authors： Kazerooni EA,Blane CE,Schlesinger AE,Vydareny KH

更新日期：1997-08-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors evaluated the coordination of swallowing and respiration in dysphagic patients. MATERIALS AND METHODS:Video fluoroscopy and respirometry were performed simultaneously during 98 swallows in 33 patients (18 women, 15 men) with a median age of 70 years (interquartile range, 52-78 year...

journal_title：Academic radiology

authors： Nilsson H,Ekberg O,Bülow M,Hindfelt B

更新日期：1997-07-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors used magnetic resonance (MR) imaging to investigate the correlation between T2* measurements of trabecular bone and the ultimate compressive strength of lumbar porcine vertebrae. METHODS:Five pigs that weighted 25-32 kg were sacrificed and imaged with a 1.5-T MR system. T2* of the ...

journal_title：Academic radiology

authors： Brismar TB,Hindmarsh T,Ringertz H

更新日期：1997-06-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors evaluated the involvement of nitric oxide and endothelin in radiographic contrast medium-induced changes in renal hemodynamics. METHODS:Eleven anesthetized healthy dogs were each studied during three periods. Thirty minutes before the first, second, and third periods, the dogs rece...

journal_title：Academic radiology

authors： Bagnis C,Idee JM,Dubois M,Jacquiaud C,Maistre G,Jacobs C,Deray G

更新日期：1997-05-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors evaluated radiologic consultation affecting resident physician ordering of relatively expensive imaging studies. METHODS:Requisitions (n = 180) for expensive imaging studies from three general medicine floors (two consultation floors, one control floor) were prospectively evaluated...

journal_title：Academic radiology

authors： Gottlieb RH,Hollenberg GM,Fultz PJ,Rubens DJ

更新日期：1997-03-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The authors evaluated the diagnostic accuracy of viewing computed tomographic (CT) scans as film versus soft-copy images at a workstation. METHODS:Receiver operating characteristic analysis of the interpretation of 202 CT scans (103 were normal, 99 were abnormal) by five neuroradiologists was ...

journal_title：Academic radiology

authors： el-Saden SM,Hademenos GJ,Zhu W,Sayre JW,Glenn B,Steidler J,Kode L,King B,Quinones D,Valentino DJ,Bentson JR

更新日期：1997-02-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:Several methods have been proposed for calculating the variances and covariances of nonparametric estimates of the area under receiver operating characteristic curves (AUC). The authors provide an explanation of the relationships between them and illustrate the factors that determine sampling v...

journal_title：Academic radiology

authors： Hanley JA,Hajian-Tilaki KO

更新日期：1997-01-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:Renovascular smooth muscle contractility, an important factor in contrast media-induced nephrotoxicity, depends on intracellular Ca2+ concentration, which is composed of extracellular Ca2+ influx and intracellular Ca2+ release. These factors were investigated in contrast media-induced renal vas...

journal_title：Academic radiology

authors： Drescher P,Rauch D,Madsen PO

更新日期：1996-11-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:Extraintestinal abnormalities visible without contrast material on abdominal radiographs are reported less frequently when contrast examinations are performed. Gaze dwell time was used to determine whether this difference is due to failure by observers to scan plain-film regions of contrast stu...

journal_title：Academic radiology

authors： Berbaum KS,Franken EA Jr,Dorfman DD,Miller EM,Krupinski EA,Kreinbring K,Caldwell RT,Lu CH

更新日期：1996-10-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:We systematically characterized the information provided by chest radiography reports on a nationally representative sample of 822 elderly patients hospitalized in 297 acute-care hospitals in five states who had an admission diagnosis of congestive heart failure, acute myocardial infarction, or...

journal_title：Academic radiology

authors： Sobel JL,Pearson ML,Gross K,Desmond KA,Harrison ER,Rubenstein LV,Rogers WH,Kahn KL

更新日期：1996-09-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:This study compared the safety and efficacy of iodixanol with those of ioxaglate in adult patients undergoing aortography or peripheral arteriography. METHODS:Forty-six patients were enrolled in this controlled, randomized, double-blind, two-center study. The patients were monitored for advers...

journal_title：Academic radiology

authors： Rosenblum JD,Siegel EL,Leef J,Eckard DA,Lu CT

更新日期：1996-09-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:We investigated the influence of muscular activity and regional body temperature changes on the accumulation of intravenously (i.v.) administered, dextran-coated superparamagnetic iron oxide (SPIO) particles in the lymph nodes of rats. METHODS:Four groups of rats (N = 21) were used. Five rats ...

journal_title：Academic radiology

authors： Elste V,Wagner S,Taupitz M,Pfefferer D,Kresse M,Hamm B,Berg R,Wolf KJ,Semmler W

更新日期：1996-08-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:We evaluated the effectiveness of a fluorine-acryl-styrene-urethane-silicone (FASUS) copolymer as an antithrombogenic coating material for intravascular stents in dogs. METHODS:FASUS copolymer-coated stents were placed in the right iliac veins, and uncoated 304 stainless steel stents were plac...

journal_title：Academic radiology

authors： Matsuhashi T,Miyachi H,Ishibashi T,Sakamoto K,Yamadera A

更新日期：1996-07-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The development of curriculum guidelines for radiology residency has been found to be favored by 80% of program directors (PDs) nationwide. I surveyed PDs to develop a consensus of opinion concerning minimum training requirements in the subspecialty rotations. METHODS:A survey developed by mem...

journal_title：Academic radiology

authors： Rao VM

更新日期：1996-06-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:We examined whether high-resolution computed tomography (HRCT) would detect and quantify induced airway changes in asthmatic volunteers. METHODS:We performed pulmonary function tests and HRCT on eight asthmatic adults and two nonasthmatic control adults under three conditions: baseline, after ...

journal_title：Academic radiology

authors： Kee ST,Fahy JV,Chen DR,Gamsu G

更新日期：1996-05-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:Computed radiography provides correct optical density on film, independent of the incident radiation exposure, but it can result in under- or overexposure of the imaging plate. In the current study, we evaluated the radiation exposure trends of computed radiography over a 2-year period for port...

journal_title：Academic radiology

authors： Seibert JA,Shelton DK,Moore EH

更新日期：1996-04-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:Amphiphilic biocompatible polyoxyethylene (PEO)-based polymers form particles (micelles) that are 10-50 nm in diameter. In the current research, we successfully incorporated amphiphilic indium-111 (111In) and gadolinium chelates into these particles and used them as particulate contrast media i...

journal_title：Academic radiology

authors： Trubetskoy VS,Frank-Kamenetsky MD,Whiteman KR,Wolf GL,Torchilin VP

更新日期：1996-03-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:We compared computed radiography (CR) with a film digitizer as an image input device for transmitting radiographs to intensive care unit (ICU) displays. METHODS:Limiting spatial resolution and low-contrast detectability performance were determined for a 600-speed screen-film combination and CR...

journal_title：Academic radiology

authors： Huda W,Honeyman JC,Palmer CK,Frost MM,Staab EV

更新日期：1996-02-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:We developed a technique for estimating the volumes of distribution and intratumoral ethanol concentrations using computed tomography (CT) scanning in patients undergoing percutaneous ethanol injection (PEI) treatment of malignant hepatic tumors. METHODS:A phantom containing anhydrous ethanol ...

journal_title：Academic radiology

authors： Alexander DG,Unger EC,Seeger SJ,Karmann S,Krupinski EA

更新日期：1996-01-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:The pathogenesis of brain injury following radiosurgery is poorly understood. To better elucidate the relationship between blood-brain barrier disruption and metabolic derangements, we used magnetic resonance (MR) imaging and 1H MR spectroscopy to detect early changes from focused single-fracti...

journal_title：Academic radiology

authors： Omary RA,Berr SS,Kamiryo T,Lanzino G,Kassell NF,Lee KS,Lopes MB,Hillman BJ

更新日期：1995-12-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:Contrast agents have been shown to produce vasodilatory responses in several vascular beds. To our knowledge, however, their effect on the bronchial vasculature has not been examined. Clinically, contrast-induced bronchial vasodilation could potentially exacerbate life-threatening pulmonary hem...

journal_title：Academic radiology

authors： Baile EM,Mayo JR,Sasaki F,Bai TR,Paré PD

更新日期：1995-11-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:We compared the peritumoral vascular definition in rats using either a paramagnetic extracellular or a macromolecular contrast medium in combination with high-resolution magnetic resonance (MR) imaging. METHODS:High-resolution, three-dimensional spoiled gradient-refocused acquisition in a stea...

journal_title：Academic radiology

authors： Schwickert HC,Stiskal M,van Dijke CF,Roberts TP,Mann JS,Demsar F,Brasch RC

更新日期：1995-10-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:We investigated the methodologic development of computed microtomography (CMT) for monitoring the development of osteoporosis in male Sprague-Dawley rats. METHODS:Eight rats were gastrectomized and eight rats were sham operated. Femurs, tibias, and tails were prepared, and CMT scans with spati...

journal_title：Academic radiology

authors： Stenström M,Olander B,Carlsson CA,Carlsson GA,Håkanson R

更新日期：1995-09-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:We investigated a computer-aided detection (CAD) scheme for clustered microcalcifications in digitized mammograms. METHODS:A multistage CAD scheme was developed and tested. To increase sensitivity, the scheme uses a Gaussian band-pass filter and nonlinear threshold. A multistage local minimum ...

journal_title：Academic radiology

authors： Zheng B,Chang YH,Staiger M,Good W,Gur D

更新日期：1995-08-01 00:00:00

abstract：RATIONALE AND OBJECTIVES:Patients with a posterior indentation in the pharyngoesophageal segment (PES) are generally considered to have an abnormality of the cricopharyngeal muscle (CPM). In this study we determined the actual width of the PES and the pressure circumstances during swallowing within the pharynx and PES ...

journal_title：Academic radiology

authors： Olsson R,Ekberg O

更新日期：1995-07-01 00:00:00

abstract：:The quality of medical images must be quantified with reference to specific diagnostic tasks. Image quality is limited by fundamental physics, engineering limitations, radiation safety concerns, and imaging time constraints (among other things). There is now a gold standard for assessing human visual decision performa...

journal_title：Academic radiology

authors： Burgess A

更新日期：1995-06-01 00:00:00