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- What Is Evidence-Based Medicine? Critical Thinking Skills Symposium
- Evidence-based medicine EBM, also called evidence based health care, was developed because of the awareness of the limitations of traditional determinants. The principles of EBM offer a useful solution to clinical problems to acquire valid and current information for clinical and policy decisions. EBM is defined as the process of...
- White papers 2004-02-01
- Bayesian Regression Methodology for Estimating a Receiver Operating Characteristic Curve With Two Radiologic Applications: Prostate Biopsy and Spiral CT of Ureteral Stones
- This paper provides evaluation on two Bayesian regression models for receiver operating characteristic ROC curve analysis of continuous diagnostic outcome data with covariates. The diagnostic tests were accurate in both examples. PSA levels were most accurate for staging prostate cancer among intermediate-risk patients. Stone size was predictive of treatment option...
- White papers 2001-08-01
- Comparison of Correlated Receiver Operating Characteristic Curves Derived From Repeated Diagnostic Test Data
- It is common to administer the same diagnostic test more than once to the same set of patients. The purpose of this paper was to develop two statistical methods for estimating and comparing correlated receiver operating characteristic ROC curves for data derived from repeated diagnostic tests. The two transformation models...
- White papers 2001-03-01
- Feasibility of MR Imaging-Guided Breast Lumpectomy for Malignant Tumors in a 0.5-T Open-Configuration MR Imaging System
- This paper describes about the development in the technology for and evaluates the utility of a 0.5-T vertical open-configuration magnetic resonance MR imaging system for imaging-guided breast lumpectomy of malignant tumors. All breast lesions were identified despite limited spatial resolution and fat-suppression techniques. The evolved techniques facilitated intraoperative margin evaluation...
- White papers 2002-07-24
- Quantitative MR Imaging Assessment of Prostate Gland Deformation Before and During MR Imaging-Guided Brachytherapy
- This paper documents the deformations that occur between pretreatment magnetic resonance MR imaging and intraoperative MR imaging during brachytherapy. There were significant deformations in the shape of the prostate, especially in the peripheral zone, between the two imaging studies. The likely causes of the shape change are differences in rectal...
- White papers 2002-07-24
- Comparison of Accuracy and Interreader Agreement in Side-by-Side Versus Independent Evaluations of MR Imaging of the Medial Collateral Ligament of the Elbow
- The objective of this paper is comparing independent and side-by-side evaluation of magnetic resonance MR images of the medial collateral ligament MCL of the elbow, with regard to sensitivity, specificity, and interreader agreement. Observer performance is superior when multiple MR imaging pulse sequences are reviewed simultaneously rather than independently and...
- White papers 2002-04-15
- Superconducting RF Coils for Clinical MR Imaging at Low Field
- A number of recent reports in the MRI literature have established that substantial signal-tonoise ratio SNR gains can be achieved with small samples or low resonance frequencies, through the use of high-quality factor high-temperature superconducting HTS RF receive coils. We show the application of HTS coils to the imaging of...
- White papers 2003-08-25
- Statistical Validation Based on Parametric Receiver Operating Characteristic Analysis of Continuous Classification Data
- The objective of this paper is accuracy of diagnostic test and imaging segmentation is important in clinical practice because it has a direct impact on therapeutic planning. Statistical validations of classification accuracy were conducted based on parametric receiver operating characteristic analysis, illustrated on three radiologic examples. All clinical examples yielded...
- White papers 2003-12-02
- Level Set-Based Integration of Segmentation and Computational Fluid Dynamics for Flow Correction in Phase Contrast Angiography
- The objective of this paper is a novel method to correct flow data from magnetic resonance phase contrast (MR-PC) angiography, based on combining computational fluid dynamics and segmentation in a level set framework, was developed and tested in this study. Applying this procedure to both synthetic and clinical data, significant...
- White papers 2003-12-02
- Comparison of Single-Shot Echo-Planar and Line Scan Protocols for Diffusion Tensor Imaging
- Both single-shot diffusion-weighted echo-planar imaging EPI and line scan diffusion imaging LSDI can be used to obtain magnetic resonance diffusion tensor data and to calculate directionally invariant diffusion anisotropy indices, i.e., indirect measures of the organization and coherence of white matter fibers in the brain. Because EPI is the most...
- White papers 2004-02-01
- Statistical Validation of Image Segmentation Quality Based on a Spatial Overlap Index: Scientific Reports
- Magnetic resonance imaging MRI provides indispensable information about anatomy and pathology, enabling quantitative pathologic and clinical evaluations. Segmentation is an important image-processing step by which regions of an image are classified according to the presence of relevant anatomic features. The DSC value is a simple and useful summary measure of...
- White papers 2004-02-01
- A Detailed Audit of Reimbursement for Abdominal CT in an Academic Practice
- Declining fee schedules, decreasing operating margins and increasingly stringent compliance regulations create a need for intense scrutiny and optimization of a radiology organization's billing and collection procedures. This papers goal was to analyze the effectiveness of departmental professional billing procedures, identify controllable factors, and intervene when they could be improved....
- White papers 2001-05-10
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