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3101. Evidence-based target recall rates for screening mammography. Full Text available with Trip Pro

of the IRBs were followed. The study was HIPAA compliant. Recall rate was defined as the percentage of screening studies for which further work-up was recommended by the radiologist. Sensitivity was defined as the proportion of cancers that were detected at screening mammography. Piecewise linear regression was used to model sensitivity as a function of recall rate. This model allows detection of critical recall rates in which significant changes (shifts) occurred in the rates that sensitivity increased

2007 Radiology

3102. Detection of pulmonary vein and left atrial scar after catheter ablation with three-dimensional navigator-gated delayed enhancement MR imaging: initial experience. (Abstract)

written informed consent; the study was approved by the local institutional review board and was HIPAA compliant. A high-spatial-resolution free-breathing delayed enhancement MR imaging method was developed to detect scar (ie, ablated tissue) in the LA and pulmonary veins (PVs). The LA in 15 patients before ablation and in 18 patients at least 30 days after ablation was examined. A reader with 4 years of experience assessed presence of delayed enhancement on images and circumferential completeness

2007 Radiology

3103. Advanced hepatocellular carcinoma: CT perfusion of liver and tumor tissue--initial experience. (Abstract)

Advanced hepatocellular carcinoma: CT perfusion of liver and tumor tissue--initial experience. To prospectively assess computed tomographic (CT) perfusion for evaluation of tumor vascularity of advanced hepatocellular carcinoma (HCC) and to correlate CT perfusion parameters with tumor grade and serum markers.The study was HIPAA compliant and was approved by the institutional review board. Patients provided informed consent. Thirty patients (22 men, eight women; mean age, 60 years; range, 28-79

2007 Radiology

3104. Complications of diagnostic cerebral angiography: evaluation of 19,826 consecutive patients. Full Text available with Trip Pro

Complications of diagnostic cerebral angiography: evaluation of 19,826 consecutive patients. To retrospectively evaluate the complications of diagnostic cerebral catheter angiography in 19,826 consecutive patients.This HIPAA-compliant study had institutional review board approval, with waiver of informed consent. Demographic, procedural, and complication data in 19 826 consecutive patients undergoing diagnostic cerebral angiography at one institution from 1981 through 2003 were retrospectively

2007 Radiology

3105. Multidetector CT of the paranasal sinus: potential for radiation dose reduction. (Abstract)

Multidetector CT of the paranasal sinus: potential for radiation dose reduction. The aim of the study was to retrospectively determine the potential for radiation dose reduction at multidetector computed tomography (CT) of the paranasal sinus by using computer simulation of the effect of low-radiation dose acquisition on diagnostic image quality. This HIPAA compliant study was approved by the institutional human research committee. The need for informed patient consent was waived. Twenty

2007 Radiology

3106. Virtual autopsy: two- and three-dimensional multidetector CT findings in drowning with autopsy comparison. (Abstract)

Virtual autopsy: two- and three-dimensional multidetector CT findings in drowning with autopsy comparison. To retrospectively determine the multidetector computed tomographic (CT) virtual autopsy findings of death by drowning in comparison with autopsy findings.The institutional review board of the Armed Forces Institute of Pathology approved this HIPAA-compliant study and did not require informed consent by the next of kin. Total-body multidetector CT was performed, immediately prior

2007 Radiology

3107. Percutaneous radiofrequency ablation of hepatic tumors against the diaphragm: frequency of diaphragmatic injury. (Abstract)

Percutaneous radiofrequency ablation of hepatic tumors against the diaphragm: frequency of diaphragmatic injury. To retrospectively determine the frequency of diaphragmatic injury when percutaneous hepatic radiofrequency (RF) ablation is performed adjacent to the diaphragm.Institutional Review Board approval was obtained for our HIPAA-compliant study. Informed consent for the ablation procedure and for use of related data for future research was obtained from each patient. A retrospective

2007 Radiology

3108. Lytic metastases in thoracolumbar spine: computer-aided detection at CT--preliminary study. (Abstract)

Lytic metastases in thoracolumbar spine: computer-aided detection at CT--preliminary study. To evaluate the sensitivity of a computer-aided detection (CAD) system for detection of lytic thoracolumbar spinal lesions at body CT, with results of manual lesion segmentation as the reference standard.The study was HIPAA compliant and institutional review board approved; the institutional review board waived the need for informed consent. The CAD system segments the spine on CT images and searches

2007 Radiology

3109. Does radiologist recommendation for follow-up with the same imaging modality contribute substantially to high-cost imaging volume? (Abstract)

Does radiologist recommendation for follow-up with the same imaging modality contribute substantially to high-cost imaging volume? To retrospectively measure repeat rates for high-cost imaging studies, determining their causes and trends, and the impact of radiologist recommendations for a repeat examination on imaging volume.This HIPAA-compliant study had institutional review board approval, with waiver of informed consent. Repeat examination was defined as a same-modality examination

2007 Radiology

3110. High-spatial-resolution whole-body MR angiography with high-acceleration parallel acquisition and 32-channel 3.0-T unit: initial experience. (Abstract)

High-spatial-resolution whole-body MR angiography with high-acceleration parallel acquisition and 32-channel 3.0-T unit: initial experience. The purpose of this HIPAA-compliant study was to prospectively evaluate the technical feasibility of a multistation high-spatial-resolution whole-body magnetic resonance (MR) angiography protocol in which high-acceleration parallel imaging (with acceleration factors of three and four) is performed with a 32-channel 3.0-T MR system. After institutional

2007 Radiology

3111. Lower extremity deep venous thrombosis: evaluation with ferumoxytol-enhanced MR imaging and dual-contrast mechanism--preliminary experience. (Abstract)

Lower extremity deep venous thrombosis: evaluation with ferumoxytol-enhanced MR imaging and dual-contrast mechanism--preliminary experience. Institutional review board approval and informed consent were obtained for this HIPAA-compliant study, whose purpose was to prospectively evaluate the use of a dual-contrast mechanism in conjunction with an iron oxide blood pool contrast agent, ferumoxytol, to depict deep venous thrombosis (DVT). Nine patients with lower extremity DVT detected with duplex

2007 Radiology

3112. Pulmonary embolism: prognostic CT findings. (Abstract)

in compliance with HIPAA regulations. A total of 1193 patients with CT scans positive for PE from January 1, 1997, to December 31, 2002, who had given authorization for retrospective research were included. Scans were independently reviewed by two observers. CT findings were compared with risk of death by using univariate analysis (chi(2) statistic) and multivariate logistic regression. Interobserver variability (kappa statistic or intraclass correlation coefficient), sensitivity, and specificity of CT

2007 Radiology

3113. Pulmonary arterial hypertension: noninvasive detection with phase-contrast MR imaging. (Abstract)

Pulmonary arterial hypertension: noninvasive detection with phase-contrast MR imaging. To retrospectively identify pulmonary arterial (PA) flow parameters measured with phase-contrast magnetic resonance (MR) imaging that allow noninvasive diagnosis of chronic PA hypertension (PAH).The study was HIPAA compliant and was approved by the institutional review board; a waiver of informed consent was obtained. Fifty-nine patients (49 female patients; mean age, 46 years; range, 16-85 years) known

2007 Radiology

3114. Digital mammography: effects of reduced radiation dose on diagnostic performance. (Abstract)

Digital mammography: effects of reduced radiation dose on diagnostic performance. To experimentally determine the relationship between radiation dose and observer accuracy in the detection and discrimination of simulated lesions for digital mammography.This HIPAA-compliant study received institutional review board approval; the informed consent requirement was waived. Three hundred normal craniocaudal images were selected from an existing database of digital mammograms. Simulated mammographic

2007 Radiology

3115. Multi-detector row CT of the small bowel: peak enhancement temporal window--initial experience. (Abstract)

Multi-detector row CT of the small bowel: peak enhancement temporal window--initial experience. To prospectively determine quantitatively and qualitatively the timing of maximal enhancement of the normal small-bowel wall by using contrast material-enhanced multi-detector row computed tomography (CT).This HIPAA-compliant study was approved by the institutional review board. After information on radiation risk was given, written informed consent was obtained from 25 participants with no history

2007 Radiology

3116. Pulmonary hypertension: accuracy of detection with left ventricular septal-to-free wall curvature ratio measured at cardiac MR. (Abstract)

(RHC) as the reference standard.Institutional review board approval was received for this HIPAA-compliant study. Sixty-one patients clinically known or suspected of having PH underwent cardiac MR and RHC on the same day. Interventricular septal curvature (C(IVS)) and left ventricular free wall curvature (C(FW)) measured at end systole were used to derive the curvature ratio (C(IVS)/C(FW)). Effective distending transmural pressure (dP(FW)) and transseptal pressure gradient (dP(IVS)) were assumed

2007 Radiology

3117. Frequency, management, and outcome of extravasation of nonionic iodinated contrast medium in 69,657 intravenous injections. (Abstract)

Frequency, management, and outcome of extravasation of nonionic iodinated contrast medium in 69,657 intravenous injections. To determine retrospectively the frequency, management, and outcomes of extravasations of intravenously injected nonionic iodinated contrast medium.Institutional review board approval was obtained, and the requirement for informed consent was waived. The study was HIPAA compliant. For 69,657 intravenous injections of nonionic iodinated contrast medium for computed

2007 Radiology

3118. Vertebroplasty in the United States: guidance method and provider distribution, 2001-2003. (Abstract)

Vertebroplasty in the United States: guidance method and provider distribution, 2001-2003. To use the nationwide Medicare database to retrospectively evaluate the provider distribution for vertebroplasty, as well as the guidance method used in the United States.Use of the Medicare database was exempt from Institutional Review Board review and informed consent; regarding HIPAA compliance, the Medicare database lacks unique patient identifiers. Using the 2001, 2002, and 2003 United States

2007 Radiology

3119. Detection of bone metastases: assessment of integrated FDG PET/CT imaging. (Abstract)

Detection of bone metastases: assessment of integrated FDG PET/CT imaging. To retrospectively evaluate the positive predictive value (PPV) of fluorine 18 fluorodeoxyglucose (FDG) positron emission tomography (PET)/computed tomography (CT) in the identification of malignant bone lesions when the PET and CT findings are discordant and concordant.The study conformed to HIPAA standards, and the need for informed consent was waived by the institutional review board that approved the study. FDG PET

2007 Radiology

3120. Three-dimensional black-blood MR imaging of carotid arteries with segmented steady-state free precession: initial experience. (Abstract)

Three-dimensional black-blood MR imaging of carotid arteries with segmented steady-state free precession: initial experience. This HIPAA-compliant study had institutional review board approval. Informed consent was obtained. The purpose was to prospectively evaluate a segmented three-dimensional (3D) double inversion recovery (DIR)-prepared steady-state free precession (SSFP) magnetic resonance (MR) imaging sequence for fast high-spatial-resolution black-blood carotid arterial wall imaging

2007 Radiology

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