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2981. Simulation of liver lesions for pediatric CT. (Abstract)

Simulation of liver lesions for pediatric CT. To develop and validate a technique based on characteristics of real lesions for simulating realistic small liver lesions on pediatric computed tomographic (CT) images.The institutional review board provided exempt status for this study, determined that it was not subject to HIPAA compliance, and did not require informed consent. Patient identification information was removed from clinical images from contrast material-enhanced multi-detector row CT

2006 Radiology

2982. Distinguishing benign from malignant adrenal masses: multi-detector row CT protocol with 10-minute delay. (Abstract)

Distinguishing benign from malignant adrenal masses: multi-detector row CT protocol with 10-minute delay. To retrospectively evaluate the accuracy of precontrast attenuation, relative percentage washout (RPW), and absolute percentage washout (APW) in distinguishing benign from malignant adrenal masses at multi-detector row computed tomography (CT).This HIPAA-compliant retrospective study had institutional review board approval; the need for informed consent was waived. One hundred twenty-two

2006 Radiology

2983. Diagnostic architectural and dynamic features at breast MR imaging: multicenter study. Full Text available with Trip Pro

. Although study data collection was performed before HIPAA went into effect, standards that would be compliant with HIPAA were adhered to. Data from the International Breast MR Consortium trial 6883 were used in the analysis. Women underwent 3D (minimum spatial resolution, 0.7 x 1.4 x 3 mm; minimal temporal resolution, 4 minutes) and dynamic two-dimensional (temporal resolution, 15 seconds) MR imaging examinations. Readers rated enhancement shape, enhancement distribution, border architecture

2006 Radiology

2984. High-performance wavelet compression for mammography: localization response operating characteristic evaluation. (Abstract)

obliterated from all images. The study was HIPAA compliant. An algorithm based on scale-specific quantization of biorthogonal wavelet coefficients was developed for the compression of digitized mammograms with high spatial and dynamic resolution. The method was applied to 500 normal and abnormal mammograms from 278 patients who were 32-85 years old, 85 of whom had biopsy-proved cancer. Film images were digitized with a charge-coupled device-based digitizer. The original and compressed reconstructed images

2006 Radiology

2985. Roux-en-Y gastric bypass surgery for morbid obesity: evaluation of postoperative extraluminal leaks with upper gastrointestinal series. Full Text available with Trip Pro

Roux-en-Y gastric bypass surgery for morbid obesity: evaluation of postoperative extraluminal leaks with upper gastrointestinal series. To retrospectively evaluate the radiographic features of extraluminal leak after Roux-en-Y gastric bypass (RYGBP) surgery at upper gastrointestinal (GI) examinations in a large series of patients and to determine morbidity and mortality in those patients with leak.The investigational review board approved this HIPAA-compliant study, and the need for patient

2006 Radiology

2986. Endorectal MR imaging before salvage prostatectomy: tumor localization and staging. (Abstract)

Endorectal MR imaging before salvage prostatectomy: tumor localization and staging. To evaluate retrospectively the accuracy of endorectal magnetic resonance (MR) imaging for the depiction of tumor, extracapsular extension (ECE), and seminal vesicle invasion (SVI) before salvage prostatectomy in patients with locally recurrent prostate cancer after radiation therapy, by using pathologic analysis as the reference standard.The Institutional Review Board granted exempt status for this HIPAA

2006 Radiology

2987. Prostate cancer: endorectal MR imaging and MR spectroscopic imaging--distinction of true-positive results from chance-detected lesions. (Abstract)

Prostate cancer: endorectal MR imaging and MR spectroscopic imaging--distinction of true-positive results from chance-detected lesions. To retrospectively investigate size criteria for the identification of chance-detected lesions at endorectal magnetic resonance (MR) imaging and MR spectroscopic imaging of prostate cancer.Approval of the committee on human research and written informed consent were obtained. This study was HIPAA compliant. Endorectal MR imaging and MR spectroscopic imaging

2006 Radiology

2988. Osteoporotic compression fractures: outcomes after single- versus multiple-level percutaneous vertebroplasty. (Abstract)

Osteoporotic compression fractures: outcomes after single- versus multiple-level percutaneous vertebroplasty. To compare single- and multiple-level percutaneous vertebroplasty (PV) in terms of pain relief, activity level, and analgesic use in patients with osteoporotic vertebral compression fractures (VCFs).Institutional review board approval and informed consent were obtained, and the study was HIPAA compliant. One hundred seventy-three patients (mean age at treatment, 73.8 years +/- 11.9

2006 Radiology

2989. Optimization of multiplanar reformations from isotropic data sets acquired with 16-detector row helical CT scanner. Full Text available with Trip Pro

Optimization of multiplanar reformations from isotropic data sets acquired with 16-detector row helical CT scanner. Institutional review board approval and waiver of consent were obtained for the patient component of this retrospective HIPAA-compliant study. By using an anthropomorphic phantom and metal oxide semiconductor field effect transistor detectors, radiation dose was determined for one eight-detector row and two 16-detector row computed tomographic (CT) protocols. A custom phantom

2006 Radiology

2990. Carotid artery stent implantation: evaluation with multi-detector row CT angiography and virtual angioscopy--initial experience. (Abstract)

Carotid artery stent implantation: evaluation with multi-detector row CT angiography and virtual angioscopy--initial experience. Approval for this HIPAA-compliant study was obtained from the institutional review board; informed consent was not required for retrospective review of patient studies that had been performed for clinical evaluation. The purpose of this study was to retrospectively compare the accuracy of intrastent luminal diameter, as measured on transverse computed tomographic (CT

2006 Radiology

2991. Low-grade gliomas: dynamic susceptibility-weighted contrast-enhanced perfusion MR imaging--prediction of patient clinical response. (Abstract)

Low-grade gliomas: dynamic susceptibility-weighted contrast-enhanced perfusion MR imaging--prediction of patient clinical response. To determine retrospectively whether relative cerebral blood volume (CBV) measurements can be used to predict clinical response in patients with low-grade gliomas.Approval for this retrospective HIPAA-compliant study was obtained from the Institutional Board of Research Associates, with waiver of informed consent. Thirty-five patients (23 male and 12 female

2006 Radiology

2992. Papillary lesions of the breast at percutaneous core-needle biopsy. (Abstract)

Papillary lesions of the breast at percutaneous core-needle biopsy. To retrospectively review the imaging and histologic findings in patients in whom a benign papillary lesion was diagnosed at core-needle breast biopsy.This retrospective study was approved by the institutional review board at each institution; patient consent was not required. The study was HIPAA compliant. The authors reviewed the findings from 42 patients (age range, 26-76 years; mean age, 54.3 years) with 43 benign papillary

2006 Radiology

2993. Adverse cardiovascular and respiratory events during sedation of pediatric patients for imaging examinations. (Abstract)

Adverse cardiovascular and respiratory events during sedation of pediatric patients for imaging examinations. To retrospectively identify factors associated with an increased risk of adverse cardiovascular or respiratory events during sedation of pediatric patients for imaging examinations.This HIPAA-compliant study was institutional review board approved; the requirement for informed consent was waived. All sedation information--including patient demographics, medications (doses and routes

2005 Radiology

2994. CT images of abdomen and pelvis: effect of nonlinear three-dimensional optimized reconstruction algorithm on image quality and lesion characteristics. (Abstract)

CT images of abdomen and pelvis: effect of nonlinear three-dimensional optimized reconstruction algorithm on image quality and lesion characteristics. The purpose of this study was to retrospectively assess the effect of a postprocessing nonlinear three-dimensional optimized reconstruction algorithm on image quality and lesion characteristics in abdominal and pelvic computed tomographic (CT) images. Institutional review board approved the HIPAA-compliant study protocol; informed consent

2005 Radiology

2995. Tumor cavitation in stage I non-small cell lung cancer: epidermal growth factor receptor expression and prediction of poor outcome. (Abstract)

Tumor cavitation in stage I non-small cell lung cancer: epidermal growth factor receptor expression and prediction of poor outcome. To retrospectively identify radiographic characteristics of stage I non-small cell lung cancer (NSCLC) that may correlate with epidermal growth factor receptor (EGFR) or HER2 expression or with prognosis.This study was approved by the institutional review board, with waiver of informed consent, and was in compliance with HIPAA regulations. Findings of chest

2005 Radiology

2996. Lumbar radiculopathy: treatment with selective lumbar nerve blocks--comparison of effectiveness of triamcinolone and betamethasone injectable suspensions. (Abstract)

by the institutional review board and was HIPAA compliant; informed consent was not required. Charts and self-reported pain score evaluations were retrospectively reviewed in 114 patients (56 men, 58 women; age range, 36-84 years; mean age, 60 years) treated for radiculopathy from 1997 to 2003 with 130 selective lumbar nerve blocks with triamcinolone or betamethasone. Perineural location was confirmed with fluoroscopic guidance. Forty-nine patients received a mixture of 1 mL of the triamcinolone, 40 mg/mL, and 1

2005 Radiology

2997. Hepatic fat fraction: MR imaging for quantitative measurement and display--early experience. (Abstract)

Hepatic fat fraction: MR imaging for quantitative measurement and display--early experience. The institutional review board approved this HIPAA-compliant study. After all five patients with nonalcoholic fatty liver disease signed a consent, they underwent magnetic resonance (MR) imaging for hepatic fat quantification. The purpose of this study was to develop a fast and accurate method to acquire and display quantitative maps of the percentage of hepatic fat. In-phase and out-of-phase gradient

2005 Radiology

2998. Computer-aided detection system for breast masses on digital tomosynthesis mammograms: preliminary experience. Full Text available with Trip Pro

of the data set in this study was HIPAA compliant. The CAD system first screened the three-dimensional volume of the mass candidates by means of gradient-field analysis. Each mass candidate was segmented from the structured background, and its image features were extracted. A feature classifier was designed to differentiate true masses from normal tissues. The CAD system was trained and tested by using a leave-one-case-out method. The classifier calculated a mean area under the test receiver operating

2005 Radiology

2999. Duodenal carcinoids: imaging features with clinical-pathologic comparison. (Abstract)

Duodenal carcinoids: imaging features with clinical-pathologic comparison. To retrospectively evaluate the imaging features of duodenal carcinoids with clinical-pathologic comparison.The institutional review board approved this study; informed consent was not required. The study was HIPAA compliant. The authors retrospectively reviewed the barium studies (n = 20), computed tomographic (CT) scans (n = 16), magnetic resonance (MR) images (n = 2), pathology reports (n = 33), gross pathology

2005 Radiology

3000. The lactating breast: contrast-enhanced MR imaging of normal tissue and cancer. (Abstract)

The lactating breast: contrast-enhanced MR imaging of normal tissue and cancer. To retrospectively describe the magnetic resonance (MR) imaging characteristics of normal breast tissue and breast cancer in the setting of lactation.The HIPAA-compliant study was exempt from institutional approval, and informed consent was not required. Unilateral MR imaging of 10 breasts was performed in seven lactating patients aged 27-42 years. For the three patients in whom both breasts were imaged, each breast

2005 Radiology

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