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3181. Classification of breast lesions with multimodality computer-aided diagnosis: observer study results on an independent clinical data set. (Abstract)

. The HIPAA-compliant observer study was conducted with five breast radiologists and five breast imaging fellows, all of whom gave confidence ratings and patient management decisions, both without and with the computer aid, for 97 lesions that were unknown to both the observers and the computer. The performance of each observer without and with the computer aid was quantified by using four performance measures: area under the receiver operating characteristic curve (A(z)) value, partial A(z) value

2006 Radiology

3182. Mild cognitive impairment: apparent diffusion coefficient in regional gray matter and white matter structures. (Abstract)

subjects (seven men, six women; mean age, 75 years +/- 4). This study was approved by the institutional review board and was HIPAA compliant. Each subject gave informed consent. ADC was measured from manually drawn regions of interest (ROIs) of the hippocampus, parahippocampal gyrus, amygdala, corpus callosum, and anterior and posterior cingulate gyrus and from automatically defined frontal, parietal, occipital, and temporal lobes by using template masking. ROIs were outlined on anatomic images

2006 Radiology

3183. Detection of simulated multiple sclerosis lesions on T2-weighted and FLAIR images of the brain: observer performance. (Abstract)

Detection of simulated multiple sclerosis lesions on T2-weighted and FLAIR images of the brain: observer performance. To determine observer performance in the detection of multiple sclerosis (MS) lesions on magnetic resonance (MR) images of the brain and to assess the dependence of observer performance on lesion size, parenchymal location, pulse sequence, and supratentorial versus infratentorial level.This HIPAA-compliant protocol was approved by the institutional review board, and previously

2006 Radiology

3184. Prospective evaluation of vascular complications after liver transplantation: comparison of conventional and microbubble contrast-enhanced US. (Abstract)

Prospective evaluation of vascular complications after liver transplantation: comparison of conventional and microbubble contrast-enhanced US. To prospectively compare diagnostic performance of conventional Doppler ultrasonography (US) and microbubble contrast material-enhanced US for assessment of vascular complications after liver transplantation, with clinical follow-up or angiography as reference standard.This study was approved by institutional review board and was HIPAA compliant. Written

2006 Radiology

3185. Tesio catheter access for long-term maintenance hemodialysis. (Abstract)

Tesio catheter access for long-term maintenance hemodialysis. To retrospectively determine the long-term outcome (>6 months) of placement of tunneled hemodialysis catheters.The HIPAA-compliant study protocol was approved by the Committee on Human Research, which waived the requirement for informed consent. The records of patients who underwent hemodialysis with the Tesio system (Medcomp, Harleysville, Pa) at a single outpatient dialysis unit between March 1994 and March 2004 were reviewed

2006 Radiology

3186. Interobserver agreement for Letournel acetabular fracture classification with multidetector CT: are standard Judet radiographs necessary? (Abstract)

for this HIPAA-compliant study, which included 101 imaging studies performed in 99 patients (78 male, 21 female; mean age, 43 years; age range, 15-86 years) with acetabular fractures. Two musculoskeletal radiologists independently classified the fractures with radiography alone and multidetector CT alone. Multiplanar reformatted and three-dimensional (3D) CT images were reviewed at a computer workstation. Readers were shown radiographs at the end of multidetector CT image reading to see if this would change

2006 Radiology

3187. Distribution of stage I lung cancer growth rates determined with serial volumetric CT measurements. (Abstract)

Distribution of stage I lung cancer growth rates determined with serial volumetric CT measurements. To retrospectively determine the distribution of stage I lung cancer growth rates with serial volumetric computed tomographic (CT) measurements.This study was institutional review board approved and HIPAA compliant. The informed consent requirement was waived. Patients (n = 149) with stage I lung cancer who underwent two pretreatment CT examinations 25 or more days apart were identified

2006 Radiology

3188. MR imaging with remote control: feasibility study in cardiovascular disease. Full Text available with Trip Pro

MR imaging with remote control: feasibility study in cardiovascular disease. The institutional review board approved this HIPAA-compliant study and waived informed consent. The purpose was to retrospectively evaluate remote control magnetic resonance (MR) imaging in complex cardiovascular procedures, whereby operational expertise was made available locally from a remote location. Thirty patients underwent cardiac (12 patients) and/or vascular (30 patients) 1.5-T MR imaging with a remote

2006 Radiology

3189. CT colonography with computer-aided polyp detection: volume and attenuation thresholds to reduce false-positive findings owing to the ileocecal valve. (Abstract)

for the original prospective study. This retrospective study had IRB approval, as well, and was HIPAA-compliant. A total of 496 patients were selected from a larger screening population. CT colonographic images from 394 patients (227 men, 167 women; mean age, 58.0 years; range, 40-79 years) were used as a training set, and images from 102 patients (76 men, 26 women; mean age, 59.8 years; range, 46-79 years) were used as a test set. A series of 2742 volume and attenuation thresholds, for which segmented

2006 Radiology

3190. Active Crohn disease: CT findings and interobserver agreement for enteric phase CT enterography. (Abstract)

Active Crohn disease: CT findings and interobserver agreement for enteric phase CT enterography. To retrospectively evaluate small-bowel enhancement characteristics and the sensitivity, specificity, and interobserver agreement of computed tomographic (CT) findings by using histologic and endoscopic results as a reference standard in patients undergoing enteric phase CT enterography.The institutional review board approved this retrospective HIPAA-compliant study, which included patients who

2006 Radiology

3191. Ductal carcinoma in situ: computer-aided detection in screening mammography. (Abstract)

Ductal carcinoma in situ: computer-aided detection in screening mammography. To retrospectively evaluate the sensitivity of computer-aided detection (CAD) in depicting ductal carcinoma in situ (DCIS) on screening mammograms by using biopsy proved lesion location as the reference standard.Institutional review board approval was obtained, with a waiver of patient informed consent for this HIPAA-compliant study. Findings of all image-guided biopsies with a pathologic diagnosis of DCIS during a 1

2006 Radiology

3192. Operator dependence of physician-performed whole-breast US: lesion detection and characterization. (Abstract)

Operator dependence of physician-performed whole-breast US: lesion detection and characterization. To prospectively examine operator dependence of lesion detection, description, and interpretation when experienced breast radiologists perform whole-breast ultrasonography (US).Institutional review board approval was obtained for the HIPAA-compliant study. Ten women (aged 19-53 years; mean, 37.4 years; 20 breasts) with numerous known breast lesions consented to participate. Eleven breast

2006 Radiology

3193. US appearance of the rotator cable with histologic correlation: preliminary results. (Abstract)

US appearance of the rotator cable with histologic correlation: preliminary results. To characterize the ultrasonographic (US) appearance of the rotator cuff cable in asymptomatic shoulders and in cadaveric specimens, with histologic comparison for the latter.The cadaveric portion of this study was approved by the institution's Anatomical Donations Department. Institutional review board approval and informed consent were obtained from asymptomatic volunteers and clinical patients for the HIPAA

2006 Radiology

3194. Implementation of online radiology quality assurance reporting system for performance improvement: initial evaluation. (Abstract)

Implementation of online radiology quality assurance reporting system for performance improvement: initial evaluation. To evaluate an online system developed and implemented for reporting and managing quality assurance (QA) events occurring in a radiology department.This HIPAA-compliant study had institutional review board approval; informed consent was not required. Using repeated plan-do-study-act cycles, a radiology quality management team applied a 10-step process to implement an online

2006 Radiology

3195. Gallstone detection at CT in vitro: effect of peak voltage setting. (Abstract)

Gallstone detection at CT in vitro: effect of peak voltage setting. This study was a retrospective single-institutional study approved by the Committee on Human Research and was HIPAA compliant. A waiver for informed consent was granted. The purpose of the study was to evaluate the effect of four peak voltage settings on the in vitro conspicuity of gallstones in an anthropomorphic phantom at computed tomography (CT). An anthropomorphic phantom was scanned with (n = 86) or without (n = 85

2006 Radiology

3196. Abdominal aortic aneurysm: can the arterial phase at CT evaluation after endovascular repair be eliminated to reduce radiation dose? (Abstract)

Abdominal aortic aneurysm: can the arterial phase at CT evaluation after endovascular repair be eliminated to reduce radiation dose? To retrospectively determine if arterial phase computed tomographic (CT) imaging is necessary for follow-up imaging of patients who have undergone endovascular stent-graft therapy for abdominal aortic aneurysm.This HIPAA-compliant study was exempt from institutional review board approval; informed patient consent was waived. Eighty-five patients (66 men, 19 women

2006 Radiology

3197. Underestimation of the presence of breast carcinoma in papillary lesions initially diagnosed at core-needle biopsy. (Abstract)

Underestimation of the presence of breast carcinoma in papillary lesions initially diagnosed at core-needle biopsy. To retrospectively determine the degree of underestimation of breast carcinoma diagnosis in papillary lesions initially diagnosed at core-needle biopsy.Institutional review board approval and waiver of informed consent were obtained for this HIPAA-compliant study. Mammographic database review (1994-2003) revealed core biopsy diagnoses of benign papilloma (n=38), atypical papilloma

2007 Radiology

3198. Prediction of seminal vesicle invasion in prostate cancer: incremental value of adding endorectal MR imaging to the Kattan nomogram. (Abstract)

Prediction of seminal vesicle invasion in prostate cancer: incremental value of adding endorectal MR imaging to the Kattan nomogram. To retrospectively determine whether endorectal magnetic resonance (MR) imaging findings contribute incremental value to the Kattan nomogram for predicting seminal vesicle invasion (SVI) in patients with prostate cancer.The institutional review board issued a waiver of authorization, which included a waiver of informed consent, for this HIPAA-compliant study. From

2007 Radiology

3199. Type II endoleak after endoaortic graft implantation: diagnosis with helical CT arteriography. (Abstract)

Type II endoleak after endoaortic graft implantation: diagnosis with helical CT arteriography. To retrospectively assess endoleak shapes and locations within aneurysms to differentiate type II from type I and type III endoleaks.The institutional review board granted an exemption for this HIPAA-compliant study; patient informed consent was not required. A retrospective review of arterial phase helical computed tomographic (CT) studies and medical records was performed for 39 patients (29 men, 10

2006 Radiology

3200. Bayesian network to predict breast cancer risk of mammographic microcalcifications and reduce number of benign biopsy results: initial experience. Full Text available with Trip Pro

institutional review board approved this HIPAA-compliant study; informed consent was not required. Results of 111 consecutive image-guided breast biopsies performed for microcalcifications deemed suspicious by radiologists were analyzed. Mammograms obtained before biopsy were analyzed in a blinded manner by a breast imager who recorded Breast Imaging Reporting and Data System (BI-RADS) descriptors and provided a probability of malignancy. The BN uses probabilistic relationships between breast disease

2006 Radiology

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