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3081. The cisterna chyli: enhancement on delayed phase MR images after intravenous administration of gadolinium chelate. (Abstract)

The cisterna chyli: enhancement on delayed phase MR images after intravenous administration of gadolinium chelate. To retrospectively evaluate cisterna chyli (CC) enhancement on magnetic resonance (MR) images obtained after intravenous administration of a gadolinium-based contrast agent.This retrospective HIPAA-compliant study of 1.5-T MR imaging findings was institutional review board approved; informed patient consent was waived. All MR examinations involved the acquisition of heavily T2

2007 Radiology

3082. Discordance between CT and angiography in the PIOPED II study. (Abstract)

Discordance between CT and angiography in the PIOPED II study. To retrospectively evaluate the causes of discordant computed tomographic (CT)-angiographic readings from the Prospective Investigation of Pulmonary Embolism Diagnosis, or PIOPED, II study.Institutional review board approval was obtained for this HIPAA-compliant study. Of 1036 patients suspected of having pulmonary embolism who were examined with CT, 226 underwent angiography; 206 patients had concordant results and 20 had

2007 Radiology

3083. Multiple sclerosis: hyperintense lesions in the brain on nonenhanced T1-weighted MR images evidenced as areas of T1 shortening. (Abstract)

Multiple sclerosis: hyperintense lesions in the brain on nonenhanced T1-weighted MR images evidenced as areas of T1 shortening. To retrospectively document hyperintense lesions on nonenhanced T1-weighted magnetic resonance (MR) images in patients with multiple sclerosis (MS) and study their relationship to physical disability, disease course, and other MR markers of tissue damage (brain atrophy).Institutional review board approval was obtained; informed consent was waived for this HIPAA

2007 Radiology

3084. Abduction and external rotation in shoulder impingement: an open MR study on healthy volunteers initial experience. (Abstract)

Abduction and external rotation in shoulder impingement: an open MR study on healthy volunteers initial experience. To prospectively evaluate rotator cuff contact with the glenoid in healthy volunteers placed in the unloaded and loaded abduction and external rotation (ABER) positions in an open magnetic resonance (MR) imager.The study was institutional review board approved and HIPAA compliant, and informed consent was received. Eight male volunteers with no history of shoulder pain

2007 Radiology

3085. Hepatocellular carcinoma with indeterminate or false-negative findings at initial MR imaging: effect on eligibility for curative treatment initial observations. (Abstract)

Hepatocellular carcinoma with indeterminate or false-negative findings at initial MR imaging: effect on eligibility for curative treatment initial observations. To retrospectively evaluate the effect of indeterminate or false-negative findings at magnetic resonance (MR) imaging on eligibility for curative treatment of hepatocellular carcinoma (HCC).This HIPAA-compliant retrospective study was approved by the institutional review board; the need for informed consent was waived. Of 166 patients

2007 Radiology

3086. Breast lesions: imaging with contrast-enhanced subharmonic US--initial experience. (Abstract)

Breast lesions: imaging with contrast-enhanced subharmonic US--initial experience. To prospectively compare accuracy of gray-scale subharmonic imaging (SHI) with that of standard gray-scale ultrasonography (US), power Doppler US (with and without contrast material), and mammography for the diagnosis of breast cancer, with histopathologic or clinical follow-up results as the reference standard.This HIPAA-compliant pilot study had institutional review board approval; all subjects gave written

2007 Radiology

3087. CT in the evaluation of nontraumatic abdominal pain in pregnant women. (Abstract)

CT in the evaluation of nontraumatic abdominal pain in pregnant women. To retrospectively determine sensitivity and specificity of computed tomography (CT) for the diagnosis of appendicitis in pregnant women with nontraumatic abdominal pain and retrospectively compare findings at CT and ultrasonography (US) in patients who underwent both examinations, with surgery or clinical follow-up as a reference standard.Institutional review board approval was obtained, and the study was HIPAA compliant

2007 Radiology

3088. Bowel transition points: multiplicity and posterior location at CT are associated with small-bowel volvulus. (Abstract)

Bowel transition points: multiplicity and posterior location at CT are associated with small-bowel volvulus. To retrospectively evaluate the sensitivity and specificity of the number and location of bowel transition points at computed tomography (CT) in the diagnosis of small-bowel volvulus, with surgical findings as the reference standard.This HIPAA-compliant study had institutional review board approval; informed consent was waived. One hundred adult patients who had undergone preoperative CT

2007 Radiology

3089. Enhancing nonmass lesions in the breast: evaluation with proton (1H) MR spectroscopy. (Abstract)

Enhancing nonmass lesions in the breast: evaluation with proton (1H) MR spectroscopy. To prospectively evaluate the sensitivity and specificity of proton (hydrogen 1 [1H]) magnetic resonance (MR) spectroscopy for diagnosing malignant enhancing nonmass lesions identified at breast MR imaging, with histologic examination as the reference standard.In this HIPAA-compliant, institutional review board-approved study, in which all participants gave written informed consent, proton (1H) MR spectroscopy

2007 Radiology

3090. Evaluation of computer-aided detection systems in the detection of small invasive breast carcinoma. (Abstract)

Evaluation of computer-aided detection systems in the detection of small invasive breast carcinoma. To retrospectively compare two CAD systems for detecting invasive breast cancers manifesting as noncalcified masses smaller than 16 mm.Waiver of informed consent was granted by the Institutional Review Board that approved this HIPAA-compliant study. Mammograms obtained from two institutions providing consecutive invasive carcinomas manifesting as noncalcified masses smaller than 16 mm were

2007 Radiology

3091. Breast cancer detection rate: designing imaging trials to demonstrate improvements. (Abstract)

, and perform analytic studies. This study was HIPAA compliant. The authors estimated the distribution of individual radiologists' breast cancer detection rates for 2,289,132 screening mammograms (9030 cancers) read by 510 radiologists in the United States who participated in the Breast Cancer Surveillance Consortium from 1996 through 2002. They then computed the distributions of breast cancer detection rates expected from a trial of screening mammography and multiple radiologists, as well as similar

2007 Radiology

3092. Determining contrast medium dose and rate on basis of lean body weight: does this strategy improve patient-to-patient uniformity of hepatic enhancement during multi-detector row CT? (Abstract)

Determining contrast medium dose and rate on basis of lean body weight: does this strategy improve patient-to-patient uniformity of hepatic enhancement during multi-detector row CT? To prospectively evaluate the use of lean body weight (LBW) as the main determinant of the volume and rate of contrast material administration during multi-detector row computed tomography of the liver.This HIPAA-compliant study had institutional review board approval. All patients gave written informed consent

2007 Radiology

3093. Can high-attenuation renal cysts be differentiated from renal cell carcinoma at unenhanced CT? (Abstract)

Can high-attenuation renal cysts be differentiated from renal cell carcinoma at unenhanced CT? To retrospectively determine if renal cell carcinoma can be differentiated from high-attenuation renal cysts at unenhanced computed tomography (CT) based on Hounsfield unit measurements and heterogeneity.The Human Investigation Committee at our institution approved this study with waiver of informed consent. This study was compliant with the HIPAA. Fifty-four pathologically proved renal cell

2007 Radiology

3094. Suspected appendicitis in children: rectal and intravenous contrast-enhanced versus intravenous contrast-enhanced CT. (Abstract)

Suspected appendicitis in children: rectal and intravenous contrast-enhanced versus intravenous contrast-enhanced CT. To retrospectively compare the diagnostic performance of intravenous contrast material-enhanced computed tomography (CT) with that of intravenous and rectal contrast-enhanced CT in the evaluation of children suspected of having appendicitis by using pathologic findings, surgical findings, or a follow-up telephone call as the reference standard.This HIPAA-compliant study

2007 Radiology

3095. Intraaxial brain masses: MR imaging-based diagnostic strategy--initial experience. (Abstract)

Intraaxial brain masses: MR imaging-based diagnostic strategy--initial experience. To develop and retrospectively determine the accuracy of a magnetic resonance (MR) imaging strategy to differentiate intraaxial brain masses, with histologic findings or clinical diagnosis as the reference standard.The study was HIPAA compliant and was approved by the institutional review board. A waiver of informed consent was obtained. A strategy was developed on the basis of conventional MR imaging, diffusion

2007 Radiology

3096. Teniae coli-based circumferential localization system for CT colonography: feasibility study. (Abstract)

Teniae coli-based circumferential localization system for CT colonography: feasibility study. This HIPAA-compliant study, with institutional review board approval and informed patient consent, was conducted to retrospectively develop a teniae coli-based circumferential localization method for guiding virtual colon navigation and colonic polyp registration. Colonic surfaces (n = 72) were depicted at computed tomographic (CT) colonography performed in 36 patients (26 men, 10 women; age range, 47

2007 Radiology

3097. Influence of needle tip position on injectate spread in 406 interlaminar lumbar epidural steroid injections. (Abstract)

Influence of needle tip position on injectate spread in 406 interlaminar lumbar epidural steroid injections. To retrospectively evaluate flow patterns of interlaminar lumbar epidural steroid injections and compare these patterns to needle tip position.This study was approved by the institutional review board and complied with HIPAA guidelines. The requirement for informed consent was waived. Fluoroscopic images from 701 consecutive lumbar epidural steroid injections in 485 patients were

2007 Radiology

3098. Head and neck cancer: dedicated FDG PET/CT protocol for detection--phantom and initial clinical studies. (Abstract)

Head and neck cancer: dedicated FDG PET/CT protocol for detection--phantom and initial clinical studies. To retrospectively compare the sensitivity of a dedicated fluorine 18 fluorodeoxyglucose (FDG) positron emission tomography (PET)/computed tomography (CT) protocol versus a standard whole-body PET/CT protocol for detection of head and neck cancer, with biopsy and follow-up as reference standards.Institutional review board approval and informed consent were obtained for this HIPAA-compliant

2007 Radiology

3099. Does two-segment image reconstruction at 64-section CT coronary angiography improve image quality and diagnostic accuracy? Full Text available with Trip Pro

was HIPAA compliant. Forty consecutive patients (22 men, 18 women; mean age, 61 years +/- 8 [standard deviation]) underwent both 64-section multidetector CT coronary angiography and conventional angiography. All data sets were reconstructed by using single- and two-segment image reconstruction algorithms, with resulting temporal resolution of 82.5-165 msec. Two experienced observers independently evaluated image quality and signs of coronary artery disease. A five-level grading scheme was used to grade

2007 Radiology

3100. Breast MR imaging: computer-aided evaluation program for discriminating benign from malignant lesions. (Abstract)

Breast MR imaging: computer-aided evaluation program for discriminating benign from malignant lesions. To retrospectively determine the sensitivity of kinetic features measured with computer-aided evaluation at breast magnetic resonance (MR) imaging in discriminating benign from malignant lesions, with histopathologic findings used as the reference standard.Institutional review board approval was obtained for this HIPAA-compliant study. Informed consent was waived. Suspicious breast lesions

2007 Radiology

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