Medical Specialties Commons^™

Cardiac Risk Factors And Risk Scores Vs Cardiac Computed Tomography Angiography: A Prospective Cohort Study For Triage Of Ed Patients With Acute Chest Pain., Ethan J Halpern, Jacob P Deutsch, Maria M Hannaway, Adrian T Estepa, Anand S Kenia, Kenneth J Neuburger, David C Levin

Department of Radiology Faculty Papers

OBJECTIVE: The objective of the study is to evaluate cardiac risk factors and risk scores for prediction of coronary artery disease (CAD) and adverse outcomes in an emergency department (ED) population judged to be at low to intermediate risk for acute coronary syndrome.

METHODS: Informed consent was obtained from consecutive ED patients who presented with chest pain and were evaluated with coronary computed tomography angiography (cCTA). Cardiac risk factors, clinical presentation, electrocardiogram, and laboratory studies were recorded; the Thrombolysis in Myocardial Infarction (TIMI) and Global Registry of Acute Coronary Events (GRACE) scores were tabulated. Coronary computed tomography angiography findings were …

Assessment Of Subacromial Space And Its Relationship With Scapular Upward Rotation In College Baseball Players., Stephen John Thomas, Charles Buz Swanik, Thomas W Kaminski, Jill S Higginson, Kathleen A Swanik, Levon N Nazarian

Department of Radiology Faculty Papers

CONTEXT: Subacromial impingement is a common injury in baseball players and has been linked to a reduction in the subacromial space. In addition, it has been suggested that decreases in scapular upward rotation will lead to decreases in the subacromial space and ultimately impingement syndrome.

OBJECTIVE: The objective of this study was to evaluate the relationship between acromiohumeral distance and scapular upward rotation in healthy college baseball players.

DESIGN: Posttest-only study design.

SETTING: Controlled laboratory setting.

PARTICIPANTS: 24 healthy college baseball players. Intervention: Participants were measured for all dependent variables at preseason.

MAIN OUTCOME MEASURES: Acromiohumeral distance at rest and …

Body Mri Artifacts In Clinical Practice: A Physicist's And Radiologist's Perspective., Martin J Graves, Donald Mitchell

Department of Radiology Faculty Papers

The high information content of MRI exams brings with it unintended effects, which we call artifacts. The purpose of this review is to promote understanding of these artifacts, so they can be prevented or properly interpreted to optimize diagnostic effectiveness. We begin by addressing static magnetic field uniformity, which is essential for many techniques, such as fat saturation. Eddy currents, resulting from imperfect gradient pulses, are especially problematic for new techniques that depend on high performance gradient switching. Nonuniformity of the transmit radiofrequency system constitutes another source of artifacts, which are increasingly important as magnetic field strength increases. Defects in …

Assessment Of Early Tumor Response To Cytotoxic Chemotherapy With Dynamic Contrast-Enhanced Ultrasound In Human Breast Cancer Xenografts., Jian-Wei Wang, Wei Zheng, Ji-Bin Liu, Yao Chen, Long-Hui Cao, Rong-Zhen Luo, An-Hua Li, Jian-Hua Zhou

Department of Radiology Faculty Papers

There is a strong need to assess early tumor response to chemotherapy in order to avoid adverse effects from unnecessary chemotherapy and allow early transition to second-line therapy. This study was to quantify tumor perfusion changes with dynamic contrast-enhanced ultrasound (CEUS) in the evaluation of early tumor response to cytotoxic chemotherapy. Sixty nude mice bearing with MCF-7 breast cancer were administrated with either adriamycin or sterile saline. CEUS was performed on days 0, 2, 4 and 6 of the treatment, in which time-signal intensity (SI) curves were obtained from the intratumoral and depth-matched liver parenchyma. Four perfusion parameters including peak …