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“Purpose: To image thrombus by using magnetic resonance (MR) imaging and positron emission tomography (PET) simultaneously

in a rat arterial thrombus model with a dual PET/MR probe.

Materials and Methods: Animal studies were approved by the institutional animal use committee. A dual PET/MR probe was synthesized by means of partial exchange of gadolinium for copper signaling pathway 64 ((64)Cu) in the fibrin-targeted MR probe EP-2104R. A preformed 25-mm thrombus was injected into the right internal carotid artery of a rat. Imaging was performed with a clinical 3.0-T MR imager with an MR-compatible human PET imager. Rats (n = 5) were imaged prior to and after systemic administration of the dual probe by using simultaneous PET/MR. The organ distribution of (64)Cu and gadolinium was determined ex vivo (n = 8), 2 hours after injection by using well counting and inductively coupled plasma mass spectrometry, respectively. Signal intensity ratios (SIRs) between the thrombus-containing and contralateral vessel were computed from PET images and MR data before and after probe administration.

Results: The dual probe was synthesized with greater than 98% radiochemical purity. Thrombus enhancement this website was observed in all five animals at both MR (SIR([postprobe])/SIR([preprobe]) = 1.71 +/- 0.35, P = .0053) and PET (SIR = 1.85 +/- 0.48, P = .0087)

after injection of the dual PET/MR probe. Ex vivo analysis at 2 hours after injection showed the highest (64)Cu and gadolinium concentrations, after the excretory organs (kidney and liver), to be in the AS1842856 nmr thrombus.

Conclusion: A fibrin-targeted dual PET/MR probe enables simultaneous, direct MR and PET imaging of thrombus. (C)RSNA, 2010″
“Prediction models are becoming more and more important in medicine and cardiology. Nowadays, specific interest focuses on ways in which models can be improved using new prognostic markers. We aim to describe the similarities and differences between performance measures for prediction

models. We analyzed data from 3264 subjects to predict 10-year risk of coronary heart disease according to age, systolic blood pressure, diabetes, and smoking. We specifically study the incremental value of adding high-density lipoprotein cholesterol to this model.

We emphasize that we need to separate the evaluation of predictions, where traditional performance measures such as the area under the receiver operating characteristic curve and calibration are useful. from the evaluation of classifications, where various other statistics are now available, including the net reclassification index and net benefit.”
“Introduction and hypothesis The objective of the study was to characterize trends in lower reproductive tract fistula (LRTF) repair in inpatient US women from 1979 to 2006.