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radiology dr walif chbeir walif chbeir medicine medical imaging health pno diagnosis pneumothorax healthcare medical mri walif chbeir radiology notes classification of stenosis figures brain normal labral variants doppler ultrasound arteries of lower extremeties ultrasonography doppler sonography duplex doppler sonography toe-brachial pressure index echography fetal measurements postexercise abi toe-brachial index ankle-brachial pressure index carol b.benson abi big data labral labrum risk factors treadmill testing cardiovascular risk toe-brchial index peripheral arterial disease ankle-brachial index screening test doppler of lower limb arteries stenosis power doppler sonography real-time gray-scale imaging interpretation and reporting color doppler sonography pulse repetition frequency scale normal laminar flow ultrasound contrast agent scanning technique grading of carotid artery stenosis grading stenosis peak systolic velocity velocity ratio brain ischemia dwi brain hemmorrhage flair radiology notes brain infarction t1gadolinium t1wi t2wi adc t2*gre stroke acute stroke acute hyperacute stroke polymicrogyria pachygyria blaise v. jones lissencephaly obstetric gestational age rumack radioloy pneumothroax collapsed lung lungs xray imaging medical papers images cerebral cavernous malformation popliteus tendon ligaments arcuate complex arcuate sign edema posterolateral corner of knee osseous avulsion from fibula moneta g l carotid artery grant e g benson c b anne kennedy