Muller, M.

bubble level study ultrasound pressure hormone estradiol decline transducer testosterone contrast measurement microbubble distribution diameter sex hormones frequency /liter agent non-shbg-e baseline non-shbg-t size distribution ratio endocrinol estrogen metab finity jong n shbg levels sizing method non-shbg-e 2 binding function sex hormone levels ultrasound contrast agent concentration netherland subject value table amplitude association nmol /l 25 mhz change focus population capillary factor measure relationship eugonadal men transfer function risk factors imaging model effect center estrogen /androgen ratio muller result body mass index range conversion backscattered nmol /liter bioavailable increase goertz plasma brain resonance e 2 levels sex hormone-binding globulin eugonadal hpg axis e 2/t ratio resonance frequency