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<body class='hmmessage'><div dir='ltr'>Hi Gaters,<br>I'm doing simulations to improve phantom quality image of PET. <br>And now I have to calculate contrasts for spheres cold and hot and atenuation of lung, according NEMA.<br>Has someone calculated it?<br><br>Thanks in advance,<br><br>Lorena<br> </div></body>
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