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[en] This paper reports charge collection measured across the base-emitter heterojunction to test certain assumptions of the standard sensitive volume models for calculating SEU rates. The observed dependence of charge collection on the LET (linear energy transfer) and the angle of incidence of alphas and 20 MeV Oxygen ions is consistent with the hypothesis that the charge collected equals the product of LET and pathlength through a sensitive volume of fixed dimensions. The data suggest that the switch from MBE to MOCVD processing resulted in an increase in the thickness of the sensitive volume from 0.11 to 0.25 microns
[en] Aim: To evaluate the 3 T MR cholangiopancreatography (MRCP) appearances of biliary ascariasis. Materials and methods: Nine patients with a MRCP diagnosis of biliary ascariasis were reviewed. All patients had endoscopic retrograde cholangiopancreatography (ERCP) or surgical confirmation of the disease. Results: On thin-slab MRCP imaging, Ascaris worms are clearly demarcated within the biliary tree. All the identified worms demonstrated a characteristic three-parallel-lines appearance. The middle high-signal intensity line is sandwiched between two low-signal intensity lines and they are in turn surrounded by high signal bile. On thick-slab MRCP the worms also show the three-line sign but with less clarity. However, thick-slab MRCP has the advantage of providing three-dimensional ERCP-like images of the pancreaticobiliary system. Conclusion: The 'three-line' sign appears to be a characteristic sign of biliary ascariasis on 3 T MRCP.