Leak detection false leaks

Automatic tank gauging equipment may be used if it can detect a leak of two-tenths (0.2) of a gallon per hour or larger with a probability of detection of 95% and probability of false alarm of 5% or less. Monitoring must be carried out once per week or... 

This system is ideal for thermoformed trays with porous lids and flexible pouches with one porous side. The test has been shown to detect leaks as small as 0.002 in. Guidmt and Medtronic have demonstrated the reliability of detecting leaks in blind tests and have quantified 100 percent of the purposely manufactured leaks in thermoformed trays (Hacked, 1996). In addition, there were no false positive readings in any of the unaltered packages. 

MRCP is helpful in the detection of biliary strictures, bile leaks, and biloma formation. Thick-slab MRCP images are particularly useful in the presence of biliary dilatation (Fig. 4.2.25). However, proximal biliary dilatation may be absent in the transplanted patient with stenosis at the anastomotic site (Laghi et al. 1999 Pandharipande et al. 2001). Careful analysis of thin-slice MR images can help to identify the stricture and/or leak (Fig. 4.2.26). False MR positive and negative results may occur in the presence of surgical clips due to susceptibility artifact obscuring the biliary ducts. 

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