Contrast the differences between the sulfur colloid scan and the tagged RBC scan for detecting GI bleeding A 99m Tc sulfur colloid scan can be started immediately when the patient arrives in the nuclear medicine department because the agent can be prepared ahead of time. The sulfur colloid remains in the intravascular space for approximately 25 minutes. …
How is biliary atresia differentiated from neonatal hepatitis on hepatobiliary scintigraphy? In both disorders, the bilirubin level is extremely high, making adequate visualization of radiotracer activity entering into the small bowel difficult to assess. During the initial hour of imaging, radiotracer activity is usually seen in the liver with persistent cardiac blood pool activity. Delayed …
What are the typical findings of a positive gastrointestinal bleeding scan? A positive GI bleeding scan generally requires that there be a focus of growing radiotracer activity that moves through the bowel. A focus that only increases in radiotracer activity can sometimes be a false-positive finding and attributable to renal activity, bowel hyperemia, or a …
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Possible sites of a biliary leak When a biliary leak occurs, where are the possible sites to observe the leak? A biliary leak can occur anywhere along the biliary tree. However, such leaks usually occur in areas of prior surgical intervention or anastomoses. When performing a hepatobiliary scan to assess for a biliary leak, it …
What is the Rim sign in radiology, and what does it imply? The “rim” sign refers to an area of increased radiotracer activity in the region of the liver surrounding the gallbladder. The implication is that there is hyperemia or inflammation associated with acute cholecystitis. This hyperemia appears as a rim of increased radiotracer activity …
Causes of false negative hepatobiliary scan resulting in the setting of acute cholecystitis There are several reasons why the gallbladder, or a structure appearing to be the gallbladder, can be observed on a hepatobiliary scan in the presence of acute cholecystitis. False-negative results occur most commonly when the patient has acute acalculous cholecystitis. Several other …
What functions of the hepatobiliary system can be evaluated using iminodiacetic acid radiotracers? Hepatocellular function can be evaluated using radiolabeled IDA radiotracers such as 99m Tc mebrofenin or 99m Tc HIDA to perform hepatobiliary scintigraphy, because radiotracer uptake by the liver depends on overall function. If the radiotracer activity in the cardiac blood pool disappears within 5 minutes, hepatocellular …