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Specific enhancement of intra-abdominal abscesses with perfluoroctylbromide for CT imaging
Abstract:
Perfluoroctylbromide (PFOB), a radiopaque reticuloendothelial system contrast media for computed tomography, has been shown to accumulate in macrophages. In the current study PFOB was tested in rabbits as an abscess imaging agent. Two abscesses were induced in each of 24 rabbits, one in the liver and the other in the peritoneal cavity. CT of the rabbit abdomen was performed four days later, two days after the administration of 5 gm/Kg of PFOB to 12 of these rabbits. The average enhancement of the wall of liver abscesses was by 140 Hounsfield units (HU) relative to the enhanced liver and peritoneal abscesses by 135 HU relative to the control group. This enhancement was secondary to the intense accumulation of PFOB filled macrophages in the abscess wall. In those rabbits where the liver abscess ruptured, the edges of the peritoneal collections enhanced by 147 HU. Regions of inflammation prior to liquifaction enhanced considerably. These areas could not be detected in the animals not receiving PFOB. Though the liquified center of liver abscesses could be seen in the absence of PFOB, none of the peritoneal abscesses could be detected in the animals not receiving PFOB. In contradistinction, all peritoneal abscesses enhanced considerably following PFOB allowing their prospective localization. In conclusion, PFOB accumulates in abscess walls and areas of inflammation producing marked CT enhancement of liver and peritoneal abscess collections. This enhancement allowed the differentiation of peritoneal abscess collections from adjacent bowel.
Insights
Perfluoroctylbromide (PFOB) effectively images liver and peritoneal abscesses in rabbits by accumulating in macrophages within abscess walls. This contrast agent significantly enhances CT visibility, aiding in abscess detection and differentiation from surrounding tissues.
Area of Science:
- Radiology
- Medical Imaging
- Contrast Media Research
Background:
- Perfluoroctylbromide (PFOB) is a radiopaque contrast agent known to accumulate in macrophages.
- Its potential as an abscess imaging agent requires further investigation.
Purpose of the Study:
- To evaluate Perfluoroctylbromide (PFOB) as a computed tomography (CT) imaging agent for liver and peritoneal abscesses in a rabbit model.
- To assess the enhancement characteristics and diagnostic utility of PFOB in abscess detection.
Main Methods:
- Twenty-four rabbits underwent induction of liver and peritoneal abscesses.
- Twelve rabbits received 5 gm/Kg of PFOB, while the control group did not.
- Abdominal CT scans were performed to evaluate abscess enhancement.
Main Results:
- PFOB administration resulted in significant CT enhancement of liver abscess walls (140 HU) and peritoneal abscesses (135 HU).
- Enhanced accumulation of PFOB-filled macrophages was observed in abscess walls and inflamed regions.
- PFOB enabled the detection and localization of peritoneal abscesses, which were not visible without the contrast agent.
- Differentiation of peritoneal abscesses from adjacent bowel was achieved using PFOB.
Conclusions:
- Perfluoroctylbromide (PFOB) accumulates in abscess walls and inflamed tissues, leading to marked CT enhancement.
- PFOB serves as a valuable imaging agent for detecting and characterizing liver and peritoneal abscesses.
- The contrast enhancement provided by PFOB improves the diagnostic accuracy in identifying abscess collections and distinguishing them from normal anatomy.