Radioopaque material

Since there is direct proportionality between the iodine concentration within the tissue or vessel and X-ray attenuation, pharmacokinetic parameters can be calculated from time-density curves. In CT, 30 HU correspond to approximately 1 mg iodine g tissue [6]. This is a rather high local concentration of radioopaque material, thus underlining the relatively low sensitivity of CT that counterbalances its high specificity. 

Where p is the density of material, / and / the incident and trarrsrrritted intensities, and d is the thickness of the absorber (Singh et al., 2006). The prrrpose of the study was to determine the composition of the elastomers characterized by absorption properties of the X-ray radiation. Preparing radioopaque materials from natural robber (NR) containing differerrt fillers as active substances. 

Addition ad hoc of other materials to acrylic bone cement (antibiotics or radioopaque materials) may lessen the chances of operative success such additives can cause mechanical weakness of the polymerized material due to loss of homogeneity and increased water resorption. The mechanical properties of polymerized bone cement also probably change in the course of time. Specimens of acrylic bone cement recovered at later operations were found to be 50% weaker than fresh test specimens. These in vivo experiments do not run parallel to experience in vitro where no age-induced weakness was demonstrable. 

Fig. 2. (a) X-ray image of the bowels of an adult patient filled with F-octyl bromide (the bromine atom makes the compound radioopaque, hence clear on the radiograph). Courtesy Alliance Pharmaceutical Corporation (b) Lungs of an infant patient filled with the same material. From Ref. [17], with permission. 

Fig. 7.8. A 42-year-old man image obtained 7 days after simultaneous pancreas-kidney transplantation. Small bowel follow-through examination with water-soluble contrast material shows duodenojejunostomy (single arrow) and partly contrasted donor s duodenum (arrowheads). Contrast-filled small bowel loops and partially air-filled descending colon indirectly outline pancreas graft. Also seen are radioopaque cutaneous staples (double arrows) resulting from median laparotomy...

---