Comparison of Rhenium and Iodine as Contrast Agents in X-Ray Imaging

Figure 10

Evaluation of the contrast-to-noise ratio in digital radiography. The concentration of rhenium and iodine in the XCA was 200 mM. The XCA were imaged by digital radiography using a clinical X-ray camera (Multix X-ray, Siemens AG; Munich, Germany). The scans correspond to X12 to X23 and X26 to X29 (see Table 3). The images from exposures X24 and X25 were excluded from the analysis due to lack of contrast. As a consequence of the use of insufficient additional filtration in these two scans, the detector was saturated with photons when the current was 1.25 mA, which is the lowest current that can be selected in the instrument.