Low-high and high-low biphasic injection forms in computed tomography examinations of the upper abdomen |
| |
Authors: | Martí-Bonmatí L Arana E Tobarra E Sierra C |
| |
Affiliation: | Department of Radiology, Clínica Quirón, Valencia, Spain. rmquironv.val@quiron.es |
| |
Abstract: | Purpose: To analyze the influence of different biphasic and monophasic injection rate protocols in abdominal computed tomography (CT).
Material and Methods: A randomized, consecutive, parallel group study was designed and conducted in 60 patients studied with the same CT helical protocol. Patients were randomly distributed into three groups: (A) monophasic (120 ml at 2.5 ml/s); (B) low-high biphasic (120 ml, first 60 ml at a rate of 2 ml/s, the other 60 ml at 2.5 ml/s); and (C) high-low biphasic (120 ml, first 60 ml at a rate of 2.5 ml/s, the other 60 ml at 2 ml/s). All patients were injected with 300 mg I/ml non-ionic contrast media at a fixed delay time of 55 s. Contrast enhancement efficacy was evaluated by attenuation coefficient measurements.
Results: Although non-significant, monophasic protocol enhancements were higher than biphasic protocol enhancements in all measurements except aortic bifurcation (p = 0.003). At this level, biphasic protocols obtained an increased mean enhancement from 7.6% to 2.5% compared to monophasic protocols.
Conclusion: Monophasic contrast agent injection in helical CT of the upper abdomen produces a higher enhancement of parenchymal and venous structures. No significant difference was observed between low-high and high-low biphasic protocols. |
| |
Keywords: | Computed tomography (CT) contrast enhancement computed tomography (CT) helical technology abdomen CT |
本文献已被 InformaWorld PubMed 等数据库收录! |
|