Which of the following is NOT a proper parameter for abdominal aortography?

The proper parameters for abdominal aortography are essential for ensuring optimal imaging and patient safety during the procedure. One key aspect of these parameters involves the injection rate of the contrast medium.

In abdominal aortography, the typical injection rate is generally higher than what is specified in the choice indicating 7 - 15 mL/sec for 2 - 4 seconds. In practice, an injection rate closer to or exceeding 10 mL/sec up to 20 mL/sec is often employed to ensure adequate visualization of the aorta and any branches during the study. The duration of injection is also crucial, as too slow of an injection may not provide the necessary contrast enhancement.

Therefore, the choice that describes the injection rate and duration does not align with the standard parameters for abdominal aortography, making it the correct answer to the question. The other parameters listed, such as catheter type and positioning, as well as the iodine concentration for contrast, align closely with established protocols used during this procedure, ensuring effective imaging while maintaining patient safety and comfort.