Abstract
Purpose: to determine the correlation between dose rate and T1 in blood at Gd-enhanced MR angiography (MRA)
Material and Methods: A test dose of contrast agent was used to calculate the time delay between injection and arrival in the abdominal aorta. the dose rate was expressed as ml · kg b.w.−1 · s−1. the correlation between dose rate and T1 was determined by varying the dose rate while keeping the scanning and infusion times constant. the signal intensity in the abdominal aorta was measured during the first pass of Gd and compared with markers of known T1 values
Results: A correlation between dose rate and T1 in blood was obtained
Conclusion: A Gd dose rate of 0.01 ml · kg b.w.−1 · s−1 gives a T1 in blood of 100 ms. This can be used to calculate the optimal pulse sequence for contrast-enhanced MRA
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