Temporal Assessment of Gadolinium Deposition and T1 Signal Intensity Changes in Rat Kidney with Single and Multiple Doses of Injection: An Experimental Study

Gadolinium deposition in biological tissues was first reported in patients with renal failure. We aimed to investigate gadolinium deposition in the rat kidney after exposure to single and multiple doses of gadolinium and evaluate deposition for 1- and 3-month periods. We also aimed to determine any correlation between the amount of deposition and T1-weighted image intensity. Seventy rats (5 animals per group) were included in the sample, and 9 groups received a single dose (0.3, 0.6, and 1.2 mmol/kg) of gadolinium, and 1 group for each dose was sacrificed at the end of the first day, week, and month. Four groups received weekly doses (0.3 and 0.6 mmol/kg) and were sacrificed at the end of 6 and 12 weeks. Measurement of T1 intensities was carried out with postinjection images before sacrifice, and deposition was determined using inductively coupled plasma mass spectrometry. The number of injections was associated with increased gadolinium deposition (P