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2015 ; 10
(6
): 446-55
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A comparison of iopromide and iopamidol, two acidoCEST MRI contrast media that
measure tumor extracellular pH
#MMPMID26108564
Moon BF
; Jones KM
; Chen LQ
; Liu P
; Randtke EA
; Howison CM
; Pagel MD
Contrast Media Mol Imaging
2015[Nov]; 10
(6
): 446-55
PMID26108564
show ga
Acidosis within tumor and kidney tissues has previously been quantitatively
measured using a molecular imaging technique known as acidoCEST MRI. The previous
studies used iopromide and iopamidol, two iodinated contrast agents that are
approved for clinical CT diagnoses and have been repurposed for acidoCEST MRI
studies. We aimed to compare the performance of the two agents for measuring pH
by optimizing image acquisition conditions, correlating pH with a ratio of CEST
effects from an agent, and evaluating the effects of concentration, endogenous T1
relaxation time and temperature on the pH-CEST ratio correlation for each agent.
These results showed that the two agents had similar performance characteristics,
although iopromide produced a pH measurement with a higher dynamic range while
iopamidol produced a more precise pH measurement. We then compared the
performance of the two agents to measure in vivo extracellular pH (pHe) within
xenograft tumor models of Raji lymphoma and MCF-7 breast cancer. Our results
showed that the pHe values measured with each agent were not significantly
different. Also, iopromide consistently measured a greater region of the tumor
relative to iopamidol in both tumor models. Therefore, an iodinated contrast
agent for acidoCEST MRI should be selected based on the measurement properties
needed for a specific biomedical study and the pharmacokinetic properties of a
specific tumor model.