Session 12: PDF OnlyFRENZEL THOMAS PHD; KOLER, SUSANNE; BAUER, HANS PHD; NIEDBALLA, ULRICH PHD; WEINMANN, HANNS J. PHDInvestigative Radiology: June 1994 - p S220-S222 Buy Abstract Frenzel T, Koßlcr S, Bauer H, Niedballa U, Weinmann HJ. Noninvasive in vivo pH measurements using a fluorinated pH probe and fluorine-19 magnetic resonance spectroscopy. Invest Radiol 1994;29:S220–S222. © Lippincott-Raven Publishers.