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$Objective:$ Information on the metabolism of tissues in both healthy anddiseased states plays a significant role in the detection and understanding oftumors, neurodegenerative diseases, diabetes, and other metabolic disorders.Hyperpolarized carbon-13 magnetic resonance imaging ($^{13}$C-HPMRI) anddeuterium metabolic imaging ($^2$H-DMI) are two emerging X-nuclei used aspractical imaging tools to investigate tissue metabolism. However due to theirlow gyromagnetic ratios ($\gamma_{13C}$ = 10.7 MHz/T; $\gamma_{2H}$ = 6.5MHz/T) and natural abundance, such method required a sophisticated dual-tunedradiofrequency (RF) coil. $ Methods:$ Here, we report a dual-tuned coaxialtransmission line (CTL) RF coil agile for metabolite information operating at7T with independent tuning capability. The design analysis has demonstrated howboth resonant frequencies can be individually controlled by simply varying theconstituent of the design parameters. $Results:$ Numerical results havedemonstrated a broadband tuning range capability, covering most of theX-nucleus signal, especially the $^{13}$C and $^2$H spectra at 7T. Furthermore,in order to validate the feasibility of the proposed design, both dual-tuned$^1$H/$^{13}$C and $^1$H/$^2$H RF coils are fabricated using a semi-flexibleRG-405 .086" coaxial cable and bench test results (scattering parameters andmagnetic field efficiency/distribution) are successfully obtained.$Conclusion:$ The proposed dual-tuned RF coils reveal highly effective magneticfield obtained from both proton and heteronuclear signal which is crucial foraccurate and detailed imaging. $Significance:$ The successful development ofthis new dual-tuned RF coil technique would provide a tangible and efficienttool for ultrahigh field metabolic MR imaging.

Dual-tuned Coaxial-transmission-line RF coils for Hyperpolarized 13C and Deuterium 2H Metabolic MRS Imaging at Ultrahigh Fields