James Ratnakar

625 total citations
16 papers, 484 citations indexed

About

James Ratnakar is a scholar working on Radiology, Nuclear Medicine and Imaging, Spectroscopy and Materials Chemistry. According to data from OpenAlex, James Ratnakar has authored 16 papers receiving a total of 484 indexed citations (citations by other indexed papers that have themselves been cited), including 11 papers in Radiology, Nuclear Medicine and Imaging, 9 papers in Spectroscopy and 8 papers in Materials Chemistry. Recurrent topics in James Ratnakar's work include Advanced MRI Techniques and Applications (10 papers), Advanced NMR Techniques and Applications (8 papers) and Lanthanide and Transition Metal Complexes (7 papers). James Ratnakar is often cited by papers focused on Advanced MRI Techniques and Applications (10 papers), Advanced NMR Techniques and Applications (8 papers) and Lanthanide and Transition Metal Complexes (7 papers). James Ratnakar collaborates with scholars based in United States, Spain and Germany. James Ratnakar's co-authors include A. Dean Sherry, Angelo Josue M. Lubag, Zoltán Kovács, W. Thomas Dixon, Ileana Hancu, Robert E. Lenkinski, Jimin Ren, Elena Vinogradov, N. Quyen and Luis M. De Leon Rodriguez and has published in prestigious journals such as Journal of the American Chemical Society, Analytical Biochemistry and Radiology.

In The Last Decade

James Ratnakar

15 papers receiving 483 citations

Peers

James Ratnakar

RNMI

BIOPH

SPECT

EOMM

Vipul Sheth United States

Armando Mortillaro Italy

Edward A. Randtke United States

Liu Qi Chen United States

Massimo Visigalli Italy

Veronica Clavijo Jordan United States

Amandine Roux France

Hyla Allouche‐Arnon Israel

Normand J. Cloutier United States

Ian Ramsay United States

Vipul Sheth United States

James Ratnakar

316 ×0.9

420 ×1.6

RNMI

126 ×1.0

BIOPH

58 ×0.5

SPECT

71 ×0.8

EOMM

Citations per year, relative to James Ratnakar James Ratnakar (= 1×) peers Vipul Sheth

Countries citing papers authored by James Ratnakar

Since Specialization

Citations

This map shows the geographic impact of James Ratnakar's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by James Ratnakar with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites James Ratnakar more than expected).

Fields of papers citing papers by James Ratnakar

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by James Ratnakar. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by James Ratnakar. The network helps show where James Ratnakar may publish in the future.

Co-authorship network of co-authors of James Ratnakar

This figure shows the co-authorship network connecting the top 25 collaborators of James Ratnakar. A scholar is included among the top collaborators of James Ratnakar based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with James Ratnakar. James Ratnakar is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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16 of 16 papers shown

Suh, Eul Hyun, et al.. (2022). Dissolution Dynamic Nuclear Polarization of the ⁷⁷Se Nucleus. Analysis & Sensing. 3(2). 2 indexed citations

Ma, Junjie, Marco C. Pinho, Crystal Harrison, et al.. (2021). Dynamic ¹³C MR spectroscopy as an alternative to imaging for assessing cerebral metabolism using hyperpolarized pyruvate in humans. Magnetic Resonance in Medicine. 87(3). 1136–1149. 6 indexed citations

Park, Jae Mo, Crystal Harrison, Junjie Ma, et al.. (2021). Hyperpolarized ¹³C MR Spectroscopy Depicts in Vivo Effect of Exercise on Pyruvate Metabolism in Human Skeletal Muscle. Radiology. 300(3). 626–632. 13 indexed citations

Ma, Junjie, Jun Chen, Galen D. Reed, et al.. (2021). Cardiac measurement of hyperpolarized ¹³C metabolites using metabolite‐selective multi‐echo spiral imaging. Magnetic Resonance in Medicine. 86(3). 1494–1504. 14 indexed citations

Ma, Junjie, Craig R. Malloy, Crystal Harrison, et al.. (2021). Dual‐phase imaging of cardiac metabolism using hyperpolarized pyruvate. Magnetic Resonance in Medicine. 87(1). 302–311. 5 indexed citations

Niedbalski, Peter, et al.. (2020). Hyperpolarized 89Y-EDTMP complex as a chemical shift-based NMR sensor for pH at the physiological range. Journal of Magnetic Resonance. 320. 106837–106837. 7 indexed citations

Yang, Limin, Hui Zheng, James Ratnakar, et al.. (2018). Engineering a pH‐Sensitive Liposomal MRI Agent by Modification of a Bacterial Channel. Small. 14(19). e1704256–e1704256. 17 indexed citations

Mulik, Rohit S., Hui Zheng, Kumar Pichumani, et al.. (2017). Elucidating the structural organization of a novel low-density lipoprotein nanoparticle reconstituted with docosahexaenoic acid. Chemistry and Physics of Lipids. 204. 65–75. 5 indexed citations

Pichumani, Kumar, Tomoyuki Mashimo, Vamsidhara Vemireddy, et al.. (2016). Hepatic gluconeogenesis influences 13C enrichment in lactate in human brain tumors during metabolism of [1,2-13C]acetate. Neurochemistry International. 97. 133–136. 5 indexed citations

10.

Pichumani, Kumar, Tomoyuki Mashimo, Hyeon-Man Baek, et al.. (2015). Conditions for 13C NMR detection of 2-hydroxyglutarate in tissue extracts from isocitrate dehydrogenase-mutated gliomas. Analytical Biochemistry. 481. 4–6. 8 indexed citations

11.

Soesbe, Todd C., Yunkou Wu, James Ratnakar, et al.. (2015). Using T2-Exchange from Ln3+DOTA-Based Chelates for Contrast-Enhanced Molecular Imaging of Prostate Cancer with MRI.

12.

Quyen, N., James Ratnakar, Zoltán Kovács, & A. Dean Sherry. (2014). Redox‐ and Hypoxia‐Responsive MRI Contrast Agents. ChemMedChem. 9(6). 1116–1129. 74 indexed citations

13.

Lin, Chien‐Yuan, Nirbhay N. Yadav, James Ratnakar, A. Dean Sherry, & Peter C.M. van Zijl. (2013). In vivo imaging of paraCEST agents using frequency labeled exchange transfer MRI. Magnetic Resonance in Medicine. 71(1). 286–293. 6 indexed citations

14.

Lin, Chien‐Yuan, Nirbhay N. Yadav, Joshua I. Friedman, et al.. (2012). Using frequency‐labeled exchange transfer to separate out conventional magnetization transfer effects from exchange transfer effects when detecting ParaCEST agents. Magnetic Resonance in Medicine. 67(4). 906–911. 19 indexed citations

15.

Dixon, W. Thomas, Jimin Ren, Angelo Josue M. Lubag, et al.. (2010). A concentration-independent method to measure exchange rates in PARACEST agents. Magnetic Resonance in Medicine. 63(3). 625–632. 167 indexed citations

16.

Ratnakar, James, et al.. (2009). A New Gadolinium-Based MRI Zinc Sensor. Journal of the American Chemical Society. 131(32). 11387–11391. 136 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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