J.A. Helpern

1.7k total citations
30 papers, 1.4k citations indexed

About

J.A. Helpern is a scholar working on Radiology, Nuclear Medicine and Imaging, Molecular Biology and Cellular and Molecular Neuroscience. According to data from OpenAlex, J.A. Helpern has authored 30 papers receiving a total of 1.4k indexed citations (citations by other indexed papers that have themselves been cited), including 16 papers in Radiology, Nuclear Medicine and Imaging, 6 papers in Molecular Biology and 5 papers in Cellular and Molecular Neuroscience. Recurrent topics in J.A. Helpern's work include Advanced MRI Techniques and Applications (16 papers), Advanced Neuroimaging Techniques and Applications (8 papers) and MRI in cancer diagnosis (5 papers). J.A. Helpern is often cited by papers focused on Advanced MRI Techniques and Applications (16 papers), Advanced Neuroimaging Techniques and Applications (8 papers) and MRI in cancer diagnosis (5 papers). J.A. Helpern collaborates with scholars based in United States and United Kingdom. J.A. Helpern's co-authors include Michael Chopp, Roger J. Ordidge, Robert A. Knight, K.M.A. Welch, Steven R. Levine, Mary O. Dereski, Lonni Schultz, Nabih M. Ramadan, Herbert R. Halvorson and G D’Andrea and has published in prestigious journals such as Neurology, Stroke and Radiology.

In The Last Decade

J.A. Helpern

30 papers receiving 1.4k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
J.A. Helpern United States	16	719	302	212	209	204	30	1.4k
DG Gadian United Kingdom	13	1.1k 1.5×	370 1.2×	186 0.9×	170 0.8×	357 1.8×	30	2.1k
Allan R. Andersen Denmark	20	532 0.7×	688 2.3×	434 2.0×	233 1.1×	101 0.5×	30	1.8k
Gloria Chiang United States	24	511 0.7×	286 0.9×	253 1.2×	340 1.6×	162 0.8×	91	1.6k
Robert Dann United States	15	589 0.8×	163 0.5×	190 0.9×	142 0.7×	119 0.6×	30	1.3k
R. Tarducci Italy	17	443 0.6×	237 0.8×	187 0.9×	282 1.3×	214 1.0×	36	1.2k
Kimihiko Abe Japan	22	583 0.8×	407 1.3×	226 1.1×	343 1.6×	85 0.4×	62	1.5k
Heiss Wd Germany	18	420 0.6×	166 0.5×	416 2.0×	141 0.7×	167 0.8×	46	1.4k
Masaru Takasaki Japan	22	435 0.6×	323 1.1×	183 0.9×	563 2.7×	391 1.9×	80	1.8k
Masanori Ichise United States	23	556 0.8×	269 0.9×	423 2.0×	454 2.2×	503 2.5×	67	2.0k
D. Wyper United Kingdom	26	475 0.7×	338 1.1×	681 3.2×	236 1.1×	296 1.5×	59	1.9k

Countries citing papers authored by J.A. Helpern

Since Specialization

Citations

This map shows the geographic impact of J.A. Helpern'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 J.A. Helpern with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites J.A. Helpern more than expected).

Fields of papers citing papers by J.A. Helpern

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by J.A. Helpern. 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 J.A. Helpern. The network helps show where J.A. Helpern may publish in the future.

Co-authorship network of co-authors of J.A. Helpern

This figure shows the co-authorship network connecting the top 25 collaborators of J.A. Helpern. A scholar is included among the top collaborators of J.A. Helpern 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 J.A. Helpern. J.A. Helpern is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Helpern, J.A., et al.. (2003). Quantifying Non-Gaussian Water Diffusion by Means of Pulsed-Field-Gradient MRI. 24 indexed citations

Huang, Neng, Martin N. Yongbi, & J.A. Helpern. (1998). The influence of preischemic hyperglycemia on acute changes in brain water ADC following focal ischemia in rats. Brain Research. 788(1-2). 137–143. 11 indexed citations

Yongbi, Martin N., et al.. (1997). The influence of preischemic hyperglycemia on acute changes in the apparent diffusion coefficient of brain water following global ischemia in rats. Brain Research. 757(1). 139–145. 15 indexed citations

Yongbi, Martin N., Neng Huang, Craig A. Branch, & J.A. Helpern. (1997). The application of diffusion-weighted line-scanning for the rapid assessment of water ADC changes in stroke at high magnetic fields. NMR in Biomedicine. 10(2). 79–86. 11 indexed citations

Helpern, J.A., et al.. (1995). Preliminary observations of transverse relaxation rates obtained at 3 Tesla from the substantia nigra of adult normal human brain. NMR in Biomedicine. 8(1). 25–27. 4 indexed citations

Jiang, Quan, et al.. (1994). TEMPORAL EVOLUTION AND SPATIAL-DISTRIBUTION OF THE DIFFUSION CONSTANT OF WATER IN RAT-BRAIN AFTER TRANSIENT MIDDLE CEREBRAL-ARTERY OCCLUSION (VOL 120, PG 123, 1993). UCL Discovery (University College London). 6 indexed citations

Ordidge, Roger J., Robert A. Knight, J.A. Helpern, & James W. Hugg. (1994). A low flip angle spin-echo technique for producing rapid diffusion weighted MR images. Magnetic Resonance Imaging. 12(5). 727–731. 2 indexed citations

Helpern, J.A., et al.. (1993). Histopathological correlations of nuclear magnetic resonance imaging parameters in experimental cerebral ischemia. Magnetic Resonance Imaging. 11(2). 241–246. 85 indexed citations

Jiang, Quan, Michael Chopp, J.A. Helpern, et al.. (1993). Temporal evolution and spatial distribution of the diffusion constant of water in rat brain after transient middle cerebral artery occlusion. Journal of the Neurological Sciences. 120(2). 123–130. 74 indexed citations

10.

Levine, Steven R., J.A. Helpern, Kathleen M. Welch, et al.. (1992). Human focal cerebral ischemia: evaluation of brain pH and energy metabolism with P-31 NMR spectroscopy.. Radiology. 185(2). 537–544. 63 indexed citations

11.

Ordidge, Roger J., et al.. (1991). INVESTIGATION OF BRAIN ISCHEMIA IMAGING BY MR DIFFUSION. Stroke. 1 indexed citations

12.

Chopp, Michael, et al.. (1991). Chronic changes in brain Mg2+ concentration after forebrain ischemia in the rat. Metabolic Brain Disease. 6(4). 199–206. 19 indexed citations

13.

Ordidge, Roger J., Robert A. Knight, & J.A. Helpern. (1991). Magnetization transfer contrast (MTC) in FLASH MR imaging. Magnetic Resonance Imaging. 9(6). 889–893. 13 indexed citations

14.

Welch, K.M.A., Steve Levine, & J.A. Helpern. (1990). Pathophysiological correlates of cerebral ischemia the significance of cellular acid base shifts.. PubMed. 5(1). 21–31. 15 indexed citations

15.

Welch, K.M.A., Steven R. Levine, G D’Andrea, Lonni Schultz, & J.A. Helpern. (1989). Preliminary observations on brain energy metabolism in migraine studied by in vivo phosphorus 31 NMR spectroscopy. Neurology. 39(4). 538–538. 163 indexed citations

16.

Ramadan, Nabih M., et al.. (1989). Low Brain Magnesium in Migraine. Headache The Journal of Head and Face Pain. 29(7). 416–419. 177 indexed citations

17.

Welch, K.M.A., et al.. (1985). Biochemical Effects of Cerebral Ischemia: Relevance To Migraine. Cephalalgia. 5(2_suppl). 35–42. 6 indexed citations

18.

Chopp, Michael, J.A. Helpern, Stanley Frinak, et al.. (1985). In vivo 31‐P NMR of photoactivated hematoporphyrin derivative in cat brain. Medical Physics. 12(2). 256–258. 10 indexed citations

19.

Helpern, J.A., H. N. Sabbah, Paul D. Stein, et al.. (1984). Evaluation of intracellular pH and high energy phosphate metabolites in a model of regional myocardial ischemia in the cat. Magnetic Resonance Imaging. 2(3). 248–248. 1 indexed citations

20.

Chopp, Michael, J.A. Helpern, James R. Ewing, & K.M.A. Welch. (1984). Anoxia followed by hyperoxia: In vivo 31-P NMR of cat brain. Magnetic Resonance Imaging. 2(4). 329–333. 3 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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