A.P. Callahan

926 total citations
36 papers, 689 citations indexed

About

A.P. Callahan is a scholar working on Radiology, Nuclear Medicine and Imaging, Organic Chemistry and Radiation. According to data from OpenAlex, A.P. Callahan has authored 36 papers receiving a total of 689 indexed citations (citations by other indexed papers that have themselves been cited), including 22 papers in Radiology, Nuclear Medicine and Imaging, 7 papers in Organic Chemistry and 5 papers in Radiation. Recurrent topics in A.P. Callahan's work include Radiopharmaceutical Chemistry and Applications (16 papers), Medical Imaging Techniques and Applications (9 papers) and Cardiac Imaging and Diagnostics (6 papers). A.P. Callahan is often cited by papers focused on Radiopharmaceutical Chemistry and Applications (16 papers), Medical Imaging Techniques and Applications (9 papers) and Cardiac Imaging and Diagnostics (6 papers). A.P. Callahan collaborates with scholars based in United States, Belgium and Germany. A.P. Callahan's co-authors include Furn F. Knapp, F.F. Knapp, Mark M. Goodman, F. F. Knapp, Gilbert Kirsch, Saed Mirzadeh, A.L. Beets, L. A. Ferren, B.T. Hsieh and Lee C. Washburn and has published in prestigious journals such as Journal of Medicinal Chemistry, European Journal of Nuclear Medicine and Molecular Imaging and Applied Radiation and Isotopes.

In The Last Decade

A.P. Callahan

35 papers receiving 657 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
A.P. Callahan United States 16 429 145 90 82 75 36 689
F. Brady United Kingdom 16 353 0.8× 154 1.1× 90 1.0× 81 1.0× 28 0.4× 39 732
Karen D. McElvany United States 16 692 1.6× 185 1.3× 175 1.9× 75 0.9× 93 1.2× 28 992
Lee C. Washburn United States 18 427 1.0× 153 1.1× 145 1.6× 90 1.1× 18 0.2× 47 793
C.J. Mathias United States 12 465 1.1× 129 0.9× 143 1.6× 52 0.6× 24 0.3× 25 821
Masao Tada Japan 17 307 0.7× 217 1.5× 158 1.8× 173 2.1× 11 0.1× 72 847
Ravi S. Harapanhalli United States 16 190 0.4× 410 2.8× 151 1.7× 127 1.5× 33 0.4× 27 1.1k
D.W. McPherson United States 15 186 0.4× 246 1.7× 42 0.5× 92 1.1× 43 0.6× 44 623
W.C. Eckelman United States 12 193 0.4× 174 1.2× 49 0.5× 58 0.7× 26 0.3× 24 429
R.S. Tilbury United States 15 551 1.3× 71 0.5× 178 2.0× 18 0.2× 10 0.1× 39 846
Stephen B. Haber United States 11 262 0.6× 85 0.6× 65 0.7× 151 1.8× 67 0.9× 15 484

Countries citing papers authored by A.P. Callahan

Since Specialization
Citations

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

Fields of papers citing papers by A.P. Callahan

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of A.P. Callahan

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

All Works

20 of 20 papers shown
1.
Kropp, J., F.F. Knapp, K.R. Ambrose, et al.. (1994). Evaluation of pancreatic lipase activity by simple urine analysis after oral administration of a new iodine-131-labeled triglyceride. European Journal of Nuclear Medicine and Molecular Imaging. 21(11). 1227–1230. 2 indexed citations
2.
3.
Singh, Jaspal, et al.. (1993). Studies on the preparation and isomeric composition of 186Re- and 188Re-pentavalent rhenium dimercaptosuccinic acid complex. Nuclear Medicine Communications. 14(3). 197–203. 53 indexed citations
4.
Knapp, F. F., J. Kropp, D.W. McPherson, et al.. (1993). Site-specific/stable radioiodination of 1,2-Pal-3-IPPA: an agent for the potential clinical evaluation of pancreatic insufficiency by urine analysis.. PubMed. 34(6). 946–52. 2 indexed citations
5.
Srivastava, Prem C., F. F. Knapp, A.P. Callahan, & Barry Goldstein. (1990). Myocardial imaging agents: Synthesis, characterization and evaluation of [(Z) and (Z,E)‐(1‐[82br]bromo‐1‐penten‐5‐yl)]triphenylphosphonium cations. Journal of Labelled Compounds and Radiopharmaceuticals. 28(10). 1161–1169. 2 indexed citations
6.
Brihaye, C., et al.. (1989). Reactor production and purification of osmium-191 for use in a new 191Os/191mIr radionuclide generator system. International Journal of Radiation Applications and Instrumentation Part A Applied Radiation and Isotopes. 40(2). 183–191. 5 indexed citations
7.
Ambrose, K.R., et al.. (1988). Effects of fasting on the myocardial subcellular distribution and lipid distribution of terminal p-iodophenyl-substituted fatty acids in rats. International Journal of Radiation Applications and Instrumentation Part B Nuclear Medicine and Biology. 15(6). 695–700. 9 indexed citations
8.
Srivastava, Prem C., et al.. (1983). Potential cerebral perfusion agents: synthesis and evaluation of a radioiodinated vinylalkylbarbituric acid analog. Journal of Medicinal Chemistry. 26(5). 742–746. 23 indexed citations
9.
Knapp, F.F., Mark M. Goodman, A.P. Callahan, et al.. (1983). New myocardial imaging agents: stabilization of radioiodine as a terminal vinyl iodide moiety on tellurium fatty acids. Journal of Medicinal Chemistry. 26(9). 1293–1300. 29 indexed citations
10.
GOODMAN, M. M., F.F. Knapp, A.P. Callahan, & L. A. Ferren. (1982). Synthesis and biological evaluation of 17-[131I]iodo-9-telluraheptadecanoic acid, a potential myocardial imaging agent. Journal of Medicinal Chemistry. 25(6). 613–618. 20 indexed citations
11.
Washburn, Lee C., et al.. (1982). Production of L-[1-11C]valine by HPLC resolution.. PubMed. 23(1). 29–33. 27 indexed citations
12.
Jay, Mandy, George A. Digenis, James E. Chaney, et al.. (1981). Synthesis and brain uptake of carbon-11 phenethylamine. Journal of Labelled Compounds and Radiopharmaceuticals. 18. 237. 1 indexed citations
13.
Digenis, George A., et al.. (1981). Preparation and preliminary tissue studies of optically active 11C-d- and l-phenylalanine. The International Journal of Applied Radiation and Isotopes. 32(5). 325–330. 26 indexed citations
14.
Knapp, Furn F., K.R. Ambrose, & A.P. Callahan. (1981). Potential pancreatic imaging agents. Tellurium-123m labeled-DL-.alpha.-amino-.gamma.-(phenyltelluro)butyric acid. Journal of Medicinal Chemistry. 24(7). 794–797. 4 indexed citations
15.
Knapp, Furn F., et al.. (1980). The effect of structural modifications on the adrenal uptake of steroids labeled in the side chain with tellurium-123m.. PubMed. 21(3). 258–63. 4 indexed citations
16.
Woo, David, et al.. (1980). Radiation dosimetry of two new tellurium- 123m-labeled adrenal-imaging agents: concise communication.. PubMed. 21(5). 454–8.
17.
Washburn, Lee C., et al.. (1979). High-level production of C-11-carboxyl-labeled amino acids. 2 indexed citations
18.
Knapp, F. F., et al.. (1979). Tellurium-123m-labeled isosteres of palmitoleic and oleic acids show high myocardial uptake. University of North Texas Digital Library (University of North Texas). 3 indexed citations
19.
Brown, L.C. & A.P. Callahan. (1975). The large-scale production of carrier-free 206Bi for medical application. The International Journal of Applied Radiation and Isotopes. 26(4). 213–217. 7 indexed citations
20.
Brown, L.C., et al.. (1973). High-yield zinc-68 cyclotron targets for carrier-free gallium-67 production. The International Journal of Applied Radiation and Isotopes. 24(11). 651–655. 12 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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