Roelf Valkema

10.5k total citations
168 papers, 7.2k citations indexed

About

Roelf Valkema is a scholar working on Radiology, Nuclear Medicine and Imaging, Epidemiology and Oncology. According to data from OpenAlex, Roelf Valkema has authored 168 papers receiving a total of 7.2k indexed citations (citations by other indexed papers that have themselves been cited), including 100 papers in Radiology, Nuclear Medicine and Imaging, 57 papers in Epidemiology and 50 papers in Oncology. Recurrent topics in Roelf Valkema's work include Cardiac Imaging and Diagnostics (58 papers), Neuroendocrine Tumor Research Advances (52 papers) and Lung Cancer Research Studies (40 papers). Roelf Valkema is often cited by papers focused on Cardiac Imaging and Diagnostics (58 papers), Neuroendocrine Tumor Research Advances (52 papers) and Lung Cancer Research Studies (40 papers). Roelf Valkema collaborates with scholars based in Netherlands, United States and Belgium. Roelf Valkema's co-authors include Eric P. Krenning, Dik J. Kwekkeboom, Marion de Jong, P.P.M. Kooij, Larry K. Kvols, Stanislas Pauwels, Wout A. P. Breeman, François Jamar, Willem H. Bakker and Wouter W. de Herder and has published in prestigious journals such as Circulation, Journal of Clinical Oncology and Accounts of Chemical Research.

In The Last Decade

Roelf Valkema

165 papers receiving 6.9k citations

Peers

Roelf Valkema
Damian Wild Switzerland
Alexander Haug Austria
Constantin Lapa Germany
Jan Mueller‐Brand Switzerland
Wout A. P. Breeman Netherlands
Jan Müller‐Brand Switzerland
Anders Sundin Sweden
P.P.M. Kooij Netherlands
Giuseppe Minniti Italy
Maria Werner‐Wasik United States
Damian Wild Switzerland
Roelf Valkema
Citations per year, relative to Roelf Valkema Roelf Valkema (= 1×) peers Damian Wild

Countries citing papers authored by Roelf Valkema

Since Specialization
Citations

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

Fields of papers citing papers by Roelf Valkema

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Roelf Valkema. 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 Roelf Valkema. The network helps show where Roelf Valkema may publish in the future.

Co-authorship network of co-authors of Roelf Valkema

This figure shows the co-authorship network connecting the top 25 collaborators of Roelf Valkema. A scholar is included among the top collaborators of Roelf Valkema 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 Roelf Valkema. Roelf Valkema 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.
Sluis, Pieter C. van der, Bianca Mostert, Joost J. Nuyttens, et al.. (2024). Adjuvant Therapy for Patients with a Tumor-Positive Resection Margin After Neoadjuvant Chemoradiotherapy and Esophagectomy. Annals of Surgical Oncology. 31(6). 3813–3818. 1 indexed citations
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Beukinga, Roelof J., Avishek Chatterjee, Henry C. Woodruff, et al.. (2023). External validation of 18F-FDG PET-based radiomic models on identification of residual oesophageal cancer after neoadjuvant chemoradiotherapy. Nuclear Medicine Communications. 44(8). 709–718. 1 indexed citations
4.
Valkema, Roelf, et al.. (2016). Ischemia burden on stress SPECT MPI predicts long-term outcomes after revascularization in stable coronary artery disease. Journal of Nuclear Cardiology. 25(3). 958–966. 5 indexed citations
5.
Walrand, Stéphan, Glenn Flux, Mark Konijnenberg, et al.. (2011). Dosimetry of yttrium-labelled radiopharmaceuticals for internal therapy: 86Y or 90Y imaging?. European Journal of Nuclear Medicine and Molecular Imaging. 38(S1). 57–68. 53 indexed citations
6.
Elhendy, Abdou, Arend F. L. Schinkel, Ron T. van Domburg, et al.. (2006). Prognostic stratification of obese patients by stress 99mTc-tetrofosmin myocardial perfusion imaging.. PubMed. 47(8). 1302–6. 15 indexed citations
7.
Elhendy, Abdou, Arend F. L. Schinkel, Jeroen J. Bax, et al.. (2005). Association of ischemia on stress (99m)Tc-tetrofosmin myocardial perfusion imaging with all-cause mortality in patients with diabetes mellitus.. PubMed. 46(10). 1589–95. 11 indexed citations
8.
Schinkel, Arend F. L., Abdou Elhendy, Elena Biagini, et al.. (2005). Prognostic stratification using dobutamine stress 99mTc-tetrofosmin myocardial perfusion SPECT in elderly patients unable to perform exercise testing.. PubMed. 46(1). 12–8. 20 indexed citations
9.
Valkema, Roelf, François Jamar, Stanislas Pauwels, et al.. (2003). Phase 1 study of peptide receptor radionuclide therapy (PRRT) with [Y-90-DOTA,Tyr(3)]octreotide in patients with somatostatin receptor positive tumors. Cancer Biotherapy and Radiopharmaceuticals. 18(2). 295–295. 7 indexed citations
10.
Valkema, Roelf, et al.. (2003). 99mTc-tetrofosmin or 99mTc-sestamibi for double-phase parathyroid scintigraphy?. European Journal of Nuclear Medicine and Molecular Imaging. 30(2). 193–196. 20 indexed citations
11.
Valkema, Roelf, Marion de Jong, Willem H. Bakker, et al.. (2002). Phase I study of peptide receptor radionuclide therapy with [111In-DTPA0]octreotide: The rotterdam experience. Seminars in Nuclear Medicine. 32(2). 110–122. 328 indexed citations
12.
Jong, Marion de, Roelf Valkema, François Jamar, et al.. (2002). Somatostatin receptor-targeted radionuclide therapy of tumors: Preclinical and clinical findings. Seminars in Nuclear Medicine. 32(2). 133–140. 260 indexed citations
13.
Schinkel, Arend F. L., Jeroen J. Bax, Abdou Elhendy, et al.. (2002). Assessment of viable tissue in Q-wave regions by metabolic imaging using single-photon emission computed tomography in ischemic cardiomyopathy. The American Journal of Cardiology. 89(10). 1171–1175. 19 indexed citations
14.
Valkema, Roelf, François Jamar, Stanislas Pauwels, et al.. (2001). Safety and efficacy of [Y-90-DOTA,Tyr(3)]-octreotide (Y-90-SMT487; OctreoTher) peptide receptor radionuclide therapy (PRRT). Preliminary results of a phase-1 study. European Journal of Nuclear Medicine and Molecular Imaging. 28(8). 1025–1025. 10 indexed citations
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Elhendy, Abdou, Jeroen J. Bax, Roelf Valkema, et al.. (1999). Dobutamine stress thallium-201 single-photon emission tomography versus echocardiography for evaluation of the extent and location of coronary artery disease late after myocardial infarction. European Journal of Nuclear Medicine and Molecular Imaging. 26(5). 467–473. 6 indexed citations
17.
Bonjer, H. J., H. A. Bruining, Roelf Valkema, et al.. (1997). Single radionuclide scintigraphy with 99mTechnetium-Sestamibi and ultrasonography in hyperparathy-roidism.. EUR Research Repository (Erasmus University Rotterdam). 9 indexed citations
18.
Valkema, Roelf, et al.. (1994). Sharp peaks in the downslope phase of the diuresis renogram. Seminars in Nuclear Medicine. 24(4). 350–353. 1 indexed citations
19.
Eggelmeijer, F., J. Camps, Roelf Valkema, et al.. (1993). Bone mineral density in ambulant, non-steroid treated female patients with rheumatoid arthritis.. PubMed. 11(4). 381–5. 18 indexed citations
20.
Valkema, Roelf, F. J. F. E. Vismans, Socrates E. Papapoulos, E.K.J. Pauwels, & O. L. M. Bijvoet. (1989). Maintained improvement in calcium balance and bone mineral content in patients with osteoporosis treated with the bisphosphonate APD. Bone and Mineral. 5(2). 183–192. 124 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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