H-Index Ranking - Radiology, Nuclear Medicine And Imaging

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What is the H-Index?

The H-Index (or Hirsch Index) is a metric that captures both the productivity and the citation impact of a publication. A journal (or author) has an H-Index of h if it has published at least h papers, each of which has been cited at least h times. So a journal with an H-Index of 50 has published at least 50 papers, each cited at least 50 times.

How is the H-Index Calculated?

1. List all papers published by the journal, sorted by citation count (highest first).
2. Walk down the list. The H-Index is the largest position n where the n-th paper has at least n citations.
3. Example: a journal has 5 papers with citation counts {12, 8, 5, 3, 1}. The H-Index is 3 — because the 3rd paper has 5 citations (≥3), but the 4th paper has only 3 citations (=3, qualifies but the 5th has 1, breaking the chain).

The H-Index can never decrease over time — only grow as more citations accumulate. Unlike Impact Factor, it’s not affected by a single “blockbuster” paper that gets thousands of citations.

H-Index vs Impact Factor vs SJR

Metric	What It Measures	Time Window	Strength
H-Index	Productivity + sustained impact	Lifetime	Resists outliers
Impact Factor	Average citations per paper	2 years	Recent activity
SJR	Prestige-weighted citations	3 years	Quality signal

Why the H-Index Matters

• Long-term reputation: H-Index reflects sustained influence, not one-off bursts.
• Hard to game: A journal can’t artificially boost its H-Index by publishing one viral paper.
• Cross-database: Available from Scopus, Web of Science and Google Scholar (each gives slightly different numbers).
• Used for evaluation: Many funding agencies use H-Index alongside other metrics.

H-Index FAQ