Relationship between Two Types of Coil Packing Densities Relative to Aneurysm Size

Keun Young Park, Byung Moon Kim, Eun Hyun Ihm, Jang Hyun Baek, Dong Joon Kim, Dong Ik Kim, Seung Kon Huh, Jae Whan Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


BACKGROUND AND PURPOSE: Coil packing density (PD) can be calculated via a formula (PDF) or software (PDS). Two types of PD can be different from each other for same aneurysm. This study aimed to evaluate the interobserver agreement and relationships between the 2 types of PD relative to aneurysm size. METHODS: Consecutive 420 saccular aneurysms were treated with coiling. PD (PDF, [coil volume]/[volume calculated by formula] and PDS, [coil volume]/[volume measured by software]) was calculated and prospectively recorded. Interobserver agreement was evaluated between PDF and PDS. Additionally, the relationships between PDF and PDS relative to aneurysm size were subsequently analyzed. RESULTS: Interobserver agreement for PDF and PDS was excellent (Intraclass correlation coefficient, PDF; 0.967 and PDS; 0.998). The ratio of PDF and PDS was greater for smaller aneurysms and converged toward 1.0 as the maximum dimension (DM) of aneurysm increased. Compared with PDS, PDF was overestimated by a mean of 28% for DM < 5 mm, by 17% for 5 mm ≤ DM < 10 mm, and by 9% for DM ≥ 10 mm (P < 0.01). CONCLUSIONS: Interobserver agreement for PDF and PDS was excellent. However, PDF was overestimated in smaller aneurysms and converged to PDS as aneurysm size increased.

Original languageEnglish
Pages (from-to)415-419
Number of pages5
JournalJournal of Neuroimaging
Issue number3
Publication statusPublished - 2015 May 1

Bibliographical note

Publisher Copyright:
© 2014 by the American Society of Neuroimaging.

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging
  • Clinical Neurology


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