### Abstract

This study compared digital measurement of aneurysm volume by 3D rotational angiography (3D-RA) with an approximation technique using three diameters of an aneurysm to re-interpret previously reported optimal packing densities (volume embolization ratio, VER) in coil embolization of intracranial aneurysms. Estimation of the volume of saccular aneurysms is important for calculation of the VER, which is in turn reported to be useful for prediction of coil compaction. The conventional formula for the volume estimation is V=4/3 π(A/2) (B/2) (C/2), where A, B, and C are the aneurysmal height, length, and width measured on 3D-RA image respectively. Using 3D rotational angiography data from 74 aneurysms, the approximated volume generated using the conventional formula was directly compared with the digitally measured volume. The digitally measured volume varied from 0.003 ml to 7.935 ml, and the dome-to-neck ratio (D/N) from 0.79 up to 4.62. We found that the conventional formula almost systematically underestimated the volume by up to 50 %, particularly when the neck was large relative to the dome (D/N<2). On average, digitally measured volume was 1.26~1.29 times larger than the approximated volume obtained using the conventional formula.Conventional 2D angiography based aneurysm volume calculation tends to underestimate an aneurysm volume, so the so-called VER (volume embolization ratio) could be overestimated.

Original language | English |
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Pages (from-to) | 154-158 |

Number of pages | 5 |

Journal | Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences |

Volume | 17 |

Issue number | 2 |

DOIs | |

Publication status | Published - 01-01-2011 |

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### All Science Journal Classification (ASJC) codes

- Radiology Nuclear Medicine and imaging
- Clinical Neurology
- Cardiology and Cardiovascular Medicine

### Cite this

*Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences*,

*17*(2), 154-158. https://doi.org/10.1177/159101991101700203

}

*Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences*, vol. 17, no. 2, pp. 154-158. https://doi.org/10.1177/159101991101700203

**Comparison of cerebral aneurysm volumes as determined by digitally measured 3D rotational angiography and approximation from three diameters.** / Sadato, A.; Hayakawa, M.; Tanaka, T.; Hirose, Y.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Comparison of cerebral aneurysm volumes as determined by digitally measured 3D rotational angiography and approximation from three diameters.

AU - Sadato, A.

AU - Hayakawa, M.

AU - Tanaka, T.

AU - Hirose, Y.

PY - 2011/1/1

Y1 - 2011/1/1

N2 - This study compared digital measurement of aneurysm volume by 3D rotational angiography (3D-RA) with an approximation technique using three diameters of an aneurysm to re-interpret previously reported optimal packing densities (volume embolization ratio, VER) in coil embolization of intracranial aneurysms. Estimation of the volume of saccular aneurysms is important for calculation of the VER, which is in turn reported to be useful for prediction of coil compaction. The conventional formula for the volume estimation is V=4/3 π(A/2) (B/2) (C/2), where A, B, and C are the aneurysmal height, length, and width measured on 3D-RA image respectively. Using 3D rotational angiography data from 74 aneurysms, the approximated volume generated using the conventional formula was directly compared with the digitally measured volume. The digitally measured volume varied from 0.003 ml to 7.935 ml, and the dome-to-neck ratio (D/N) from 0.79 up to 4.62. We found that the conventional formula almost systematically underestimated the volume by up to 50 %, particularly when the neck was large relative to the dome (D/N<2). On average, digitally measured volume was 1.26~1.29 times larger than the approximated volume obtained using the conventional formula.Conventional 2D angiography based aneurysm volume calculation tends to underestimate an aneurysm volume, so the so-called VER (volume embolization ratio) could be overestimated.

AB - This study compared digital measurement of aneurysm volume by 3D rotational angiography (3D-RA) with an approximation technique using three diameters of an aneurysm to re-interpret previously reported optimal packing densities (volume embolization ratio, VER) in coil embolization of intracranial aneurysms. Estimation of the volume of saccular aneurysms is important for calculation of the VER, which is in turn reported to be useful for prediction of coil compaction. The conventional formula for the volume estimation is V=4/3 π(A/2) (B/2) (C/2), where A, B, and C are the aneurysmal height, length, and width measured on 3D-RA image respectively. Using 3D rotational angiography data from 74 aneurysms, the approximated volume generated using the conventional formula was directly compared with the digitally measured volume. The digitally measured volume varied from 0.003 ml to 7.935 ml, and the dome-to-neck ratio (D/N) from 0.79 up to 4.62. We found that the conventional formula almost systematically underestimated the volume by up to 50 %, particularly when the neck was large relative to the dome (D/N<2). On average, digitally measured volume was 1.26~1.29 times larger than the approximated volume obtained using the conventional formula.Conventional 2D angiography based aneurysm volume calculation tends to underestimate an aneurysm volume, so the so-called VER (volume embolization ratio) could be overestimated.

UR - http://www.scopus.com/inward/record.url?scp=84862833383&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84862833383&partnerID=8YFLogxK

U2 - 10.1177/159101991101700203

DO - 10.1177/159101991101700203

M3 - Article

C2 - 21696652

AN - SCOPUS:84862833383

VL - 17

SP - 154

EP - 158

JO - Interventional Neuroradiology

JF - Interventional Neuroradiology

SN - 1123-9344

IS - 2

ER -