{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,6]],"date-time":"2025-11-06T12:19:37Z","timestamp":1762431577560,"version":"3.37.3"},"reference-count":26,"publisher":"BMJ","issue":"4","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["J NeuroIntervent Surg"],"accepted":{"date-parts":[[2018,9,23]]},"published-print":{"date-parts":[[2019,4]]},"abstract":"<jats:sec><jats:title>Background and purpose<\/jats:title><jats:p>Evidence on how to select microcatheters to facilitate aneurysm catheterization during coil embolization is sparse. We developed a new method to define microcatheter tip location inside a patient-specific aneurysm model as a 3-dimensional probability map. We hypothesized that precision and accuracy of microcatheter tip positioning depend on catheter tip shape and aneurysmal geometry.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and methods<\/jats:title><jats:p>Under fluoroscopic guidance two to three operators introduced differently shaped microcatheters (straight, 45\u00b0, 90\u00b0) into eight aneurysm models targeting the anatomic center of the aneurysm. Each microcatheter position was recorded with flat-panel CT, and 3-dimensional probability maps of the microcatheter tip positions were generated. Maps were assessed with histogram analyses and compared between tip shapes, aneurysm locations and operators.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Among a total of 530 microcatheter insertions, the precision (mean distance between catheter positions) and accuracy (mean distance to target position) were significantly higher for the 45\u00b0 tip (1.10\u00b10.64\u2009mm, 3.81\u00b11.41\u2009mm, respectively) than for the 90\u00b0 tip (1.27\u00b10.57\u2009mm, p=0.010; 4.21\u00b11.60\u2009mm p=0.014, respectively). Accuracy was significantly higher in posterior communicating artery aneurysms (3.38\u00b11.20\u2009mm) than in aneurysms of the internal carotid artery (4.56\u00b11.54\u2009mm, p&lt;0.001).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Our method can be used tostatistically describe statistically microcatheter behavior in patient-specific anatomy, which may improve the available evidence guiding microcatheter shape selection. Experience increases the ability to reach the intended position with a microcatheter (accuracy) that is also dependent on the aneurysm location, whereas catheter tip choice determines the variability of catheter tip placements versus each other (precision). Clinical validation is required.<\/jats:p><\/jats:sec>","DOI":"10.1136\/neurintsurg-2018-014259","type":"journal-article","created":{"date-parts":[[2018,10,16]],"date-time":"2018-10-16T16:34:21Z","timestamp":1539707661000},"page":"425-430","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":5,"title":["A new method to statistically describe microcatheter tip position in patient-specific aneurysm models"],"prefix":"10.1136","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7423-9725","authenticated-orcid":false,"given":"Marie Teresa","family":"Nawka","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jan-Hendrik","family":"Buhk","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Susanne","family":"Gellissen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jan","family":"Sedlacik","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jens","family":"Fiehler","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andreas Maximilian","family":"Fr\u00f6lich","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2018,10,16]]},"reference":[{"key":"2024052304362042000_11.4.425.1","doi-asserted-by":"publisher","DOI":"10.1007\/s00062-015-0403-1"},{"key":"2024052304362042000_11.4.425.2","first-page":"104","article-title":"Endovascular techniques and devices for the treatment of intracranial aneurysms: a review of neurointerventional outcomes","volume":"60","author":"Raper","year":"2016","journal-title":"J Neurosurg Sci"},{"key":"2024052304362042000_11.4.425.3","doi-asserted-by":"publisher","DOI":"10.3174\/ajnr.A3802"},{"key":"2024052304362042000_11.4.425.4","doi-asserted-by":"publisher","DOI":"10.3174\/ajnr.A4834"},{"key":"2024052304362042000_11.4.425.5","doi-asserted-by":"publisher","DOI":"10.3174\/ajnr.A4678"},{"key":"2024052304362042000_11.4.425.6","doi-asserted-by":"publisher","DOI":"10.3174\/ajnr.A5608"},{"key":"2024052304362042000_11.4.425.7","doi-asserted-by":"crossref","first-page":"178","DOI":"10.1016\/j.wneu.2015.03.006","article-title":"Microcatheter shaping for intracranial aneurysm coiling using the 3-dimensional printing rapid prototyping technology: preliminary result in the first 10 consecutive cases","volume":"84","author":"Namba","year":"2015","journal-title":"World Neurosurg"},{"key":"2024052304362042000_11.4.425.8","doi-asserted-by":"publisher","DOI":"10.1177\/1971400915602803"},{"key":"2024052304362042000_11.4.425.9","doi-asserted-by":"publisher","DOI":"10.3174\/ajnr.A4078"},{"key":"2024052304362042000_11.4.425.10","doi-asserted-by":"publisher","DOI":"10.1161\/STROKEAHA.107.504670"},{"key":"2024052304362042000_11.4.425.11","doi-asserted-by":"publisher","DOI":"10.1227\/01.NEU.0000370891.67129.2F"},{"key":"2024052304362042000_11.4.425.12","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1016\/j.compbiomed.2016.07.005","article-title":"Tailor-made shaping of microcatheters using three-dimensional printed vessel models for endovascular coil embolization","volume":"77","author":"Ishibashi","year":"2016","journal-title":"Comput Biol Med"},{"key":"2024052304362042000_11.4.425.13","doi-asserted-by":"crossref","unstructured":"Andr\u00e9 A , Boch AL , Di Maria F , et al . 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