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Bevel-tip needles provide physicians the capability to steer the needle during long insertions to avoid vital anatomical structures in the patient and reduce post-operative patient discomfort. To provide needle placement feedback to the physician, sensors are embedded into needles for determining the real-time 3D shape of the needle during operation without needing to visualize the needle intra-operatively. Through expansive research in fiber optics, a plethora of biocompatible, MRI-compatible, optical shape-sensors have been developed to provide real-time shape feedback, such as single-core and multicore fiber Bragg gratings. In this paper, we directly compare single-core fiber-based and multicore fiber-based needle shape-sensing through similarly constructed, four active-area-sensorized bevel-tip needles inserted into phantom and ex-vivo tissues on the same experimental platform. In this work, we found that for shape-sensing in phantom tissue, the two needles performed identically with a [Formula: see text]-value of 0.164 &gt; 0.05, but in ex-vivo real tissue, the single-core fiber-sensorized needle significantly outperformed the multicore fiber configuration with a [Formula: see text]-value of 0.0005 &lt; 0.05. This paper also presents the experimental platform and method for directly comparing these optical shape sensors for the needle shape-sensing task, as well as provides direction, insight, and required considerations for future work in constructively optimizing sensorized needles. <\/jats:p>","DOI":"10.1142\/s2424905x23500046","type":"journal-article","created":{"date-parts":[[2023,11,3]],"date-time":"2023-11-03T04:18:05Z","timestamp":1698985085000},"source":"Crossref","is-referenced-by-count":7,"title":["Optical Fiber-Based Needle Shape-Sensing in Real Tissue: Single-Core versus Multicore Approaches"],"prefix":"10.1142","volume":"09","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6053-6964","authenticated-orcid":false,"given":"Dimitri A.","family":"Lezcano","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering, Whiting School of Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-6302-0840","authenticated-orcid":false,"given":"Yernar","family":"Zhetpissov","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Whiting School of Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-1856-6123","authenticated-orcid":false,"given":"Alexandra","family":"Cheng","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, Johns Hopkins University, Homewood Campus 3400 North Charles Street, Baltimore, MD 21218, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5091-2014","authenticated-orcid":false,"given":"Jin Seob","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Whiting School of Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2510-9008","authenticated-orcid":false,"given":"Iulian I.","family":"Iordachita","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Whiting School of Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA"}]}],"member":"219","published-online":{"date-parts":[[2023,12,1]]},"reference":[{"key":"S2424905X23500046BIB001","doi-asserted-by":"publisher","DOI":"10.1109\/TMECH.2005.848300"},{"key":"S2424905X23500046BIB002","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-5347(05)64024-4"},{"key":"S2424905X23500046BIB003","doi-asserted-by":"publisher","DOI":"10.1101\/cshperspect.a030361"},{"key":"S2424905X23500046BIB004","doi-asserted-by":"publisher","DOI":"10.1016\/j.juro.2011.06.057"},{"key":"S2424905X23500046BIB005","doi-asserted-by":"publisher","DOI":"10.1109\/TRO.2007.898972"},{"key":"S2424905X23500046BIB006","doi-asserted-by":"publisher","DOI":"10.1109\/TBME.2014.2334309"},{"key":"S2424905X23500046BIB007","doi-asserted-by":"publisher","DOI":"10.1109\/ICRA.2016.7487644"},{"key":"S2424905X23500046BIB008","doi-asserted-by":"publisher","DOI":"10.1007\/s11548-020-02300-1"},{"key":"S2424905X23500046BIB009","doi-asserted-by":"publisher","DOI":"10.1016\/j.ultrasmedbio.2021.11.008"},{"key":"S2424905X23500046BIB010","doi-asserted-by":"publisher","DOI":"10.1115\/DMD2022-1014"},{"key":"S2424905X23500046BIB011","doi-asserted-by":"publisher","DOI":"10.1109\/ICRA.2011.5979539"},{"key":"S2424905X23500046BIB012","doi-asserted-by":"publisher","DOI":"10.1007\/s11548-020-02226-8"},{"key":"S2424905X23500046BIB013","doi-asserted-by":"publisher","DOI":"10.3390\/magnetochemistry9030079"},{"key":"S2424905X23500046BIB014","doi-asserted-by":"publisher","DOI":"10.1007\/s11548-019-01945-x"},{"key":"S2424905X23500046BIB015","doi-asserted-by":"publisher","DOI":"10.1016\/j.athoracsur.2021.06.086"},{"key":"S2424905X23500046BIB016","doi-asserted-by":"publisher","DOI":"10.1109\/VRW58643.2023.00302"},{"key":"S2424905X23500046BIB017","doi-asserted-by":"publisher","DOI":"10.1109\/ICRA.2015.7139502"},{"key":"S2424905X23500046BIB018","doi-asserted-by":"publisher","DOI":"10.1109\/ROBIO49542.2019.8961717"},{"key":"S2424905X23500046BIB019","doi-asserted-by":"publisher","DOI":"10.1002\/rcs.1762"},{"key":"S2424905X23500046BIB020","doi-asserted-by":"publisher","DOI":"10.1016\/j.medengphy.2015.03.016"},{"key":"S2424905X23500046BIB021","first-page":"1072","volume":"70","author":"Donder A.","year":"2023","journal-title":"IEEE Trans. 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