{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T14:28:26Z","timestamp":1753885706946,"version":"3.41.2"},"reference-count":17,"publisher":"World Scientific Pub Co Pte Ltd","issue":"01n02","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Med. Robot. Res."],"published-print":{"date-parts":[[2023,6]]},"abstract":"<jats:p> Positron Emission Tomography (PET) enables functional imaging of deep brain structures, but the bulk and weight of current systems preclude their use during many natural human activities, such as locomotion. The proposed long-term solution is to construct a robotic system that can support an imaging system surrounding the subject\u2019s head, and then move the system to accommodate natural motion. This requires a system to measure the motion of the head with respect to the imaging ring, for use by both the robotic system and the image reconstruction software. We report here the design, calibration, and experimental evaluation of a parallel string encoder mechanism for sensing this motion. Our results indicate that with kinematic calibration, the measurement system can achieve accuracy within 0.5[Formula: see text]mm, especially for small motions. <\/jats:p>","DOI":"10.1142\/s2424905x23400032","type":"journal-article","created":{"date-parts":[[2023,5,5]],"date-time":"2023-05-05T04:14:34Z","timestamp":1683260074000},"source":"Crossref","is-referenced-by-count":1,"title":["Calibration and Evaluation of a Motion Measurement System for PET Imaging Studies"],"prefix":"10.1142","volume":"08","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7264-2489","authenticated-orcid":false,"given":"Junxiang","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA"}]},{"given":"Ti","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Computer Science, Johns Hopkins University, Baltimore, MD 21218, USA"}]},{"given":"Iulian","family":"Iordachita","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA"}]},{"given":"Peter","family":"Kazanzides","sequence":"additional","affiliation":[{"name":"Department of Computer Science, Johns Hopkins University, Baltimore, MD 21218, USA"}]}],"member":"219","published-online":{"date-parts":[[2023,6,5]]},"reference":[{"key":"S2424905X23400032BIB001","first-page":"4030","volume-title":"Proc. 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