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Schraivogel S, Aebischer P, Wagner F, Weder S, Mantokoudis G, Caversaccio M, Wimmer W. Postoperative Impedance-Based Estimation of Cochlear Implant Electrode Insertion Depth. Ear Hear 2023; 44:1379-1388. [PMID: 37157125 PMCID: PMC10583924 DOI: 10.1097/aud.0000000000001379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 04/01/2023] [Indexed: 05/10/2023]
Abstract
OBJECTIVES Reliable determination of cochlear implant electrode positions shows promise for clinical applications, including anatomy-based fitting of audio processors or monitoring of electrode migration during follow-up. Currently, electrode positioning is measured using radiography. The primary objective of this study is to extend and validate an impedance-based method for estimating electrode insertion depths, which could serve as a radiation-free and cost-effective alternative to radiography. The secondary objective is to evaluate the reliability of the estimation method in the postoperative follow-up over several months. DESIGN The ground truth insertion depths were measured from postoperative computed tomography scans obtained from the records of 56 cases with an identical lateral wall electrode array. For each of these cases, impedance telemetry records were retrieved starting from the day of implantation up to a maximum observation period of 60 mo. Based on these recordings, the linear and angular electrode insertion depths were estimated using a phenomenological model. The estimates obtained were compared with the ground truth values to calculate the accuracy of the model. RESULTS Analysis of the long-term recordings using a linear mixed-effects model showed that postoperative tissue resistances remained stable throughout the follow-up period, except for the two most basal electrodes, which increased significantly over time (electrode 11: ~10 Ω/year, electrode 12: ~30 Ω/year). Inferred phenomenological models from early and late impedance telemetry recordings were not different. The insertion depth of all electrodes was estimated with an absolute error of 0.9 mm ± 0.6 mm or 22° ± 18° angle (mean ± SD). CONCLUSIONS Insertion depth estimations of the model were reliable over time when comparing two postoperative computed tomography scans of the same ear. Our results confirm that the impedance-based position estimation method can be applied to postoperative impedance telemetry recordings. Future work needs to address extracochlear electrode detection to increase the performance of the method.
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Affiliation(s)
- Stephan Schraivogel
- Hearing Research Laboratory, ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
- Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Philipp Aebischer
- Hearing Research Laboratory, ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
- Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Franca Wagner
- Department of Diagnostic and Interventional Neuroradiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Stefan Weder
- Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Georgios Mantokoudis
- Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Marco Caversaccio
- Hearing Research Laboratory, ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
- Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Wilhelm Wimmer
- Hearing Research Laboratory, ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
- Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
- Technical University of Munich, Germany; TUM School of Medicine, Klinikum rechts der Isar, Department of Otorhinolaryngology
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Basten LM, Leyhr D, Murr D, Hauser T, Lüdin D, Romann M, Höner O, Fischer S, Gruber-Rouh T, Eichler K. Value of Magnetic Resonance Imaging for Skeletal Bone Age Assessment in Healthy Male Children. Top Magn Reson Imaging 2023; 32:50-55. [PMID: 37619372 PMCID: PMC10549875 DOI: 10.1097/rmr.0000000000000306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2023] [Revised: 07/18/2023] [Accepted: 07/20/2023] [Indexed: 08/26/2023]
Abstract
BACKGROUND Skeletal bone age assessment for medical reasons is usually performed by conventional x-ray with use of ionizing radiation. Few pilot studies have shown the possible use of magnetic resonance imaging (MRI). PURPOSE To comprehensively evaluate feasibility and value of MRI for skeletal bone age (SBA) assessment in healthy male children. MATERIALS AND METHODS In this prospective cross-sectional study, 63 male soccer athletes with mean age of 12.35 ± 1.1 years were examined. All participants underwent 3.0 Tesla MRI with coronal T1-weighted turbo spin echo (TSE), coronal proton density (PD)-weighted turbo spin echo (TSE), and T1-weighted three-dimensional (3D) volume interpolated breath-hold examination (VIBE) sequence. Subsequently, SBA was assessed by 3 independent blinded radiologists with different levels of experience using the common Greulich-Pyle (GP) atlas and the Tanner-Whitehouse (TW2) method. RESULTS In a mean total acquisition time of 5:04 ± 0:47 min, MR image quality was sufficient in all cases. MRI appraisal was significantly faster ( P < 0.0001) by GP with mean duration of 1:22 ± 0:08 min vs. 7:39 ± 0:28 min by TW. SBA assessment by GP resulted in mean age of 12.8 ± 1.2 years, by TW 13.0 ± 1.4 years. Interrater reliabilities were excellent for both GP (ICC = 0.912 (95% confidence interval [CI] = 0.868-0.944) and TW (ICC = 0.988 (95% CI = 0.980-0.992) and showed statistical significance ( P < 0.001). Subdivided, for GP, ICCs were 0.822 (95% CI = 0.680-0.907) and 0.843 (95% CI = 0.713-0.919) in Under 12 and Under 14 group. For TW, ICCs were 0.978 (95% CI = 0.958-0.989) in Under 12 and 0.979 (95% CI = 0.961-0.989) in Under 14 group. CONCLUSION MRI is a clinically feasible, rapidly evaluable method to assess skeletal bone age of healthy male children. Using the Greulich-Pyle (GP) atlas or the Tanner-Whitehouse (TW2) method, reliable results are obtained independent of the radiologist's experience level.
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Affiliation(s)
- Lajos M. Basten
- Department of Diagnostic and Interventional Radiology, Goethe-University Hospital Frankfurt, Frankfurt am Main, Germany
- Faculty of Medicine and University Hospital Cologne, Cologne Germany
| | - Daniel Leyhr
- Institute of Sports Science, Eberhard Karls University of Tübingen, Germany
- Methods Center, Eberhard Karls University of Tübingen, Germany
| | - Dennis Murr
- Institute of Sports Science, Eberhard Karls University of Tübingen, Germany
- Methods Center, Eberhard Karls University of Tübingen, Germany
| | - Thomas Hauser
- DFB (Deutscher-Fußball-Bund)-Akademie, Germany
- Faculty of Sports Sciences and Personality, Business and Law School, BSP, Berlin, Germany; and
| | - Dennis Lüdin
- Swiss Federal Institute of Sport Magglingen (SFISM), Magglingen, Switzerland
| | - Michael Romann
- Swiss Federal Institute of Sport Magglingen (SFISM), Magglingen, Switzerland
| | - Oliver Höner
- Institute of Sports Science, Eberhard Karls University of Tübingen, Germany
- Methods Center, Eberhard Karls University of Tübingen, Germany
| | - Sebastian Fischer
- Department of Diagnostic and Interventional Radiology, Goethe-University Hospital Frankfurt, Frankfurt am Main, Germany
| | - Tatjana Gruber-Rouh
- Department of Diagnostic and Interventional Radiology, Goethe-University Hospital Frankfurt, Frankfurt am Main, Germany
| | - Katrin Eichler
- Department of Diagnostic and Interventional Radiology, Goethe-University Hospital Frankfurt, Frankfurt am Main, Germany
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Xu L, Lu Y, Hu S, Li C, Tang Y, Wang H, Yan J, Chen J, Liu S, Sun Y, Wu X, Lin F, Lu P, Huang X. Unmanipulated haploidentical haematopoietic cell transplantation with radiation-free conditioning in Fanconi anaemia: A retrospective analysis from the Chinese Blood and Marrow Transplantation Registry Group. Br J Haematol 2022; 199:401-410. [PMID: 35989315 DOI: 10.1111/bjh.18408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 07/16/2022] [Accepted: 08/03/2022] [Indexed: 11/29/2022]
Abstract
Haematopoietic cell transplantation (HCT) is the only curative treatment for haematological complications in patients with Fanconi anaemia (FA). Haploidentical (haplo-) HCT is a promising alternative for FA. We aimed to analyse the outcomes of unmanipulated haplo-HCT in patients with FA with radiation-free conditioning. A total of 56 patients from 11 centres between 2013 and 2021 in China were retrospectively analysed. The mean (SD) cumulative incidence was 96.4% (0.08%) for 30-day neutrophil engraftment and 85.5% (0.24%) for 100-day platelet engraftment. With a median (range) follow-up of 2.4 (0.2-5.8) years, favourable mean (SD) overall survival of 80.9% (5.5%) and event-free survival of 79.3% (5.6%) were achieved. The mean (SD) incidences of acute graft-versus-host disease (aGvHD) Grade II-IV and Grade III-IV were 55.4% (0.45%) and 42.9 (0.45%) respectively. The mean (SD) cumulative incidence of 3-year chronic graft-versus-host disease (cGvHD) was 34.7% (0.86%) and that of moderate-to-severe cGvHD was 9.0% (0.19%). Our data demonstrate that in unmanipulated haplo-HCT for patients with FA, radiation-free regimens based on fludarabine and low-dose cyclophosphamide ± busulfan achieved favourable engraftment and survival with relatively high incidences of aGvHD and cGvHD. These results prompt the use of low-intensity conditioning without radiation and intensive GvHD prophylaxis when considering unmanipulated haplo-HCT in patients with FA.
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Affiliation(s)
- Lanping Xu
- Peking University People's Hospital, Peking University Institute of Haematology, National Clinical Research Center for Haematologic Disease, Collaborative Innovation Center of Haematology, Beijing Key Laboratory of Haematopoietic Stem Cell Transplant, Beijing, P.R. China
| | - Yue Lu
- Hebei Yanda Lu Daopei Hospital and Beijing Lu Daopei Hospital, Beijing, Hebei, China
| | - Shaoyan Hu
- Children's Hospital of Soochow University, Soochow, China
| | - Chunfu Li
- Nanfang-Chunfu Children's Institute of Hematology and Oncology, Dongguan, China
| | - Yongmin Tang
- The Children's Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Hongmei Wang
- The First Affiliated Hospital of Shandong First Medical University and Shandong Provincial Qianfoshan Hospital, Jinan, China
| | - Jinsong Yan
- The Second Hospital of Dalian Medical University, Dalian, China
| | - Jing Chen
- Shanghai Children's Medical Center, Shanghai, China
| | - Sixi Liu
- Shenzhen Children's Hospital, Shenzhen, China
| | - Yuan Sun
- Beijing Jingdu Children's Hospital, Beijing, China
| | - Xuedong Wu
- Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Fan Lin
- Peking University People's Hospital, Peking University Institute of Haematology, National Clinical Research Center for Haematologic Disease, Collaborative Innovation Center of Haematology, Beijing Key Laboratory of Haematopoietic Stem Cell Transplant, Beijing, P.R. China
| | - Peihua Lu
- Hebei Yanda Lu Daopei Hospital and Beijing Lu Daopei Hospital, Beijing, Hebei, China
| | - Xiaojun Huang
- Peking University People's Hospital, Peking University Institute of Haematology, National Clinical Research Center for Haematologic Disease, Collaborative Innovation Center of Haematology, Beijing Key Laboratory of Haematopoietic Stem Cell Transplant, Beijing, P.R. China.,Peking-Tsinghua Centre for Life Sciences, Beijing, China
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Lai KKL, Lee TTY, Lee MKS, Hui JCH, Zheng YP. Validation of Scolioscan Air-Portable Radiation-Free Three-Dimensional Ultrasound Imaging Assessment System for Scoliosis. Sensors (Basel) 2021; 21:2858. [PMID: 33921592 PMCID: PMC8073843 DOI: 10.3390/s21082858] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/12/2021] [Accepted: 04/14/2021] [Indexed: 12/03/2022]
Abstract
To diagnose scoliosis, the standing radiograph with Cobb's method is the gold standard for clinical practice. Recently, three-dimensional (3D) ultrasound imaging, which is radiation-free and inexpensive, has been demonstrated to be reliable for the assessment of scoliosis and validated by several groups. A portable 3D ultrasound system for scoliosis assessment is very much demanded, as it can further extend its potential applications for scoliosis screening, diagnosis, monitoring, treatment outcome measurement, and progress prediction. The aim of this study was to investigate the reliability of a newly developed portable 3D ultrasound imaging system, Scolioscan Air, for scoliosis assessment using coronal images it generated. The system was comprised of a handheld probe and tablet PC linking with a USB cable, and the probe further included a palm-sized ultrasound module together with a low-profile optical spatial sensor. A plastic phantom with three different angle structures built-in was used to evaluate the accuracy of measurement by positioning in 10 different orientations. Then, 19 volunteers with scoliosis (13F and 6M; Age: 13.6 ± 3.2 years) with different severity of scoliosis were assessed. Each subject underwent scanning by a commercially available 3D ultrasound imaging system, Scolioscan, and the portable 3D ultrasound imaging system, with the same posture on the same date. The spinal process angles (SPA) were measured in the coronal images formed by both systems and compared with each other. The angle phantom measurement showed the measured angles well agreed with the designed values, 59.7 ± 2.9 vs. 60 degrees, 40.8 ± 1.9 vs. 40 degrees, and 20.9 ± 2.1 vs. 20 degrees. For the subject tests, results demonstrated that there was a very good agreement between the angles obtained by the two systems, with a strong correlation (R2 = 0.78) for the 29 curves measured. The absolute difference between the two data sets was 2.9 ± 1.8 degrees. In addition, there was a small mean difference of 1.2 degrees, and the differences were symmetrically distributed around the mean difference according to the Bland-Altman test. Scolioscan Air was sufficiently comparable to Scolioscan in scoliosis assessment, overcoming the space limitation of Scolioscan and thus providing wider applications. Further studies involving a larger number of subjects are worthwhile to demonstrate its potential clinical values for the management of scoliosis.
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Affiliation(s)
| | | | | | | | - Yong-Ping Zheng
- Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong; (K.K.-L.L.); (T.T.-Y.L.); (M.K.-S.L.); (J.C.-H.H.)
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