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Intraoperative Imaging Techniques to Improve Surgical Resection Margins of Oropharyngeal Squamous Cell Cancer: A Comprehensive Review of Current Literature. Cancers (Basel) 2023; 15:cancers15030896. [PMID: 36765858 PMCID: PMC9913756 DOI: 10.3390/cancers15030896] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 01/24/2023] [Accepted: 01/26/2023] [Indexed: 02/04/2023] Open
Abstract
Inadequate resection margins in head and neck squamous cell carcinoma surgery necessitate adjuvant therapies such as re-resection and radiotherapy with or without chemotherapy and imply increasing morbidity and worse prognosis. On the other hand, taking larger margins by extending the resection also leads to avoidable increased morbidity. Oropharyngeal squamous cell carcinomas (OPSCCs) are often difficult to access; resections are limited by anatomy and functionality and thus carry an increased risk for close or positive margins. Therefore, there is a need to improve intraoperative assessment of resection margins. Several intraoperative techniques are available, but these often lead to prolonged operative time and are only suitable for a subgroup of patients. In recent years, new diagnostic tools have been the subject of investigation. This study reviews the available literature on intraoperative techniques to improve resection margins for OPSCCs. A literature search was performed in Embase, PubMed, and Cochrane. Narrow band imaging (NBI), high-resolution microendoscopic imaging, confocal laser endomicroscopy, frozen section analysis (FSA), ultrasound (US), computed tomography scan (CT), (auto) fluorescence imaging (FI), and augmented reality (AR) have all been used for OPSCC. NBI, FSA, and US are most commonly used and increase the rate of negative margins. Other techniques will become available in the future, of which fluorescence imaging has high potential for use with OPSCC.
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Bishop KW, Maitland KC, Rajadhyaksha M, Liu JTC. In vivo microscopy as an adjunctive tool to guide detection, diagnosis, and treatment. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:JBO-220032-PER. [PMID: 35478042 PMCID: PMC9043840 DOI: 10.1117/1.jbo.27.4.040601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 04/05/2022] [Indexed: 05/05/2023]
Abstract
SIGNIFICANCE There have been numerous academic and commercial efforts to develop high-resolution in vivo microscopes for a variety of clinical use cases, including early disease detection and surgical guidance. While many high-profile studies, commercialized products, and publications have resulted from these efforts, mainstream clinical adoption has been relatively slow other than for a few clinical applications (e.g., dermatology). AIM Here, our goals are threefold: (1) to introduce and motivate the need for in vivo microscopy (IVM) as an adjunctive tool for clinical detection, diagnosis, and treatment, (2) to discuss the key translational challenges facing the field, and (3) to propose best practices and recommendations to facilitate clinical adoption. APPROACH We will provide concrete examples from various clinical domains, such as dermatology, oral/gastrointestinal oncology, and neurosurgery, to reinforce our observations and recommendations. RESULTS While the incremental improvement and optimization of IVM technologies should and will continue to occur, future translational efforts would benefit from the following: (1) integrating clinical and industry partners upfront to define and maintain a compelling value proposition, (2) identifying multimodal/multiscale imaging workflows, which are necessary for success in most clinical scenarios, and (3) developing effective artificial intelligence tools for clinical decision support, tempered by a realization that complete adoption of such tools will be slow. CONCLUSIONS The convergence of imaging modalities, academic-industry-clinician partnerships, and new computational capabilities has the potential to catalyze rapid progress and adoption of IVM in the next few decades.
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Affiliation(s)
- Kevin W. Bishop
- University of Washington, Department of Bioengineering, Seattle, Washington, United States
- University of Washington, Department of Mechanical Engineering, Seattle, Washington, United States
| | - Kristen C. Maitland
- Texas A&M University, Department of Biomedical Engineering, College Station, Texas, United States
| | - Milind Rajadhyaksha
- Memorial Sloan Kettering Cancer Center, Dermatology Service, New York, New York, United States
| | - Jonathan T. C. Liu
- University of Washington, Department of Bioengineering, Seattle, Washington, United States
- University of Washington, Department of Mechanical Engineering, Seattle, Washington, United States
- University of Washington, Department of Laboratory Medicine and Pathology, Seattle, Washington, United States
- Address all correspondence to Jonathan T.C. Liu,
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BAYRAM A, ESKİİZMİR G, CİNGİ C, HANNA E. Robotic Surgery in Otolaryngology-Head and Neck Surgery: Yesterday, Today and Tomorrow. ENT UPDATES 2020. [DOI: 10.32448/entupdates.780604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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The future of robotic surgery in otolaryngology – head and neck surgery. Oral Oncol 2020; 101:104510. [DOI: 10.1016/j.oraloncology.2019.104510] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Revised: 11/30/2019] [Accepted: 12/03/2019] [Indexed: 12/29/2022]
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Fakurnejad S, van Keulen S, Nishio N, Engelen M, van den Berg NS, Lu G, Birkeland A, Baik F, Colevas AD, Rosenthal EL, Martin BA. Fluorescence molecular imaging for identification of high-grade dysplasia in patients with head and neck cancer. Oral Oncol 2019; 97:50-55. [PMID: 31421471 PMCID: PMC6907742 DOI: 10.1016/j.oraloncology.2019.08.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 07/15/2019] [Accepted: 08/06/2019] [Indexed: 11/22/2022]
Abstract
OBJECTIVE High-grade dysplasia is associated with a risk of malignant transformation, and it is necessary to distinguish from normal epithelium or low-grade dysplasia, especially in the intraoperative setting. We hypothesize that an anti-epidermal growth factor receptor (EGFR) contrast agent can be used to differentiate high-grade dysplasia from low-grade dysplasia and normal epithelium. MATERIALS AND METHODS Patients with biopsy proven head and neck squamous cell carcinoma (HNSCC) were enrolled in a clinical trial using systemically injected fluorescently labeled anti-EGFR antibody (panitumumab-IRDye800CW) (NCT02415881). Paraffin embedded tumor specimens from 11 patients were evaluated by fluorescence histopathology. Hematoxylin and eosin (H&E) slides were reviewed by a board-certified pathologist, and regions of invasive squamous cell carcinoma, high-grade dysplasia and low-grade dysplasia were delineated. EGFR expression was assessed for each patient by way of immunohistochemistry. RESULTS 11 patients were included in the study with a total of 219 areas on tissue sections analyzed; 68 normal epithelium, 53 low-grade dysplasia, 48 high-grade dysplasia, and 50 malignant regions. The signal-to-background ratio (SBR) increased proportionally with increasing grade of dysplasia; normal epithelium (1.5 ± 0.1), low-grade dysplasia (1.8 ± 0.1), high-grade dysplasia: (2.3 ± 0.2). High-grade dysplasia had a significantly higher SBR when compared to normal or low-grade dysplasia (p < 0.05). Fluorescence histopathology positively correlated with EGFR expression by immunohistochemistry, which also increased proportionally with increasing degree of dysplasia. CONCLUSION Molecular imaging with an anti-EGFR agent can successfully discriminate high-grade dysplastic lesions from low-grade dysplasia and normal epithelium.
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Affiliation(s)
- Shayan Fakurnejad
- Department of Otolaryngology, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA 94305, United States.
| | - Stan van Keulen
- Department of Otolaryngology, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA 94305, United States; Department of Oral and Maxillofacial Surgery, Amsterdam University Medical Center, De Boelelaan 1118, 1081 HV Amsterdam, the Netherlands.
| | - Naoki Nishio
- Department of Otolaryngology, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA 94305, United States.
| | - Myrthe Engelen
- Department of Otolaryngology, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA 94305, United States.
| | - Nynke S van den Berg
- Department of Otolaryngology, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA 94305, United States.
| | - Guolan Lu
- Department of Otolaryngology, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA 94305, United States.
| | - Andrew Birkeland
- Department of Otolaryngology, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA 94305, United States.
| | - Fred Baik
- Department of Otolaryngology, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA 94305, United States.
| | - A Dimitrios Colevas
- Department of Medicine, Division of Medical Oncology, University School of Medicine, 269 Campus Drive, Stanford, CA 94305, United States.
| | - Eben L Rosenthal
- Department of Otolaryngology, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA 94305, United States.
| | - Brock A Martin
- Department of Pathology, Stanford University School of Medicine, 291 Campus Drive, Stanford, CA 94305, United States.
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Halicek M, Fabelo H, Ortega S, Little JV, Wang X, Chen AY, Callico GM, Myers LL, Sumer BD, Fei B. Cancer Detection Using Hyperspectral Imaging and Evaluation of the Superficial Tumor Margin Variance with Depth. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2019; 10951:109511A. [PMID: 32489227 PMCID: PMC7265739 DOI: 10.1117/12.2512985] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Head and neck squamous cell carcinoma (SCCa) is primarily managed by surgical resection. Recurrence rates after surgery can be as high as 55% if residual cancer is present. In this study, hyperspectral imaging (HSI) is evaluated for detection of SCCa in ex-vivo surgical specimens. Several methods are investigated, including convolutional neural networks (CNNs) and a spectral-spatial variant of support vector machines. Quantitative results demonstrate that additional processing and unsupervised filtering can improve CNN results to achieve optimal performance. Classifying regions that include specular glare, the average AUC is increased from 0.73 [0.71, 0.75 (95% confidence interval)] to 0.81 [0.80, 0.83] through an unsupervised filtering and majority voting method described. The wavelengths of light used in HSI can penetrate different depths into biological tissue, while the cancer margin may change with depth and create uncertainty in the ground-truth. Through serial histological sectioning, the variance in cancer-margin with depth is also investigated and paired with qualitative classification heat maps using the methods proposed for the testing group SCC patients.
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Affiliation(s)
- Martin Halicek
- Department of Bioengineering, University of Texas at Dallas, Dallas, TX, USA
- Georgia Inst. of Tech. & Emory Univ., Dept. of Biomedical Engineering, Atlanta, GA
- Medical College of Georgia, Augusta University, Augusta, GA
| | - Himar Fabelo
- Department of Bioengineering, University of Texas at Dallas, Dallas, TX, USA
- Institute for Applied Microelectronics, University of Las Palmas de Gran Canaria, Spain
| | - Samuel Ortega
- Institute for Applied Microelectronics, University of Las Palmas de Gran Canaria, Spain
| | - James V Little
- Emory Univ. School of Medicine, Dept. of Pathology & Laboratory Medicine, Atlanta, GA
| | - Xu Wang
- Emory Univ. School of Medicine, Dept. of Hematology & Medical Oncology, Atlanta, GA
| | - Amy Y Chen
- Emory University School of Medicine, Dept. of Otolaryngology, Atlanta, GA
| | | | - Larry L Myers
- University of Texas Southwestern Medical Center, Dept. of Otolaryngology, Dallas, TX
| | - Baran D Sumer
- University of Texas Southwestern Medical Center, Dept. of Otolaryngology, Dallas, TX
| | - Baowei Fei
- Department of Bioengineering, University of Texas at Dallas, Dallas, TX, USA
- Univ. of Texas Southwestern Medical Center, Advanced Imaging Research Center, Dallas, TX
- University of Texas Southwestern Medical Center, Department of Radiology, Dallas, TX
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Codipilly DC, Qin Y, Dawsey SM, Kisiel J, Topazian M, Ahlquist D, Iyer PG. Screening for esophageal squamous cell carcinoma: recent advances. Gastrointest Endosc 2018; 88:413-426. [PMID: 29709526 PMCID: PMC7493990 DOI: 10.1016/j.gie.2018.04.2352] [Citation(s) in RCA: 173] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 04/20/2018] [Indexed: 02/08/2023]
Abstract
Esophageal squamous cell carcinoma (ESCC) is the most common type of esophageal cancer worldwide, with a high mortality due to advanced stage at diagnosis. Although most common in an area known as the Asian Esophageal Cancer Belt, which extends from the Caspian Sea to northern China, and in parts of Africa, high-risk populations also exist elsewhere in the world. Screening for ESCC has been practiced in a few geographic areas and high-risk populations, with varying levels of success. Esophageal squamous dysplasia is recognized as the precursor lesion for ESCC. Endoscopic screening for ESCC/esophageal squamous dysplasia is expensive and not sufficiently available in many high-risk regions. Recent advances in non-endoscopic screening enhanced by biomarker-based disease detection have raised the prospect of improved accuracy and availability of screening for esophageal squamous dysplasia and early stage ESCC. Development of a cost-effective, accurate, and well-tolerated screening test, if applied in endemic areas and high-risk populations, has the potential to reduce mortality from this deadly disease worldwide. In this review, we summarize recent developments in endoscopic and non-endoscopic screening modalities.
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Affiliation(s)
- DC Codipilly
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester
| | - Y Qin
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester
| | - Sanford M. Dawsey
- Division of Cancer Epidemiology and Genetics, National Cancer Institute
| | - John Kisiel
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester
| | - Mark Topazian
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester
| | - David Ahlquist
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester
| | - PG Iyer
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester
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Giataganas P, Hughes M, Payne CJ, Wisanuvej P, Temelkuran B, Yang GZ. Intraoperative Robotic-Assisted Large-Area High-Speed Microscopic Imaging and Intervention. IEEE Trans Biomed Eng 2018; 66:208-216. [PMID: 29993497 DOI: 10.1109/tbme.2018.2837058] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE Probe-based confocal endomicroscopy is an emerging high-magnification optical imaging technique that provides in vivo and in situ cellular-level imaging for real-time assessment of tissue pathology. Endomicroscopy could potentially be used for intraoperative surgical guidance, but it is challenging to assess a surgical site using individual microscopic images due to the limited field-of-view and difficulties associated with manually manipulating the probe. METHODS In this paper, a novel robotic device for large-area endomicroscopy imaging is proposed, demonstrating a rapid, but highly accurate, scanning mechanism with image-based motion control, which is able to generate histology-like endomicroscopy mosaics. The device also includes, for the first time in robotic-assisted endomicroscopy, the capability to ablate tissue without the need for an additional tool. RESULTS The device achieves preprogrammed trajectories with positioning accuracy of less than 30 [Formula: see text], while the image-based approach demonstrated that it can suppress random motion disturbances up to [Formula: see text]. Mosaics are presented from a range of ex vivo human and animal tissues, over areas of more than [Formula: see text], scanned in approximate [Formula: see text]. CONCLUSION This paper demonstrates the potential of the proposed instrument to generate large-area, high-resolution microscopic images for intraoperative tissue identification and margin assessment. SIGNIFICANCE This approach presents an important alternative to current histology techniques, significantly reducing the tissue assessment time, while simultaneously providing the capability to mark and ablate suspicious areas intraoperatively.
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Tirelli G, Piovesana M, Marcuzzo AV, Gatto A, Biasotto M, Bussani R, Zandonà L, Giudici F, Boscolo Nata F. Tailored resections in oral and oropharyngeal cancer using narrow band imaging. Am J Otolaryngol 2018; 39:197-203. [PMID: 29150027 DOI: 10.1016/j.amjoto.2017.11.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 10/28/2017] [Accepted: 11/09/2017] [Indexed: 10/18/2022]
Abstract
PURPOSE In a previous pilot study we observed that intra-operative narrow-band imaging (NBI) helps achieve clear superficial resection margins. The aim of this study was to verify if the use of intra-operative NBI can help to obtain tailored resections and if it is influenced by the lesion site, aspects not investigated in our previous study. MATERIALS AND METHODS The resection margins of 39 oral and 22 oropharyngeal squamous cell carcinomas were first set at 1.5cm from the macroscopic lesion boundary (white light, WL, tattoo). Then, the superficial tumor extension was more precisely defined with NBI, giving rise to three possible situations: NBI tattoo larger than the WL tattoo, NBI tattoo coinciding with the WL tattoo, or NBI tattoo smaller than the WL tattoo. For each of these situations the space comprised between the NBI and WL tattoos was defined "NBI positive", "NBI null", and "NBI negative", respectively. Resections were performed following the outer tattoo. The number of clear superficial resection margins, and the pathological response on the "NBI-positive" and the "NBI-negative" areas were recorded. RESULTS We obtained 80.3% negative superficial resection margins. NBI provided a more precise definition of superficial tumor extension in 43 patients. Sensitivity, specificity, positive and negative predictive values were 94.4%, 64%, 79.1% and 88.9%, respectively; a test of proportions demonstrated they were not influenced by tumor site. CONCLUSIONS NBI could allow for real-time definition of superficial tumor extension with possible tailored resections and fewer positive superficial resection margins; it is not influenced by tumor site.
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Tirelli G, Piovesana M, Gatto A, Torelli L, Boscolo Nata F. Is NBI-Guided Resection a Breakthrough for Achieving Adequate Resection Margins in Oral and Oropharyngeal Squamous Cell Carcinoma? Ann Otol Rhinol Laryngol 2016; 125:596-601. [PMID: 27056557 DOI: 10.1177/0003489416641428] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVES Obtaining free resection margins is the main goal of oncological surgeons. Narrow-band imaging (NBI) has been recently used to help define resection margins in transoral laser microsurgery for laryngeal carcinoma. The aim of this study was to evaluate the effect of intraoperative NBI in defining the surgical resection margins of oral and oropharyngeal cancers. METHODS Between January 2014 and March 2015, NBI was used intraoperatively after an initial definition of resection margins with white light in 26 patients (group A). The rate of superficial positive margins at definitive histology was compared with that of a historical cohort of 44 patients (group B) previously managed without the use of intraoperative NBI. RESULTS A statistically significant reduction in the rate of positive superficial margins was observed at definitive histology in group A (P = .028). NBI helped to identify the presence of dysplasia and cancer around the visible tumor not otherwise detectable with visual examination alone. CONCLUSIONS NBI could be a useful tool for obtaining free resection margins in oral and oropharyngeal carcinoma.
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Affiliation(s)
| | - Marco Piovesana
- ENT Clinic, Head and Neck Department, University of Trieste, Italy
| | - Annalisa Gatto
- ENT Clinic, Head and Neck Department, University of Trieste, Italy
| | - Lucio Torelli
- Department of Mathematics and Earth Science, University of Trieste, Italy
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VICINI C, MONTEVECCHI F, D'AGOSTINO G, DE VITO A, MECCARIELLO G. A novel approach emphasising intra-operative superficial margin enhancement of head-neck tumours with narrow-band imaging in transoral robotic surgery. ACTA OTORHINOLARYNGOLOGICA ITALICA : ORGANO UFFICIALE DELLA SOCIETA ITALIANA DI OTORINOLARINGOLOGIA E CHIRURGIA CERVICO-FACCIALE 2015; 35:157-61. [PMID: 26246659 PMCID: PMC4510935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 03/08/2015] [Indexed: 11/28/2022]
Abstract
The primary goal of surgical oncology is to obtain a tumour resection with disease-free margins. Transoral robotic surgery (TORS) for surgical treatment of head-neck cancer is commensurate with standard treatments. However, the likelihood of positive margins after TORS is up to 20.2% in a recent US survey. The aim of this study is to evaluate the efficacy and the feasibility of narrow-band imaging (NBI) during TORS in order to improve the ability to achieve disease-free margins during tumour excision. The present study was conducted at the ENT, Head- Neck Surgery and Oral Surgery Unit, Department of Special Surgery, Morgagni Pierantoni Hospital, Azienda USL Romagna. From March 2008 to January 2015, 333 TORS were carried out for malignant and benign diseases. For the present study, we retrospectively evaluated 58 biopsy-proven squamous cell carcinoma patients who underwent TORS procedures. Patients were divided into 2 groups: (1) 32 who underwent TORS and intra-operative NBI evaluation (NBI-TORS); (2) 21 who underwent TORS with standard intra-operative white-light imaging (WLITORS). Frozen section analysis of margins on surgical specimens showed a higher rate of negative superficial lateral margins in the NBI-TORS group compared with the WLI-TORS group (87.9% vs. 57.9%, respectively, p = 0.02). The sensitivity and specificity of intra-operative use of NBI, respectively, were 72.5% and 66.7% with a negative predictive value of 87.9%. Tumour margin enhancement provided by NBI associated with magnification and 3-dimensional view of the surgical field might increase the capability to achieve an oncologically-safe resection in challenging anatomical areas where minimal curative resection is strongly recommended for function preservation.
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Affiliation(s)
| | | | | | | | - G. MECCARIELLO
- Address for correspondence: Giuseppe Meccariello, ENT, Head- Neck Surgery and Oral Surgery Unit, Department of Special Surgery, "Morgagni Pierantoni Hospital", Forlì, Italy. Tel. +39 054 3735656. E-mail:
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Giataganas P, Hughes M, Yang GZ. Force adaptive robotically assisted endomicroscopy for intraoperative tumour identification. Int J Comput Assist Radiol Surg 2015; 10:825-32. [PMID: 25900339 DOI: 10.1007/s11548-015-1179-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 03/13/2015] [Indexed: 02/02/2023]
Abstract
PURPOSE For effective tumour margin definition for cancer surgery, there is an increasing demand for the development of real-time intraoperative tissue biopsy techniques. Recent advances in miniaturized biophotonics probes have permitted the development of endomicroscopy techniques that are clinically attractive. With these approaches, cellular-level imaging can be achieved through millimetre-scale flexible probes and be performed in real-time, in vivo and in situ. Due to the limited field of view and flexibility of these probes, however, large area tissue coverage for acquiring histology-like images over complex three-dimensional surfaces is challenging. This is particularly the case because current surgical robots, such as the Da Vinci ®, lack haptic feedback, making it difficult to maintain optimum tissue contact when these probes are deployed in vivo. METHODS This paper proposes a simple force-controlled pick-up probe that can be integrated with the Da Vinci instruments for intraoperative endomicroscopy imaging. The device uses a new low-friction air bearing with adaptive axial force control to maintain constant contact between the tissue and the imaging probe, facilitating microscopy scans over complex surfaces. Detailed ex vivo user experiments have been conducted to demonstrate the effectiveness of the technique. RESULTS The adaptive probe mount could achieve consistent low-magnitude probe-sample contact forces compared with a rigid mount. In the user study, the adaptive probe combined with a high frame rate endomicroscopy system allowed larger mosaics to be generated over curved surfaces. CONCLUSIONS The device can improve the performance of large area mosaicking over complex 3D surfaces with improved handling and intraoperative control.
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Affiliation(s)
- Petros Giataganas
- Hamlyn Centre for Robotic Surgery, Institute of Global Health Innovation, Imperial College London, London, SW7 2AZ, UK,
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