1. Articles from Laura E. Selmic

    1-11 of 11
    1. Optical coherence tomography for surgical margin evaluation of excised canine cutaneous and subcutaneous tumors

      Optical coherence tomography for surgical margin evaluation of excised canine cutaneous and subcutaneous tumors

      Currently, intraoperative tumor margin imaging is not routinely utilized in veterinary medicine. Optical coherence tomography (OCT) allows for real-time assessment of tissue morphology of 1-2 mm depth. The aims of this study were 1) to compare the histologic and OCT features of excised canine skin and subcutaneous specimens, and 2) to determine the diagnostic accuracy of OCT for surgical margin evaluation. The authors hypothesized that OCT imaging would correlate well with histopathology and that OCT would be sensitive for detection of incomplete margins. Eighty dogs were prospectively enrolled. Tumors were excised and the surgical margins were imaged using a spectral ...

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    2. Diagnostic accuracy of optical coherence tomography for surgical margin assessment of feline injection-site sarcoma

      Diagnostic accuracy of optical coherence tomography for surgical margin assessment of feline injection-site sarcoma

      The invasive, locally aggressive nature of feline injection-site sarcomas (FISS) pose a unique challenge for surgeons to obtain complete margins with surgical excision. Optical coherence tomography (OCT), an imaging technology that uses light waves to generate real-time views of tissue architecture, provides an emerging solution to this dilemma by allowing fast, high-resolution scanning of surgical margins. The purpose of this study was to use OCT to assess surgical margins of FISS and to evaluate the diagnostic accuracy of OCT for detecting residual cancer using six evaluators of varying experience. Five FISS were imaged with OCT to create a training set ...

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    3. Exploring optical coherence tomography imaging depth to differentiate tissues at surgical margins

      Exploring optical coherence tomography imaging depth to differentiate tissues at surgical margins

      Optical coherence tomography (OCT) is an imaging modality that provides real-time visualization of tissue microstructure. The goals of this study were to assess OCT image tissue depths (TD) with image processing, and other objective characteristics of tissue types at surgical margins in canine soft tissue sarcoma (STS). In this study, a single observer reviewed 248 images of four tissue types (sarcoma, skeletal muscle, adipose and fascia) collected from 24 dogs with STS. The observer evaluated for tissue characteristics and measured TDs utilizing ImageJ software. Images were evaluated in normal, Threshold and Binary conditions. Measurements were repeated one week later to ...

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    4. Intraoperative assessment of canine soft tissue sarcoma by deep learning enhanced optical coherence tomography

      Intraoperative assessment of canine soft tissue sarcoma by deep learning enhanced optical coherence tomography

      Soft tissue sarcoma (STS) is a locally aggressive and infiltrative tumor in dogs. Surgical resection is the treatment of choice for local tumor control. Currently, post-operative pathology is performed for surgical margin assessment. Spectral-domain optical coherence tomography (OCT) has recently been evaluated for its value for surgical margin assessment in some tumor types in dogs. The purpose of this study was to develop an automatic diagnosis system that can assist clinicians in real-time for OCT image interpretation of tissues at surgical margins. We utilized a ResNet-50 network to classify healthy and cancerous tissues. A patch-based approach was adopted to achieve ...

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    5. The feasibility and utility of optical coherence tomography directed histopathology for surgical margin assessment of canine mast cell tumors

      The feasibility and utility of optical coherence tomography directed histopathology for surgical margin assessment of canine mast cell tumors

      Histopathologic surgical margin assessment in veterinary patients is an imprecise science with assessment limited to a small proportion of the surgical margin due to time and finances. Incomplete excision of canine mast cell tumors (MCTs) alters treatment recommendations and prognosis. Optical coherence tomography (OCT) is a novel imaging modality that has been reported in a single veterinary study for surgical margin assessment. Twenty‐five dogs with 34 MCTs were enrolled in a prospective pilot‐study to assess the imaging characteristics of canine MCTs with OCT and to evaluate the feasibility and utility of OCT‐guided histopathology. All dogs underwent routine ...

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    6. Optical coherence tomography imaging of excised canine apocrine gland anal sac adenocarcinoma tumors

      Optical coherence tomography imaging of excised canine apocrine gland anal sac adenocarcinoma tumors

      Optical coherence tomography (OCT) is an optical imaging modality that has been investigated for real‐time surgical margin evaluation in human breast cancer patients. Previous veterinary OCT studies have been limited to surgical margin imaging for soft tissue sarcoma (STS) tumors. To the authors knowledge, OCT has never been used to characterize or evaluate other types of neoplasia in dogs. The goal of this study was to characterize the OCT imaging appearance of apocrine gland anal sac adenocarcinoma (AGASACA) in excised ex vivo specimens from five client‐owned dogs. All excised tissue surgical margins were imaged using a clinical spectral ...

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    7. Evaluating optical coherence tomography for surgical margin assessment of canine mammary tumors

      Evaluating optical coherence tomography for surgical margin assessment of canine mammary tumors

      Optical coherence tomography (OCT) uses near‐infrared light waves to generate real‐time, high‐resolution images on the microscopic scale similar to low power histopathology. Previous studies have demonstrated the use of OCT for real‐time surgical margin assessment for human breast cancer. The use of OCT for canine mammary tumors (CMT) could allow intra‐operative visualization of residual tumor at surgical margins. The purpose of this study was to assess OCT imaging for the detection of incomplete tumor resection following CMT surgery. We hypothesized that OCT images would have comparable features to histopathological images of tissues at the surgical ...

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    8. Near‐infrared imaging and optical coherence tomography for intraoperative visualization of tumors

      Near‐infrared imaging and optical coherence tomography for intraoperative visualization of tumors

      Surgical excision is the foundation of treatment for early‐stage solid tumors in man and companion animals. Complete excision with appropriate margins of surrounding tumor‐free tissue is crucial to survival. Intraoperative imaging allows real‐time visualization of tumors, assessment of surgical margins, and, potentially, lymph nodes and satellite metastatic lesions, allowing surgeons to perform complete tumor resections while sparing surrounding vital anatomic structures. This Review will focus on the use of near‐infrared imaging and optical coherence tomography for intraoperative tumor visualization.

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    9. Comparison between optical coherence tomographic and histopathologic appearances of artifacts caused by common surgical conditions and instrumentation

      Comparison between optical coherence tomographic and histopathologic appearances of artifacts caused by common surgical conditions and instrumentation

      Objective To document the appearance of artifacts created by commonly encountered surgical conditions and instrumentation on optical coherence tomography (OCT) and to compare these findings with histopathology. Study design Ex vivo study. Animals Five canine cadavers. Methods Skin, subcutaneous fat, skeletal muscle, and fascia samples were obtained from fresh canine cadavers. Blood pooling, hemostatic crushing, scalpel blade cut, monopolar electrosurgery, bipolar vessel sealing device, and ultrasonic energy surgical artifacts were induced on each tissue type. Each specimen was imaged with OCT and subsequently histologically processed. Results Most surgical instrumentation used for tumor excision created a high‐scattering region with local ...

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    10. Intraoperative imaging of surgical margins of canine soft tissue sarcoma using optical coherence tomography

      Intraoperative imaging of surgical margins of canine soft tissue sarcoma using optical coherence tomography

      Optical coherence tomography (OCT) is a rapid non‐invasive imaging technique that has shown high sensitivity for intraoperative surgical margin assessment in human breast cancer clinical trials. This promising technology has not been evaluated in veterinary medicine. The objective of this study was to correlate normal and abnormal histological features with OCT images for surgical margins from excised canine soft tissue sarcoma (STS) and to establish image evaluation criteria for identifying positive surgical margins. Fourteen client‐owned dogs underwent surgical resection of a STS and OCT imaging of 2‐4 areas of interest on the resected specimen were performed. Following ...

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    11. Intraoperative optical coherence tomography for soft tissue sarcoma differentiation and margin identification

      Intraoperative optical coherence tomography for soft tissue sarcoma differentiation and margin identification

      Background and Objective Sarcomas are rare but highly aggressive tumors, and local recurrence after surgical excision can occur in up to 50% cases. Therefore, there is a strong clinical need for accurate tissue differentiation and margin assessment to reduce incomplete resection and local recurrence. The purpose of this study was to investigate the use of optical coherence tomography (OCT) and a novel image texture-based processing algorithm to differentiate sarcoma from muscle and adipose tissue. Study Design and Methods In this study, tumor margin delineation in 19 feline and canine veterinary patients was achieved with intraoperative OCT to help validate tumor ...

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    1-11 of 11
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    Intraoperative optical coherence tomography for soft tissue sarcoma differentiation and margin identification Intraoperative imaging of surgical margins of canine soft tissue sarcoma using optical coherence tomography Comparison between optical coherence tomographic and histopathologic appearances of artifacts caused by common surgical conditions and instrumentation Near‐infrared imaging and optical coherence tomography for intraoperative visualization of tumors Evaluating optical coherence tomography for surgical margin assessment of canine mammary tumors Optical coherence tomography imaging of excised canine apocrine gland anal sac adenocarcinoma tumors The feasibility and utility of optical coherence tomography directed histopathology for surgical margin assessment of canine mast cell tumors Intraoperative assessment of canine soft tissue sarcoma by deep learning enhanced optical coherence tomography Exploring optical coherence tomography imaging depth to differentiate tissues at surgical margins Diagnostic accuracy of optical coherence tomography for surgical margin assessment of feline injection-site sarcoma Editorial – Optical Coherence Tomography Angiography: Considerations Regarding Diagnostic Parameters Imaging of the optic nerve: technological advances and future prospects