Assessment of collateral venous flow using temporary clip placement at ICG videoangiography

Hardian, Ridzky Firmansyah; Hanaoka, Yoshiki; Funato, Kohei; Agata, Masahiro; Itō, Kiyoshi; Horiuchi, Tetsuyoshi

doi:10.1007/s00701-020-04617-x

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…A surgical fluorescence microscope system is used to acquire images by injection of a fluorescence contrast medium, irradiation with an external light source, and imaging, as shown in Figure 1 a. The blood vessels or tumors can then be identified through their color [ 23 , 24 , 25 ].…”

Section: Analysis Of Fluorescence Emission and Specular Reflectionmentioning

confidence: 99%

“…As shown in Figure 1b, the purpose of using a fluorescent contrast agent is to observe the blood circulation status of blood vessels and to remove the tumor through fluorescent staining. Additionally, follow-up of the status of the retained tissue after tumor resection can be performed [23][24][25]. Surgical microscopes are classified into fixed type, pen type, and hand-held type, as shown in Figure 2a [8,20].…”

Section: Analysis Of Fluorescence Emission and Specular Reflectionmentioning

confidence: 99%

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Reduction of Specular Reflection Based on Linear Polarization Control for Fluorescence-Induced Diagnostic Evaluation

et al. 2022

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The primary goal of cancer surgery is to completely eliminate tumors. A real-time diagnostic method uses a fluorescence contrast agent and a surgical microscope to assess the status of tumor resection and the patient’s blood circulation. The biggest problem in imaging diagnostics using a microscope is the specular reflection phenomenon. While observing a lesion, the observation field may be obstructed due to specular reflection, making it difficult to obtain accurate results during the diagnostic process. Herein we propose a method to reduce specular reflection during tumor diagnosis by introducing a linearly polarized filter for a surgical microscope system. The method of angular direction adjustment of the filter ensures that only the horizontally polarized light passes through it, thereby obstructing the specular reflection. As a result of removing specular reflection, clear images were obtained at 90° and 270°. This experiment was conducted using phantoms and animals. Our results prove that the proposed method can be applied to imaging cameras used in internal medicine, surgery, and radiology for diagnosis.

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Section: Analysis Of Fluorescence Emission and Specular Reflectionmentioning

confidence: 99%

Section: Analysis Of Fluorescence Emission and Specular Reflectionmentioning

confidence: 99%

Reduction of Specular Reflection Based on Linear Polarization Control for Fluorescence-Induced Diagnostic Evaluation

et al. 2022

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Rational sacrifice of the superior petrosal vein

Zheng¹

2023

Journal of Clinical Neuroscience

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Specular Reflection Suppression through the Adjustment of Linear Polarization for Tumor Diagnosis Using Fluorescein Sodium

Lee

Yoon

Kim

et al. 2022

Sensors

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In tumor surgery, the edges of the tumor can be visually observed using a fluorescent contrast agent and a fluorescent imaging device. By distinguishing it from normal tissues and blood vessels, it is possible to objectively judge the extent of resection while visually observing it during surgery, and it guarantees safe tumor resection based on more information. However, the main problem of such an imaging device is the specular reflection phenomenon. If specular reflection overlaps with important lesion locations, they are a major factor leading to diagnostic errors. Here, we propose a method to reduce specular reflection that occurs during tumor diagnosis using a linear polarization filter and fluorescent contrast agent. To confirm the effect of removing specular reflection, a self-made fluorescein sodium vial phantom was used, and the reliability of the results was increased using a large animal (pig) test. As a result of the experiment, it was possible to obtain an image in which specular reflection was removed by controlling the rotation angle of the filter by 90° and 270°, and the same results were confirmed in the phantom experiment and the animal experiment.

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Assessment of collateral venous flow using temporary clip placement at ICG videoangiography

Cited by 3 publications

References 13 publications

Reduction of Specular Reflection Based on Linear Polarization Control for Fluorescence-Induced Diagnostic Evaluation

Reduction of Specular Reflection Based on Linear Polarization Control for Fluorescence-Induced Diagnostic Evaluation

Rational sacrifice of the superior petrosal vein

Specular Reflection Suppression through the Adjustment of Linear Polarization for Tumor Diagnosis Using Fluorescein Sodium

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