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Lung Fissures Segmentation

Lung fissures are double folds of visceral pleura that section the lungs to lobes. Both lungs have an oblique fissure separating the upper and lower lobes, and the right lung has a horizontal fissure separating the right middle lobe from the upper lobe.

Lung fissures

Identifying these borders is an important part of diagnosis and treatment plan for lung malignancy, of benign lung diseases. This is especially true in the context of CT-guided lung biopsy, bronchoscopy and surgical planning of lung lobectomy (or Lung Volume Reduction Surgery – LVRS). Similarly, any surgical procedure performed in the thorax (even a simple biopsy) bears the risk of crossing a lung fissure and increase the risk of pneumothorax. About half of the cases involving pneumothorax require a chest tube insertion, which results in longer hospitalizations, as well as higher risks for respiratory failure and mechanical ventilation. Hence, the importance of reducing that risk by the way of avoiding traversing and piercing lung fissures during the procedure.

The degree of pulmonary fissure completeness may also have an effect on morbidity and mortality rates related to video-assisted thoracoscopic surgery (VAST), where incomplete intralobular fissures could potentially increase surgical difficulty and likelihood of postoperative prolonged air leak. In addition, fissure incompleteness might also interfere with proper interpretation of radiographic findings within the lung.

Challenges in lung fissures segmentation

In CT scans, these fissures usually appear as lucent bands with hypovascularity, but also as thin white lines or dense bands. The variable appearance of the fissures makes detecting the fissures a very challenging task even for the experienced radiologist. All the more so, creating an automated algorithm to segment the lung. In many cases, the appearance of the fissure will be very vague and difficult to trace by traditional computer vision techniques. Nevertheless, RSIP Vision developed a very efficient segmentation module able to detect the fissures during the planning stage. Our image processing algorithm can demonstrate the lung fissures in 3D, enabling the radiologist/pulmonologist to plan the most careful trajectory.

Automated Lung fissures segmentation

The algorithm is based on deep learning technology, by which we train the system with radiologist’s annotated fissures in a large quantity of CT scans. The network is trained to detect the fissures by adapting the filters to find fissures in the 3D volume using information from more than one slice.

The results were validated through comparison with a set of scans that was not included in the training database. They indicate the high accuracy of the algorithm.

Deep learning is known as the best practice in the medical imaging area and RSIP Vision’s experience in 3D segmentation allows us to employ this powerful AI method also in very challenging situations, like in lung fissures segmentation.

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Pulmonology

RSIP Vision’s image processing expertise in medical imaging is currently used in numerous projects, including many applications of computer vision in pulmonology. We are very proud of our contribution to lung medicine: feature detection, lung segmentation and countless other works in the pulmonary imaging field enabled our clients to give the means to physicians to save lives by giving faster and more appropriate treatment to all kind of lung diseases. You can read below about some of our breakthrough developments in Pulmonology and Bronchoscopy.

View Pulmonology

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  • Pulmonology, RSIP Vision Learns

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