3D reconstruction of GI tract texture surface using Capsule Endoscopy Images

2012 ◽  
Author(s):  
Qian Zhao ◽  
Max Q.-H. Meng
Keyword(s):  
3D Reconstruction ◽  
Capsule Endoscopy ◽  
Gi Tract ◽  
Texture Surface

scholarly journals Direct visualization of drug behaviors in the upper GI tract via magnetically controlled capsule endoscopy

VideoGIE ◽  
2021 ◽  
Author(s):  
Yuan-Chen Wang ◽  
Jun Pan ◽  
Bin Jiang ◽  
Yang-Yang Qian ◽  
Xiao-Ou Qiu ◽  
...  
Keyword(s):  
Capsule Endoscopy ◽  
Direct Visualization ◽  
Gi Tract ◽  
Upper Gi ◽  
Upper Gi Tract

Diagnostic yield of magnetically assisted capsule endoscopy versus gastroscopy in recurrent and refractory iron deficiency anemia

Endoscopy ◽  
2018 ◽  
Vol 51 (05) ◽  
pp. 409-418 ◽  
Author(s):  
Hey-Long Ching ◽  
Melissa F. Hale ◽  
Matthew Kurien ◽  
Jennifer A. Campbell ◽  
Stefania Chetcuti Zammit ◽  
...  
Keyword(s):  
Small Bowel ◽  
Iron Deficiency ◽  
Iron Deficiency Anemia ◽  
Capsule Endoscopy ◽  
Diagnostic Yield ◽  
Deficiency Anemia ◽  
Gi Tract ◽  
Upper Gi ◽  
Upper Gi Tract ◽  
Magnetically Assisted

Abstract Background Small-bowel capsule endoscopy is advocated and repeat upper gastrointestinal (GI) endoscopy should be considered for evaluation of recurrent or refractory iron deficiency anemia (IDA). A new device that allows magnetic steering of the capsule around the stomach (magnetically assisted capsule endoscopy [MACE]), followed by passive small-bowel examination might satisfy both requirements in a single procedure. Methods In this prospective cohort study, MACE and esophagogastroduodenoscopy (EGD) were performed in patients with recurrent or refractory IDA. Comparisons of total (upper GI and small bowel) and upper GI diagnostic yields, gastric mucosal visibility, and patient comfort scores were the primary end points. Results 49 patients were recruited (median age 64 years; 39 % male). Combined upper and small-bowel examination using the new capsule yielded more pathology than EGD alone (113 vs. 52; P < 0.001). In upper GI examination (proximal to the second part of the duodenum, D2), MACE identified more total lesions than EGD (88 vs. 52; P < 0.001). There was also a difference if only IDA-associated lesions (esophagitis, altered/fresh blood, angioectasia, ulcers, and villous atrophy) were included (20 vs. 10; P = 0.04). Pathology distal to D2 was identified in 17 patients (34.7 %). Median scores (0 – 10 for none – extreme) for pain (0 vs. 2), discomfort (0 vs. 3), and distress (0 vs. 4) were lower for MACE than for EGD (P < 0.001). Conclusion Combined examination of the upper GI tract and small bowel using the MACE capsule detected more pathology than EGD alone in patients with recurrent or refractory IDA. MACE also had a higher diagnostic yield than EGD in the upper GI tract and was better tolerated by patients.

scholarly journals A Prototype Therapeutic Capsule Endoscope for Ultrasound-Mediated Targeted Drug Delivery

2018 ◽  
Vol 03 (02) ◽  
pp. 1840001 ◽  
Author(s):  
Fraser Stewart ◽  
Antonella Verbeni ◽  
Yongqiang Qiu ◽  
Ben F. Cox ◽  
Jan Vorstius ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Crohn’S Disease ◽  
Side Effects ◽  
Capsule Endoscopy ◽  
Targeted Drug Delivery ◽  
Capsule Endoscope ◽  
Proof Of Concept ◽  
Gi Tract ◽  
Preliminary Results ◽  
Targeted Drug

The prevalence of gastrointestinal (GI) diseases such as Crohn’s disease, which is chronic and incurable, are increasing worldwide. Treatment often involves potent drugs with unwanted side effects. The technological–pharmacological combination of capsule endoscopy with ultrasound-mediated targeted drug delivery (UmTDD) described in this paper carries new potential for treatment of these diseases throughout the GI tract. We describe a proof-of-concept UmTDD capsule and present preliminary results to demonstrate its promise as an autonomous tool to treat GI diseases.

scholarly journals 3D reconstruction of small bowel lesions using stereo camera-based capsule endoscopy

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Seung-Joo Nam ◽  
Yun Jeong Lim ◽  
Ji Hyung Nam ◽  
Hyun Seok Lee ◽  
Youngbae Hwang ◽  
...  
Keyword(s):  
Small Bowel ◽  
3D Reconstruction ◽  
Capsule Endoscopy ◽  
Stereo Camera

Mo1553 Optimising the Performance of Magnetic Assisted Capsule Endoscopy (MACE) of the Upper GI Tract Using 3D - CT Modelling

2014 ◽  
Vol 79 (5) ◽  
pp. AB481
Author(s):  
Imdadur Rahman ◽  
Michael Kay ◽  
Stavroula Pelitari ◽  
Shaun Salter ◽  
Praful Patel ◽  
...  
Keyword(s):  
Capsule Endoscopy ◽  
3D Ct ◽  
Gi Tract ◽  
Upper Gi ◽  
Upper Gi Tract

scholarly journals Novel experimental and software methods for image reconstruction and localization in capsule endoscopy

2018 ◽  
Vol 06 (02) ◽  
pp. E205-E210 ◽  
Author(s):  
Anastasios Koulaouzidis ◽  
Dimitris Iakovidis ◽  
Diana Yung ◽  
Evangelos Mazomenos ◽  
Federico Bianchi ◽  
...  
Keyword(s):  
3D Reconstruction ◽  
Capsule Endoscopy ◽  
Visual Information ◽  
Estimation Algorithm ◽  
Absolute Error ◽  
Cylindrical Shape ◽  
Surface Geometry ◽  
Video Frames ◽  
Reconstruction Methods ◽  
Technological Limitations

Abstract Background and study aims Capsule endoscopy (CE) is invaluable for minimally invasive endoscopy of the gastrointestinal tract; however, several technological limitations remain including lack of reliable lesion localization. We present an approach to 3D reconstruction and localization using visual information from 2D CE images. Patients and methods Colored thumbtacks were secured in rows to the internal wall of a LifeLike bowel model. A PillCam SB3 was calibrated and navigated linearly through the lumen by a high-precision robotic arm. The motion estimation algorithm used data (light falling on the object, fraction of reflected light and surface geometry) from 2D CE images in the video sequence to achieve 3D reconstruction of the bowel model at various frames. The ORB-SLAM technique was used for 3D reconstruction and CE localization within the reconstructed model. This algorithm compared pairs of points between images for reconstruction and localization. Results As the capsule moved through the model bowel 42 to 66 video frames were obtained per pass. Mean absolute error in the estimated distance travelled by the CE was 4.1 ± 3.9 cm. Our algorithm was able to reconstruct the cylindrical shape of the model bowel with details of the attached thumbtacks. ORB-SLAM successfully reconstructed the bowel wall from simultaneous frames of the CE video. The “track” in the reconstruction corresponded well with the linear forwards-backwards movement of the capsule through the model lumen. Conclusion The reconstruction methods, detailed above, were able to achieve good quality reconstruction of the bowel model and localization of the capsule trajectory using information from the CE video and images alone.

ADAPTED BIT-PLANE PROBABILITY AND WAVELET-BASED ULCER DETECTION IN WIRELESS CAPSULE ENDOSCOPY IMAGES

2016 ◽  
Vol 28 (04) ◽  
pp. 1650029 ◽  
Author(s):  
Pedram Salehpour ◽  
Hossein Balazadeh Bahar ◽  
Ghader Karimian ◽  
Hossein Ebrahimnezhad
Keyword(s):  
Capsule Endoscopy ◽  
Computational Algorithm ◽  
Research Work ◽  
Wireless Capsule Endoscopy ◽  
Experimental Results ◽  
Gi Tract ◽  
Bit Plane ◽  
Bit Planes ◽  
Ulcer Detection ◽  
Wireless Capsule

Wireless capsule endoscopy (WCE) has been proven to be a robust technology which is able to ease diagnosing the GI tract diseases. It can be seen that a better computational algorithm is needed to analyze WCE images. Ulcer is one of the several diseases which are diagnosed using these images. Non-uniform lighting can complicate the detection process because it can change the color of tissue and make it seem darker or lighter than usual. This change of color makes the detection harder as the main feature of detecting ulcer as the color of the tissue. In this research work, adapted bit-planes are used to detect useful areas in images and then two sets of features, bit-plane probability and wavelet-based features, were extracted from the detected areas and used to classify them. Experimental results demonstrate a promising ground for further analysis of the channel-based bit-plane data and wavelet-based features.

Wireless Video-Capsule Endoscopy Is a More Sensitive Investigative Method Than Gastro-Intestinal Endoscopy and Biopsies for the Diagnosis of Acute GI-Gvhd.

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 1123-1123
Author(s):  
Jean-Baptiste Micol ◽  
Valerie Coiteux ◽  
Laurent Pascal ◽  
Louis Terriou ◽  
Christophe Willekens ◽  
...  
Keyword(s):  
Capsule Endoscopy ◽  
Positive Impact ◽  
Specific Treatment ◽  
Final Diagnosis ◽  
Response To Therapy ◽  
Video Capsule Endoscopy ◽  
High Morbidity ◽  
Gi Tract ◽  
Wireless Video ◽  
Post Transplant

Abstract Acute gastro-intestinal graft-versus-host disease (GI-GVHD) is a major complication following allogeneic stem cell transplantation (allo-SCT) and results in high morbidity and mortality. Diagnosis of GI-GVHD is problematic due a lack of specific symptoms and confounding variables in allo-SCT patients. Although diarrhea is the most common (but non-specific) presenting symptom in acute GI-GVHD, diagnosis is especially difficult when the diarrheal disorder is atypical (i.e. when there is no or limited skin involvement). In a previous study, we reported the positive impact of wireless video-capsule endoscopy (VCE) in the diagnosis of post-transplant diarrhea. Here, we report our experience over the last 5 years with an overall diagnostic approach (including VCE) to the management of allo-SCT patients with suspected acute GI-GVHD. In addition to wireless VCE, patients with atypical post-transplant diarrhea underwent bacterial and viral investigations and upper and/or lower GI-tract endoscopy (plus biopsies, as appropriate). VCE images were scored according to standard endoscopic classification. The final diagnosis took account of the results of the investigation as a whole and the response to therapy. Between August 2002 and October 2007, 240 patients underwent allo-SCT. Thirty patients underwent 37 extensive investigations, with VCE being performed in the following situations: febrile and/or hemorrhagic diarrhea (n=17), isolated diarrhea (n=15), persistent diarrhea or relapse despite appropriate adjustment of immunosuppressive (IS) treatment (n=5). Median time between allo-SCT and VCE was 50 days (range: 19–197). The final diagnosis was acute GVHD (n=19), viral infection (n=6, with 5 CMVs and 1 HHV6s) and a combination of both in 3 cases. The result of our approach was negative in 9 cases (with a normal GI tract by VCE in 8 of them) who were ultimately diagnosed as having functional diarrhea and recovered without any specific treatment. We observed 5 (14%) VCE failures, either due to an absence of intestinal passage (n=3) or major GI hemorrhage (n=2). In the other cases, VCE results were concordant with the final diagnosis. It was noteworthy that VCE was superior to biopsies in some cases. Thus, while VCE demonstrated typical GI-GVHD lesions in 8 patients with histological proven GI-GVHD, VCE showed a normal GI tract (n=4) or GI-GVHD features in 8 other cases where the biopsies were uncertain (n=7) or non-contributive (n=1). The response to appropriate treatment was favorable in 20 cases but was unfavorable and required further therapeutic adjustment in 8 cases (7 GVHDs, 1 CMV). Five patients died of GVHD (n=3), HHV6 infection (n=1) or both (n=1). This study confirms that VCE is a more sensitive investigative method than GI-endoscopy and biopsies. This approach enhanced our ability to modulate IS treatments in patients suffering from atypical post-transplant diarrhea. With its apparently high predictive value, routine use of VCE could be of great interest, particularly with a view to avoiding unnecessary digestive biopsies.

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