Quantitative measurements in capsule endoscopy

Keuchel, Martin; Kurniawan, Niehls; Baltes, Peter; Bandorski, Dirk; Koulaouzidis, Anastasios

doi:10.1016/j.compbiomed.2015.07.016

Cited by 15 publications

(7 citation statements)

References 94 publications

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“…For this purpose, a specifically designed, non-imaging wireless motility capsule (SmartPill, Medtronic plc, Dublin, Ireland) has been developed. Data from sensors measuring pH, pressure, and temperature are transmitted wirelessly for up to 5 d allowing diagnosis of gastroparesis, and prolonged transit times in the small bowel, colon or combined disorders[24-27]. …”

Section: Vce In Patients With Motility Disordersmentioning

confidence: 99%

Contraindications for video capsule endoscopy

Bandorski¹,

Kurniawan²,

Baltes³

et al. 2016

WJG

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Video capsule endoscopy (VCE) has been applied in the last 15 years in an increasing field of applications. Although many contraindications have been put into perspective, some precautions still have to be considered. Known stenosis of the gastrointestinal tract is a clear contraindication for VCE unless surgery is already scheduled or at least has been considered as an optional treatment modality. In patients with a higher incidence of stenosis, as in an established diagnosis of Crohn’s disease, clinical signs of obstruction, prior radiation or surgical small bowel resection, a preceding test with the self-dissolving patency capsule can override this contraindication. Endoscopic placement of the capsule should be considered in patients with swallowing disorders to avoid aspiration. Esophageal or gastric motility disorders may require endoscopic capsule transport or application of prokinetics if the real-time viewer proofs delayed transit. In pregnant women, VCE should be restricted to urgent cases where diagnosis cannot be postponed after delivery, as data on safety are missing. There is theoretical and clinical evidence that patients with implanted cardiac devices such as a pacemaker, cardioverters or left heart assist devices, can safely undergo VCE in spite of still existing contraindication by manufacturers. Children from the age of 2 years have safely undergone VCE. Although video capsules are not proven safe with magnetic resonance imaging (MRI), first single cases of patients incidentally undergoing MRI with an incorporated capsule have been reported, showing susceptibility artifacts but no signs of clinical harm.

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Section: Vce In Patients With Motility Disordersmentioning

confidence: 99%

Contraindications for video capsule endoscopy

Bandorski¹,

Kurniawan²,

Baltes³

et al. 2016

WJG

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“…The Medtronic system recognises that the capsule does not pass at a uniform speed through the gut and additionally provides information on the speed of travel at any point, by measuring the degree of change between successive images (the progress indicator). Several systems provide a two-dimensional image of a linear route map of the travel path of a radiofrequency-emitting capsule by triangulating signals detected by external sensors attached to different fixed sites on the anterior abdominal wall (55). An interesting study using radiofrequency triangulation around the abdominal wall to provide three-dimensional localization showed an average spatial error of 13.26 cm 3 when compared with plain radiography (anteroposterior and lateral abdominal radiographs) (56).…”

Section: Ce Reading Softwarementioning

confidence: 99%

Capsule endoscopy of the small bowel

McAlindon¹,

Ching²,

Yung³

et al. 2016

Ann. Transl. Med.

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Capsule endoscopy (CE) is a first line small bowel investigative modality which provides more sensitive mucosal imaging than comparators. It is a non-invasive, non-irradiating tool well tolerated by patients. The risk of retention of the capsule can be minimised by ensuring luminal patency using the Agile patency device. Research continues into how to minimise missed pathology and variability in the identification of pathology or interpretation of images. The consensus is that bowel preparation using laxatives improves visibility and diagnostic yield. Research includes the development of image recognition software, both to eliminate sequentially identical images to improve viewing speed and to select or enhance images likely to represent pathology. However, careful reading by experienced capsule endoscopists remains the benchmark. This should be performed at a speed comfortable to the viewer, probably at a maximum of 15 frames per second. Some prior experience of endoscopy appears to be helpful for novice capsule endoscopists and formal training on a hands-on training course seems to improve pathology recognition, for novices and for those with CE experience.

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“…For bleeding detection, color histograms with region growing [11], bag-of-visual-words [12], color wavelet features [13], and chrominance moments [14] have been applied in experimental settings. These methods rely on a single or a couple of image feature descriptors and their performance varies greatly when tested on full video sequences and open access datasets [15] . For polyps and lesions, similar types of feature descriptors such as color and texture [16] with second and higher order statistical measures [17], and other feature descriptors such as salient pixels and image transformation were applied.…”

Section: Introductionmentioning

confidence: 99%

“…Similar works proposed by [19] reveals a capacity for up to 85% frame reduction without loss of informative frames. However, evaluation of similar approaches on larger datasets indicates that the accuracy for detection of the most representative frames is rather low (66%) [15]. Most recently [6] proposed video summarization via similar-inhibition dictionary selection.…”

Section: Introductionmentioning

confidence: 99%

Sparse Coded Handcrafted and Deep Features for Colon Capsule Video Summarization

Mohammed¹,

Yayilgan²,

Pedersen³

et al. 2017

2017 IEEE 30th International Symposium on Computer-Based Medical Systems (CBMS)

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Capsule endoscopy, which uses a wireless camera to take images of the digestive track, is emerging as an alternative to traditional wired colonoscopy. A single examination produces a sequence of approximately 50,000 frames. These sequences are manually reviewed, which is time consuming and typically takes about 45-90 minutes and requires the undivided concentration of the reviewer. In this paper, we propose a novel capsule video summarization framework using sparse coding and dictionary learning in feature space. Video frames are clustered into superframes based on power spectral density, and cluster representative frames are used for video summarization. Handcrafted and deep features that are extracted for representative frames are sparse coded using a learned dictionary. Sparse coded features are later used for training SVM classifier. The proposed method was compared with state-of-the-art methods based on sensitivity and specificity on the KID dataset. The achieved results show that our proposed framework provides robust capsule video summarization without losing informative segments.

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Quantitative measurements in capsule endoscopy

Cited by 15 publications

References 94 publications

Contraindications for video capsule endoscopy

Contraindications for video capsule endoscopy

Capsule endoscopy of the small bowel

Sparse Coded Handcrafted and Deep Features for Colon Capsule Video Summarization

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